CN103872886A - Method, device and application system thereof for obtaining quadrature voltage signals of power grid - Google Patents
Method, device and application system thereof for obtaining quadrature voltage signals of power grid Download PDFInfo
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Abstract
The invention discloses a method, device and application system thereof for obtaining quadrature voltage signals of a power grid. Firstly, bi-order improper integral is carried out on voltage signals of the power grid, first voltage signals identical with the voltage signals of the power grid in phase and middle voltage singles which has a 90-degree difference with the voltage signals of the power grid are obtained, the middle voltage signals comprise direct current components, the bi-order improper integral is carried out on the middle voltage signals again, the direct current components are filtered out, second voltage signals identical with the middle voltage signals in phase are obtained, and due to the fact that the phase difference of the first voltage signals and the middle voltage signals is 90 degrees, the phase difference of the second voltage signals and the first voltage signals is 90 degrees. Therefore, through the method and system, the quadrature voltage signals which have the 90-degree phase difference and do not contain the direct current components can be obtained.
Description
Technical field
The application relates to photovoltaic power generation technology field, more particularly, relates to a kind of acquisition methods, system and application system thereof of quadrature voltage signal of electrical network.
Background technology
In recent years, solar photovoltaic technology and industry have obtained significant progress.An important supplement of the current energy is not only in solar energy power generating, is more considered to new energy technology the most promising on our times.The electric energy that photovoltaic power generation equipment sends is direct current, in the time of access electrical network, needs inverter to be converted into the alternating current identical with electrical network parameter, and combining inverter comprises three-phase grid-connected inverter and single-phase grid-connected inverter.For single-phase grid-connected inverter, the phase place of line voltage, amplitude and frequency are the key messages of its operation, and people utilize phase-locked loop (phase locked loop, PLL) technology to obtain the information such as phase place, amplitude and the frequency of line voltage conventionally.
Have at present the PLL of a lot of different structures and method, the main distinction is the method difference that quadrature voltage produces.For single-phase photovoltaic grid-connected inverter, product be orthogonal simple method of voltage be use one output 1/4th cycle time delay modules, it is responsible for producing the output signal (list of references: Sakamoto S that relative input line voltage first-harmonic phase shift 90 is spent, Izumi T, Yokoyama T, Haneyoshi T.A new method for digital PLL control using estimated quadrature two phase frequency detection[C] .Proceeding of the Power Conversion Conference, Osaka, Japan, 2002.), but this method relies on frequency and the filtering of input voltage signal, effect is poor.Scholar Silva S M proposes a kind of phase-locked (list of references: Silva S M based on Hiblert, Lopes B M, Filho B J C, et al.Performance evaluation of PLL algorithms for single-phase grid-connected systems[C] .Proceeding of the Industry Applications Conference, pp.2259-2263,2004.), this method is calculated relatively and is calculated and mix.Rodriguez professor R proposes two rank improper integral (second order Generalized Integrator (SOGI) phase-locked loop, due to phase-locked effective, aspect distributed power generation, be widely used (list of references: Rodriguez R, Timbus A V, Teodorescu R, et al.Flexible active power control of distributed power generation systemsduring grid faults[J] .IEEE Transactions on Industrial Electronics, 2007, 54 (5): 2583 – 2592.).
Above method has a common shortcoming, causes including DC component in the quadrature voltage signal obtaining because not considering line voltage DC component.And the DC component how effectively suppressing in line voltage is that single-phase grid-connected inverter is locked facies-controlled key issue.
Summary of the invention
In view of this, the application provides a kind of acquisition methods and system of quadrature voltage signal of electrical network, is used in single-phase photovoltaic grid-connected inverter, can effectively suppress the DC component in line voltage.
To achieve these goals, the existing scheme proposing is as follows:
An acquisition methods for the quadrature voltage signal of electrical network, the second voltage signal that described quadrature voltage signal comprises first voltage signal consistent with the phase place of mains voltage signal and spends with described the first voltage signal phase phasic difference 90, is characterized in that, comprising:
Mains voltage signal is carried out to two rank improper integral, obtain the intermediate voltage signal that described the first voltage signal and phase place and the phase phasic difference 90 of described mains voltage signal are spent; Described intermediate voltage signal comprises DC component;
Described intermediate voltage signal is carried out to two rank improper integral again, obtain described second voltage signal.
