CN102735938A  Quick detection method of grid voltage fundamental wave positive sequence phase angle  Google Patents
Quick detection method of grid voltage fundamental wave positive sequence phase angle Download PDFInfo
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 CN102735938A CN102735938A CN2012102354482A CN201210235448A CN102735938A CN 102735938 A CN102735938 A CN 102735938A CN 2012102354482 A CN2012102354482 A CN 2012102354482A CN 201210235448 A CN201210235448 A CN 201210235448A CN 102735938 A CN102735938 A CN 102735938A
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Abstract
The invention relates to a quick detection method of a grid voltage fundamental wave positive sequence phase angle, wherein the fundamental wave positive sequence voltage of a grid is obtained through two loops such as a frequency locking loop and a phase locking loop and a phase angle of fundamental wave voltage positive sequence component is extracted from a signal when the frequency of the grid voltage changes and the threephase voltage is asymmetric or distorted. According to the quick detection method of the grid voltage fundamental wave positive sequence phase angle disclosed by the invention, when the frequency of the grid voltage is unstable and the waveform is distorted, the interference of harmonic component and fundamental wave negative sequence component is removed through the frequency locking loop and the phase locking loop, and the phase angle of grid voltage fundamental wave positive sequence component is exactly detected, thus the quick detection method disclosed by the invention not only has high detection precision, but also has quicker dynamic response speed, and can ensure the normal operation of various power electronic devices.
Description
Technical field
The present invention relates to a kind of can be unstable in the line voltage frequency, fast, accurately detect the method for its fundamental voltage positivesequence component phase angle during wave form distortion, belong to the detection technique field.
Background technology
During Operation of Electric Systems, system frequency can change along with the variation of customer charge, so the fundamental frequency of line voltage is easy to receive effects of load and disturbance takes place.Along with the widespread use of power electronic equipment, electric railway and ac arc furnace, the harmonic problem of electrical network, threephase asymmetry problem are serious day by day.In engineering; The fundamental frequency disturbance of line voltage; Harmonic wave and threephase asymmetry can make some devices that need accurately to measure in real time the line voltage phase angle (like the inverter in power distribution network STATCOM (DSTATCOM), the DC transmission system etc.) can't operate as normal.This is because when the threephase voltage wave form distortion; The phase place of the electrical network a phase voltage that obtains with traditional detection method is the coefficient phase place of positive sequence, negative phasesequence, zero sequence and harmonic component by a phase voltage, but not as the phase place of a phase voltage fundamental positive sequence of control benchmark.Therefore, when the threephase voltage wave form distortion, to the voltage fundamental positivesequence component fast, accurately detection just becomes prerequisite and the key that all kinds of power electronic equipments are realized effectively operation control.
Although people have done various improvement to traditional detection method, existing line voltage fundamental positive sequence phaseangle detection method all is difficult to take into account the contradiction between system stability and the dynamic responding speed, is necessary further to explore.
Summary of the invention
The objective of the invention is to overcome prior art deficiency, a kind of method for quick of new line voltage fundamental positive sequence phase angle is provided, to guarantee the normal operation of all kinds of power electronic equipments.
The alleged problem of the present invention realizes with following technical proposals:
A kind of method for quick of line voltage fundamental positive sequence phase angle; Said method is at the line voltage frequency variation; Threephase voltage asymmetric or when distortion; Through the fundamental positive sequence voltage of " frequency locking " and " lock is mutually " two links acquisitions electrical network, from this signal, extract the phase angle of fundamental voltage positivesequence component then, its concrete steps are following:
A. frequency locking
If the line voltage threephase is asymmetric and when distortion, the electrical network threephase voltage is respectively:
，
In the formula: U is a voltage effective value;
is phase angle; First subscript represent the preface component (the 1st, positive sequence; The 2nd, negative phasesequence; The 0th, zero sequence); Second subscript represented overtone order, and
is system's firstharmonic angular frequency
With u
_{a}, u
_{b}, u
_{c}Be converted into the alphabeta coordinate:
，
With u
_{β}Through LPF (lowpass filter) filtering harmonic component, the signal of acquisition obtains the cosine and sine signal with fundamental positive sequence voltage same frequency by PLL (phaselocked loop) locking phase and frequency:
With
, this has just locked the fundamental frequency of line voltage;
B. lock phase
With u
_{α}, u
_{β}With the cosine and sine signal matrix
Multiply each other respectively:
?
