CN103281077B - A kind of based on cross-linked multiband phase-lock technique and system - Google Patents
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Abstract
The invention discloses a kind of based on cross-linked multiband phase-lock technique and system.In the method and system, multiple frequency component in multiple phase-locked filter unit difference detection of grid voltage is set, to each phase-locked filter unit, the each frequency component obtained after other phase-locked filtering unit filters process is fed forward to the input of this phase-locked loop, to offset the interference of and the filtering phase-locked to this phase-locked filter unit of other frequency component in mains voltage signal.Because intersection feedforward action inhibits the interference of other frequency component, each phase-locked filter unit improves the accuracy of detection of corresponding frequencies component phase in mains voltage signal, simultaneously, in phase-locked filter unit, bandwidth of phase lock loop can suitably improve, thus improves the response speed of phase-locked filter unit phase-detection.The method can be asymmetric with when distorting at line voltage, and quick and precisely extract the phase place of positive and negative sequence first-harmonic and harmonic component in line voltage, the control for grid-connected converter provides reliable electric network voltage phase benchmark.
Description
Technical field
The present invention relates to electronic power convertor to be incorporated into the power networks and 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 the electrical network friendly of electrical network to generation of electricity by new energy have higher requirement.Under the condition of electric network fault, distortion, current transformer need keep being incorporated into the power networks and meet certain active power, reactive power output requirement.HVDC (High Voltage Direct Current) transmission system needs to keep high reliability in the various running environment such as electric network fault, distortion.The control of current transformer is based on grid voltage orientation, and quick and precisely detection of grid voltage-phase is that current transformer keeps controlled prerequisite when electric network fault or distortion.
Current grid-connected converter generally uses software phase-lock loop detection of grid voltage-phase, and its structured flowchart as shown in Figure 1.General principle is: detection of grid voltage signal v
a, v
b, v
c, it is carried out Park conversion under phase-locked loop coordinate system, obtains q axle component v
qwith d axle component v
d.V
qthe error of electric network voltage phase and phase-locked loop phasetophase can be reflected.V
qforming frequency adjustment component Δ ω after via controller regulates.Δ ω adds the initial given frequencies omega of phase-locked loop
0form phase-locked loop frequency ω, ω forms phase-locked loop phase theta after integration.When phase-locked loop phase place and electric network voltage phase have error, phase-locked loop frequency and phase place will regulate, until both frequencies are equal with phase place.Phase-locked loop exports the detected value of phase theta as electric network voltage phase.
When in line voltage only containing fundamental positive sequence time, phase-locked loop can quick and precisely detection of grid voltage-phase.When containing negative phase-sequence and harmonic component in line voltage, v
qmiddlely will occur alternating current component, controller cannot suppress the interference of this alternating current component completely, makes phase-locked loop can not the phase place of accurate detection of grid voltage fundamental positive sequence component.
At present, engineering generally adopt the method reducing controller bandwidth suppress the interference of negative phase-sequence and harmonic component.The dynamic responding speed of phase-locked loop but the method has slowed down, is unfavorable for effective control of current transformer.On the other hand, in some cases, current transformer need to negative phase-sequence even harmonic current control, this needs phase-locked loop can extract the phase information of line voltage negative phase-sequence and harmonic component.Phase-locked loop conventional at present cannot meet this requirement.
Summary of the invention
For the defect of prior art, the invention provides a kind of based on cross-linked multiband phase-lock technique, be intended to solve the problem that existing phase-locked loop quick and precisely cannot extract electric network voltage phase information under unbalanced source voltage and distortion situation.
The invention provides a kind of based on cross-linked multiband phase-lock technique, comprise the steps:
By and the filtering process phase-locked through N number of phase-locked filter unit respectively of N number of second input signal, obtain N number of phase signal and N number of filtering signal;
To each phase-locked filter unit, the filtering signal exported by other N-1 phase-locked filter unit is added, and obtains the feed-forward signal of this phase-locked filter unit, obtains N number of feed-forward signal altogether;
First input signal is deducted N number of feed-forward signal respectively, obtains N number of described second input signal;
Described first input signal is line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is less than or equal to the number of described first input signal frequency components.
