CN104967443A - Single-phase frequency self-adaptive genlock system having pre-filtering function - Google Patents

Abstract

Disclosed is a single-phase frequency self-adaptive genlock system having a pre-filtering function. The single-phase frequency self-adaptive gunlock system comprises an orthogonal signal generator based on a first-order complex integrator, a plurality of first-order complex integrator cascade units and a frequency self-adaptive controller which are connected in sequence. An input end of the orthogonal signal generator based on the first-order complex integrator is connected with a power grid voltage sampling signal. An output end of the frequency self-adaptive controller constitutes the output end of the system, and outputs frequency information of the power grid voltage sampling signal. Meanwhile, the output end of the frequency self-adaptive controller also feeds back the outputted frequency information of the power grid voltage sampling signal to the orthogonal signal generator based on the first-order complex integrator and the plurality of first-order complex integrator cascade units. The invention achieves the virtual orthogonal voltage reconstruction, effectively eliminates the impacts brought by DC noises mixed in sampling power grid voltage, can suppress the harmonics in the sampling signal, and the frequency self-adaptive controller eliminates the impacts of the power grid amplitude change on the frequency adjustment dynamic response speed.

Description

A kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function

Technical field

The present invention relates to a kind of genlock system.Particularly relate to a kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function.

Background technology

Consider many powerful advantages such as novel renewable energy cleanliness without any pollution and rich reserves; the renewable alternative energy source of Development of Novel, improves clean electric power supply, takes a long view; no matter improve in technology, environmental protection, or all will have substantial promotion meaning in economic development etc.

The distributed generation system got up with the leading type such as solar energy, wind energy Renewable Energy Development is intended to for user provides high-quality, clean, dynamical electric power resource.In order to realize the reliability service of distributed grid-connected electricity generation system, need for the powerful sane technical support of its configuration.The cutting-in control that can be inverter due to genlock technology provides required phase reference, and therefore this technology has become distributed new electricity generation system and to be incorporated into the power networks one of the most basic technical requirement.

Traditional genlock structure as shown in Figure 1.Operation principle can be sketched and be: the component of voltage v of line voltage first under corresponding conversion obtains two-phase static α β coordinate system _αand v _β, then obtain the component of voltage v under two-phase rotation dq coordinate system by Park conversion _d.V _dafter pi regulator modulation, Output rusults and power network compensation frequencies omega _ffsuperposition, stack result, through the integral action of voltage controlled oscillator (VCO), finally obtains the phase information of electrical network.With three phase network system unlike, the component of voltage v under α β coordinate system cannot be obtained by Clarke conversion due to single-phase electrical network _αand v _β, orthogonal signal generator (QSG) can only be passed through and produce required two-phase virtual voltage.

Consider under actual condition, non-linear electric load in distributed grid-connected electricity generation system easily produces comparatively outstanding harmonic pollution to electrical network, in addition the unusual condition such as voltage magnitude sudden change, harmonic distortion, frequency hopping existed in utility network, and at the DC noise of sampling to line voltage and may introduce in digital and analogue signals transfer process, power quality problem during precision and the new-energy grid-connected of genlock all will be had influence on.Very few on the research of the phase-locked scheme of phase synchronization under DC noise impact in existing scheme.In existing comparatively advanced method, mean value error penalty method and separation of variables eliminate the impact of DC noise on genlock to a certain extent, but above two kinds of methods are slightly aobvious inferior in phase-locked precision and operand and real-time.Therefore, study and define a kind of novel Fast synchronization phase-lock technique effectively can eliminated DC noise impact and effectively suppress to have subharmonic, to new energy grid-connected power system, there is important actual application value and theory directive significance.

Because single phase system generally produces two-phase virtual voltage by orthogonal signal generator, therefore, the service behaviour of orthogonal signal generator directly affects the precision even determining genlock.For unavoidable DC noise and have subharmonic in sampling line voltage, desirable QSG should have direct current de-noising ability, the undamped extractability of fundamental frequency signal simultaneously and have subharmonic rejection ability.But in traditional genlock structure, there is no the unification of more than realization three kinds of abilities.In addition, consider unforeseen parameter sudden change in actual electric network environment, genlock structure also should possess the rapidity to the electrical network parameter stronger robustness of sudden change and frequency adjustment.

Summary of the invention

Technical problem to be solved by this invention is, provides a kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function.

