[go: up one dir, main page]

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
fundamental
sequence
frequency
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

Images

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)

Abstract

一种电网电压基波正序相角的快速检测方法，所述方法在电网电压频率变动，三相电压不对称或畸变时，通过“锁频”和“锁相”两个环节获得电网的基波正序电压，然后从该信号中提取出基波电压正序分量的相角。本发明可在电网电压频率不稳定，波形畸变时，通过“锁频”和“锁相”两个环节除去谐波分量和基波负序分量的干扰，准确检测电网电压基波正序分量的相角，所述方法不仅检测精度高，而且动态响应速度较快，可保证各类电力电子设备的正常运行。

Figure 201210235448

A method for quickly detecting the positive-sequence phase angle of the fundamental wave of the power grid voltage. The method obtains the fundamental value of the power grid through two links of "frequency locking" and "phase locking" when the frequency of the grid voltage changes, and the three-phase voltage is asymmetrical or distorted. wave positive sequence voltage, and then extract the phase angle of the positive sequence component of the fundamental voltage from this signal. The invention can remove the interference of the harmonic component and the negative sequence component of the fundamental wave through two links of "frequency locking" and "phase locking" when the voltage frequency of the grid is unstable and the waveform is distorted, and can accurately detect the positive sequence component of the fundamental wave of the grid voltage Phase angle, the method not only has high detection accuracy, but also has a fast dynamic response speed, which can ensure the normal operation of various power electronic equipment.

Figure 201210235448

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:
Figure 219377DEST_PATH_IMAGE001
，
In the formula: U is a voltage effective value;
Figure 62568DEST_PATH_IMAGE002
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
Figure 47842DEST_PATH_IMAGE003
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:
Figure 897166DEST_PATH_IMAGE005
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
Figure 383828DEST_PATH_IMAGE007
Multiply each other respectively:
Figure 333330DEST_PATH_IMAGE008
? ?，
Utilize the trigonometric function formula, incite somebody to action first-harmonic negative sequence component cancellation wherein through plus and minus calculation:
Figure 76344DEST_PATH_IMAGE010
，
u α s-u β cWith u α c-u β sThrough LPF elimination AC compounent:
Figure 239472DEST_PATH_IMAGE011
，
Utilize the trigonometric function characteristic to obtain the fundamental voltage positive-sequence component:
Figure 891033DEST_PATH_IMAGE012
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:
Figure 529825DEST_PATH_IMAGE013
, nth harmonic voltage positive-sequence component effective value;
Figure 925034DEST_PATH_IMAGE014
, nth harmonic voltage negative sequence component effective value;
Figure 942668DEST_PATH_IMAGE015
, nth harmonic voltage zero-sequence component effective value;
Figure 30710DEST_PATH_IMAGE016
, 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;
Figure 962260DEST_PATH_IMAGE019
, the initial phase angle of nth harmonic voltage zero-sequence component; N, overtone order;
Figure 814678DEST_PATH_IMAGE003
, angular frequency; t, the time; u a, u b, u cBe three-phase voltage; u α, u βBe process
Figure 569008DEST_PATH_IMAGE020
Be converted into the voltage of alpha-beta axle; α β-dq transformation matrix of coordinates C does
Figure 774861DEST_PATH_IMAGE021
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:
Figure 298246DEST_PATH_IMAGE022
，
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
Figure 333285DEST_PATH_IMAGE023
，
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
Figure 962346DEST_PATH_IMAGE025
, 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:
Figure 890988DEST_PATH_IMAGE026
?
Figure 619910DEST_PATH_IMAGE027
?，
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:
Figure 167566DEST_PATH_IMAGE028
，
u α s-u β cWith u α c-u β sProcess LPF elimination AC compounent:
Figure 665543DEST_PATH_IMAGE029
,
Related characteristics through trigonometric function obtains the fundamental voltage positive-sequence component:
Figure 765086DEST_PATH_IMAGE030
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)

