CN103281077A - Multi-band phase locking method and system based on cross coupling - Google Patents
Multi-band phase locking method and system based on cross coupling Download PDFInfo
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Abstract
The invention discloses a multi-band phase locking method and a multi-band phase locking system based on cross coupling. According to the method and the system, a plurality of phase-locked filtering units are adopted for respectively detecting a plurality of frequency components in the electric network voltage, for each phase-locked filtering unit, each frequency component obtained after the filtering processing of other phase-locked filtering unit are fed forward to the input of a phase-locked loop for counteracting the interference on the phase locking and the filtering of the phase-locked filtering units caused by other frequency components in the electric network voltage signals. Because the crossed forward feed effect inhibits the interference of other frequency components, the detection precision of each phase-locked filtering unit on the phase of the corresponding frequency component in the electric network voltage signals is improved, and meanwhile, the phase-locked loop band width in the phase-locked filtering unit can be properly improved, so the response speed of the phase detection of the phase-locked filtering unit is accelerated. The method has the advantages that the phase of positive and negative sequence fundamental wave and harmonic wave components in the electric network voltage can be fast and accurately extracted when the electric network voltage is asymmetrical and generates distortion, in addition, the reliable electric network voltage phase reference can be provided for the control of a grid-connected inverter.
Description
Technical field
The present invention relates to that electronic power convertor is incorporated into the power networks and the control technology field, more specifically, relate to a kind of based on cross-linked multiband phase-lock technique and system.
Background technology
Electronic power convertor is widely used in grid-connected power generation system and HVDC (High Voltage Direct Current) transmission system.The extensive development of generation of electricity by new energy makes electrical network have higher requirement to the electrical network friendly of generation of electricity by new energy.Under the condition of electric network fault, distortion, current transformer need keep being incorporated into the power networks and satisfy certain active power, reactive power output requirement.HVDC (High Voltage Direct Current) transmission system need keep high reliability in various running environment such as electric network fault, distortion.The control of current transformer is based on the line voltage orientation, and quick and precisely the detection of grid voltage-phase is that current transformer keeps controlled prerequisite when electric network fault or distortion.
Grid-connected converter generally uses software phase-lock loop detection of grid voltage-phase at present, and its structured flowchart as shown in Figure 1.Basic principle is: detection of grid voltage signal v
a, v
b, v
c, it is carried out the Park conversion under the phase-locked loop coordinate system, obtain q axle component v
qWith d axle component v
dv
qThe error that can reflect electric network voltage phase and phase-locked loop phasetophase.v
qVia controller is regulated the back and is formed frequency adjustment component Δ ω.Δ ω adds the initial given frequencies omega of phase-locked loop
0Form phase-locked loop frequency ω, ω forms the phase-locked loop phase theta behind integration.When phase-locked loop phase place and electric network voltage phase have error, phase-locked loop frequency and phase place will be regulated, and equate until both frequencies and phase place.Phase-locked loop output phase θ is as the detected value of electric network voltage phase.
When only containing fundamental positive sequence in the line voltage, phase-locked loop is the detection of grid voltage-phase quick and precisely.When containing negative phase-sequence and harmonic component in the line voltage, v
qIn alternating current component will appear, controller can't suppress the interference of this alternating current component fully, makes the accurately phase place of detection of grid voltage fundamental positive sequence component of phase-locked loop.
At present, generally adopt the method that reduces the controller bandwidth to suppress the interference of negative phase-sequence and harmonic component on the engineering.The dynamic responding speed of phase-locked loop yet the method has slowed down is unfavorable for effective control of current transformer.On the other hand, in some cases, current transformer needs control negative phase-sequence even harmonic current, and this needs phase-locked loop can extract the phase information of line voltage negative phase-sequence and harmonic component.Phase-locked loop commonly used at present can't satisfy this requirement.
Summary of the invention
At the defective of prior art, the invention provides a kind ofly based on cross-linked multiband phase-lock technique, be intended to solve existing phase-locked loop can't quick and precisely extract electric network voltage phase information under unbalanced source voltage and distortion situation problem.