The technical solution adopted in the present invention is: a kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function, include the orthogonal signal generator based on single order complex integrator be connected in series successively, many single orders complex integrator concatenation unit and frequency self-adaption controller, wherein, the input of the described orthogonal signal generator based on single order complex integrator connects line voltage sampled signal, the output of the output construction system of described frequency self-adaption controller, export the frequency information of line voltage sampled signal, simultaneously, the frequency information of the line voltage sampled signal of output is also fed back to orthogonal signal generator based on single order complex integrator and many single orders complex integrator concatenation unit by the output of described frequency self-adaption controller respectively.

The described orthogonal signal generator based on single order complex integrator includes the differentiator be connected in series successively, first adder, first amplifier, second adder, first integrator, all-pass filter, wherein, the input of differentiator connects line voltage sampled signal, the output of described first integrator forms the first via output based on the orthogonal signal generator of single order complex integrator, connect a road input of many single orders complex integrator concatenation unit, the output polarity of described first integrator also connects first adder after getting and bearing, the output of described all-pass filter by the second amplifier amplify again polarity is got negative after connect second adder, the output of described all-pass filter also forms the second road output of the orthogonal signal generator based on single order complex integrator, connect another road input of many single orders complex integrator concatenation unit.

Described many single orders complex integrator concatenation unit is connected in series successively by the single order complex integrator that m structure is identical to form, wherein m be greater than 1 integer, described single order complex integrator includes the 3rd adder be connected in series successively, 3rd amplifier, 4th adder and second integral device, and the 6th adder be connected in series successively, 6th amplifier, slender acanthopanax musical instruments used in a Buddhist or Taoist mass and third integral device, wherein, the input of the 3rd described adder connects the output based on the all-pass filter in the orthogonal signal generator of single order complex integrator, the input of described 6th adder connects the output based on the first integrator in the orthogonal signal generator of single order complex integrator, the output of described second integral device divides three tunnels, one road forms the first output and connects input corresponding to next stage, second tunnel connects the input of the 4th amplifier, 3rd tunnel polarity gets negative rear connection the 3rd adder, the output polarity of the 4th amplifier gets negative rear connection slender acanthopanax musical instruments used in a Buddhist or Taoist mass, the output of described third integral device divides three tunnels, one road forms the second output and connects input corresponding to next stage, second tunnel connects the 4th adder by the 5th amplifier, 3rd tunnel polarity gets negative rear connection the 6th adder.

Described frequency self-adaption controller includes the first multiplier that input connects the second road output of m single order complex integrator and the first via output of m-1 single order complex integrator in many single orders complex integrator concatenation unit respectively, input connects the second multiplier of the first via output of m single order complex integrator and the second road output of m-1 single order complex integrator in many single orders complex integrator concatenation unit respectively, and input connects the voltage compensator of the two-way output of m single order complex integrator in many single orders complex integrator concatenation unit, also comprise the 7th adder be connected in series successively simultaneously, 7th amplifier, 3rd multiplier and the 4th integrator, wherein, the output that output and the polarity of the first described multiplier get the second negative multiplier is connected the 7th adder jointly, the output of described 7th adder connects the 3rd multiplier by the 7th amplifier, the output of described voltage compensator connects the 3rd multiplier, the output of described 3rd multiplier connects the 4th integrator, the output of described 4th integrator forms the output with the single phase frequency adaptive synchronicity phase-locked system of pre-filtering function.

A kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function of the present invention, has following technique effect:

(1) by the orthogonal signal generator based on single order complex integrator (FOPI-QSG) in the present invention, realizing in virtual orthographic voltage reconstruction process, effectively eliminating the impact being mixed into the DC noise in sampling line voltage and bringing.

(2) realizing in virtual orthographic voltage reconstruction process, FOPI-QSG self can suppress there is subharmonic in sampled signal to a certain extent.

(3) the multiple FOPI unit of cascade after FOPI-QSG, can suppress each harmonic content in virtual orthographic voltage further, and to fundamental frequency signal without any attenuation.

(4) frequency self-adaption controller eliminates the impact of electrical network amplitude change on frequency adjustment dynamic responding speed.