Further, described phase-locked filter unit obtains phase signal by phase-locked loop; Described N number of phase-locked filter unit is respectively the rated frequency of the N number of frequency component in the first input signal by arranging the initial given frequency of phase-locked loop, each phase-locked filter unit is detected respectively component that rated frequency in the first input signal equals the initial given frequency of phase-locked loop; The N number of phase signal export N number of phase-locked filter unit and N number of filtering signal are as the phase place of corresponding frequencies component in the first input signal and the detected value of time-domain signal.
Further, a kind of method obtaining described filtering signal is specially:
(1) by described second input signal through under phase-locked loop coordinate system Park conversion after, obtain d axle component and q axle component; (2) after described d axle component and described q axle component being carried out low-pass filtering respectively, then carry out Park inverse transformation and obtain described filtering signal.
Further, the another kind of method obtaining described filtering signal is specially:
(1) error signal obtains, to d axle component and q axle component after the Park conversion under phase-locked loop coordinate system; (2) after described d axle component and described q axle component being carried out integration respectively, then carry out Park inverse transformation and obtain described filtering signal; (3) described second input signal deducts described filtering signal, obtains described error signal.
In the present invention, be respectively the rated frequency of the N number of frequency component in mains voltage signal by arranging the initial given frequency of phase-locked loop in N number of phase-locked filter unit, make each phase-locked filter unit respectively in 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 to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters process, frequency component corresponding with the frequency component that phase-locked filter unit detects in the input signal of phase-locked filter unit keeps, and other frequency component decays.To each phase-locked filter unit, the input of this phase-locked loop is fed forward to by the filtering signal exported by other N-1 phase-locked filter unit, in counteracting mains voltage signal, other N-1 frequency component is to the interference of the phase-locked filtering of this phase-locked filter unit, thus improves the accuracy of detection of each phase-locked filter unit to corresponding frequencies component phase in mains voltage signal.Meanwhile, due to the interference reduction in input signal, in phase-locked filter unit, pll controller bandwidth can suitably improve, thus improves the response speed of phase-detection.Especially, when frequency component each in mains voltage signal all arranges the phase-locked filter unit of corresponding frequencies, during stable state, each phase-locked filter unit can distinguish the phase place of corresponding frequencies component in error free detection of grid voltage signal.In practical application, by arranging the phase-locked filter unit of the relatively large component corresponding frequencies of content in line voltage, each phase-locked loop accuracy of detection can be made to meet the demands.The method can suppress negative sequence component and harmonic inhabitation component is phase-locked on positive sequence component largely impact completely, and the phase place of positive and negative sequence first-harmonic and harmonic component in line voltage can be extracted, fast response time simultaneously, the control for grid-connected converter provides reliable electric network voltage phase benchmark.
Present invention also offers a kind of system realizing above-mentioned multiband phase-lock technique, comprise N number of first subtracter, N number of phase-locked filter unit and N number of first adder; The first input end of each subtracter connects the 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 the first input signal is deducted feed-forward signal and obtains the second input signal; N number of phase-locked filter unit detects the N number of frequency component in the first input signal respectively, each phase-locked filter unit carries out phase-locked and filtering process to described second input signal, and export phase signal and filtering signal, respectively as the detected value of corresponding frequencies component phase and time-domain signal in the first input signal; Each adder has N-1 input, connect the filtering signal that other N-1 phase-locked filter unit exports respectively, adder output is connected to the second input of a subtracter, each adder is used for the filtering signal summation exported by other N-1 phase-locked filter unit, obtains the feed-forward signal of a phase-locked filter unit; Described first input signal is line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is less than or equal to the number of described first input signal frequency components.
