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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
voltage
phase
frequency
sequence
positive sequence
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012102354482A
Other languages
Chinese (zh)
Inventor
常鲜戎
戴毅
郑焕坤
董正华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North China Electric Power University
Original Assignee
North China Electric Power University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North China Electric Power University filed Critical North China Electric Power University
Priority to CN2012102354482A priority Critical patent/CN102735938A/en
Publication of CN102735938A publication Critical patent/CN102735938A/en
Pending legal-status Critical Current

Links

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 three-phase 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

A kind of method for quick of line voltage fundamental positive sequence phase angle
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 positive-sequence 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, three-phase asymmetry problem are serious day by day.In engineering; The fundamental frequency disturbance of line voltage; Harmonic wave and three-phase 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 (D-STATCOM), the DC transmission system etc.) can't operate as normal.This is because when the three-phase 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 phase-sequence, 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 three-phase voltage wave form distortion, to the voltage fundamental positive-sequence 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 phase-angle 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; Three-phase 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 positive-sequence component then, its concrete steps are following:
A. frequency locking
If the line voltage three-phase is asymmetric and when distortion, the electrical network three-phase 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 phase-sequence; The 0th, zero sequence); Second subscript represented overtone order, and is system's first-harmonic angular frequency
With u a, u b, u cBe converted into the alpha-beta coordinate:
With u βThrough LPF (low-pass 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 βWith the cosine and sine signal matrix Multiply each other respectively:
? ?,
Utilize the trigonometric function formula, incite somebody to action first-harmonic negative sequence component cancellation wherein through plus and minus calculation:
u α s-u β cWith u α c-u β sThrough LPF elimination AC compounent:
Utilize the trigonometric function characteristic to obtain the fundamental voltage positive-sequence 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 first-harmonic negative sequence component, the phase angle of accurate detection of grid voltage fundamental positive-sequence 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 positive-sequence component effective value; , nth harmonic voltage negative sequence component effective value; , nth harmonic voltage zero-sequence component effective value; , a phase fundamental voltage positive-sequence component effective value; , the initial phase angle of nth harmonic voltage positive-sequence component; , the initial phase angle of nth harmonic voltage negative sequence component; , the initial phase angle of nth harmonic voltage zero-sequence component; N, overtone order; , angular frequency; t, the time; u a, u b, u cBe three-phase voltage; u α, u βBe process Be converted into the voltage of alpha-beta axle; α β-dq 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 positive-sequence component phase angle, establish three-phase voltage u a, u b, u cBe respectively:
In the formula: U is a voltage effective value, and first subscript is represented preface component (the 1st, positive sequence, the 2nd, negative phase-sequence, 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 alpha-beta coordinate:
With u αThrough 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 βMultiply each other respectively with the cosine and sine signal matrix:
? ?,
Utilize the correlation formula of trigonometric function, will wherein comprise the component cancellation of first-harmonic negative phase-sequence information through plus and minus calculation:
u α s-u β cWith u α c-u β sProcess LPF elimination AC compounent: ,
Related characteristics through trigonometric function obtains the fundamental voltage positive-sequence 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 three-phase four-wire 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); Non-linear out-of-balance load by the non-linear partial (R1+jX1=18+ j0.03 Ω) that inserts electrical network through three-phase commutation bridge with insert through single-phase rectification bridge that B out-of-balance 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 phase-sequence, 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 three-phase 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 positive-sequence component then, concrete steps are following:
aFrequency locking
If the line voltage three-phase is asymmetric and when distortion, the electrical network three-phase 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 phase-sequence; The 0th, zero sequence; Second subscript represented overtone order, and is system's first-harmonic angular frequency
With u a, u b, u cBe converted into the alpha-beta coordinate:
With u βThrough 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 βWith the cosine and sine signal matrix Multiply each other respectively:
? ?,
Utilize the trigonometric function formula, incite somebody to action first-harmonic negative sequence component cancellation wherein through plus and minus calculation:
,
u α s-u β cWith u α c-u β sThrough LPF elimination AC compounent:
Utilize the trigonometric function characteristic to obtain the fundamental voltage positive-sequence 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.
CN2012102354482A 2012-07-09 2012-07-09 Quick detection method of grid voltage fundamental wave positive sequence phase angle Pending CN102735938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012102354482A CN102735938A (en) 2012-07-09 2012-07-09 Quick detection method of grid voltage fundamental wave positive sequence phase angle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012102354482A CN102735938A (en) 2012-07-09 2012-07-09 Quick detection method of grid voltage fundamental wave positive sequence phase angle

Publications (1)

Publication Number Publication Date
CN102735938A true CN102735938A (en) 2012-10-17

Family

ID=46991790

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012102354482A Pending CN102735938A (en) 2012-07-09 2012-07-09 Quick detection method of grid voltage fundamental wave positive sequence phase angle

Country Status (1)