The invention provides a kind ofly based on cross-linked multiband phase-lock technique, comprise the steps:
N second input signal respectively through N the phase-locked and filtering processing of phase-locked filter unit, obtained N phase signal and N filtering signal;
To each phase-locked filter unit, with the filtering signal addition of other N-1 phase-locked filter unit output, obtain the feed-forward signal of this phase-locked filter unit, obtain N feed-forward signal altogether;
First input signal is deducted N feed-forward signal respectively, obtain N described second input signal;
Described first input signal is the line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is smaller or equal to the number of the described first input signal medium frequency component.
Further, described phase-locked filter unit obtains phase signal by phase-locked loop; Described N phase-locked filter unit is by arranging the rated frequency that the initial given frequency of phase-locked loop is respectively N frequency component in first input signal, makes each phase-locked filter unit detect the component that rated frequency in first input signal equals the initial given frequency of phase-locked loop respectively; With N phase signal of the phase-locked filter unit output of N and N filtering signal respectively as the phase place of corresponding frequencies component in first input signal and the detected value of time-domain signal.
Further, a kind of method of obtaining described filtering signal is specially:
(1) with described second input signal after the Park conversion under the phase-locked loop coordinate system, obtain d axle component and q axle component; (2) described d axle component and described q axle component are carried out low-pass filtering respectively after, carry out the Park inverse transformation again and obtain described filtering signal.
Further, the another kind of method of obtaining described filtering signal is specially:
(1) error signal gets after the Park conversion under the phase-locked loop coordinate system, to d axle component and q axle component; (2) described d axle component and described q axle component are carried out integration respectively after, carry out the Park inverse transformation again and obtain described filtering signal; (3) described second input signal deducts described filtering signal, obtains described error signal.
In the present invention, by the rated frequency that the initial given frequency of phase-locked loop in N the phase-locked filter unit is respectively N frequency component in the mains voltage signal is set, make each phase-locked filter unit respectively in the detection of grid voltage signal rated frequency equal the component of the initial given frequency of phase-locked loop.In the acquisition methods of filtering signal, because low pass filter or integral feedback are to the attenuation of high fdrequency component, and Park conversion and inverse transformation are to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters is handled, the corresponding frequency component of the frequency component that detects with phase-locked filter unit in the input signal of phase-locked filter unit keeps, other frequency component decay.To each phase-locked filter unit, be fed forward to the input of this phase-locked loop by the filtering signal with other N-1 phase-locked filter unit output, offset in the mains voltage signal other N-1 frequency component to the interference of the phase-locked filtering of this phase-locked filter unit, thereby improve each phase-locked filter unit to the accuracy of detection of corresponding frequencies component phase in the mains voltage signal.Simultaneously, because the interference reduction in the input signal, the pll controller bandwidth can suitably improve in the phase-locked filter unit, thereby improves the response speed of phase-detection.Especially, when each frequency component all arranged the phase-locked filter unit of corresponding frequencies in the mains voltage signal, during stable state, each phase-locked filter unit can be distinguished the phase place of corresponding frequencies component in the error free detection of grid voltage signal.In the practical application, by the phase-locked filter unit of the component corresponding frequencies that content is big relatively in the line voltage is set, each phase-locked loop accuracy of detection is met the demands.The method can suppress negative sequence component fully and suppress the harmonic component influence phase-locked to positive sequence component largely, and can extract the phase place of positive and negative order first-harmonic and harmonic component in the line voltage, simultaneously response speed is fast, for the control of grid-connected converter provides reliable electric network voltage phase benchmark.
The present invention also provides a kind of system that realizes above-mentioned multiband phase-lock technique, comprises N first subtracter, a N phase-locked filter unit and N first adder; The first input end of each subtracter connects first input signal, second input of each subtracter connects the output of an adder, the output of each subtracter connects the input of a phase-locked filter unit, and subtracter is used for that first input signal is deducted feed-forward signal and obtains second input signal; The individual phase-locked filter unit of N detects N frequency component in first input signal respectively, each phase-locked filter unit carries out phase-locked to described second input signal and filtering is handled, and output phase signal and filtering signal, respectively as the detected value of corresponding frequencies component phase and time-domain signal in first input signal; Each adder has N-1 input, the filtering signal that connects other N-1 phase-locked filter unit output respectively, adder output is connected to second input of a subtracter, each adder is used for the filtering signal summation with other N-1 phase-locked filter unit output, obtains the feed-forward signal of a phase-locked filter unit; Described first input signal is the line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is smaller or equal to the number of the described first input signal medium frequency component.