Preferably, described mains voltage signal is carried out to two rank improper integral, obtains the intermediate voltage signal that described the first voltage signal and phase place and the phase phasic difference 90 of described mains voltage signal are spent, comprising:
Described mains voltage signal is deducted to the first feedback signal;
The described mains voltage signal that deducts described the first feedback signal is amplified by the first preset ratio;
Described mains voltage signal after amplifying is deducted to the second feedback signal;
The described mains voltage signal and the first resonance frequency that deduct described the second feedback signal are multiplied each other;
Described mains voltage signal after multiplying each other with described the first resonance frequency is carried out to integration, obtain described the first voltage signal; Described the first voltage signal is simultaneously also as described the first feedback signal;
Described the first voltage signal and described the first resonance frequency are multiplied each other;
The first voltage signal after multiplying each other with described the first resonance frequency is carried out to integration, obtain described intermediate voltage signal; Described intermediate voltage signal is simultaneously also as described the second feedback voltage signal.
Preferably, described described intermediate voltage signal is carried out to two rank improper integral again, with DC component described in filtering, obtains described second voltage signal, comprising:
Described intermediate voltage signal is deducted to the 3rd feedback signal;
The described intermediate voltage signal that deducts described the 3rd feedback signal is amplified by the second preset ratio;
Described intermediate voltage signal after amplifying is deducted to the 4th feedback signal;
The described intermediate voltage signal and the second resonance frequency that deduct described the 4th feedback signal are multiplied each other;
Described intermediate voltage signal after multiplying each other with described the second resonance frequency is carried out to integration, obtain described second voltage signal; Described second voltage signal is simultaneously also as described the 3rd feedback signal;
Described second voltage signal and described the second resonance frequency are multiplied each other, and carry out integration and obtain described the 4th feedback signal.
An acquisition device for the quadrature voltage signal of electrical network, the second voltage signal that described quadrature voltage signal comprises first voltage signal consistent with the phase place of mains voltage signal and spends with described the first voltage signal phase phasic difference 90, is characterized in that, comprising:
First integral module, for mains voltage signal being carried out to two rank improper integral, obtains the intermediate voltage signal that described the first voltage signal and phase place and the phase phasic difference 90 of described mains voltage signal are spent; Described intermediate voltage signal comprises DC component;
Second integral module, for described intermediate voltage signal being carried out again to two rank improper integral, obtains described second voltage signal.
Preferably, described first integral module comprises:
The first subtracter, for deducting the first feedback signal by described mains voltage signal;
The first proportional amplifier, for amplifying the described mains voltage signal that deducts described the first feedback signal by the first preset ratio;
The second subtracter, for deducting the second feedback signal by the described mains voltage signal after amplifying;
The first multiplier, for multiplying each other the described mains voltage signal and the first resonance frequency that deduct described the second feedback signal;
First integrator, for the described mains voltage signal after multiplying each other with described the first resonance frequency is carried out to integration, and exports described the first voltage signal; Described the first voltage signal is simultaneously also as described the first feedback signal;
The second multiplier, for multiplying each other described the first voltage signal and described the first resonance frequency;
Second integral device, for the first voltage signal after multiplying each other with described the first resonance frequency is carried out to integration, and exports described intermediate voltage signal; Described intermediate voltage signal is simultaneously also as described the second feedback voltage signal.
Preferably, described second integral module comprises:
The 3rd subtracter, for deducting described intermediate voltage signal the 3rd feedback signal;
The second proportional amplifier, for amplifying the described intermediate voltage signal that deducts described the 3rd feedback signal by the second preset ratio;
The 4th subtracter, for deducting the 4th feedback signal by the described intermediate voltage signal after amplifying;
The 3rd multiplier, for multiplying each other the described intermediate voltage signal and the second resonance frequency that deduct described the 4th feedback signal;
Third integral device, for the described intermediate voltage signal after multiplying each other with described the second resonance frequency is carried out to integration, and exports described second voltage signal; Described second voltage signal is simultaneously also as described the 3rd feedback signal;
The 4th multiplier, for multiplying each other described second voltage signal and described the second resonance frequency;
The 4th integrator, for the described second voltage signal after multiplying each other with described the second resonance frequency is carried out to integration, and exports described the 4th feedback signal.