Further, a kind of described phase-locked filter unit comprises: the first converter connected successively, low pass filter and the second converter and phase-locked loop; First converter is used for the Park conversion carried out by described second input signal under phase-locked loop coordinate system, obtains d axle component and q axle component; Low pass filter, for described d axle component and described q axle component are carried out low-pass filtering treatment respectively, and the signal after output filtering; Second converter, for filtered signal being carried out the Park inverse transformation under phase-locked loop coordinate system, obtains the filtering signal under rest frame; Phase-locked loop, input is connected to the q axle component output terminal of described first converter, the phase place that described phase-locked loop exports is as the phase reference of the coordinate transform of described first converter and described second converter, described phase-locked loop for detecting the phase place of described second input signal, as the detected value of corresponding frequencies component phase in the first input signal.
Further, another kind of described phase-locked filter unit comprises: the second subtracter connected successively, the first converter, first integrator and the second converter, and phase-locked loop; Second subtracter first input end connects the second input signal, and the second input connects filtering signal, and subtracter is used for described second input signal to deduct filtering signal, obtains error signal; First converter is used for the Park conversion described error signal carried out under phase-locked loop coordinate system, obtains d axle component and q axle component; First integrator, for described d axle component and described q axle component are carried out integral processing respectively, and exports the signal after integration; Second converter, for the signal after integration being carried out the Park inverse transformation under phase-locked loop coordinate system, obtains the filtering signal under rest frame; Phase-locked loop, input is connected to the q axle component output terminal of described first converter, the phase place that described phase-locked loop exports is as the phase reference of the coordinate transform of described first converter and described second converter, described phase-locked loop for detecting the phase place of described second input signal, as the detected value of corresponding frequencies component phase in described first input signal.
Further, described phase-locked loop comprises: the controller connected successively, second adder and second integral device; Controller, input is connected to the q axle component that described first converter exports, and described controller is used for phase-locked loop frequency according to the size adjustment of the q axle component of described first converter output, obtains 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 adjustment component and the initial given frequency of described phase-locked loop to sue for peace, 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 the first input signal of described phase-locked filter unit detection; Second integral device is used for described phase-locked loop frequency to carry out integration, obtains the phase place of described phase-locked loop.
In the system of the present invention, be respectively the rated frequency of the N number of frequency component in mains voltage signal by arranging the initial given frequency of phase-locked loop in N number of phase-locked filter unit, make each phase-locked filter unit respectively in 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 the second converter have modulation and demodulation effect to signal frequency, after phase-locked filtering unit filters process, frequency component corresponding with the frequency component that phase-locked filter unit detects in the input signal of phase-locked filter unit keeps, and other frequency component decays.To each phase-locked filter unit, the filtering signal that other N-1 phase-locked filter unit exports by first adder is added the feed-forward signal obtaining this phase-locked filter unit, and mains voltage signal is deducted the input signal that feed-forward signal obtains this phase-locked filter unit by the first subtracter.Because in mains voltage signal, other N-1 frequency component is offset by feed-forward signal, each phase-locked filter unit improves the accuracy of detection of corresponding frequencies component phase in mains voltage signal.Meanwhile, due to the interference reduction in input signal, in phase-locked filter unit, pll controller bandwidth can suitably improve, thus improves the response speed of phase-detection.Especially, when frequency component each in mains voltage signal all arranges the phase-locked filter unit of corresponding frequencies, during stable state, each phase-locked filter unit can distinguish the phase place of corresponding frequencies component in error free detection of grid voltage signal.In practical application, by arranging the phase-locked filter unit of the relatively large component corresponding frequencies of content in line voltage, each phase-locked loop accuracy of detection can be made to meet the demands.The method can suppress negative sequence component and harmonic inhabitation component is phase-locked on positive sequence component largely impact completely, and the phase place of positive and negative sequence first-harmonic and harmonic component in line voltage can be extracted, fast response time simultaneously, the control for grid-connected converter provides reliable electric network voltage phase benchmark.