Further, a kind of described phase-locked filter unit comprises: first converter of Lian Jieing, low pass filter and second converter and phase-locked loop successively; First converter obtains d axle component and q axle component for the Park conversion of described second input signal being carried out under the phase-locked loop coordinate system; Low pass filter is used for described d axle component and described q axle component are carried out low-pass filtering treatment respectively, and exports filtered signal; Second converter, the Park inverse transformation for filtered signal being carried out under the phase-locked loop coordinate system obtains the filtering signal under the rest frame; Phase-locked loop, input is connected to the q axle component output terminal of described first converter, the phase place of described phase-locked loop output is as the phase reference of the coordinate transform of described first converter and described second converter, described phase-locked loop is for detection of described second phase of input signals, as the detected value of corresponding frequencies component phase in first input signal.
Further, another kind of described phase-locked filter unit comprises: second subtracter of Lian Jieing, first converter, first integrator and second converter successively, and phase-locked loop; The second subtracter first input end connects second input signal, and second input connects filtering signal, and subtracter is used for described second input signal is deducted filtering signal, obtains error signal; First converter obtains d axle component and q axle component for the Park conversion of described error signal being carried out under the phase-locked loop coordinate system; First integrator is used for described d axle component and described q axle component are carried out integral processing respectively, and the signal behind the output integration; Second converter, the Park inverse transformation for the signal behind the integration being carried out under the phase-locked loop coordinate system obtains the filtering signal under the rest frame; Phase-locked loop, input is connected to the q axle component output terminal of described first converter, the phase place of described phase-locked loop output is as the phase reference of the coordinate transform of described first converter and described second converter, described phase-locked loop is for detection of described second phase of input signals, as the detected value of corresponding frequencies component phase in described first input signal.
Further, described phase-locked loop comprises: the controller of Lian Jieing, second adder and second integral device successively; Controller, input are connected to the q axle component of described first converter output, and described controller is used for the described phase-locked loop frequency of size adjustment according to the q axle component of described first converter output, obtain the adjustment component of described phase-locked loop frequency; Second adder, first input end connects the output of described controller, second input end signal is the initial given frequency of described phase-locked loop, described adder is used for described frequency is adjusted component and the initial given frequency summation of described phase-locked loop, obtain the frequency of described phase-locked loop, the initial given frequency values of described phase-locked loop is the rated frequency of corresponding frequencies component in first input signal that detects of described phase-locked filter unit; The second integral device is used for described phase-locked loop frequency is carried out integration, obtains the phase place of described phase-locked loop.
In system of the present invention, by the rated frequency that the initial given frequency of phase-locked loop in N the phase-locked filter unit is respectively N frequency component in the mains voltage signal is set, make each phase-locked filter unit respectively in the detection of grid voltage signal rated frequency equal the component of the initial given frequency of phase-locked loop.In the filtering system of phase-locked filter unit, low pass filter or integral feedback have attenuation to high fdrequency component, first converter and second converter have the modulation and demodulation effect to signal frequency, after phase-locked filtering unit filters is handled, the corresponding frequency component of the frequency component that detects with phase-locked filter unit in the input signal of phase-locked filter unit keeps, other frequency component decay.To each phase-locked filter unit, the filtering signal addition that first adder is exported other N-1 phase-locked filter unit obtains the feed-forward signal of this phase-locked filter unit, and first subtracter deducts the input signal that feed-forward signal obtains this phase-locked filter unit with mains voltage signal.Because other N-1 frequency component is offset by feed-forward signal in the mains voltage signal, each phase-locked filter unit improves the accuracy of detection of corresponding frequencies component phase in the mains voltage signal.Simultaneously, because the interference reduction in the input signal, the pll controller bandwidth can suitably improve in the phase-locked filter unit, thereby improves the response speed of phase-detection.Especially, when each frequency component all arranged the phase-locked filter unit of corresponding frequencies in the mains voltage signal, during stable state, each phase-locked filter unit can be distinguished the phase place of corresponding frequencies component in the error free detection of grid voltage signal.In the practical application, by the phase-locked filter unit of the component corresponding frequencies that content is big relatively in the line voltage is set, each phase-locked loop accuracy of detection is met the demands.The method can suppress negative sequence component fully and suppress the harmonic component influence phase-locked to positive sequence component largely, and can extract the phase place of positive and negative order first-harmonic and harmonic component in the line voltage, simultaneously response speed is fast, for the control of grid-connected converter provides reliable electric network voltage phase benchmark.