Accompanying drawing explanation

Fig. 1 is traditional genlock structured flowchart;

Fig. 2 is the single phase frequency adaptive synchronicity phase-locked system block diagram with pre-filtering function of the present invention;

Fig. 3 is the expansion block diagram with the single phase frequency adaptive synchronicity phase-locked system of pre-filtering function of the present invention;

Fig. 4 is the formation block diagram based on the orthogonal signal generator of single order complex integrator in the present invention;

Fig. 5 is the formation block diagram of single order complex integrator in the present invention;

Fig. 6 is the formation block diagram of medium frequency adaptive controller of the present invention;

Fig. 7 a is containing line voltage analogous diagram during DC noise;

Fig. 7 b is the two-phase virtual orthographic voltage v containing reconstructing during DC noise _αand v _βanalogous diagram;

Fig. 8 a is containing line voltage analogous diagram during harmonic wave;

Fig. 8 b is the two-phase virtual orthographic voltage v containing reconstructing during harmonic wave _αand v _βanalogous diagram;

Fig. 9 a be containing during harmonic wave to the spectrum analysis figure of line voltage;

Fig. 9 b be containing during harmonic wave to reconstruct voltage v _αand v _βspectrum analysis figure;

Figure 10 a is the degree of decay analogous diagram of FOPI-QSG to each harmonic component in line voltage;

To the degree of decay analogous diagram of each harmonic component in line voltage when Figure 10 b is FOPI-QSG cascade 1 FOPI;

To the degree of decay analogous diagram of each harmonic component in line voltage when Figure 10 c is FOPI-QSG cascade 2 FOPI;

Figure 11 is not containing the frequency self-adaption adjustment dynamic response curve figure of voltage compensator;

Figure 12 is the frequency self-adaption adjustment dynamic response curve figure containing voltage compensator.

Embodiment

Below in conjunction with implementation process and accompanying drawing, a kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function of the present invention is described in detail.

A kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function of the present invention, setting up based on FOPI (single order complex integrator), is the genlock scheme of the complete set be applicable in single phase system.The program mainly contains three plates: 1. FOPI-QSG (orthogonal signal generator based on single order complex integrator); 2. many FOPI concatenation unit; 3. frequency self-adaption controller.In whole genlock scheme, above-mentioned three plates are connected in series successively.

As Fig. 2, shown in Fig. 3, a kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function of the present invention, include the orthogonal signal generator 1 based on single order complex integrator be connected in series successively, many single orders complex integrator concatenation unit 2 and frequency self-adaption controller 3, wherein, the input of the described orthogonal signal generator 1 based on single order complex integrator connects line voltage sampled signal, the output of the output construction system of described frequency self-adaption controller 3, export the frequency information of line voltage sampled signal, simultaneously, the frequency information of the line voltage sampled signal of output is also fed back to orthogonal signal generator 1 based on single order complex integrator and many single orders complex integrator concatenation unit 2 by the output of described frequency self-adaption controller 3 respectively.

As Fig. 3, shown in Fig. 4, the described orthogonal signal generator 1 based on single order complex integrator includes the differentiator 11 be connected in series successively, first adder 12, first amplifier 13, second adder 14, first integrator 15 and all-pass filter 16, wherein, the input of differentiator 11 connects line voltage sampled signal, the output of described first integrator 15 also forms the first via output of the orthogonal signal generator 1 based on single order complex integrator, this output also connects a road input of many single orders complex integrator concatenation unit 2 simultaneously, the output polarity of described first integrator 15 also connects first adder 12 after getting and bearing, the output of described all-pass filter 16 by the second amplifier 17 amplify again polarity is got negative after connect second adder 14, the output of described all-pass filter 16 also forms the second road output of the orthogonal signal generator 1 based on single order complex integrator, this output connects another road input of many single orders complex integrator concatenation unit 2.

The building process of FOPI-QSG:

(1) structure of complex factor j in the transfer function of FOPI-QSG and FOPI transfer function

In the present invention, set up novel FOPI-QSG structure based on formula (1), object is the two-phase virtual orthographic voltage needed for the single-phase mains voltage signal generation genlock scheme of input.The advantage of such orthogonal signal generator (QSG) is, it not only can eliminate the DC noise of input signal completely, also can weaken output signal (i.e. v with identical attenuation coefficient to a certain extent simultaneously _αand v _β) in harmonic content, in addition, such QSG can not damage the fundamental component in desired signal.

$\left\{\begin{array}{c}{V}_{\mathrm{\β}}\left(s\right)=\frac{s}{{\mathrm{\ω}}_o}\·\mathrm{FOPI}\left(s\right)\·V_g\left(s\right)\\ V_{\mathrm{\α}}\left(s\right)=\frac{{\mathrm{\ω}}_o-s}{{\mathrm{\ω}}_o+s}{V}_{\mathrm{\β}}\left(s\right)\end{array}\right.---\left(1\right)$

In formula (1), FOPI (s) represents the transfer function of single order complex integrator, and expression is such as formula shown in (2).