A kind of phase-locked loop, comprises the acquisition device of the quadrature voltage signal of above-described electrical network.
A kind of photovoltaic combining inverter, comprises above-described phase-locked loop.
Can find out from above-mentioned technical scheme, the acquisition methods of the quadrature voltage signal of the disclosed electrical network of the application, device and application system thereof are first mains voltage signal to be carried out to two rank improper integral, obtain first voltage signal consistent with the phase place of mains voltage signal and the intermediate voltage signal of spending with mains voltage signal phase phasic difference 90, this intermediate voltage signal includes DC component, then this intermediate voltage signal is carried out to two rank improper integral again, this DC component of filtering, obtain the second voltage signal consistent with the phase place of this intermediate voltage signal, because the first voltage signal is spent with the phase phasic difference 90 of intermediate voltage signal, be that second voltage signal and the first voltage signal differ 90 degree.Thereby can obtain that phase phasic difference 90 is spent and not containing the quadrature voltage signal of DC component by this acquisition methods and system.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiment of the application, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The flow chart of the acquisition methods of the quadrature voltage signal of a kind of electrical network that Fig. 1 provides for the embodiment of the present application;
The flow chart of the acquisition methods of the quadrature voltage signal of a kind of electrical network that Fig. 2 provides for another embodiment of the application;
The structure chart of the acquisition device of the quadrature voltage signal of a kind of electrical network that Fig. 3 provides for the another embodiment of the application;
The structure chart of the acquisition device of the quadrature voltage signal of a kind of electrical network that Fig. 4 provides for the another embodiment of the application;
The Bode diagram of the acquisition device that Fig. 5 provides for the another embodiment of the application;
The mains voltage signal that Fig. 6 provides for the another embodiment of the application and the oscillogram of the first voltage signal;
The mains voltage signal that Fig. 7 provides for the another embodiment of the application and the oscillogram of second voltage signal.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiment.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
Embodiment mono-
The flow chart of the acquisition methods of the quadrature voltage signal of a kind of electrical network that Fig. 1 provides for the embodiment of the present application.
The acquisition methods of the quadrature voltage signal that as shown in Figure 1, the present embodiment provides comprises the steps:
S101: mains voltage signal is carried out to two rank improper integral.
The mains voltage signal that previous step is obtained is carried out two rank improper integral processing, therefrom obtains and synchronous the first voltage signal of voltage signal, and the intermediate voltage signal of phase place and the phase phasic difference 90 of mains voltage signal.
The intermediate voltage signal obtaining in this step includes DC component.
S102: intermediate voltage signal is carried out to two rank improper integral again.
The intermediate voltage signal that previous step is obtained is double-clicked improper integral again, the DC component wherein comprising with filtering, final acquisition and the synchronous second voltage signal of intermediate voltage signal.
Can find out from technique scheme, first the acquisition methods of the quadrature voltage signal of the electrical network that the present embodiment provides obtains mains voltage signal from the voltage of electrical network; Then mains voltage signal is carried out to two rank improper integral, obtain differing the intermediate voltage signal of 90 degree with the first voltage signal of mains voltage signal homophase with mains voltage signal, but in intermediate voltage signal, comprise DC component; Then intermediate voltage signal is being carried out to two rank improper integral, the DC component wherein comprising is removed, obtain and the synchronous second voltage signal of intermediate voltage signal, thereby finally do not comprised the quadrature voltage signal of DC component from mains voltage signal, i.e. the first voltage letter and second voltage signal that phase phasic difference 90 is spent.
Embodiment bis-
Fig. 2 provides a kind of flow chart of acquisition methods of quadrature voltage signal of electrical network for another embodiment of the application.