Description of drawings
Fig. 1 is the structural representation of the phase-locked loop that provides of prior art;
Fig. 2 is the structural representation based on cross-linked multiband phase-locked system that the embodiment of the invention provides;
Fig. 3 is a kind of structural representation based on phase-locked filter unit in the cross-linked multiband phase-locked system that the embodiment of the invention provides;
Fig. 4 is the another kind of structural representation based on phase-locked filter unit in the cross-linked multiband phase-locked system that the embodiment of the invention provides;
Fig. 5 is the structural representation of phase-locked loop in the phase-locked filter unit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
What the embodiment of the invention provided can contain in line voltage under negative phase-sequence and the harmonic component situation based on cross-linked multiband phase-lock technique, quick and precisely detect positive and negative order first-harmonic and harmonic component phase place, this phase-lock technique can be applicable to that electronic power convertor is incorporated into the power networks and the control technology field, for the control of grid-connected converter provides reliable electric network voltage phase benchmark.
The invention provides a kind ofly based on cross-linked multiband phase-lock technique, comprise the steps:
N second input signal respectively through N the phase-locked and filtering processing of phase-locked filter unit, obtained N phase signal and N filtering signal;
To each phase-locked filter unit, with the filtering signal addition of other N-1 phase-locked filter unit output, obtain the feed-forward signal of this phase-locked filter unit, obtain N feed-forward signal altogether;
First input signal is deducted N feed-forward signal respectively obtain N described second input signal;
Described first input signal is the line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is smaller or equal to the number of the described first input signal medium frequency component.
In embodiments of the present invention, described phase-locked filter unit obtains phase signal by phase-locked loop; Described N phase-locked filter unit is by arranging the rated frequency that the initial given frequency of phase-locked loop is respectively N frequency component in first input signal, makes each phase-locked filter unit detect the component that rated frequency in first input signal equals the initial given frequency of phase-locked loop respectively; N phase signal of the phase-locked filter unit output of N and N filtering signal are respectively as the detected value of corresponding frequencies component phase and time-domain signal in first input signal.
In embodiments of the present invention, the acquisition methods of filtering signal has multiple, now provides two kinds of concrete methods.A kind of acquisition methods of filtering signal is specially: (1) after the Park conversion under the phase-locked loop coordinate system, obtains d axle component and q axle component with described second input signal; (2) described d axle component and described q axle component are carried out low-pass filtering respectively after, carry out the Park inverse transformation again, obtain filtering signal.The acquisition methods of filtering signal can also for: (1) error signal obtains d axle component and q axle component after the Park conversion under the phase-locked loop coordinate system; (2) described d axle component and described q axle component are carried out integration respectively after, carry out the Park inverse transformation again, obtain filtering signal; (3) described second input signal deducts described filtering signal and obtains described error signal.
In embodiments of the present invention, by the rated frequency that the initial given frequency of phase-locked loop in N the phase-locked filter unit is respectively N frequency component in the mains voltage signal is set, make each phase-locked filter unit respectively in the detection of grid voltage signal rated frequency equal the component of the initial given frequency of phase-locked loop.The initial given frequency of phase-locked loop has the predetermined effect of selecting the frequency component of phase-locked loop detection.When containing the frequency component that a plurality of amplitudes equate in the phase-locked loop input signal, the phase information that contains the approaching component of input signal medium frequency and the initial given frequency of phase-locked loop in the phase information of phase-locked loop output is big.By setting the initial given frequency of phase-locked loop, make corresponding frequency component in N the phase-locked filter unit difference detection of grid voltage letter.Simultaneously, phase-locked loop can be followed the tracks of the variation of frequency input signal, and when phase-locked loop frequency and frequency input signal were unequal, phase-locked loop made phase-locked loop frequency equal frequency input signal by regulating.During phase-locked filtering unit filters is handled, the modulation and demodulation signal of frequency comes from phase-locked loop, follow the tracks of frequency input signal by phase-locked loop, the variation of modulation and demodulation frequency energy self adaptation electrical network frequency makes corresponding frequencies component in the more accurate detection of grid voltage signal of filtering signal.