$\mathrm{FOPI}\left(s\right)=\frac{{\mathrm{\ω}}_p}{s-j{\mathrm{\ω}}_o+{\mathrm{\ω}}_p}---\left(2\right)$

In superincumbent formula (1) and formula (2), ω _oand ω _prepresent centre frequency and the cut-off frequency of FOPI and FOPI-QSG respectively.This type of integrator can extract the frequency signal of specifying arbitrarily with carrying out undamped zero phase-shift (i.e. harmless extraction) to adopt the reason of FOPI to be.And to the signal of other frequencies by the amplitude attenuation that has in various degree and phase deviation.

That considers QSG is input as monophasic pulses, directly cannot be completed the structure of complex factor j in cross-linked mode by two phase voltages, therefore in the FOPI-QSG structure shown in Fig. 4, introduce the all-pass filter (APF) of regulable center frequency especially, for according to existing voltage signal v _βproduce an orthogonal with it voltage v _α, at v _αand v _βbasis on, then the structure of single order complex integrator complex factor j under single-phase initial conditions can be realized by cross-linked mode, also complete the structure of FOPI-QSG simultaneously.

(2) FOPI frequency domain transfer function magnitude-phase characteristics equation

For making discussion clear, first give the magnitude-phase characteristics functional relation of FOPI, shown in (3).

$\left\{\begin{array}{c}H=\left|\mathrm{FOPI}\left(\mathrm{j\ω}\right)\right|=\frac{{\mathrm{\ω}}_p}{\sqrt{{{\mathrm{\ω}}_p}^2+{(\mathrm{\ω}-{\mathrm{\ω}}_o)}^2}}\\ P=\∠\mathrm{FOPI}\left(\mathrm{j\ω}\right)=-\arcsin \frac{\mathrm{\ω}-{\mathrm{\ω}}_o}{\sqrt{{{\mathrm{\ω}}_p}^2+{(\mathrm{\ω}-{\mathrm{\ω}}_o)}^2}}\end{array}\right.---\left(3\right)$

(3) elaboration of DC noise operation principle is eliminated

By v _αand v _βin alternating current component and DC component discussed respectively.Specifically, v _α, v _βin alternating current component, i.e. v _{α ac}and v _{β ac}, can from single-phase mains voltage v _gdC component in obtain by FOPI-QSG, its result can be described as

$\left\{\begin{array}{c}{v}_{\mathrm{\βac}}=\frac{\mathrm{\ω}}{{\mathrm{\ω}}_o}(1+{\mathrm{\Δ}}_g){\mathrm{HV}}_m\sin ({\mathrm{\θ}}_g+P+\frac{\mathrm{\π}}{2})\\ v_{\mathrm{\αac}}=\frac{\mathrm{\ω}}{{\mathrm{\ω}}_o}(1+{\mathrm{\Δ}}_g){\mathrm{HV}}_m\sin ({\mathrm{\θ}}_g+P+\frac{\mathrm{\π}}{2}-2\arctan \frac{\mathrm{\ω}}{{\mathrm{\ω}}_o})\end{array}\right.---\left(4\right)$

Consider that DC component can be considered that frequency is the alternating current component of zero, therefore, the v obtained by FOPI-QSG _αand v _βin DC component can be described as

$\left\{\begin{array}{c}{v}_{\mathrm{\βdc}}=\frac{j0}{{\mathrm{\ω}}_o}\·\frac{{\mathrm{\ω}}_p}{j0-j{\mathrm{\ω}}_o+{\mathrm{\ω}}_p}{v}_{\mathrm{gdc}}=0\\ v_{\mathrm{\αdc}}=v_{\mathrm{\βdc}}=0\end{array}\right.---\left(5\right)$

According to superposition theorem, formula (4) is added with formula (5), then by component of voltage v that FOPI-QSG reconstructs _αand v _βcan be described as

$\left\{\begin{array}{c}{v}_{\mathrm{\β}}=\frac{\mathrm{\ω}}{{\mathrm{\ω}}_o}(1+{\mathrm{\Δ}}_g){\mathrm{HV}}_m\sin ({\mathrm{\θ}}_g+P+\frac{\mathrm{\π}}{2})\\ v_{\mathrm{\α}}=\frac{\mathrm{\ω}}{{\mathrm{\ω}}_o}(1+{\mathrm{\Δ}}_g){\mathrm{HV}}_m\sin ({\mathrm{\θ}}_g+P+\frac{\mathrm{\π}}{2}-2\arctan \frac{\mathrm{\ω}}{{\mathrm{\ω}}_o})\end{array}\right.---\left(6\right)$

As can be seen from formula (6), the component of voltage of reconstruct has following feature:

1). reconstruction result depends on the centre frequency ω of FOPI-QSG _o.If this centre frequency equals actual electrical network fundamental frequency, i.e. ω _o=ω, so formula (6) can abbreviation be

