CN106443185B - A kind of measurement method and device of the impedance of three-phase alternating current system - Google Patents
A kind of measurement method and device of the impedance of three-phase alternating current system Download PDFInfo
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Abstract
The embodiment of the invention provides a kind of measurement method of the impedance of three-phase alternating current system and devices, to solve in the measurement to three-phase alternating current system impedance due to introducing frequency measurement link, and there is delay in the detection of frequency, thus the problem of influencing the accuracy of impedance detection.This method comprises: the current disturbing source between the source module of three-phase alternating current system and the b phase of the boundary of load blocks and c phase is arranged in three-phase alternating current system output disturbance signal using control signal control；Control signal be swept-frequency signal as source signal x-axis component and the y-axis component and o axis component of the source signal be zero when, a phase component after the source signal under dqo coordinate system to be converted to the source signal under abc coordinate system；The impedance of three-phase alternating current system is determined according to y-axis electric current identical with the frequency of swept-frequency signal, d shaft voltage and the q shaft voltage of boundary；Wherein, when x-axis d axis, y-axis is q axis；When x-axis is q axis, y-axis is d axis.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of measurement method of the impedance of three-phase alternating current system and
Device.
Background technique
Power electronic technique increasingly gos deep into the production and process field of electric energy, and influence cannot increasingly be ignored.Power electronics
Current transformer and electric system interact, and some new risks are brought, wherein just there is stability problem.
Negative resistance character is presented in electronic power convertor with constant power load characteristic, input terminal, consequently, it is possible to
Lead to the unstable of system.Large-scale power grid can bear these negative resistance characters, however many small-sized electric system
But cannot, such as spacecraft, ship, hybrid electric vehicle and micro power network system.These small-sized systems are in industry and the people
Can be more more and more universal with field, this makes us allow for the safe operation for ensuring them by predicting and testing.
In engineering practice, along with the use to powerful device, the interconnection of electric power electronic module is also more and more
Occur in practical applications.When individual module works independently, operating condition is relatively easy, and the stability of module is also this
In the case of be designed.But after interconnecting, not there is only the influence between module and source and load, module phase is also existed simultaneously
Influence between mutually, there is a phenomenon where unstable in interconnection for this module stable when will lead to work independently originally.
For the stability problem of interacted system, impedance criterion takes the lead in being proposed out, and impedance criterion, which refers to, works as source module
Output impedance and load blocks input admittance product without departing from unit circle, whole system is exactly stable.From that time,
Much the stability criteria based on impedance is established.And above-mentioned criterion all relies on the accurate measurement of impedance.
The impedance measurement method of direct current system is the small signal disturbance by injecting different frequency to direct current system, is then surveyed
Amount is corresponding to the disturbance voltage and current of same frequency, and the impedance or admittance of required frequency range have just been obtained using processing.
However for an AC system, the operating point of system is time-varying, this is difficult to the method for small signal disturbance
It implements.But for the AC system of three-phase equilibrium, if converted by Parker (Park), system changeover is sat to rotation
Under mark, then each variable of the balance system is just at DC quantity, system has stable operating point, therefore, can copy
The experience of direct current system applies small signal disturbance around this operating point, to realize in the case where rotating dqo coordinate system to three-phase
The measurement of AC system impedance.
Currently, the meeting pull-in frequency detection in the measurement to three-phase alternating current system impedance, by obtaining net in real time
The swept frequency of network analyzer ensure that sufficiently to realize the combination of injection method and Network Analyzer between existing line
While using Network Analyzer function, and introduce the advantage that injection method between line only needs an external disturbing source.However, by
It is among variation in swept frequency, the detection of frequency has delay, this will affect the accuracy of impedance detection.
In conclusion frequency detecting link is introduced in the measurement to three-phase alternating current system impedance at present, and due to sweeping
Frequent rate is among variation, and the detection of frequency has delay, this will affect the accuracy of impedance detection.
Summary of the invention
The embodiment of the invention provides a kind of measurement method of the impedance of three-phase alternating current system and devices, to solve at present
Due to introducing frequency measurement link in the measurement to three-phase alternating current system impedance, swept frequency is in variation, and
There is delay in the detection of frequency, thus the problem of influencing the accuracy of impedance detection.
Based on the above issues, the measurement method of the impedance of a kind of three-phase alternating current system provided in an embodiment of the present invention, comprising:
Current disturbing source is controlled to the three-phase alternating current system output disturbance signal using control signal；The current disturbing
The source module of the three-phase alternating current system and the b phase and c of the boundary of the load blocks of the three-phase alternating current system is arranged in source
Between phase；The control signal is in swept-frequency signal as x-axis component of the source signal under dqo coordinate system and the source signal
When y-axis component and o axis component under dqo coordinate system are zero, the source signal under dqo coordinate system is converted into abc coordinate system
Under source signal after a phase component；
It is true according to the y-axis electric current identical with the frequency of the swept-frequency signal, d shaft voltage and q shaft voltage of the boundary
Component in the impedance of the fixed three-phase alternating current system；
Wherein, when x-axis is the d axis in dqo coordinate system, y-axis is the q axis in dqo coordinate system；When x-axis is dqo coordinate system
In q axis when, y-axis be dqo coordinate system in d axis.