?，
Utilize the trigonometric function formula, incite somebody to action firstharmonic negative sequence component cancellation wherein through plus and minus calculation:
，
u
_{α s}u
_{β c}With u
_{α c}u
_{β s}Through LPF elimination AC compounent:
，
Utilize the trigonometric function characteristic to obtain the fundamental voltage positivesequence component:
produces and the synchronous cosine and sine signal of a phase voltage fundamental positive sequence same frequency through phaselocked loop then, and then obtains line voltage fundamental positive sequence phase angle.
The present invention can be unstable in the line voltage frequency; During wave form distortion, through " frequency locking " and " lock is mutually " two interference that link is removed harmonic component and firstharmonic negative sequence component, the phase angle of accurate detection of grid voltage fundamental positivesequence component; Said method not only accuracy of detection is high, and its error is less than 10
^{4}, and dynamic responding speed is very fast, can reach stable again in the half cycles, can guarantee the normal operation of all kinds of power electronic equipments.
Description of drawings
Below in conjunction with accompanying drawing the present invention is made further detailed description.
Fig. 1 adopts this method to carry out the process flow diagram that instruction current calculates;
Fig. 2 is the test pattern of a simulation example of the present invention.
Each symbol is in the literary composition:
, nth harmonic voltage positivesequence component effective value;
, nth harmonic voltage negative sequence component effective value;
, nth harmonic voltage zerosequence component effective value;
, a phase fundamental voltage positivesequence component effective value;
, the initial phase angle of nth harmonic voltage positivesequence component;
, the initial phase angle of nth harmonic voltage negative sequence component;
, the initial phase angle of nth harmonic voltage zerosequence component; N, overtone order;
, angular frequency;
t, the time; u
_{a}, u
_{b}, u
_{c}Be threephase voltage; u
_{α}, u
_{β}Be process
Be converted into the voltage of alphabeta axle; α βdq transformation matrix of coordinates C does
Embodiment
The present invention considers the generality of grid voltage waveform distortion in the engineering when accomplishing the fast detecting of fundamental voltage positivesequence component phase angle, establish threephase voltage u
_{a}, u
_{b}, u
_{c}Be respectively:
，
In the formula: U is a voltage effective value, and first subscript is represented preface component (the 1st, positive sequence, the 2nd, negative phasesequence, the 0th, zero sequence), and second subscript represented overtone order.
The frequency locking link of this paper: with u
_{a}, u
_{b}, u
_{c}, process
，
Be converted into the alphabeta coordinate:
，
With u
_{α}Through LPF filtering harmonic component, the signal of acquisition obtains the cosine and sine signal with fundamental positive sequence voltage same frequency by PLL locking phase and frequency:
With
, this has just locked the fundamental frequency of line voltage.
The phaselocked loop joint of this paper: with u
_{α}, u
_{β}Multiply each other respectively with the cosine and sine signal matrix:
?
?，
Utilize the correlation formula of trigonometric function, will wherein comprise the component cancellation of firstharmonic negative phasesequence information through plus and minus calculation:
，
u
_{α s}u
_{β c}With u
_{α c}u
_{β s}Process LPF elimination AC compounent:
,
Related characteristics through trigonometric function obtains the fundamental voltage positivesequence component:
obtained the line voltage fundamental positive sequence through " lock phase " link.
Below provide a simulation example and verify effect of the present invention.
Utilize the Simulink tool box of Matlab to set up the realistic model of threephase fourwire system power distribution network.Wherein, the substation transformer model is by voltage source and the common formation of substation transformer impedance (R+jX=3+j0.04 Ω); Nonlinear outofbalance load by the nonlinear partial (R1+jX1=18+ j0.03 Ω) that inserts electrical network through threephase commutation bridge with insert through singlephase rectification bridge that B outofbalance load (R2+jX2=25+j0.005 Ω) mutually is common to be constituted; Line impedance is 3mH.