In the acquisition methods of first kind of filtering signal of the embodiment of the invention, because low pass filter is to the attenuation of high fdrequency component, and Park conversion and inverse transformation are to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters is handled, the corresponding frequency component of the frequency component that detects with phase-locked filter unit in the input signal of phase-locked filter unit keeps, other frequency component decay, filtering signal can be used as the detected value of corresponding frequencies component time-domain signal in the mains voltage signal.In the acquisition methods of second kind of filtering signal, because integral feedback is to the attenuation of high fdrequency component, and Park conversion and inverse transformation are to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters is handled, the corresponding frequency component of the frequency component that detects with phase-locked filter unit in the input signal of phase-locked filter unit keeps, other frequency component decay, filtering signal can be used as the detected value of corresponding frequencies component time-domain signal in the mains voltage signal.
In embodiments of the present invention, N N frequency component in the phase-locked filter unit difference detection of grid voltage signal is set, phase-locked filtering unit filters is handled the time-domain signal that the filtering signal that obtains is respectively corresponding frequencies component in the line voltage, to each phase-locked filter unit, be fed forward to the input of this phase-locked loop by the filtering signal with other N-1 phase-locked filter unit output, offset in the mains voltage signal other N-1 frequency component to the interference of the phase-locked filtering of this phase-locked filter unit, thereby improve each phase-locked filter unit to the accuracy of detection of corresponding frequencies component phase in the mains voltage signal.Simultaneously, because the interference reduction in the input signal, the pll controller bandwidth can suitably improve in the phase-locked filter unit, thereby improves the response speed of phase-detection.Especially, when each frequency component all arranged the phase-locked filter unit of corresponding frequencies in the mains voltage signal, during stable state, each phase-locked filter unit can be distinguished the phase place of corresponding frequencies component in the error free detection of grid voltage signal.In the practical application, by the phase-locked filter unit of the component corresponding frequencies that content is big relatively in the line voltage is set, each phase-locked loop accuracy of detection is met the demands.The method can suppress negative sequence component fully and suppress the harmonic component influence phase-locked to positive sequence component largely, and can extract the phase place of positive and negative order first-harmonic and harmonic component in the line voltage, simultaneously response speed is fast, for the control of grid-connected converter provides reliable electric network voltage phase benchmark.
In embodiments of the present invention, realize that above-mentioned system based on cross-linked multiband phase-lock technique has a variety of, Fig. 2 shows a kind of system configuration that realizes based on cross-linked multiband phase-lock technique that the embodiment of the invention provides, for convenience of explanation, only show the part relevant with the embodiment of the invention, details are as follows:
Comprise N first subtracter 1, a N phase-locked filter unit 2 and N first adder 3 based on cross-linked multiband phase-locked system; The first input end of each subtracter 1 connects the first input signal V
In, second input of each subtracter 1 connects the output V of an adder 3
Fk, the output of each subtracter 1 connects the input of a phase-locked filter unit 2, and subtracter is used for that first input signal is deducted feed-forward signal and obtains the second input signal V
InkPhase-locked filter unit 2 is used for the second input signal V
InkCarry out phase-locked and the filtering processing, and output phase signal θ
kWith filtering signal V
Lk, respectively as the detected value of corresponding frequencies component phase and time-domain signal in first input signal; Each adder 3 has N-1 input, the filtering signal that connects other N-1 phase-locked filter unit output respectively, the output of each adder 3 is connected to second input of a subtracter 1, each adder is used for the filtering signal summation with other N-1 phase-locked filter unit output, obtains feed-forward signal V
FkDescribed first input signal is the line voltage input signal, and described second input signal is described phase-locked filter unit input signal, and N is smaller or equal to the number of the described first input signal medium frequency component, the span of k be k ∈ (1,2 ..., N).