As shown in Figure 2, the present embodiment provide the acquisition methods of quadrature voltage signal comprise the steps:
S201: mains voltage signal is deducted to the first feedback signal;
Mains voltage signal in previous step is deducted to the first feedback signal, and this first feedback signal is by obtaining in later step.
S202: the mains voltage signal that deducts the first feedback signal is amplified by preset ratio.
Previous step mains voltage signal after treatment is amplified by the first preset ratio in this link, and magnification ratio is 0.707.
S203: the mains voltage signal after amplifying is deducted to the second feedback signal;
Mains voltage signal after amplifying is deducted to the second feedback signal in this link, and the second feedback signal is obtained by link below.
S204: mains voltage signal is carried out to Frequency mixing processing.
The mains voltage signal and the first resonance frequency that deduct the second feedback signal are multiplied each other, preferably 314.16 hertz of the first resonance frequencys.
S205: mains voltage signal is carried out to integration.
Mains voltage signal after multiplying each other with the first resonance frequency is carried out to integration, obtain the first voltage signal, the phase place of the first voltage signal is identical with the phase place of mains voltage signal.The first voltage signal is simultaneously as the first feedback signal.
S206: the first voltage signal is carried out to Frequency mixing processing.
The first voltage signal and the first resonance frequency are multiplied each other, obtain the first voltage signal after mixing.
S207: the first voltage signal after mixing is carried out to integration.
The first voltage signal after multiplying each other with the first resonance frequency is carried out to integration, thereby obtain intermediate voltage signal, intermediate voltage signal is simultaneously as the second feedback voltage signal, and its phase place and mains voltage signal differ 90 degree, and comprise DC component.
S208: intermediate voltage signal is deducted to the 3rd feedback signal.
S209: intermediate voltage signal is amplified by the second preset ratio.
The intermediate voltage signal that deducts the 3rd feedback signal is amplified to magnification ratio preferably 0.707 by the second preset ratio.
S210: the intermediate voltage signal after amplifying is deducted to the 4th feedback signal.
S211: intermediate voltage signal is carried out to Frequency mixing processing.
The intermediate voltage signal and the second resonance frequency that deduct the 4th feedback signal are multiplied each other, preferably 314.16 hertz of the second resonance frequencys.
S212: intermediate voltage signal is carried out to integration, obtain second voltage signal.
Intermediate voltage signal through Frequency mixing processing is carried out to integration, obtain the second voltage signal that phase place is identical, second voltage signal is simultaneously also as the 3rd feedback signal.Through integral processing, second voltage signal is identical with the phase place of intermediate voltage signal, but DC component is wherein by filtering.
S213: by second voltage signal process Frequency mixing processing.
Second voltage signal and the second resonance frequency are multiplied each other, preferably 314.16 hertz of the second resonance frequencys.
S214: obtain the 4th feedback signal.
Second voltage signal through mixing is carried out to integration again, obtain the 4th feedback signal.
Embodiment tri-
Fig. 3 is the structure chart of the acquisition device of the quadrature voltage signal of the application's a kind of electrical network that embodiment provides again.
As shown in Figure 3, the acquisition device of the quadrature voltage signal that the present embodiment provides comprises first integral module 10 and second integral module 20, and wherein first integral module 10 is connected with second integral module 20.
First integral module 10 is for to mains voltage signal e
gcarry out two rank improper integral processing, therefrom obtain and output and synchronous the first voltage signal V of voltage signal
α, and the intermediate voltage signal V of phase place and the phase phasic difference 90 of mains voltage signal
β 1.The intermediate voltage signal obtaining in this step includes DC component.
The intermediate voltage signal V of second integral module 20 for first integral module 10 is exported
β 1again carry out two rank improper integral, the DC component wherein comprising with filtering, finally obtains and output and the synchronous second voltage signal of intermediate voltage signal V
β.