Country Link
CN (1) CN102735938A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102914687A (en) * 2012-11-05 2013-02-06 冶金自动化研究设计院 Method for precisely calculating voltage or current effective value
CN102916589A (en) * 2012-11-09 2013-02-06 扬州博尔特电气技术有限公司 Voltage stabilization method for tin-plated soft-smelting high-power medium-frequency heating power supply
CN103094924A (en) * 2013-01-04 2013-05-08 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) * 2013-04-11 2013-07-10 中国电子科技集团公司第十四研究所 Three-phase power phase sequence detection method for invertion device
CN103197140A (en) * 2013-02-27 2013-07-10 南京南瑞继保电气有限公司 Method for extracting systematic frequency fluctuation signals
CN103235184A (en) * 2013-04-28 2013-08-07 东方电气集团东方汽轮机有限公司 Grid voltage vector angle detection algorithm of double-fed wind power generation current transformer
CN103414184A (en) * 2013-07-24 2013-11-27 南京南瑞继保电气有限公司 Method for computing sequence components under frequency changing situation
CN103593573A (en) * 2013-11-23 2014-02-19 大连尚能科技发展有限公司 Fundamental wave positive sequence voltage extracting and phase locking method
CN104502674A (en) * 2014-12-31 2015-04-08 漳州科华技术有限责任公司 Three-phase voltage effective value detection method and device
CN104698254A (en) * 2015-03-17 2015-06-10 中国科学院广州能源研究所 Grid fundamental positive sequence voltage extracting method and phase-locking method
CN104730339A (en) * 2015-03-15 2015-06-24 华南理工大学 Digital phase lock method in condition of unsymmetrical three-phase voltage
CN106374917A (en) * 2016-09-30 2017-02-01 国网江苏省电力公司电力科学研究院 Phase-locked loop implementation method applicable to voltage sag condition
CN106597217A (en) * 2016-11-28 2017-04-26 华北电力大学 MMC-HVDC alternating current side asymmetric fault diagnosis method
CN107102204A (en) * 2017-04-27 2017-08-29 西安理工大学 Suitable for line voltage distortion and unbalanced voltage-phase detection method
CN107251361A (en) * 2015-01-30 2017-10-13 英捷电力技术有限公司 Synchronization system and correlating method for generator unit
CN107607784A (en) * 2017-07-28 2018-01-19 中国农业大学 A kind of open loop synchronous method
CN110146742A (en) * 2019-05-15 2019-08-20 江苏师范大学 A kind of harmonic detecting method based on improvement Virtual shipyard orientation
CN110702987A (en) * 2019-10-31 2020-01-17 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) * 2019-11-26 2020-03-27 华北水利水电大学 Phase difference measuring method and device based on instantaneous reactive power

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090105979A1 (en) * 2007-10-23 2009-04-23 Gerardo Escobar Valderrama Fixed reference frame phase-locked loop (FRF-PLL) for unbalanced line voltage conditions
CN102305886A (en) * 2011-05-31 2012-01-04 浙江大学 Fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090105979A1 (en) * 2007-10-23 2009-04-23 Gerardo Escobar Valderrama Fixed reference frame phase-locked loop (FRF-PLL) for unbalanced line voltage conditions
CN102305886A (en) * 2011-05-31 2012-01-04 浙江大学 Fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
吕云干等: "电能质量干扰环境下的电力系统基本频率估计", 《电工技术学报》, vol. 22, no. 1, 31 January 2007 (2007-01-31) *
谢运祥等: "改进型谐波与基波有功和无功电流检测法", 《华南理工大学学报( 自然科学版)》, vol. 33, no. 4, 30 April 2005 (2005-04-30) *