$\left\{\begin{array}{c}{v}_{\mathrm{\β}}=(1+{\mathrm{\Δ}}_g){\mathrm{HV}}_m\cos ({\mathrm{\θ}}_g+P)\\ v_{\mathrm{\α}}=(1+{\mathrm{\Δ}}_g){\mathrm{HV}}_m\sin ({\mathrm{\θ}}_g+P)\end{array}\right.---\left(7\right)$

2). further, at ω _ounder the condition that=ω sets up, consider that H and P in formula (3) equals 1 and 0 respectively, so formula (7) can abbreviation be again

$\left\{\begin{array}{c}{v}_{\mathrm{\α}}=(1+{\mathrm{\Δ}}_g)V_m\sin {\mathrm{\θ}}_g\\ v_{\mathrm{\β}}=(1+{\mathrm{\Δ}}_g)V_m\cos {\mathrm{\θ}}_g\end{array}\right.---\left(8\right)$

From formula (8), should find: as the centre frequency ω of FOPI _owhen being consistent with electrical network fundamental frequency ω, the reconstruct component of voltage v produced by FOPI-QSG _αand v _βin do not comprise any DC noise, that is, they are completely orthogonal.In addition, quadrature voltage v _α, v _βamplitude consistent with the amplitude preservation of line voltage alternating current component.

As Fig. 2, shown in Fig. 5, described many single orders complex integrator concatenation unit 2 is connected in series successively by the single order complex integrator that m structure is identical to form, wherein m be greater than 1 integer, described single order complex integrator includes the 3rd adder 21 be connected in series successively, 3rd amplifier 22, 4th adder 23 and second integral device 24, and the 6th adder 210 be connected in series successively, 6th amplifier 29, slender acanthopanax musical instruments used in a Buddhist or Taoist mass 28 and third integral device 27, wherein, the input of the 3rd described adder 21 connects the output based on the all-pass filter 16 in the orthogonal signal generator 1 of single order complex integrator, the input of described 6th adder 210 connects the output based on the first integrator 15 in the orthogonal signal generator 1 of single order complex integrator, the output of described second integral device 24 divides three tunnels, one road forms the first output and connects input corresponding to next stage, second tunnel connects the input of the 4th amplifier 25, 3rd tunnel polarity gets negative rear connection the 3rd adder 21, the output polarity of the 4th amplifier 25 gets negative rear connection slender acanthopanax musical instruments used in a Buddhist or Taoist mass 28, the output of described third integral device 27 divides three tunnels, one road forms the second output and connects input corresponding to next stage, second tunnel connects the 4th adder 23 by the 5th amplifier 26, 3rd tunnel polarity gets negative rear connection the 6th adder 210.

(1) be given in the structure of FOPI under α β coordinate system, and the realization of complex factor j is described

Under α β coordinate system, single order complex integrator realize block diagram as shown in Figure 5.

In Fig. 5, m is the cascade number of FOPI in many FOPI concatenation unit, v _{α, m-1}, v _{β, m-1}and v _{α m}, v _{β m}represent the output of m-1 FOPI and m FOPI respectively, meanwhile, v _{α, m-1}, v _{β, m-1}it is again the input of m FOPI.

The realization of FOPI is herein based upon existing two-phase orthogonal signal v _αand v _βon basis, there is difference in form with the implementation procedure shown in Fig. 4.Particularly, in Figure 5, complex factor j interlocks to be coupled by existing two-phase quadrature voltage and realizes, and in the diagram, j constructs a virtual voltage amount only there is the all-pass filter first through a regulable center frequency on single-phase input voltage basis, and then realized by staggered coupling.Although there is difference in way of realization, from fact, two kinds of implementation methods communicate.

The dynamic property of FOPI and cut-off frequency ω _pvalue relevant.FOPI has following performance: (1) no matter cut-off frequency ω _pget what value, FOPI all can extract the center frequency signal of specifying arbitrarily with carrying out undamped zero phase-shift; (2) ω _palthough good dynamic response performance can be realized when value is excessive, limit self to the decay having subharmonic, be unfavorable for harmonics restraint.As cut-off frequency ω _pfor during electrical network fundamental frequency doubly, can ensure that FOPI has good dynamic response performance and frequency selective characteristic.