Accompanying drawing explanation
Fig. 1 is the structural representation of the phase-locked loop that prior art provides;
Fig. 2 is the structural representation based on cross-linked multiband phase-locked system that the embodiment of the present invention provides;
Fig. 3 is a kind of structural representation based on phase-locked filter unit in cross-linked multiband phase-locked system that the embodiment of the present invention provides;
Fig. 4 is the another kind of structural representation based on phase-locked filter unit in cross-linked multiband phase-locked system that the embodiment of the present 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 present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, 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 explain the present invention, be not intended to limit the present invention.
What the embodiment of the present invention provided can containing under negative phase-sequence and harmonic component situation in line voltage based on cross-linked multiband phase-lock technique, quick and precisely detect positive and negative sequence first-harmonic and harmonic component phase place, this phase-lock technique can be applicable to electronic power convertor and is incorporated into the power networks and control technology field, and the control for grid-connected converter provides reliable electric network voltage phase benchmark.
The invention provides a kind of based on cross-linked multiband phase-lock technique, comprise the steps:
By and the filtering process phase-locked through N number of phase-locked filter unit respectively of N number of second input signal, obtain N number of phase signal and N number of filtering signal;
To each phase-locked filter unit, the filtering signal exported by other N-1 phase-locked filter unit is added, and obtains the feed-forward signal of this phase-locked filter unit, obtains N number of feed-forward signal altogether;
First input signal is deducted respectively N number of feed-forward signal and obtain N number of described second input signal;
Described first input signal is line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is less than or equal to the number of described first input signal frequency components.
In embodiments of the present invention, described phase-locked filter unit obtains phase signal by phase-locked loop; Described N number of phase-locked filter unit is respectively the rated frequency of the N number of frequency component in the first input signal by arranging the initial given frequency of phase-locked loop, each phase-locked filter unit is detected respectively component that rated frequency in the first input signal equals the initial given frequency of phase-locked loop; N number of phase signal that N number of phase-locked filter unit exports and N number of filtering signal are respectively as the detected value of corresponding frequencies component phase and time-domain signal in the 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: described second input signal after the Park conversion under phase-locked loop coordinate system, is obtained d axle component and q axle component by (1); (2) after described d axle component and described q axle component being carried out low-pass filtering respectively, then carry out Park inverse transformation, obtain filtering signal.The acquisition methods of filtering signal can also be: (1) error signal, after the Park conversion under phase-locked loop coordinate system, obtains d axle component and q axle component; (2) after described d axle component and described q axle component being carried out integration respectively, then carry out Park inverse transformation, obtain filtering signal; (3) described second input signal deducts described filtering signal and obtains described error signal.
In embodiments of the present invention, be respectively the rated frequency of the N number of frequency component in mains voltage signal by arranging the initial given frequency of phase-locked loop in N number of phase-locked filter unit, make each phase-locked filter unit respectively in 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 effect of the predetermined frequency component selecting phase-locked loop to detect.When in phase-locked loop input signal containing multiple amplitude equal frequency component time, the phase information containing input signal medium frequency and the close component of the initial given frequency of phase-locked loop in the phase information that phase-locked loop exports is large.By the initial given frequency of setting phase-locked loop, make corresponding frequency component in N number of phase-locked filter unit difference detection of grid voltage letter.Meanwhile, phase-locked loop can follow the tracks of the change of frequency input signal, when phase-locked loop frequency and frequency input signal unequal time, phase-locked loop by regulate, make phase-locked loop frequency equal frequency input signal.In phase-locked filtering unit filters process, the modulation and demodulation signal of frequency comes from phase-locked loop, follow the tracks of frequency input signal by phase-locked loop, the change of modulation and demodulation frequency energy self adaptation mains frequency, makes corresponding frequencies component in the more accurate detection of grid voltage signal of filtering signal.