In embodiments of the present invention, the internal structure of phase-locked filter unit 2 can have various ways, and the embodiment of the invention provides two kinds of concrete structures.A kind of phase-locked filter unit 2 structures comprise as shown in Figure 3: first converter 21 of Lian Jieing, low pass filter 22 and second converter 24 successively, and phase-locked loop 23; First converter 21 is used for the described second input signal V
InkCarry out the Park conversion under the phase-locked loop coordinate system, obtain d axle component v
DkWith q axle component v
Qk Low pass filter 22 is used for described v
DkAnd v
QkCarry out low-pass filtering treatment respectively, and export filtered signal v '
DkAnd v '
Qk Second converter 24 is used for filtered signal v '
DkAnd v '
QkCarry out the Park inverse transformation under the phase-locked loop coordinate system, obtain the filtering signal V under the rest frame
LkPhase-locked loop 23, input are connected to the q axle component v of described first converter 21 outputs
Qk, the phase place of described phase-locked loop output is as the phase reference of the coordinate transform of described first converter and described second converter, and described phase-locked loop 23 is for detection of the second input signal V
InkPhase place, as the detected value of corresponding frequencies component phase in first input signal.
Another kind of phase-locked filter unit 2 structures comprise: second subtracter 20, first converter 21, first integrator 25, second converter 24 and phase-locked loop 23 as shown in Figure 4; First converter 21 is used for error signal V
EkCarry out the Park conversion under the phase-locked loop coordinate system, obtain d axle component v
DkWith q axle component v
Qk First integrator 25 is used for described v
DkAnd v
QkCarry out integral processing respectively, and the signal v ' behind the output integration
DkAnd v '
Qk Second converter 24 is used for v '
DkAnd v '
QkCarry out the Park inverse transformation under the phase-locked loop coordinate system, obtain the filtering signal V under the rest frame
Lk Second subtracter 20 is used for the described second input signal V
InkWith described filtering signal V
LkAsk poor, obtain error signal V
EkPhase-locked loop 23, input are connected to the q axle component v of described first converter 21 outputs
Qk, the phase place of described phase-locked loop output is as the phase reference of the coordinate transform of described first converter and described second converter, and described phase-locked loop 23 is for detection of the second input signal V
InkPhase place, as the detected value of corresponding frequencies component phase in first input signal.
The concrete structure of phase-locked loop 23 as shown in Figure 5, phase-locked loop 23 comprises successively controller 231, second adder 232 and the second integral device 233 that connects; The input signal of phase-locked loop 23 is v
QkController 231 is used for according to v
QkSize adjust the frequency of phase-locked loop, the frequency that obtains phase-locked loop is adjusted component Δ ω
kSecond adder, first input end are that described frequency is adjusted component Δ ω
k, second input is the initial given frequencies omega of described phase-locked loop
0k, described adder is used for described frequency is adjusted component and the initial given frequency summation of described phase-locked loop, forms the frequencies omega of described phase-locked loop
k, the initial given frequencies omega of described phase-locked loop
kValue is the rated frequency of corresponding frequencies component in first input signal that detects of described phase-locked filter unit; The second integral device is used for the frequency of described adder output is carried out integration, obtains the phase theta of described phase-locked loop
k
In embodiments of the present invention, by the rated frequency that the initial given frequency of phase-locked loop in N the phase-locked filter unit is respectively N frequency component in the mains voltage signal is set, make each phase-locked filter unit respectively in the detection of grid voltage signal rated frequency equal the component of the initial given frequency of phase-locked loop.The initial given frequency of phase-locked loop has the predetermined effect of selecting the frequency component of phase-locked loop detection.When containing the frequency component that a plurality of amplitudes equate in the phase-locked loop input signal, the phase information that contains the approaching component of input signal medium frequency and the initial given frequency of phase-locked loop in the phase information of phase-locked loop output is big.By setting the initial given frequency of phase-locked loop, make corresponding frequency component in N the phase-locked filter unit difference detection of grid voltage letter.Simultaneously, phase-locked loop can be followed the tracks of the variation of frequency input signal, and when phase-locked loop frequency and frequency input signal were unequal, phase-locked loop made phase-locked loop frequency equal frequency input signal by regulating.During phase-locked filtering unit filters is handled, the modulation and demodulation signal of frequency comes from phase-locked loop, follow the tracks of frequency input signal by phase-locked loop, the variation of modulation and demodulation frequency energy self adaptation electrical network frequency makes corresponding frequencies component in the more accurate detection of grid voltage signal of filtering signal.