A kind of measuring device of the impedance of three-phase alternating current system provided in an embodiment of the present invention, comprising:
Control module, for being believed using control signal control current disturbing source to the three-phase alternating current system output disturbance
Number；The source module of the three-phase alternating current system and the load blocks of the three-phase alternating current system are arranged in the current disturbing source
Between the b phase and c phase of boundary；The control signal is the x-axis point in swept-frequency signal as source signal under dqo coordinate system
Amount and y-axis component and o axis component of the source signal under dqo coordinate system are when being zero, by the source signal under dqo coordinate system
A phase component after being converted to the source signal under abc coordinate system；
Determining module, for y-axis electric current identical with the frequency of the swept-frequency signal, the d axis electricity according to the boundary
Pressure and q shaft voltage determine the component in the impedance of the three-phase alternating current system；
Wherein, when x-axis is the d axis in dqo coordinate system, y-axis is the q axis in dqo coordinate system；When x-axis and dqo coordinate system
In q axis when, y-axis be dqo coordinate system in d axis.
The beneficial effect of the embodiment of the present invention includes:
The measurement method and device of the impedance of three-phase alternating current system provided in an embodiment of the present invention, using control signal control
Current disturbing source between the source module of three-phase alternating current system and the b phase and c phase of the boundary of load blocks is set to three-phase
AC system output disturbance signal, wherein control signal is the x-axis point in swept-frequency signal as source signal under dqo coordinate system
Amount and y-axis component and o axis component of the source signal under dqo coordinate system are when being zero, by the source signal under dqo coordinate system
A phase component after being converted to the source signal under abc coordinate system；Then according to the identical as the frequency of the swept-frequency signal of boundary
Y-axis electric current, d shaft voltage and q shaft voltage determine the component in the impedance of the three-phase alternating current system；Wherein, when x-axis is dqo
When d axis in coordinate system, y-axis is the q axis in dqo coordinate system；When the q axis in x-axis and dqo coordinate system, y-axis is dqo coordinate
D axis in system.Therefore, when the frequency shift of swept-frequency signal, the frequency of the disturbance of current disturbing source output is also changing, finally
Component in the impedance of the three-phase alternating current system determined according to d shaft voltage, q shaft voltage and y-axis electric current is that three-phase alternating current system exists
Frequency be equal to swept-frequency signal frequency when impedance component, that is to say, that pass through change swept-frequency signal frequency, so that it may survey
Measure impedance of the three-phase alternating current system in different frequency.Therefore, the impedance of three-phase alternating current system provided in an embodiment of the present invention
Measurement method does not need pull-in frequency measurement links, therefore, avoids the impedance inspection existed caused by delay frequency detecting
The true problem of indeterminacy.
Detailed description of the invention
Fig. 1 is one of the flow chart of measurement method of impedance of three-phase alternating current system provided in an embodiment of the present invention；
Fig. 2 is the two of the flow chart of the measurement method of the impedance of three-phase alternating current system provided in an embodiment of the present invention；
Fig. 3 is the reality when measurement method of the impedance of three-phase alternating current system provided in an embodiment of the present invention is applied in practice
Body block diagram；
Fig. 4 is the structural schematic diagram of LRC network；
Fig. 5 a~Fig. 5 d is to measure Fig. 4 using the measurement method of the impedance of three-phase alternating current system provided in an embodiment of the present invention
Shown in LRC network impedance when the obtained amplitude curve varying with frequency of each component and phase it is varying with frequency
Curve；
Fig. 6 is the structure chart of the measuring device of the impedance of three-phase alternating current system provided in an embodiment of the present invention.
Specific embodiment
The measurement method and device of a kind of impedance of three-phase alternating current system provided in an embodiment of the present invention, using control signal
Control be arranged in current disturbing source between the source module of three-phase alternating current system and the b phase of the boundary of load blocks and c phase to
Three-phase alternating current system output disturbance signal, wherein control signal is the x in swept-frequency signal as source signal under dqo coordinate system
When the y-axis component and o axis component of axis component and the source signal under dqo coordinate system are zero, by the source under dqo coordinate system
Signal is converted to a phase component after the source signal under abc coordinate system,；Then according to the boundary that detects and the frequency sweep
The identical y-axis electric current of the frequency of signal, d shaft voltage and q shaft voltage determine the component in the impedance of the three-phase alternating current system, from
And can be by the frequency of change swept-frequency signal, come the impedance of three-phase alternating current system when determining different frequency, this method is not needed
Therefore pull-in frequency measurement links avoid and there is a problem of the impedance detection inaccuracy caused by delay frequency detecting.
With reference to the accompanying drawings of the specification, to a kind of measurement side of the impedance of three-phase alternating current system provided in an embodiment of the present invention
Method and the specific embodiment of device are illustrated.