In the acquisition methods of the first filtering signal of the embodiment of the present invention, because low pass filter is to the attenuation of high fdrequency component, and Park conversion and inverse transformation to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters process, frequency component corresponding with the frequency component that phase-locked filter unit detects in the input signal of phase-locked filter unit keeps, other frequency component decays, and filtering signal can be used as the detected value of corresponding frequencies component time-domain signal in mains voltage signal.In the acquisition methods of the second filtering signal, because integral feedback is to the attenuation of high fdrequency component, and Park conversion and inverse transformation to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters process, frequency component corresponding with the frequency component that phase-locked filter unit detects in the input signal of phase-locked filter unit keeps, other frequency component decays, and filtering signal can be used as the detected value of corresponding frequencies component time-domain signal in mains voltage signal.
In embodiments of the present invention, N number of frequency component in N number of phase-locked filter unit difference detection of grid voltage signal is set, the filtering signal that phase-locked filtering unit filters process obtains is respectively the time-domain signal of corresponding frequencies component in line voltage, to each phase-locked filter unit, the input of this phase-locked loop is fed forward to by the filtering signal exported by other N-1 phase-locked filter unit, in counteracting mains voltage signal, other N-1 frequency component is to the interference of the phase-locked filtering of this phase-locked filter unit, thus improve the accuracy of detection of each phase-locked filter unit to corresponding frequencies component phase in mains voltage signal.Meanwhile, due to the interference reduction in input signal, in phase-locked filter unit, pll controller bandwidth can suitably improve, thus improves the response speed of phase-detection.Especially, when frequency component each in mains voltage signal all arranges the phase-locked filter unit of corresponding frequencies, during stable state, each phase-locked filter unit can distinguish the phase place of corresponding frequencies component in error free detection of grid voltage signal.In practical application, by arranging the phase-locked filter unit of the relatively large component corresponding frequencies of content in line voltage, each phase-locked loop accuracy of detection can be made to meet the demands.The method can suppress negative sequence component and harmonic inhabitation component is phase-locked on positive sequence component largely impact completely, and the phase place of positive and negative sequence first-harmonic and harmonic component in line voltage can be extracted, fast response time simultaneously, the control for grid-connected converter provides reliable electric network voltage phase benchmark.
In embodiments of the present invention, realizing the above-mentioned system based on cross-linked multiband phase-lock technique has a variety of, Fig. 2 shows a kind of system configuration realized based on cross-linked multiband phase-lock technique that the embodiment of the present invention provides, for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows:
N number of first subtracter 1, N number of phase-locked filter unit 2 and N number of first adder 3 is comprised based on cross-linked multiband phase-locked system; The first input end of each subtracter 1 connects the first input signal V
in, the 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 the first input signal is deducted feed-forward signal and obtains the second input signal V
ink; Phase-locked filter unit 2 is for the second input signal V
inkcarry out phase-locked and filtering process, and export phase signal θ
kwith filtering signal V
lk, respectively as the detected value of corresponding frequencies component phase and time-domain signal in the first input signal; Each adder 3 has N-1 input, connect the filtering signal that other N-1 phase-locked filter unit exports respectively, the output of each adder 3 is connected to the second input of a subtracter 1, each adder is used for the filtering signal summation exported by other N-1 phase-locked filter unit, obtains feed-forward signal V
fk; Described first input signal is line voltage input signal, and described second input signal is described phase-locked filter unit input signal, and N is less than or equal to the number of described first input signal frequency components, 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, embodiments provides two kinds of concrete structures.A kind of phase-locked filter unit 2 structure as shown in Figure 3, comprising: the first converter 21 connected successively, low pass filter 22 and the second converter 24, and phase-locked loop 23; First converter 21 is for by described second input signal V
inkcarry out the Park conversion under phase-locked loop coordinate system, obtain d axle component v
dkwith q axle component v
qk; Low pass filter 22, for by described v
dkand v
qkcarry out low-pass filtering treatment respectively, and the signal v ' after output filtering
dkand v '
qk; Second converter 24, for by filtered signal v '
dkand v '
qkcarry out the Park inverse transformation under phase-locked loop coordinate system, obtain the filtering signal V under rest frame
lk; Phase-locked loop 23, input is connected to the q axle component v that described first converter 21 exports
qk, the phase place that described phase-locked loop exports 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 detecting the second input signal V
inkphase place, as the detected value of corresponding frequencies component phase in the first input signal.