Utilize phaselocked loop and detection method of the present invention to carry out the emulation experiment of network voltage detection respectively, it is as shown in Figure 2 to obtain the result.Can see that from Fig. 2 the phase place of line voltage is by the coefficient phase place of the positive sequence of a phase voltage, negative phasesequence, zero sequence and harmonic component, have phase differential with the phase place of a phase voltage fundamental positive sequence as the control benchmark.
Claims (1)
1. the method for quick of a line voltage fundamental positive sequence phase angle; It is characterized in that; Said method is at the line voltage frequency variation, during the asymmetric or distortion of threephase voltage, through the fundamental positive sequence voltage of " frequency locking " and " lock mutually " two links acquisitions electrical network; From this signal, extract the phase angle of fundamental voltage positivesequence component then, concrete steps are following:
aFrequency locking
If the line voltage threephase is asymmetric and when distortion, the electrical network threephase voltage is respectively:
，
In the formula: U is a voltage effective value;
is phase angle; First subscript is represented the preface component: the 1st, and positive sequence; The 2nd, negative phasesequence; The 0th, zero sequence; Second subscript represented overtone order, and
is system's firstharmonic angular frequency
With u
_{a}, u
_{b}, u
_{c}Be converted into the alphabeta coordinate:
，
With u
_{β}Through LPF filtering harmonic component, the signal of acquisition obtains the cosine and sine signal with fundamental positive sequence voltage same frequency by PLL locking phase and frequency:
With
, this has just locked the fundamental frequency of line voltage;
bThe lock phase
With u
_{α}, u
_{β}With the cosine and sine signal matrix
Multiply each other respectively:
?
?，
Utilize the trigonometric function formula, incite somebody to action firstharmonic negative sequence component cancellation wherein through plus and minus calculation:
,
u
_{α s}u
_{β c}With u
_{α c}u
_{β s}Through LPF elimination AC compounent:
，
Utilize the trigonometric function characteristic to obtain the fundamental voltage positivesequence component:
; Produce and the synchronous cosine and sine signal of a phase voltage fundamental positive sequence same frequency through phaselocked loop then, and then obtain line voltage fundamental positive sequence phase angle.
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Cited By (19)
Publication number  Priority date  Publication date  Assignee  Title 

CN102914687A (en) *  20121105  20130206  冶金自动化研究设计院  Method for precisely calculating voltage or current effective value 
CN102916589A (en) *  20121109  20130206  扬州博尔特电气技术有限公司  Voltage stabilization method for tinplated softsmelting highpower mediumfrequency heating power supply 
CN103094924A (en) *  20130104  20130508  广西电网公司电力科学研究院  Method and device for obtaining power grid synchronic benchmark sine based on absence of phase lock loop 
CN103197144A (en) *  20130411  20130710  中国电子科技集团公司第十四研究所  Threephase power phase sequence detection method for invertion device 
CN103197140A (en) *  20130227  20130710  南京南瑞继保电气有限公司  Method for extracting systematic frequency fluctuation signals 
CN103235184A (en) *  20130428  20130807  东方电气集团东方汽轮机有限公司  Grid voltage vector angle detection algorithm of doublefed wind power generation current transformer 
CN103414184A (en) *  20130724  20131127  南京南瑞继保电气有限公司  Method for computing sequence components under frequency changing situation 
CN103593573A (en) *  20131123  20140219  大连尚能科技发展有限公司  Fundamental wave positive sequence voltage extracting and phase locking method 
CN104502674A (en) *  20141231  20150408  漳州科华技术有限责任公司  Threephase voltage effective value detection method and device 
CN104698254A (en) *  20150317  20150610  中国科学院广州能源研究所  Grid fundamental positive sequence voltage extracting method and phaselocking method 
CN104730339A (en) *  20150315  20150624  华南理工大学  Digital phase lock method in condition of unsymmetrical threephase voltage 