Can find out from technique scheme, the acquisition device of the quadrature voltage signal of the electrical network that the present embodiment provides comprises first integral module and second integral module, and first integral module is first to mains voltage signal e
gcarry out two rank improper integral, obtain the first voltage signal V with mains voltage signal homophase
αwith differ the intermediate voltage signal V of 90 degree with mains voltage signal
β 1but, intermediate voltage signal V
β 1in comprise DC component; Second integral module is finally to intermediate voltage signal V
β 1carry out two rank improper integral, the DC component wherein comprising is removed, obtain and the synchronous second voltage signal of intermediate voltage signal V
βthereby, the final quadrature voltage signal that is not comprised DC component from mains voltage signal, i.e. the first voltage letter V that phase phasic difference 90 is spent
αwith second voltage signal V
β.
Embodiment tetra-
Fig. 4 is the structure chart of the acquisition device of the quadrature voltage signal of the application's a kind of electrical network that embodiment provides again.
The acquisition device of the quadrature voltage signal that as shown in Figure 4, the present embodiment provides comprises first integral module 10 and second integral module 20.
Wherein first integral module 10 comprises the first subtracter 11, the first proportional amplifier 12, the second subtracter 13, the first multiplier 14, first integrator 15, the second multiplier 16 and second integral device 17, wherein the first subtracter 11 is connected with the first proportional amplifier 12, first integrator 15 respectively, the second subtracter 13 is connected respectively at the first proportional amplifier 12, the first multiplier 14, second integral device 17, first integrator 15 is also connected with the first multiplier 14, the second multiplier 16 respectively, and the second multiplier 16 is also connected with second integral device 17.
The first subtracter 11 is for by mains voltage signal e
gdeduct the first feedback signal.
The first proportional amplifier 12 is for deducting the mains voltage signal e of the first feedback signal
gamplify the first preset ratio preferably 0.707 by the first preset ratio.
The second subtracter 13 for by amplify after mains voltage signal e
gdeduct the second feedback signal.
The first multiplier 14 is for deducting the mains voltage signal e of the second feedback signal
gmultiply each other with the first resonance frequency, preferably 314.16 hertz of the first resonance frequencys.
The second multiplier 16 is for by the first voltage signal V
αmultiply each other with the first resonance frequency.
Second integral device 17 is for by the first voltage signal V after multiplying each other with the first resonance frequency
αcarry out integration, obtain and export intermediate voltage signal V
β 1, intermediate voltage signal V
β 1simultaneously as the second feedback voltage signal.
Second integral module 20 comprises the 3rd subtracter 21, the second proportional amplifier 22, the 4th subtracter 23, the 3rd multiplier 24, third integral device 25, the 4th multiplier 26 and the 4th integrator 27, wherein: the 3rd subtracter 21 is connected with second integral device 17, the second subtracter 13, the second proportional amplifier 22 respectively, the 4th subtracter 23 is connected respectively at the 4th integrator 27, the second proportional amplifier 22, the 3rd multiplier 24, the 3rd multiplier 24 is also connected with third integral device 25, and the 4th multiplier 26 is also connected with the 4th integrator 27.
The 3rd subtracter 21 is for by intermediate voltage signal V
β 1deduct the 3rd feedback signal.
The second proportional amplifier 22 is for deducting the intermediate voltage signal V of the 3rd feedback signal
β 1amplify the second preset ratio preferably 0.707 by the second preset ratio.
The 4th subtracter 23 for by amplify after intermediate voltage signal V
β 1deduct the 4th feedback signal.
The 3rd multiplier 24 is for deducting the intermediate voltage signal V of the 4th feedback signal
β 1multiply each other with the second resonance frequency, preferably 314.16 hertz of the second resonance frequencys.
Third integral device 25 is for by the intermediate voltage signal V after multiplying each other with the second resonance frequency
β 1carry out integration, and export second voltage signal V
β; Second voltage signal V
βsimultaneously also as the 3rd feedback signal.
The 4th multiplier 26 is for by second voltage signal V
βmultiply each other with the second resonance frequency.
The 4th integrator 27 is for by the second voltage signal V after multiplying each other with the second resonance frequency
βcarry out integration, integral result is as the 4th feedback signal.