A kind of measurement method of the impedance of three-phase alternating current system provided in an embodiment of the present invention, as shown in Figure 1, comprising:
S101, current disturbing source is controlled to the three-phase alternating current system output disturbance signal using control signal；The electricity
The b of the boundary of the source module of the three-phase alternating current system and the load blocks of the three-phase alternating current system is arranged in flow disturbance source
Mutually between c phase；The control signal is in swept-frequency signal as x-axis component of the source signal under dqo coordinate system and the source
When y-axis component and o axis component of the signal under dqo coordinate system are zero, the source signal under dqo coordinate system is converted into abc and is sat
The a phase component after source signal under mark system；
S102, according to the y-axis electric current identical with the frequency of the swept-frequency signal of the boundary, d shaft voltage and q axis electricity
Pressure determines the component in the impedance of the three-phase alternating current system；
Wherein, when x-axis is the d axis in dqo coordinate system, y-axis is the q axis in dqo coordinate system；When x-axis is dqo coordinate system
In q axis when, y-axis be dqo coordinate system in d axis.
Can three-phase alternating current system be divided into two parts according to work independently: source module and load blocks, wherein can be independent
The part of work is source module, and the part that cannot be worked independently is load blocks.
That is, in S101, if control signal is the d axis in swept-frequency signal as source signal under dqo coordinate system
When the q axis component and o axis component of component and the source signal under dqo coordinate system are zero, the source under dqo coordinate system is believed
A phase component after number being converted to the source signal under abc coordinate system；Then in S102 in the impedance of available three-phase alternating current system
ZdqAnd Zqq, wherein Zdq=vd/iq, Zqq=vq/iq, wherein vdFor the source module of three-phase alternating current system and point of load blocks
D shaft voltage identical with the frequency of swept-frequency signal at boundary, vqFor the source module of three-phase alternating current system and the boundary of load blocks
The q shaft voltage identical with the frequency of swept-frequency signal at place, iqFor the source module of three-phase alternating current system and the boundary of load blocks
Q shaft current identical with the frequency of swept-frequency signal.
In S101, if control signal is in swept-frequency signal as q axis component of the source signal under dqo coordinate system and institute
When stating d axis component and o axis component of the source signal under dqo coordinate system and being zero, the source signal under dqo coordinate system is converted to
A phase component after source signal under abc coordinate system；The then Z in S102 in the impedance of available three-phase alternating current systemddWith
Zqd, wherein Zdd=vd/id, Zqd=vq/id, wherein idFor the boundary of the source module and load blocks of three-phase alternating current system
D shaft current identical with the frequency of swept-frequency signal.
That is, if to obtain all components in the impedance of three-phase alternating current system, i.e. Zdq、Zqq、ZddAnd Zqd,
Just have to carry out S101~S102 twice.
If execute S101~S102 for the first time, it is arranged between the b phase of the boundary of source module and load blocks and c phase
The waveform of disturbing signal that is injected to three-phase alternating current system of current disturbing source are as follows:
When second of execution S101~S105, it is arranged between the b phase of the boundary of source module and load blocks and c phase
The waveform for the disturbing signal that current disturbing source is injected to three-phase alternating current system are as follows:
Wherein, iinj_1The disturbance letter that current disturbing source is injected to three-phase alternating current system when to execute S101~S105 for the first time
Number, iinj_2The disturbing signal that current disturbing source is injected to three-phase alternating current system when executing S101~S105 for second, ωsTo sweep
The frequency of frequency signal, ωeFor the working frequency of three-phase alternating current system, i.e. power frequency 50Hz, ImFor the amplitude of the disturbing signal of injection,
θsFor the initial phase angle of swept-frequency signal.
If d axis component of the source signal under dqo coordinate system is that frequency is ωsSwept-frequency signal and the source signal in dqo
Q axis component and o axis component under coordinate system are zero, and control signal is the component of a phase of the source signal under abc coordinate system, then
Under dqo coordinate system, the frequency content of d shaft current injection is respectively ωs-2ωeAnd ωs+2ωe, the injection of q shaft current
Frequency content is ωs、ωs-2ωeAnd ωs+2ωe.And by disturbing signal iinj_1When transforming under dqo coordinate system, it can be seen that
Only q axis exists with swept-frequency signal with the signal of frequency, that is to say, that when d axis component of the source signal under dqo coordinate system is frequency
For ωsQ axis component and o axis component under dqo coordinate system of swept-frequency signal and source signal when being zero, only q axis
Exist with swept-frequency signal in electric current with the signal of frequency.
Similarly, it is ω that the q axis component when source signal under dqo coordinate system, which is frequency,sSwept-frequency signal and the source signal
When d axis component and o axis component under dqo coordinate system are zero, exist with swept-frequency signal only in the electric current of d axis with the letter of frequency
Number.