CN106374917A (en) *  20160930  20170201  国网江苏省电力公司电力科学研究院  Phaselocked loop implementation method applicable to voltage sag condition 
CN106597217A (en) *  20161128  20170426  华北电力大学  MMCHVDC alternating current side asymmetric fault diagnosis method 
CN107102204A (en) *  20170427  20170829  西安理工大学  Suitable for line voltage distortion and unbalanced voltagephase detection method 
CN107251361A (en) *  20150130  20171013  英捷电力技术有限公司  Synchronization system and correlating method for generator unit 
CN107607784A (en) *  20170728  20180119  中国农业大学  A kind of open loop synchronous method 
CN110146742A (en) *  20190515  20190820  江苏师范大学  A kind of harmonic detecting method based on improvement Virtual shipyard orientation 
CN110702987A (en) *  20191031  20200117  科华恒盛股份有限公司  System for extracting positive and negative sequence fundamental wave components of power grid voltage signal 
CN110927452A (en) *  20191126  20200327  华北水利水电大学  Phase difference measuring method and device based on instantaneous reactive power 
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CN102305886A (en) *  20110531  20120104  浙江大学  Fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage 
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Cited By (29)
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CN102916589A (en) *  20121109  20130206  扬州博尔特电气技术有限公司  Voltage stabilization method for tinplated softsmelting highpower mediumfrequency heating power supply 
CN102916589B (en) *  20121109  20150204  扬州博尔特电气技术有限公司  Voltage stabilization method for tinplated softsmelting highpower mediumfrequency heating power supply 
CN103094924A (en) *  20130104  20130508  广西电网公司电力科学研究院  Method and device for obtaining power grid synchronic benchmark sine based on absence of phase lock loop 
CN103197140A (en) *  20130227  20130710  南京南瑞继保电气有限公司  Method for extracting systematic frequency fluctuation signals 
CN103197144A (en) *  20130411  20130710  中国电子科技集团公司第十四研究所  Threephase power phase sequence detection method for invertion device 
CN103197144B (en) *  20130411  20150902  中国电子科技集团公司第十四研究所  A kind of threephase phase sequence detection method for inverter 
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CN103235184B (en) *  20130428  20150527  东方电气集团东方汽轮机有限公司  Grid voltage vector angle detection algorithm of doublefed wind power generation current transformer 
CN103414184B (en) *  20130724  20150617  南京南瑞继保电气有限公司  Method for computing sequence components under frequency changing situation 
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CN107251361A (en) *  20150130  20171013  英捷电力技术有限公司  Synchronization system and correlating method for generator unit 
CN104730339A (en) *  20150315  20150624  华南理工大学  Digital phase lock method in condition of unsymmetrical threephase voltage 
CN104698254A (en) *  20150317  20150610  中国科学院广州能源研究所  Grid fundamental positive sequence voltage extracting method and phaselocking method 
CN104698254B (en) *  20150317  20170822  中国科学院广州能源研究所  A kind of power network fundamental positive sequence voltage subtraction method and phaselock technique 
CN106374917A (en) *  20160930  20170201  国网江苏省电力公司电力科学研究院  Phaselocked loop implementation method applicable to voltage sag condition 
CN106597217A (en) *  20161128  20170426  华北电力大学  MMCHVDC alternating current side asymmetric fault diagnosis method 
CN106597217B (en) *  20161128  20190517  华北电力大学  A kind of MMCHVDC exchange side unbalanced fault diagnostic method 
CN107102204A (en) *  20170427  20170829  西安理工大学  Suitable for line voltage distortion and unbalanced voltagephase detection method 
CN107607784A (en) *  20170728  20180119  中国农业大学  A kind of open loop synchronous method 
CN110146742A (en) *  20190515  20190820  江苏师范大学  A kind of harmonic detecting method based on improvement Virtual shipyard orientation 
CN110702987A (en) *  20191031  20200117  科华恒盛股份有限公司  System for extracting positive and negative sequence fundamental wave components of power grid voltage signal 
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Application publication date: 20121017 