Can obtain two-stage SOGI closed loop transfer function, (F by Fig. 4
α(s)=V
α(s)/e
g(s), F
β 1(s)=V
β 1(s)/e
g(s), F
β(s)=V
β(s)/e
g(s)) as follows:
Wherein ω
gsOGI nature frequency of oscillation, its result and employing PLL technology export frequencies omega
*equate; K affects the bandwidth of SOGI closed loop transfer function.Get k=0.707, ω
g=314.16, its two-stage SOGI closed loop transfer function, (F
α(s)=V
α(s)/e
g(s), F
β 1(s)=V
β 1(s)/e
g(s), F
β(s)=V
β(s)/e
g(s) Bode diagram) as shown in Figure 5.Find out from the Bode diagram of Fig. 5: in resonance frequency omega
gplace, output voltage signal V
αwith mains voltage signal e
gsame amplitude, phase difference is 0; And output orthogonal voltage signal V
βwith mains voltage signal e
gsame amplitude, phase difference is 90 degree, realizes the generation of orthogonal signalling.Show from the Bode diagram of Fig. 5: once input mains voltage signal e
gthere is DC component, V
β 1with mains voltage signal e
gequally contain DC component, but output voltage signal V
βto input mains voltage signal e
gthere is DC component to have good filter effect, thereby can effectively suppress mains voltage signal e
gdC component.
Suppress line voltage DC component two-stage SOGI structure for realizing Fig. 4, taking digital signal processor TMS320F2808 as core, utilize 12,16 tunnel of Pian Nei AD module to sample to signal acquisition circuit signal.For the ability of verification method inhibition line voltage DC component, in experiment, input mains voltage signal e
gfor: e
g=320sin (314.16t)+30, the DC component that input mains voltage signal is 30V.Fig. 6 is mains voltage signal e
gwith by two-stage SOGI output voltage signal V
αexperimental waveform, Fig. 7 is mains voltage signal e
gwith by two-stage SOGI output voltage signal V
βexperimental waveform.Show from above experimental waveform: pass through invented method output voltage signal V
αwith voltage signal V
βsine degree is good, there is no DC component (even DC component that input mains voltage signal contains 30V), and voltage signal V
βlagging voltage signal V
α90 degree, output voltage signal V
αwith voltage signal V
βorthogonal.
Embodiment five
The present embodiment provides a kind of phase-locked loop, is provided with the quadrature voltage signal acquisition device that above embodiment tri-or embodiment tetra-provide.
Embodiment six
The present embodiment provides a kind of photovoltaic combining inverter, is provided with the phase-locked loop that an embodiment provides.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the application.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the case of not departing from the application's spirit or scope, realize in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. an acquisition methods for the quadrature voltage signal of electrical network, the second voltage signal that described quadrature voltage signal comprises first voltage signal consistent with the phase place of mains voltage signal and spends with described the first voltage signal phase phasic difference 90, is characterized in that, comprising:
Mains voltage signal is carried out to two rank improper integral, obtain the intermediate voltage signal that described the first voltage signal and phase place and the phase phasic difference 90 of described mains voltage signal are spent; Described intermediate voltage signal comprises DC component;
Described intermediate voltage signal is carried out to two rank improper integral again, obtain described second voltage signal.
2. acquisition methods as claimed in claim 1, is characterized in that, described mains voltage signal is carried out to two rank improper integral, obtains the intermediate voltage signal that described the first voltage signal and phase place and the phase phasic difference 90 of described mains voltage signal are spent, and comprising:
Described mains voltage signal is deducted to the first feedback signal;
The described mains voltage signal that deducts described the first feedback signal is amplified by the first preset ratio;
Described mains voltage signal after amplifying is deducted to the second feedback signal;
The described mains voltage signal and the first resonance frequency that deduct described the second feedback signal are multiplied each other;
Described mains voltage signal after multiplying each other with described the first resonance frequency is carried out to integration, obtain described the first voltage signal; Described the first voltage signal is simultaneously also as described the first feedback signal;
Described the first voltage signal and described the first resonance frequency are multiplied each other;
The first voltage signal after multiplying each other with described the first resonance frequency is carried out to integration, obtain described intermediate voltage signal; Described intermediate voltage signal is simultaneously also as described the second feedback voltage signal.