Another kind of phase-locked filter unit 2 structure as shown in Figure 4, comprising: the second subtracter 20, first converter 21, first integrator 25, second converter 24 and phase-locked loop 23; First converter 21 is for by error signal V
ekcarry out the Park conversion under phase-locked loop coordinate system, obtain d axle component v
dkwith q axle component v
qk; First integrator 25, for by described v
dkand v
qkcarry out integral processing respectively, and export the signal v ' after integration
dkand v '
qk; Second converter 24, for by v '
dkand v '
qkcarry out the Park inverse transformation under phase-locked loop coordinate system, obtain the filtering signal V under rest frame
lk; Second subtracter 20 is for by described second input signal V
inkwith described filtering signal V
lkask poor, obtain error signal V
ek; Phase-locked loop 23, input is connected to the q axle component v that described first converter 21 exports
qk, the phase place that described phase-locked loop exports 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 detecting the second input signal V
inkphase place, as the detected value of corresponding frequencies component phase in the first input signal.
As shown in Figure 5, phase-locked loop 23 comprises the controller 231, second adder 232 and the second integral device 233 that connect successively to the concrete structure of phase-locked loop 23; The input signal of phase-locked loop 23 is v
qk; Controller 231, is used for according to v
qkthe frequency of size adjustment phase-locked loop, obtain the frequency adjustment component Δ ω of phase-locked loop
k; Second adder, first input end is described frequency adjustment component Δ ω
k, the second input is the initial given frequencies omega of described phase-locked loop
0k, described adder is used for described frequency adjustment component and the initial given frequency of described phase-locked loop to sue for peace, and 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 the first input signal of described phase-locked filter unit detection; The frequency that second integral device is used for described adder to export carries out integration, obtains the phase theta of described phase-locked loop
k.
In embodiments of the present invention, be respectively the rated frequency of the N number of frequency component in mains voltage signal by arranging the initial given frequency of phase-locked loop in N number of phase-locked filter unit, make each phase-locked filter unit respectively in 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 effect of the predetermined frequency component selecting phase-locked loop to detect.When in phase-locked loop input signal containing multiple amplitude equal frequency component time, the phase information containing input signal medium frequency and the close component of the initial given frequency of phase-locked loop in the phase information that phase-locked loop exports is large.By the initial given frequency of setting phase-locked loop, make corresponding frequency component in N number of phase-locked filter unit difference detection of grid voltage letter.Meanwhile, phase-locked loop can follow the tracks of the change of frequency input signal, when phase-locked loop frequency and frequency input signal unequal time, phase-locked loop by regulate, make phase-locked loop frequency equal frequency input signal.In phase-locked filtering unit filters process, the modulation and demodulation signal of frequency comes from phase-locked loop, follow the tracks of frequency input signal by phase-locked loop, the change of modulation and demodulation frequency energy self adaptation mains frequency, makes corresponding frequencies component in the more accurate detection of grid voltage signal of filtering signal.
In the first phase-locked filter unit structure of the embodiment of the present invention, because low pass filter is to the attenuation of high fdrequency component, and first converter and the second converter to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters process, frequency component corresponding with the frequency component that phase-locked filter unit detects in the input signal of phase-locked filter unit keeps, other frequency component decays, and filtering signal can be used as the detected value of corresponding frequencies component time-domain signal in mains voltage signal.In the phase-locked filter unit structure of the second, because integral feedback is to the attenuation of high fdrequency component, and first converter and the second converter to the modulation and demodulation effect of signal frequency, after phase-locked filtering unit filters process, frequency component corresponding with the frequency component that phase-locked filter unit detects in the input signal of phase-locked filter unit keeps, other frequency component decays, and filtering signal can be used as the detected value of corresponding frequencies component time-domain signal in mains voltage signal.