Further, the impedance of three-phase alternating current system provided in an embodiment of the present invention measurement method as shown in Fig. 2, its
In, S102 is specifically included:
S201, a phase current of the detection boundary, b phase current, c phase current, a phase voltage, b phase voltage and c phase electricity
Pressure；
S202, a phase current that will test, b phase current, c phase current pass through the conversion of abc coordinate system to dqo coordinate system,
Obtain the y-axis electric current of multi-frequency ingredient mixing；
S203, a phase voltage that will test, b phase voltage, c phase voltage pass through the conversion of abc coordinate system to dqo coordinate system,
Obtain the d shaft voltage of multi-frequency ingredient mixing and the q shaft voltage of multi-frequency ingredient mixing；
S204, y-axis electricity identical with the frequency of the swept-frequency signal in the y-axis electric current of the multi-frequency ingredient mixing is determined
Stream, and d shaft voltage identical with the frequency swept signal in the d shaft voltage of the determining multi-frequency ingredient mixing, and really
Q shaft voltage identical with the frequency of the swept-frequency signal in the q shaft voltage of the fixed multi-frequency ingredient mixing；
S205, using the ratio of determining d shaft voltage identical with the frequency of the swept-frequency signal and y-axis electric current as described in
A part of component in the impedance of three-phase alternating current system；And by determining q shaft voltage identical with the frequency of the swept-frequency signal
Ratio with y-axis electric current is as remaining component in the impedance of the three-phase alternating current system.
Wherein, there is no temporal sequencing between S202 and S203, S202 can be first carried out, execute S203 afterwards,
S203 can be first carried out, executes S202 afterwards；Also S202 and S203 be may be performed simultaneously, in practice, usually pass through digital processing
Device is performed simultaneously S202 and S203.
In S205, when y-axis is d axis, by determining d shaft voltage identical with the frequency of the swept-frequency signal and y-axis
The ratio of electric current is as the Z in the impedance of the three-phase alternating current systemdd, will be determining identical with the frequency of the swept-frequency signal
The ratio of q shaft voltage and y-axis electric current is as the Z in the impedance of the three-phase alternating current systemqd；It, will be determining when y-axis is q axis
In impedance of the ratio of d shaft voltage identical with the frequency of the swept-frequency signal and y-axis electric current as the three-phase alternating current system
Zdq, using the ratio of determining q shaft voltage identical with the frequency of the swept-frequency signal and y-axis electric current as the three-phase alternating current
Z in the impedance of systemqq。
As the d shaft voltage v of the multi-frequency ingredient mixing obtained after abc coordinate system to the conversion of dqo coordinate systemd, it is more
The q shaft voltage v of frequency content mixingq, multi-frequency ingredient mixing d shaft current idWith the q shaft current i of multi-frequency ingredient mixingqIt is defeated
When entering to the input terminal of Network Analyzer, the measurement method of the impedance of three-phase alternating current system provided in an embodiment of the present invention is applied
Entity block diagram when in practice, as shown in Figure 3.
In Fig. 3, the source module of three-phase alternating current system is power grid 36, and load blocks are load 37, power grid 36 and load 37
Between by impedance Z connect, Network Analyzer 31 export swept-frequency signal v_sweep, swept-frequency signal v_sweep is as source signal
X-axis component, the y-axis component and o axis component of source signal are 0, and when x-axis is d axis, y-axis is q axis, when x-axis is q axis, y-axis
For d axis.Source signal in dqo coordinate system is transformed under abc coordinate system by the first conversion module 32, the source under abc coordinate system
A axis component in signal controls current disturbing source 33 as control signal V_control in the boundary of power grid 36 and load 37
Disturbing signal is injected to three-phase alternating current system between the b phase and c phase at place.
Dqo is transformed by the second conversion module 342 in a phase voltage, b phase voltage and the c phase voltage that boundary detects
In coordinate system, d shaft voltage and q shaft voltage are obtained, wherein obtained d shaft voltage and q shaft voltage is multiple frequency content mixing
Voltage afterwards；Dqo is transformed by third conversion module 341 in a phase current, b phase current and the c phase current that boundary detects
In coordinate system, d shaft current and q shaft current are obtained, wherein obtained d shaft current and q shaft current is multiple frequency content mixing
Electric current.
Multiplexer circuit 35 is defeated from d shaft voltage and q the shaft voltage selection one received according to selection signal Index
Enter the measurement terminal Vy to the input terminal of Network Analyzer 31, and selection one is defeated from the d shaft current and q shaft current received
Enter the reference terminal Vx to the input terminal of Network Analyzer 31, the narrow-band tracking characteristic of Network Analyzer 31 can be by measurement terminal
Constituents extraction in the signal that Vy is received with swept-frequency signal v_sweep same frequency comes out, and reference terminal Vx is received
Constituents extraction in signal with swept-frequency signal v_sweep same frequency comes out, and then measures in the signal that measurement terminal Vy is received
With swept-frequency signal v_sweep with frequency in the signal received with the ingredient and reference terminal Vx of swept-frequency signal v_sweep same frequency
The amplitude and phase of the ratio of the ingredient of rate and output, that is, show result Vy/Vx.