3. acquisition methods as claimed in claim 1, is characterized in that, described described intermediate voltage signal is carried out to two rank improper integral again, with DC component described in filtering, obtains described second voltage signal, comprising:
Described intermediate voltage signal is deducted to the 3rd feedback signal;
The described intermediate voltage signal that deducts described the 3rd feedback signal is amplified by the second preset ratio;
Described intermediate voltage signal after amplifying is deducted to the 4th feedback signal;
The described intermediate voltage signal and the second resonance frequency that deduct described the 4th feedback signal are multiplied each other;
Described intermediate voltage signal after multiplying each other with described the second resonance frequency is carried out to integration, obtain described second voltage signal; Described second voltage signal is simultaneously also as described the 3rd feedback signal;
Described second voltage signal and described the second resonance frequency are multiplied each other, and carry out integration and obtain described the 4th feedback signal.
4. an acquisition device for the quadrature voltage signal of electrical network, the second voltage signal that described quadrature voltage signal comprises first voltage signal consistent with the phase place of mains voltage signal and spends with described the first voltage signal phase phasic difference 90, is characterized in that, comprising:
First integral module, for mains voltage signal being carried out to two rank improper integral, obtains the intermediate voltage signal that described the first voltage signal and phase place and the phase phasic difference 90 of described mains voltage signal are spent; Described intermediate voltage signal comprises DC component;
Second integral module, for described intermediate voltage signal being carried out again to two rank improper integral, obtains described second voltage signal.
5. acquisition device as claimed in claim 4, is characterized in that, described first integral module comprises:
The first subtracter, for deducting the first feedback signal by described mains voltage signal;
The first proportional amplifier, for amplifying the described mains voltage signal that deducts described the first feedback signal by the first preset ratio;
The second subtracter, for deducting the second feedback signal by the described mains voltage signal after amplifying;
The first multiplier, for multiplying each other the described mains voltage signal and the first resonance frequency that deduct described the second feedback signal;
First integrator, for the described mains voltage signal after multiplying each other with described the first resonance frequency is carried out to integration, and exports described the first voltage signal; Described the first voltage signal is simultaneously also as described the first feedback signal;
The second multiplier, for multiplying each other described the first voltage signal and described the first resonance frequency;
Second integral device, for the first voltage signal after multiplying each other with described the first resonance frequency is carried out to integration, and exports described intermediate voltage signal; Described intermediate voltage signal is simultaneously also as described the second feedback voltage signal.
6. acquisition device as claimed in claim 4, is characterized in that, described second integral module comprises:
The 3rd subtracter, for deducting described intermediate voltage signal the 3rd feedback signal;
The second proportional amplifier, for amplifying the described intermediate voltage signal that deducts described the 3rd feedback signal by the second preset ratio;
The 4th subtracter, for deducting the 4th feedback signal by the described intermediate voltage signal after amplifying;
The 3rd multiplier, for multiplying each other the described intermediate voltage signal and the second resonance frequency that deduct described the 4th feedback signal;
Third integral device, for the described intermediate voltage signal after multiplying each other with described the second resonance frequency is carried out to integration, and exports described second voltage signal; Described second voltage signal is simultaneously also as described the 3rd feedback signal;
The 4th multiplier, for multiplying each other described second voltage signal and described the second resonance frequency;
The 4th integrator, for the described second voltage signal after multiplying each other with described the second resonance frequency is carried out to integration, and exports described the 4th feedback signal.
7. a phase-locked loop, is characterized in that, comprises the acquisition device of the quadrature voltage signal of the electrical network as described in claim 4～6 any one.
8. a photovoltaic combining inverter, is characterized in that, comprises phase-locked loop as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127220.0A CN103872886A (en) | 2014-03-31 | 2014-03-31 | Method, device and application system thereof for obtaining quadrature voltage signals of power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127220.0A CN103872886A (en) | 2014-03-31 | 2014-03-31 | Method, device and application system thereof for obtaining quadrature voltage signals of power grid |
Publications (1)
| Publication Number | Publication Date |
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