In embodiments of the present invention, N number of frequency component in N number of phase-locked filter unit difference detection of grid voltage signal is set, to each phase-locked filter unit, the filtering signal that other N-1 phase-locked filter unit exports by first adder is added the feed-forward signal obtaining this phase-locked filter unit, and mains voltage signal is deducted the input signal that feed-forward signal obtains this phase-locked filter unit by the first subtracter.Because in mains voltage signal, other N-1 frequency component is offset by feed-forward signal, each phase-locked filter unit improves the accuracy of detection of corresponding frequencies component phase in mains voltage signal.Meanwhile, due to the interference reduction in input signal, in phase-locked filter unit, pll controller bandwidth can suitably improve, thus improves the response speed of phase-detection.Especially, when frequency component each in mains voltage signal all arranges the phase-locked filter unit of corresponding frequencies, during stable state, each phase-locked filter unit can distinguish the phase place of corresponding frequencies component in error free detection of grid voltage signal.In practical application, by arranging the phase-locked filter unit of the relatively large component corresponding frequencies of content in line voltage, each phase-locked loop accuracy of detection can be made to meet the demands.The method can suppress negative sequence component and harmonic inhabitation component is phase-locked on positive sequence component largely impact completely, and the phase place of positive and negative sequence first-harmonic and harmonic component in line voltage can be extracted, fast response time simultaneously, the control for grid-connected converter provides reliable electric network voltage phase benchmark.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1., based on a cross-linked multiband phase-lock technique, it is characterized in that, comprise the steps:
By and the filtering process phase-locked through N number of phase-locked filter unit respectively of N number of second input signal, obtain N number of phase signal and N number of filtering signal;
To each phase-locked filter unit, the filtering signal exported by other N-1 phase-locked filter unit is added, and obtains the feed-forward signal of this phase-locked filter unit, obtains N number of feed-forward signal altogether;
First input signal is deducted N number of feed-forward signal respectively, obtains N number of described second input signal;
Described first input signal is line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is less than or equal to the number of described first input signal frequency components;
The acquisition methods of described filtering signal is specially:
(1) error signal obtains d axle component and q axle component after the Park conversion under phase-locked loop coordinate system;
(2) after described d axle component and described q axle component being carried out integration respectively, then carry out Park inverse transformation and obtain described filtering signal;
(3) described second input signal deducts described filtering signal, obtains described error signal.
2. multiband phase-lock technique as claimed in claim 1, it is characterized in that, described phase-locked filter unit obtains phase signal by phase-locked loop; Described N number of phase-locked filter unit is respectively the rated frequency of the N number of frequency component in the first input signal by arranging the initial given frequency of phase-locked loop, each phase-locked filter unit is detected respectively component that rated frequency in the first input signal equals the initial given frequency of phase-locked loop; The N number of phase signal export N number of phase-locked filter unit and N number of filtering signal are as the detected value of corresponding frequencies component phase in the first input signal and time-domain signal.
3. multiband phase-lock technique as claimed in claim 1, it is characterized in that, the acquisition methods of described filtering signal is specially:
(1) by described second input signal through under phase-locked loop coordinate system Park conversion after, obtain d axle component and q axle component;
(2) after described d axle component and described q axle component being carried out low-pass filtering respectively, then carry out Park inverse transformation and obtain described filtering signal.