In first kind of phase-locked filter unit structure of the embodiment of the invention, because low pass filter is to the attenuation of high fdrequency component, and first converter and second converter to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters is handled, the corresponding frequency component of the frequency component that detects with phase-locked filter unit in the input signal of phase-locked filter unit keeps, other frequency component decay, filtering signal can be used as the detected value of corresponding frequencies component time-domain signal in the mains voltage signal.In second kind of phase-locked filter unit structure, because integral feedback is to the attenuation of high fdrequency component, and first converter and second converter to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters is handled, the corresponding frequency component of the frequency component that detects with phase-locked filter unit in the input signal of phase-locked filter unit keeps, other frequency component decay, filtering signal can be used as the detected value of corresponding frequencies component time-domain signal in the mains voltage signal.
In embodiments of the present invention, N N frequency component in the phase-locked filter unit difference detection of grid voltage signal is set, to each phase-locked filter unit, the filtering signal addition that first adder is exported other N-1 phase-locked filter unit obtains the feed-forward signal of this phase-locked filter unit, and first subtracter deducts the input signal that feed-forward signal obtains this phase-locked filter unit with mains voltage signal.Because other N-1 frequency component is offset by feed-forward signal in the mains voltage signal, each phase-locked filter unit improves the accuracy of detection of corresponding frequencies component phase in the mains voltage signal.Simultaneously, because the interference reduction in the input signal, the pll controller bandwidth can suitably improve in the phase-locked filter unit, thereby improves the response speed of phase-detection.Especially, when each frequency component all arranged the phase-locked filter unit of corresponding frequencies in the mains voltage signal, during stable state, each phase-locked filter unit can be distinguished the phase place of corresponding frequencies component in the error free detection of grid voltage signal.In the practical application, by the phase-locked filter unit of the component corresponding frequencies that content is big relatively in the line voltage is set, each phase-locked loop accuracy of detection is met the demands.The method can suppress negative sequence component fully and suppress the harmonic component influence phase-locked to positive sequence component largely, and can extract the phase place of positive and negative order first-harmonic and harmonic component in the line voltage, simultaneously response speed is fast, for the control of grid-connected converter provides reliable electric network voltage phase benchmark.
Those skilled in the art will readily understand; the above only is preferred embodiment of the present invention; not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. one kind based on cross-linked multiband phase-lock technique, it is characterized in that, comprises the steps:
N second input signal respectively through N the phase-locked and filtering processing of phase-locked filter unit, obtained N phase signal and N filtering signal;
To each phase-locked filter unit, with the filtering signal addition of other N-1 phase-locked filter unit output, obtain the feed-forward signal of this phase-locked filter unit, obtain N feed-forward signal altogether;
First input signal is deducted N feed-forward signal respectively, obtain N described second input signal;
Described first input signal is the line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is smaller or equal to the number of the described first input signal medium frequency component.
2. multiband phase-lock technique as claimed in claim 1 is characterized in that, described phase-locked filter unit obtains phase signal by phase-locked loop; Described N phase-locked filter unit is by arranging the rated frequency that the initial given frequency of phase-locked loop is respectively N frequency component in first input signal, makes each phase-locked filter unit detect the component that rated frequency in first input signal equals the initial given frequency of phase-locked loop respectively; With N phase signal of the phase-locked filter unit output of N and N filtering signal respectively as the detected value of corresponding frequencies component phase and time-domain signal in first input signal.
3. multiband phase-lock technique as claimed in claim 1 is characterized in that, the acquisition methods of described filtering signal is specially:
(1) with described second input signal after the Park conversion under the phase-locked loop coordinate system, obtain d axle component and q axle component;
(2) described d axle component and described q axle component are carried out low-pass filtering respectively after, carry out the Park inverse transformation again and obtain described filtering signal.