(2) be given under centre frequency equals electrical network fundamental frequency situation, suggest plans to the inhibitory action of mains by harmonics

For the ease of analyzing, be ω by the frequency representation of harmonic wave _n=n ω, n=2,3 ..., wherein, n is harmonic number.When the centre frequency of single order complex integrator equals actual electrical network fundamental frequency, this integrator can be expressed as the degree of decay of each harmonic in electrical network

$\begin{array}{c}{\mathrm{FOPI}}_n=\left|\mathrm{FOPI}\left(j{\mathrm{\ω}}_n\right)\right|=\frac{\sqrt{2}\mathrm{\ω}}{2\sqrt{{(\sqrt{2}\mathrm{\ω}/2)}^2+{(\mathrm{n\ω}-\mathrm{\ω})}^2}}\\ =\frac{1}{\sqrt{2{(n-1)}^2+1}}\end{array}---\left(9\right)$

FOPI-QSG is to self output voltage v _αand v _βin the degree of decay of harmonic wave can be expressed as

${\mathrm{FOPI}-\mathrm{QSG}}_n=\frac{n}{\sqrt{2{(n-1)}^2+1}}---\left(10\right)$

To each harmonic attenuating curve when giving FOPI-QSG and cascade FOPI thereof in Figure 10 a, Figure 10 b and Figure 10 c, can clearly find from effect curve, FOPI-QSG only has good attenuation to high-frequency harmonic, and to low-frequency harmonics, especially the damping capacity of second harmonic and triple-frequency harmonics is then performed poor.As FOPI-QSG cascade FOPI, the attenuation of each harmonic is strengthened to some extent, and along with the increase of FOPI cascade number, attenuating is also more obvious, but fundamental frequency signal is not affected.

As FOPI-QSG cascade m FOPI, the degree of decay of each harmonic calculates by formula (11).

$\mathrm{FOPI}-\mathrm{PL}{L}_n=\frac{n}{{[2{(n-1)}^2+1]}^{\frac{m+1}{2}}}---\left(11\right)$

In actual applications, can according to concrete technical indicator, through type (11) determines the cascade number m of FOPI.

As Fig. 3, shown in Fig. 6, described frequency self-adaption controller 3 includes the first multiplier 31 that input connects the second road output of m single order complex integrator and the first via output of m-1 single order complex integrator in many single orders complex integrator concatenation unit 2 respectively, input connects the second multiplier 32 of the first via output of m single order complex integrator and the second road output of m-1 single order complex integrator in many single orders complex integrator concatenation unit 2 respectively, and input connects the voltage compensator 37 of the two-way output of m single order complex integrator in many single orders complex integrator concatenation unit 2, also comprise the 7th adder 33 be connected in series successively simultaneously, 7th amplifier 34, 3rd multiplier 35, 4th integrator 36, wherein, the output that output and the polarity of the first described multiplier 31 get the second negative multiplier 32 is connected the 7th adder 33 jointly, the output of described 7th adder 33 connects the 3rd multiplier 35 by the 7th amplifier 34, the output of described voltage compensator 37 connects the 3rd multiplier 35, the output of described 3rd multiplier 35 connects the 4th integrator 36, the output of described 4th integrator 36 forms the output with the single phase frequency adaptive synchronicity phase-locked system of pre-filtering function.

Consider the contingent frequency discontinuity situation of electrical network fundamental frequency under actual electric network environment, in order to ensure that the FOPI-QSG in design accurately can realize the reconstruct of virtual orthographic voltage, and many FOPI concatenation unit is to effective suppression of mains by harmonics, just must ensure that centre frequency can adjust in real time according to current electrical network fundamental frequency, the main task of this also frequency self-adaption controller just.

The design frame chart of frequency self-adaption controller as shown in Figure 6.M-1 is respectively with the output voltage of m FOPI unit

$\left\{\begin{array}{c}{v}_{\mathrm{\α},m-1}=H^m{V}_M\sin ({\mathrm{\θ}}_g+\mathrm{mP})\\ v_{\mathrm{\β},m-1}=H^m{V}_M\cos ({\mathrm{\θ}}_g+\mathrm{mP})\end{array}\right.---\left(12\right)$

$\left\{\begin{array}{c}{v}_{\mathrm{\αm}}=H^{m+1}{V}_M\sin [{\mathrm{\θ}}_g+(m+1)P]\\ v_{\mathrm{\βm}}=H^{m+1}{V}_M\cos [{\mathrm{\θ}}_g+(m+1)P]\end{array}\right.---\left(13\right)$

This controller mathematical notation can be by the design frame chart of the frequency self-adaption controller according to Fig. 6

${\stackrel{\·}{\mathrm{\ω}}}_o=\mathrm{\ξ}\·\frac{v_{\mathrm{\α},m-1}{v}_{\mathrm{\βm}}-v_{\mathrm{\αm}}{v}_{\mathrm{\β},m-1}}{v_{\mathrm{\αm}}^2+v_{\mathrm{\βm}}^2}---\left(14\right)$

In formula, ξ is frequency self-adaption regulation coefficient.