Since the component of the impedance of three-phase alternating current system has 4 Zdd、Zdq、ZqdAnd Zqq, and Network Analyzer is in one-shot measurement
It is only capable of measuring the one-component of the impedance of three-phase alternating current system in the process, therefore, to measure the institute of the impedance of three-phase alternating current system
It is important, it is necessary to carry out 4 measurements.
When measuring using block diagram shown in Fig. 3 to the impedance of three-phase alternating current system, following process can be used:
1) during first time frequency sweep, to the disturbing signal i of three-phase alternating current system injectioninj_1, Network Analyzer 31 is defeated
D axis component of the swept-frequency signal v_sweep out as source signal, the q axis component and o axis component of source signal are 0, multi-path choice
Q shaft current is input to the reference terminal Vx in the input terminal of Network Analyzer 31 by signal index control multiplexer circuit 35,
And d shaft voltage is input in the input terminal of Network Analyzer 31 by multi-path choice signal index control multiplexer circuit 35
Measurement terminal Vy, in the signal that Network Analyzer 31 receives measurement terminal Vy with swept-frequency signal v_sweep same frequency
Constituents extraction comes out, and the constituents extraction in signal that reference terminal Vx is received with swept-frequency signal v_sweep same frequency is gone out
Come, the ingredient and reference terminal Vx in the signal that then measurement measurement terminal Vy is received with swept-frequency signal v_sweep same frequency
With the amplitude and phase of the ratio of the ingredient of swept-frequency signal v_sweep same frequency and output in the signal received, that is, show knot
Thus fruit Vy/Vx obtains the component Z of the impedance of three-phase alternating current systemdq。
2) multi-path choice signal index controls multiplexer circuit 35 and q shaft voltage is input to the defeated of Network Analyzer 31
Enter the measurement terminal Vy in end, by point of the impedance of the available three-phase alternating current system of narrow-band tracking characteristic of Network Analyzer 31
Measure Zqq。
3) during second of frequency sweep, to the disturbing signal i of three-phase alternating current system injectioninj_2, Network Analyzer 31 is defeated
Q axis component of the swept-frequency signal v_sweep out as source signal, the d axis component and o axis component of source signal are 0, multi-path choice
D shaft current is input to the reference terminal Vx in the input terminal of Network Analyzer 31 by signal index control multiplexer circuit 35,
And d shaft voltage is input in the input terminal of Network Analyzer 31 by multi-path choice signal index control multiplexer circuit 35
Measurement terminal Vy, by the component Z of the impedance of the available three-phase alternating current system of narrow-band tracking characteristic of Network Analyzer 31dd。
4) multi-path choice signal index controls multiplexer circuit 35 and q shaft voltage is input to the defeated of Network Analyzer 31
Enter the measurement terminal Vy in end, by point of the impedance of the available three-phase alternating current system of narrow-band tracking characteristic of Network Analyzer 31
Measure Zqd。
Since swept-frequency signal v_sweep is exported by Network Analyzer, and each component of the impedance of three-phase alternating current system
It can be exported by Network Analyzer, an external current disturbing source is only needed in measurement process, therefore, measuring table can be with
Obtain very big simplification.
Using three-phase alternating current system provided in an embodiment of the present invention impedance measurement method to LRC net shown in Fig. 4
When the impedance of network measures, it is assumed that C=9mF, L=10mH, R=1 Ω in LRC network shown in Fig. 4.
The impedance component Z of three-phase alternating current system is given in Fig. 5 addThe curve that changes with frequency f (Hz) of amplitude (dB)
The curve (following figure) that (above) and phase (deg) change with frequency f (Hz), wherein solid line is to be mentioned using the embodiment of the present invention
It is that the measurement method of the impedance of the three-phase alternating current system of confession is emulated as a result, dotted line be theoretical calculation result.
The impedance component Z of three-phase alternating current system is given in Fig. 5 bdqThe curve that changes with frequency f (Hz) of amplitude (dB)
The curve (following figure) that (above) and phase (deg) change with frequency f (Hz), wherein solid line is to be mentioned using the embodiment of the present invention
It is that the measurement method of the impedance of the three-phase alternating current system of confession is emulated as a result, dotted line be theoretical calculation result.
The impedance component Z of three-phase alternating current system is given in Fig. 5 cqdThe curve that changes with frequency f (Hz) of amplitude (dB)
The curve (following figure) that (above) and phase (deg) change with frequency f (Hz), wherein solid line is to be mentioned using the embodiment of the present invention
It is that the measurement method of the impedance of the three-phase alternating current system of confession is emulated as a result, dotted line be theoretical calculation result.
The impedance component Z of three-phase alternating current system is given in Fig. 5 dqqThe curve that changes with frequency f (Hz) of amplitude (dB)
The curve (following figure) that (above) and phase (deg) change with frequency f (Hz), wherein solid line is to be mentioned using the embodiment of the present invention
It is that the measurement method of the impedance of the three-phase alternating current system of confession is emulated as a result, dotted line be theoretical calculation result.