4. multiband phase-lock technique as claimed in claim 1 is characterized in that, the acquisition methods of described filtering signal is specially:
(1) error signal gets after the Park conversion under the phase-locked loop coordinate system, to d axle component and q axle component;
(2) described d axle component and described q axle component are carried out integration respectively after, carry out the Park inverse transformation again and obtain described filtering signal;
(3) described second input signal deducts described filtering signal, obtains described error signal.
5. a system that realizes each described multiband phase-lock technique of claim 1-4 is characterized in that, comprises N first subtracter, a N phase-locked filter unit and N first adder;
The first input end of each subtracter connects first input signal, second input of each subtracter connects the output of an adder, the output of each subtracter connects the input of a phase-locked filter unit, and subtracter is used for that first input signal is deducted feed-forward signal and obtains second input signal;
The individual phase-locked filter unit of N detects N frequency component in first input signal respectively, each phase-locked filter unit carries out phase-locked to described second input signal and filtering is handled, and output phase signal and filtering signal, respectively as the detected value of corresponding frequencies component phase and time-domain signal in first input signal;
Each adder has N-1 input, the filtering signal that connects other N-1 phase-locked filter unit output respectively, adder output is connected to second input of a subtracter, each adder is used for the filtering signal summation with other N-1 phase-locked filter unit output, obtains the feed-forward signal of a phase-locked filter unit;
Described first input signal is the line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is smaller or equal to the number of the described first input signal medium frequency component.
6. system as claimed in claim 5 is characterized in that, described phase-locked filter unit comprises: first converter of Lian Jieing, low pass filter and second converter and phase-locked loop successively;
First converter obtains d axle component and q axle component for the Park conversion of described second input signal being carried out under the phase-locked loop coordinate system;
Low pass filter is used for described d axle component and described q axle component are carried out low-pass filtering treatment respectively, and exports filtered signal;
Second converter, the Park inverse transformation for filtered signal being carried out under the phase-locked loop coordinate system obtains the filtering signal under the rest frame;
Phase-locked loop, input is connected to the q axle component output terminal of described first converter, the phase place of described phase-locked loop output is as the phase reference of the coordinate transform of described first converter and described second converter, described phase-locked loop is for detection of described second phase of input signals, as the detected value of corresponding frequencies component phase in first input signal.
7. system as claimed in claim 5 is characterized in that, described phase-locked filter unit comprises: second subtracter of Lian Jieing, first converter, first integrator and second converter successively, and phase-locked loop;
The second subtracter first input end connects second input signal, and second input connects filtering signal, and subtracter is used for described second input signal is deducted filtering signal, obtains error signal;
First converter obtains d axle component and q axle component for the Park conversion of described error signal being carried out under the phase-locked loop coordinate system;
First integrator is used for described d axle component and described q axle component are carried out integral processing respectively, and the signal behind the output integration;
Second converter, the Park inverse transformation for the signal behind the integration being carried out under the phase-locked loop coordinate system obtains the filtering signal under the rest frame;
Phase-locked loop, input is connected to the q axle component output terminal of described first converter, the phase place of described phase-locked loop output is as the phase reference of the coordinate transform of described first converter and described second converter, described phase-locked loop is for detection of described second phase of input signals, as the detected value of corresponding frequencies component phase in described first input signal.
8. as claim 6 or 7 described systems, it is characterized in that described phase-locked loop comprises: the controller of Lian Jieing, second adder and second integral device successively;
Controller, input are connected to the q axle component of described first converter output, and described controller is used for the described phase-locked loop frequency of size adjustment according to the q axle component of described first converter output, obtain the adjustment component of described phase-locked loop frequency;
Second adder, first input end connects the output of described controller, second input end signal is the initial given frequency of described phase-locked loop, described adder is used for the frequency of described phase-locked loop is adjusted the initial given frequency summation of component and described phase-locked loop, obtain the frequency of described phase-locked loop, the initial given frequency values of described phase-locked loop is the rated frequency of corresponding frequencies component in first input signal that detects of described phase-locked filter unit;
The second integral device is used for described phase-locked loop frequency is carried out integration, obtains the phase place of described phase-locked loop.
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