4. realize a system for the multiband phase-lock technique described in any one of claim 1-3, it is characterized in that, comprise N number of first subtracter, N number of phase-locked filter unit and N number of first adder;
The first input end of each subtracter connects the 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 the first input signal is deducted feed-forward signal and obtains the second input signal;
N number of phase-locked filter unit detects the N number of frequency component in the first input signal respectively, each phase-locked filter unit carries out phase-locked and filtering process to described second input signal, and export phase signal and filtering signal, respectively as the detected value of corresponding frequencies component phase and time-domain signal in the first input signal;
Each adder has N-1 input, connect the filtering signal that other N-1 phase-locked filter unit exports respectively, adder output is connected to the second input of a subtracter, each adder is used for the filtering signal summation exported by other N-1 phase-locked filter unit, obtains the feed-forward signal of a phase-locked filter unit;
Described first input signal is line voltage input signal; Described second input signal is the input signal of described phase-locked filter unit; N is less than or equal to the number of described first input signal frequency components;
Described phase-locked filter unit comprises: the second subtracter connected successively, the first converter, first integrator and the second converter, and phase-locked loop;
Second subtracter first input end connects the second input signal, and the second input connects filtering signal, and subtracter is used for described second input signal to deduct filtering signal, obtains error signal;
First converter is used for the Park conversion described error signal carried out under phase-locked loop coordinate system, obtains d axle component and q axle component;
First integrator, for described d axle component and described q axle component are carried out integral processing respectively, and exports the signal after integration;
Second converter, for the signal after integration being carried out the Park inverse transformation under phase-locked loop coordinate system, obtains the filtering signal under rest frame;
Phase-locked loop, input is connected to the q axle component output terminal of described first converter, the phase place that described phase-locked loop exports is as the phase reference of the coordinate transform of described first converter and described second converter, described phase-locked loop for detecting the phase place of described second input signal, as the detected value of corresponding frequencies component phase in described first input signal.
5. system as claimed in claim 4, it is characterized in that, described phase-locked filter unit comprises: the first converter connected successively, low pass filter and the second converter and phase-locked loop;
First converter is used for the Park conversion carried out by described second input signal under phase-locked loop coordinate system, obtains d axle component and q axle component;
Low pass filter, for described d axle component and described q axle component are carried out low-pass filtering treatment respectively, and the signal after output filtering;
Second converter, for filtered signal being carried out the Park inverse transformation under phase-locked loop coordinate system, obtains the filtering signal under rest frame;
Phase-locked loop, input is connected to the q axle component output terminal of described first converter, the phase place that described phase-locked loop exports is as the phase reference of the coordinate transform of described first converter and described second converter, described phase-locked loop for detecting the phase place of described second input signal, as the detected value of corresponding frequencies component phase in the first input signal.
6. system as claimed in claim 5, it is characterized in that, described phase-locked loop comprises: the controller connected successively, second adder and second integral device;
Controller, input is connected to the q axle component that described first converter exports, and described controller is used for phase-locked loop frequency according to the size adjustment of the q axle component of described first converter output, obtains 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 initial given frequency of the frequency of described phase-locked loop adjustment component and described phase-locked loop to sue for peace, 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 the first input signal of described phase-locked filter unit detection;
Second integral device is used for described phase-locked loop frequency to carry out integration, obtains the phase place of described phase-locked loop.
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| CN101673952A (en) * | 2009-08-14 | 2010-03-17 | 燕山大学 | Precise phase locking method based on cross decoupling self-adaptive complex filter |
| CN101820281A (en) * | 2010-04-15 | 2010-09-01 | 西安交通大学 | Single-phase phase locked loop based on double-park transformation phase discriminator and implement method thereof |
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| CN101009430A (en) * | 2006-01-10 | 2007-08-01 | 通用电气公司 | Apparatus, method and computer program product for tracking information in an electric grid |
| CN101673952A (en) * | 2009-08-14 | 2010-03-17 | 燕山大学 | Precise phase locking method based on cross decoupling self-adaptive complex filter |
| CN101820281A (en) * | 2010-04-15 | 2010-09-01 | 西安交通大学 | Single-phase phase locked loop based on double-park transformation phase discriminator and implement method thereof |
| CN101893651A (en) * | 2010-06-18 | 2010-11-24 | 上海理工大学 | Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system |
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