The measurement method for the impedance that can be seen that three-phase alternating current system provided in an embodiment of the present invention from Fig. 5 a~Fig. 5 d can
Correctly to measure the impedance of three-phase alternating current system, also, when the impedance of three-phase alternating current system provided in an embodiment of the present invention
When measurement method uses measuring table shown in Fig. 3, the generation (i.e. the generation of swept-frequency signal) and processing of signal (calculate three
Each component of the impedance of phase AC system) all completed by Network Analyzer, it is only necessary to an external disturbing source, therefore,
The structure of measuring table is simple.
Based on the same inventive concept, the embodiment of the invention also provides a kind of measurement of the impedance of three-phase alternating current system dresses
It sets, since the principle of the solved problem of the device is similar to the measurement method of the impedance of aforementioned three-phase alternating current system, the dress
The implementation set may refer to the implementation of preceding method, and overlaps will not be repeated.
The measuring device of the impedance of three-phase alternating current system provided in an embodiment of the present invention, as shown in Figure 6, comprising:
Control module 61, for being believed using control signal control current disturbing source to the three-phase alternating current system output disturbance
Number；The source module of the three-phase alternating current system and the load blocks of the three-phase alternating current system are arranged in the current disturbing source
Between the b phase and c phase of boundary；The control signal is the x-axis point in swept-frequency signal as source signal under dqo coordinate system
Amount and y-axis component and o axis component of the source signal under dqo coordinate system are when being zero, by the source signal under dqo coordinate system
A phase component after being converted to the source signal under abc coordinate system；
Determining module 62, for y-axis electric current identical with the frequency of the swept-frequency signal, the d axis according to the boundary
Voltage and q shaft voltage determine the component in the impedance of the three-phase alternating current system；
Wherein, when x-axis is the d axis in dqo coordinate system, y-axis is the q axis in dqo coordinate system；When x-axis and dqo coordinate system
In q axis when, y-axis be dqo coordinate system in d axis.
Optionally it is determined that module 62 is specifically used for: detecting a phase current, b phase current, c phase current, a phase of the boundary
Voltage, b phase voltage and c phase voltage；A phase current, b phase current, the c phase current that will test are sat by abc coordinate system to dqo
The conversion for marking system obtains the y-axis electric current of multi-frequency ingredient mixing；A phase voltage, b phase voltage, the c phase voltage that will test pass through
Abc coordinate system obtains the d shaft voltage of multi-frequency ingredient mixing and the q axis electricity of multi-frequency ingredient mixing to the conversion of dqo coordinate system
Pressure；It determines y-axis electric current identical with the frequency of the swept-frequency signal in the y-axis electric current of the multi-frequency ingredient mixing, and determines
D shaft voltage identical with the frequency swept signal in the d shaft voltage of the multi-frequency ingredient mixing, and determine the multifrequency
Q shaft voltage identical with the frequency of the swept-frequency signal in the q shaft voltage of rate ingredient mixing；By determining with the swept-frequency signal
The identical d shaft voltage of frequency and y-axis electric current ratio as a part of component in the impedance of the three-phase alternating current system；And
Using the ratio of determining q shaft voltage identical with the frequency of the swept-frequency signal and y-axis electric current as the three-phase alternating current system
Impedance in remaining component.
Optionally it is determined that module 62 is specifically used for: detecting a phase current, b phase current, c phase current, a phase of the boundary
Voltage, b phase voltage and c phase voltage；A phase current, b phase current, the c phase current that will test are sat by abc coordinate system to dqo
The conversion for marking system obtains the y-axis electric current of multi-frequency ingredient mixing；A phase voltage, b phase voltage, the c phase voltage that will test pass through
Abc coordinate system obtains the d shaft voltage of multi-frequency ingredient mixing and the q axis electricity of multi-frequency ingredient mixing to the conversion of dqo coordinate system
Pressure；Obtained d shaft voltage is input to the measurement terminal of the input terminal of Network Analyzer, and obtained y-axis electric current is input to
The reference terminal of the input terminal of the Network Analyzer；It is that the Network Analyzer is exported with swept-frequency signal frequency phase
The ratio of same d shaft voltage and y-axis electric current identical with the frequency of the swept-frequency signal, the resistance as the three-phase alternating current system
A part of component in anti-；Obtained q shaft voltage is input to the measurement terminal of the input terminal of Network Analyzer, and will obtain
Y-axis electric current is input to the reference terminal of the input terminal of the Network Analyzer；What the Network Analyzer was exported sweeps with described
The ratio of the frequency of frequency signal identical q shaft voltage and y-axis electric current identical with the frequency of the swept-frequency signal, as described three
Remaining component in the impedance of phase AC system.
Preferably, the swept-frequency signal is the signal of Network Analyzer output.