Under steady state conditions, i.e. ω=ω _otime, above formula can abbreviation be further

${\stackrel{\·}{\mathrm{\ω}}}_o=\sqrt{2}\mathrm{\ξ}\·\frac{\mathrm{\ω}-{\mathrm{\ω}}_o}{\mathrm{\ω}}---\left(15\right)$

Concrete Dynamic Regulating Process can be described as: as ω > ω _otime, automatically can adjust ω _oit is made linearly to increase; As ω < ω _otime, ω can be adjusted in time again _oit is made linearly to reduce; Work as ω _oω is equaled, ω through self-adaptative adjustment _oremain unchanged.The process of frequency self-adaption adjustment is again the process that phase locking unit exports grid phase self-adjusting simultaneously.

In scheme, measure the quick performance of frequency self-adaption adjustment with the timeconstantτ that formula (16) defines.

$\mathrm{\&tau;}=\frac{\mathrm{\&omega;}}{\sqrt{2}\mathrm{\&xi;}}---\left(16\right)$

According to the mean value of electrical network fundamental frequency and the time constant of setting, frequency self-adaption regulation coefficient can be calculated from formula (16), realize for the design completing frequency self-adaption controller.

A kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function of the present invention:

(1) realizing in virtual orthographic voltage reconstruction process, effectively eliminating the impact being mixed into the DC noise in sampling line voltage and bringing.As according to design, necessary emulation is carried out to the mixing sampled signal of the 220V/50Hz with 10V DC noise.Simulation result shows, and through the setting time of 20ms, can realize the reconstruct of virtual orthographic voltage.In addition, under steady state conditions, the component of voltage v after reconstruct _αand v _βpositive-negative half-cycle is symmetrical separately, and v under stable situation is described _αand v _βin all not containing DC noise, as shown in Fig. 7 a, Fig. 7 b.

(2) realizing in virtual orthographic voltage reconstruction process, FOPI-QSG network self can suppress there is subharmonic in sampled signal to a certain extent.As the electrical network fundamental signal to 220V/50Hz in emulation experiment is filled with the quintuple harmonics of 2% and the seventh harmonic of 1%.The simulation result of voltage reconstruction is as shown in Fig. 8 a, Fig. 8 b, and the simulation result of spectrum analysis is as shown in Fig. 9 a, Fig. 9 b.Known by emulating, through the setting time of 20ms, the reconstruct of virtual orthographic voltage can be realized, also demonstrate that FOPI-QSG network self has certain inhibitory action to the subharmonic that has in sampled signal simultaneously.

(3) after FOPI-QSG network, the multiple FOPI unit of cascade can suppress the harmonic content in virtual orthographic voltage further, and does not have attenuation to fundamental frequency signal.As the emulation experiment by arranging three control groups, namely cascade two FOPI unit after cascade FOPI unit and FOPI-QSG after single FOPI-QSG, FOPI-QSG, analyze three control groups to the damping capacity of each harmonic.Simulation result is respectively as shown in Figure 10 a, Figure 10 b, Figure 10 c.Simulation result shows, more more obvious than the inhibition of other two control groups to the inhibition of each harmonic during cascade two FOPI unit after FOPI-QSG.

(4) the frequency self-adaption controller in Fig. 6 eliminates the impact of electrical network amplitude change on frequency adjustment dynamic responding speed.Reason is that the design of controller with the addition of voltage compensator in realizing.If do not add voltage compensator when design frequency adaptive controller, assuming that again with the change of electrical network amplitude in the process of undergoing mutation in electrical network fundamental frequency, in order to verify the impact of voltage magnitude change on dynamic responding speed in such cases, especially, three control groups are set equally in emulation experiment: 1. voltage magnitude remains constant, 2. voltage magnitude rises to 467V in the t=0.02s moment by 311V, and 3. voltage magnitude drops to 249V in the t=0.02s moment by 311V.In three groups of experiments, all set the t=0.04s moment, electrical network fundamental frequency becomes 35Hz instantaneously from 50Hz.Frequency self-adaption adjustment process as shown in figure 11.Can very clearly see from simulation result, the impact of change on frequency self-adaption adjustment dynamic responding speed of electrical network amplitude is fairly obvious.In order to eliminate this impact, after considering to add voltage compensator in frequency self-adaption controller in figure 6, setting t=0.02s moment line voltage drops to 249V and t=0.045s moment electrical network fundamental frequency by 311V and jumps to 55Hz from 50Hz, and frequency self-adaption adjustment dynamic response curve now as shown in figure 12.As can be seen from simulation result, the frequency self-adaption controller in design can ensure that the dynamic response time that frequency self-adaption adjusts can break away from the impact that electrical network amplitude changes generation, therefore has response speed faster.