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102914687A (en) * 2012-11-05 2013-02-06 冶金自动化研究设计院 Method for precisely calculating voltage or current effective value
CN102916589A (en) * 2012-11-09 2013-02-06 扬州博尔特电气技术有限公司 Voltage stabilization method for tin-plated soft-smelting high-power medium-frequency heating power supply
CN102916589B (en) * 2012-11-09 2015-02-04 扬州博尔特电气技术有限公司 Voltage stabilization method for tin-plated soft-smelting high-power medium-frequency heating power supply
CN103094924A (en) * 2013-01-04 2013-05-08 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) * 2013-02-27 2013-07-10 南京南瑞继保电气有限公司 Method for extracting systematic frequency fluctuation signals
CN103197144A (en) * 2013-04-11 2013-07-10 中国电子科技集团公司第十四研究所 Three-phase power phase sequence detection method for invertion device
CN103197144B (en) * 2013-04-11 2015-09-02 中国电子科技集团公司第十四研究所 A kind of three-phase phase sequence detection method for inverter
CN103235184A (en) * 2013-04-28 2013-08-07 东方电气集团东方汽轮机有限公司 Grid voltage vector angle detection algorithm of double-fed wind power generation current transformer
CN103235184B (en) * 2013-04-28 2015-05-27 东方电气集团东方汽轮机有限公司 Grid voltage vector angle detection algorithm of double-fed wind power generation current transformer
CN103414184B (en) * 2013-07-24 2015-06-17 南京南瑞继保电气有限公司 Method for computing sequence components under frequency changing situation
CN103414184A (en) * 2013-07-24 2013-11-27 南京南瑞继保电气有限公司 Method for computing sequence components under frequency changing situation
CN103593573A (en) * 2013-11-23 2014-02-19 大连尚能科技发展有限公司 Fundamental wave positive sequence voltage extracting and phase locking method
CN103593573B (en) * 2013-11-23 2017-05-03 大连尚能科技发展有限公司 Fundamental wave positive sequence voltage extracting and phase locking method
CN104502674B (en) * 2014-12-31 2017-12-19 漳州科华技术有限责任公司 A kind of three-phase voltage RMS to DC method and detection means
CN104502674A (en) * 2014-12-31 2015-04-08 漳州科华技术有限责任公司 Three-phase voltage effective value detection method and device
CN107251361B (en) * 2015-01-30 2020-05-19 英捷电力技术有限公司 Synchronization system and synchronization method for power generation units
CN107251361A (en) * 2015-01-30 2017-10-13 英捷电力技术有限公司 Synchronization system and correlating method for generator unit
CN104730339A (en) * 2015-03-15 2015-06-24 华南理工大学 Digital phase lock method in condition of unsymmetrical three-phase voltage
CN104698254A (en) * 2015-03-17 2015-06-10 中国科学院广州能源研究所 Grid fundamental positive sequence voltage extracting method and phase-locking method
CN104698254B (en) * 2015-03-17 2017-08-22 中国科学院广州能源研究所 A kind of power network fundamental positive sequence voltage subtraction method and phase-lock technique
CN106374917A (en) * 2016-09-30 2017-02-01 国网江苏省电力公司电力科学研究院 Phase-locked loop implementation method applicable to voltage sag condition
CN106597217A (en) * 2016-11-28 2017-04-26 华北电力大学 MMC-HVDC alternating current side asymmetric fault diagnosis method
CN106597217B (en) * 2016-11-28 2019-05-17 华北电力大学 A kind of MMC-HVDC exchange side unbalanced fault diagnostic method
CN107102204A (en) * 2017-04-27 2017-08-29 西安理工大学 Suitable for line voltage distortion and unbalanced voltage-phase detection method
CN107607784A (en) * 2017-07-28 2018-01-19 中国农业大学 A kind of open loop synchronous method
CN110146742A (en) * 2019-05-15 2019-08-20 江苏师范大学 A kind of harmonic detecting method based on improvement Virtual shipyard orientation
CN110702987A (en) * 2019-10-31 2020-01-17 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) * 2019-11-26 2020-03-27 华北水利水电大学 Phase difference measuring method and device based on instantaneous reactive power
CN110927452B (en) * 2019-11-26 2021-11-09 华北水利水电大学 Phase difference measuring method and device based on instantaneous reactive power

Similar Documents

Publication Publication Date Title
CN102735938A (en) Quick detection method of grid voltage fundamental wave positive sequence phase angle
CN106501574B (en) A kind of Active Power Filter Harmonic Currents detection method
CN103199539B (en) Voltage dip compensation method of unified power quality conditioner with zero input active power
CN101893652A (en) Method for detecting harmonic wave and reactive current based on spatial transformation of voltage vectors
CN103777076A (en) Method for detecting any-th harmonic component and reactive current of three-phase four-wire system
CN102621382A (en) Method for detecting frequency, phase and amplitude of electric signal in electric power system
CN102508098B (en) Quick distinguishing method for zero-sequence directional elements of alternating-current and direct-current serial-parallel power grid
CN102590618A (en) Detection method of positive sequence voltage phase of fundamental wave for power grid
CN103105535B (en) Three-phase phase-locked loop method suitable for photovoltaic connected grid low voltage ride-through
CN105425171A (en) Method for detecting voltage drop of low voltage ride-through power source of frequency converter
CN105823921A (en) Compensating current detection method based on instant space voltage vector orientation
CN104502705A (en) Non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance
CN103472301A (en) Method and system for extracting positive sequence component and negative sequence component of network voltage
CN103296700A (en) Interconnection-line-less compensation control method of microgrid harmonic waves and idle currents
CN103219731A (en) Three-phase phase-locked loop method appropriate for photovoltaic grid connected low voltage ride through
Mindykowski et al. A new concept of harmonic current detection for shunt active power filters control
CN105140927B (en) The computational methods of distribution network var compensation condenser capacity containing harmonic wave
CN108141038A (en) Distribution network harmonic pollution determines
Jarzyna et al. An evaluation of the accuracy of inverter sync angle during the grid's disturbances
CN105021872A (en) Active and passive component detection method for different current components in distorted and asymmetric voltage state of electrical network
CN106026094A (en) Imbalance control algorithm applied to active filter
CN104820129B (en) A kind of detection method of fundamental positive sequence active current
CN103094916A (en) Three-phase three-wire system interphase balance method based on electric power active power filter
CN108155643A (en) A kind of robust estimation method of the single-phase mains voltage parameter based on sliding mode observer
CN109001589B (en) Line parameter time domain calculation method based on non-full-phase operation fault recording data

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C12 Rejection of a patent application after its publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20121017