Through the above description of the embodiments, those skilled in the art can be understood that the embodiment of the present invention
The mode of necessary general hardware platform can also be added to realize by software by hardware realization.Based on such reason
Solution, the technical solution of the embodiment of the present invention can be embodied in the form of software products, which can store one
In a non-volatile memory medium (can be CD-ROM, USB flash disk, mobile hard disk etc.), including some instructions are used so that a meter
It calculates machine equipment (can be personal computer, server or the network equipment etc.) and executes side described in each embodiment of the present invention
Method.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, module or stream in attached drawing
Journey is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in embodiment can describe be divided according to embodiment
It is distributed in the device of embodiment, corresponding change can also be carried out and be located in one or more devices different from the present embodiment.On
The module for stating embodiment can be merged into a module, can also be further split into multiple submodule.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of measurement method of the impedance of three-phase alternating current system characterized by comprising
Current disturbing source is controlled to the three-phase alternating current system output disturbance signal using control signal；The current disturbing source is set
Set the source module of the three-phase alternating current system and the b phase of the boundary of the load blocks of the three-phase alternating current system and c phase it
Between；The control signal is in swept-frequency signal as x-axis component of the source signal under dqo coordinate system and the source signal is in dqo
When y-axis component and o axis component under coordinate system are zero, the source signal under dqo coordinate system is converted into the source under abc coordinate system
A phase component after signal；
Institute is determined according to y-axis electric current identical with the frequency of the swept-frequency signal, d shaft voltage and the q shaft voltage of the boundary
State the component in the impedance of three-phase alternating current system, wherein the d shaft voltage and the q shaft voltage with the swept-frequency signal
Frequency is identical；
Wherein, when x-axis is the d axis in dqo coordinate system, y-axis is the q axis in dqo coordinate system；When x-axis is in dqo coordinate system
When q axis, y-axis is the d axis in dqo coordinate system；
It is described true according to the y-axis electric current identical with the frequency of the swept-frequency signal, d shaft voltage and q shaft voltage of the boundary
Component in the impedance of the fixed three-phase alternating current system, comprising:
It is determined according to the ratio of the ratio and the q shaft voltage of the d shaft voltage and the y-axis electric current and the y-axis electric current
Component in the impedance of the three-phase alternating current system.
2. the method as described in claim 1, which is characterized in that according to the frequency with the swept-frequency signal of the determination boundary
The identical y-axis electric current of rate, d shaft voltage and q shaft voltage determine the component in the impedance of the three-phase alternating current system, specifically include:
Detect a phase current, b phase current, c phase current, a phase voltage, b phase voltage and the c phase voltage of the boundary；
A phase current, b phase current, the c phase current that will test pass through abc coordinate system to the conversion of dqo coordinate system, obtain multifrequency
The y-axis electric current of rate ingredient mixing；
A phase voltage, b phase voltage, the c phase voltage that will test pass through abc coordinate system to the conversion of dqo coordinate system, obtain multifrequency
The d shaft voltage of rate ingredient mixing and the q shaft voltage of multi-frequency ingredient mixing；
It determines y-axis electric current identical with the frequency of the swept-frequency signal in the y-axis electric current of the multi-frequency ingredient mixing, and determines
D shaft voltage identical with the frequency swept signal in the d shaft voltage of the multi-frequency ingredient mixing, and determine the multifrequency
Q shaft voltage identical with the frequency of the swept-frequency signal in the q shaft voltage of rate ingredient mixing；
Using the ratio of determining d shaft voltage identical with the frequency of the swept-frequency signal and y-axis electric current as the three-phase alternating current
A part of component in the impedance of system；And by determining q shaft voltage identical with the frequency of the swept-frequency signal and y-axis electric current
Ratio as remaining component in the impedance of the three-phase alternating current system.
3. the method as described in claim 1, which is characterized in that according to the frequency with the swept-frequency signal of the determination boundary
The identical y-axis electric current of rate, d shaft voltage and q shaft voltage determine the component in the impedance of the three-phase alternating current system, specifically include:
Detect a phase current, b phase current, c phase current, a phase voltage, b phase voltage and the c phase voltage of the boundary；
A phase current, b phase current, the c phase current that will test pass through abc coordinate system to the conversion of dqo coordinate system, obtain multifrequency
The y-axis electric current of rate ingredient mixing；
A phase voltage, b phase voltage, the c phase voltage that will test pass through abc coordinate system to the conversion of dqo coordinate system, obtain multifrequency
The d shaft voltage of rate ingredient mixing and the q shaft voltage of multi-frequency ingredient mixing；
Obtained d shaft voltage is input to the measurement terminal of the input terminal of Network Analyzer, and obtained y-axis electric current is input to
The reference terminal of the input terminal of the Network Analyzer；
D shaft voltage identical with the frequency of the swept-frequency signal that the Network Analyzer is exported and with the swept-frequency signal
The ratio of the identical y-axis electric current of frequency, as a part of component in the impedance of the three-phase alternating current system；
Obtained q shaft voltage is input to the measurement terminal of the input terminal of Network Analyzer, and obtained y-axis electric current is input to
The reference terminal of the input terminal of the Network Analyzer；
Q shaft voltage identical with the frequency of the swept-frequency signal that the Network Analyzer is exported and with the swept-frequency signal
The ratio of the identical y-axis electric current of frequency, as remaining component in the impedance of the three-phase alternating current system.