Claims (4)

1. one kind has the single phase frequency adaptive synchronicity phase-locked system of pre-filtering function, it is characterized in that, include the orthogonal signal generator based on single order complex integrator (1) be connected in series successively, many single orders complex integrator concatenation unit (2) and frequency self-adaption controller (3), wherein, the input of the described orthogonal signal generator based on single order complex integrator (1) connects line voltage sampled signal, the output of the output construction system of described frequency self-adaption controller (3), export the frequency information of line voltage sampled signal, simultaneously, the frequency information of the line voltage sampled signal of output is also fed back to orthogonal signal generator (1) based on single order complex integrator and many single orders complex integrator concatenation unit (2) by the output of described frequency self-adaption controller (3) respectively.

2. a kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function according to claim 1, it is characterized in that, the described orthogonal signal generator based on single order complex integrator (1) includes the differentiator (11) be connected in series successively, first adder (12), first amplifier (13), second adder (14), first integrator (15), all-pass filter (16), wherein, the input of differentiator (11) connects line voltage sampled signal, the output of described first integrator (15) forms the first via output based on the orthogonal signal generator (1) of single order complex integrator, connect a road input of many single orders complex integrator concatenation unit (2), the output polarity of described first integrator (15) also connects first adder (12) after getting and bearing, the output of described all-pass filter (16) by the second amplifier (17) amplify again polarity is got negative after connect second adder (14), the output of described all-pass filter (16) also forms the second road output of the orthogonal signal generator (1) based on single order complex integrator, connect another road input of many single orders complex integrator concatenation unit (2).

3. a kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function according to claim 1, it is characterized in that, described many single orders complex integrator concatenation unit (2) is connected in series successively by the single order complex integrator that m structure is identical to form, wherein m be greater than 1 integer, described single order complex integrator includes the 3rd adder (21) be connected in series successively, 3rd amplifier (22), 4th adder (23) and second integral device (24), and the 6th adder (210) be connected in series successively, 6th amplifier (29), slender acanthopanax musical instruments used in a Buddhist or Taoist mass (28) and third integral device (27), wherein, the input of the 3rd described adder (21) connects the output based on the all-pass filter (16) in the orthogonal signal generator (1) of single order complex integrator, the input of described 6th adder (210) connects the output based on the first integrator (15) in the orthogonal signal generator (1) of single order complex integrator, the output of described second integral device (24) divides three tunnels, one road forms the first output and connects input corresponding to next stage, second tunnel connects the input of the 4th amplifier (25), 3rd tunnel polarity gets negative rear connection the 3rd adder (21), the output polarity of the 4th amplifier (25) gets negative rear connection slender acanthopanax musical instruments used in a Buddhist or Taoist mass (28), the output of described third integral device (27) divides three tunnels, one road forms the second output and connects input corresponding to next stage, second tunnel connects the 4th adder (23) by the 5th amplifier (26), 3rd tunnel polarity gets negative rear connection the 6th adder (210).

4. a kind of single phase frequency adaptive synchronicity phase-locked system with pre-filtering function according to claim 1, it is characterized in that, described frequency self-adaption controller (3) includes the first multiplier (31) that input connects the second road output of m single order complex integrator and the first via output of m-1 single order complex integrator in many single orders complex integrator concatenation unit (2) respectively, input connects second multiplier (32) of the first via output of m single order complex integrator and the second road output of m-1 single order complex integrator in many single orders complex integrator concatenation unit (2) respectively, and input connects the voltage compensator (37) of the two-way output of m single order complex integrator in many single orders complex integrator concatenation unit (2), also comprise the 7th adder (33) be connected in series successively simultaneously, 7th amplifier (34), 3rd multiplier (35) and the 4th integrator (36), wherein, the output that output and the polarity of described the first multiplier (31) get negative the second multiplier (32) is connected the 7th adder (33) jointly, the output of described 7th adder (33) connects the 3rd multiplier (35) by the 7th amplifier (34), the output of described voltage compensator (37) connects the 3rd multiplier (35), the output of described 3rd multiplier (35) connects the 4th integrator (36), the output of described 4th integrator (36) forms the output with the single phase frequency adaptive synchronicity phase-locked system of pre-filtering function.