4. the method as described in claim 1, which is characterized in that the swept-frequency signal is the signal of Network Analyzer output.
5. a kind of measuring device of the impedance of three-phase alternating current system characterized by comprising
Control module, for controlling current disturbing source to the three-phase alternating current system output disturbance signal using control signal；Institute
State the boundary that the source module of the three-phase alternating current system and the load blocks of the three-phase alternating current system is arranged in current disturbing source
Between the b phase and c phase at place；The control signal be in swept-frequency signal as x-axis component of the source signal under dqo coordinate system and
When y-axis component and o axis component of the source signal under dqo coordinate system are zero, the source signal under dqo coordinate system is converted to
A phase component after source signal under abc coordinate system；
Determining module, for y-axis electric current identical with the frequency of the swept-frequency signal, d shaft voltage and the q according to the boundary
Shaft voltage determines the component in the impedance of the three-phase alternating current system, wherein the d shaft voltage and the q shaft voltage are and institute
The frequency for stating swept-frequency signal is identical；
Wherein, when x-axis is the d axis in dqo coordinate system, y-axis is the q axis in dqo coordinate system；When in x-axis and dqo coordinate system
When q axis, y-axis is the d axis in dqo coordinate system；
The determining module is specifically used for:
It is determined according to the ratio of the ratio and the q shaft voltage of the d shaft voltage and the y-axis electric current and the y-axis electric current
Component in the impedance of the three-phase alternating current system.
6. device as claimed in claim 5, which is characterized in that the determining module is specifically used for:
Detect a phase current, b phase current, c phase current, a phase voltage, b phase voltage and the c phase voltage of the boundary；It will test
A phase current, b phase current, the c phase current arrived passes through the conversion of abc coordinate system to dqo coordinate system, obtains the mixing of multi-frequency ingredient
Y-axis electric current；A phase voltage, b phase voltage, the c phase voltage that will test, to the conversion of dqo coordinate system, are obtained by abc coordinate system
The q shaft voltage of d shaft voltage and multi-frequency the ingredient mixing mixed to multi-frequency ingredient；Determine the y of the multi-frequency ingredient mixing
Y-axis electric current identical with the frequency of the swept-frequency signal in shaft current, and in the d shaft voltage of the determining multi-frequency ingredient mixing
It is swept in d shaft voltage identical with the frequency swept signal, and the q shaft voltage of the determining multi-frequency ingredient mixing with described
The identical q shaft voltage of the frequency of frequency signal；By determining d shaft voltage identical with the frequency of the swept-frequency signal and y-axis electric current
Ratio as a part of component in the impedance of the three-phase alternating current system；And by the determining frequency with the swept-frequency signal
The ratio of identical q shaft voltage and y-axis electric current is as remaining component in the impedance of the three-phase alternating current system.
7. device as claimed in claim 5, which is characterized in that the determining module is specifically used for:
Detect a phase current, b phase current, c phase current, a phase voltage, b phase voltage and the c phase voltage of the boundary；It will test
A phase current, b phase current, the c phase current arrived passes through the conversion of abc coordinate system to dqo coordinate system, obtains the mixing of multi-frequency ingredient
Y-axis electric current；A phase voltage, b phase voltage, the c phase voltage that will test, to the conversion of dqo coordinate system, are obtained by abc coordinate system
The q shaft voltage of d shaft voltage and multi-frequency the ingredient mixing mixed to multi-frequency ingredient；Obtained d shaft voltage is input to network
The measurement terminal of the input terminal of analyzer, and obtained y-axis electric current is input to the reference of the input terminal of the Network Analyzer
Terminal；D shaft voltage identical with the frequency of the swept-frequency signal that the Network Analyzer is exported and with the swept-frequency signal
The identical y-axis electric current of frequency ratio, as a part of component in the impedance of the three-phase alternating current system；The q that will be obtained
Shaft voltage is input to the measurement terminal of the input terminal of Network Analyzer, and obtained y-axis electric current is input to the network analysis
The reference terminal of the input terminal of instrument；The q shaft voltage identical with the frequency of the swept-frequency signal that the Network Analyzer is exported
With the ratio of y-axis electric current identical with the frequency of the swept-frequency signal, as remaining in the impedance of the three-phase alternating current system
Component.
8. device as claimed in claim 5, which is characterized in that the swept-frequency signal is the signal of Network Analyzer output.
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| CN108680792B (en) * | 2018-05-28 | 2020-06-05 | 国网内蒙古东部电力有限公司 | Dynamic admittance measuring method for new energy grid-connected system with power electronic device |
| CN109507482B (en) * | 2018-12-29 | 2021-08-24 | 西北工业大学 | Three-phase alternating current circuit impedance test system and method |
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