1.一种电网电压基波正序相角的快速检测方法，其特征是，所述方法在电网电压频率变动，三相电压不对称或畸变时，通过“锁频”和“锁相”两个环节获得电网的基波正序电压，然后从该信号中提取出基波电压正序分量的相角，具体步骤如下： 1. A fast detection method of grid voltage fundamental wave positive sequence phase angle, it is characterized in that, described method is when grid voltage frequency changes, three-phase voltage asymmetry or distortion, through " frequency lock " and " phase lock " two The first step is to obtain the fundamental positive sequence voltage of the power grid, and then extract the phase angle of the positive sequence component of the fundamental voltage from the signal. The specific steps are as follows: a锁频 a frequency lock 设电网电压三相不对称且畸变时，电网三相电压分别为： Assuming that the three-phase grid voltage is asymmetrical and distorted, the three-phase grid voltages are:
Figure 424391DEST_PATH_IMAGE001
，
Figure 424391DEST_PATH_IMAGE001
, 式中：U为电压有效值，
Figure 387667DEST_PATH_IMAGE002
为相角，第一个下标表示序分量：1是正序，2是负序，0是零序，第二个下标表示谐波次数，
Figure 747105DEST_PATH_IMAGE003
为系统基波角频率， In the formula: U is the effective value of the voltage,
Figure 387667DEST_PATH_IMAGE002
is the phase angle, the first subscript indicates the sequence component: 1 is the positive sequence, 2 is the negative sequence, 0 is the zero sequence, the second subscript indicates the harmonic order,
Figure 747105DEST_PATH_IMAGE003
is the fundamental angular frequency of the system, 将ua, ub, uc变换至α-β坐标，得： Transform u a , u b , u c to α-β coordinates, get:
Figure 544159DEST_PATH_IMAGE004
，
Figure 544159DEST_PATH_IMAGE004
, 将uβ通过LPF滤除谐波分量，获得的信号由PLL锁定相位和频率，得到与基波正序电压同频率的正余弦信号：
Figure 746471DEST_PATH_IMAGE005
和
Figure 919963DEST_PATH_IMAGE006
，这就锁定了电网电压的基波频率； Filter u β through LPF to filter out harmonic components, and the obtained signal is locked in phase and frequency by PLL to obtain a sine and cosine signal with the same frequency as the fundamental positive sequence voltage:
Figure 746471DEST_PATH_IMAGE005
and
Figure 919963DEST_PATH_IMAGE006
, which locks the fundamental frequency of the grid voltage; b锁相 b phase lock 将uα，uβ与正余弦信号矩阵
Figure 399486DEST_PATH_IMAGE007
分别相乘： Combine u α , u β with the sine-cosine signal matrix
Figure 399486DEST_PATH_IMAGE007
Multiplied separately:
Figure 367442DEST_PATH_IMAGE008
 
Figure 57049DEST_PATH_IMAGE009
 ，
Figure 367442DEST_PATH_IMAGE008
Figure 57049DEST_PATH_IMAGE009
, 利用三角函数公式，通过加减运算将其中的基波负序分量消去： Use the trigonometric formula to eliminate the negative sequence component of the fundamental wave through addition and subtraction: , , uαs-uβc与uαc-uβs经过LPF滤去交流分量，得: u αs -u βc and u αc -u βs filter out the AC component through LPF, and get:
Figure 102683DEST_PATH_IMAGE011
，
Figure 102683DEST_PATH_IMAGE011
, 利用三角函数特性得到基波电压正序分量： The positive sequence component of the fundamental voltage is obtained by using the characteristics of trigonometric functions:
Figure 241540DEST_PATH_IMAGE012
，然后通过锁相环产生与a相电压基波正序分量同频率同相位的正余弦信号，进而得到电网电压基波正序相角。
Figure 241540DEST_PATH_IMAGE012
, and then generate a sine-cosine signal with the same frequency and phase as the positive-sequence component of the fundamental wave of the phase a voltage through the phase-locked loop, and then obtain the positive-sequence phase angle of the fundamental wave of the grid voltage.
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 (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102916589A (en) * 2012-11-09 2013-02-06 扬州博尔特电气技术有限公司 Voltage stabilizing method for tinning reflow high-power medium-frequency heating power supply
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
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
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 A Phase-Locked Loop Realization Applicable to Voltage Sag
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 Harmonic Detection Method Based on Improved Virtual Flux Linkage 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 A method and device for measuring phase difference based on instantaneous reactive power
CN115825531A (en) * 2022-12-28 2023-03-21 卧龙电气集团辽宁荣信电气传动有限公司 A method and device for detecting negative-sequence voltage components adapted to wide-frequency changes in power grids
WO2023045469A1 (en) * 2021-09-27 2023-03-30 新疆金风科技股份有限公司 Power grid frequency detection method, apparatus, power grid frequency adjustment method, and apparatus

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 (31)

* 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 stabilizing method for tinning reflow 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 stabilizing method for tinning reflow 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 A Phase-Locked Loop Realization Applicable to Voltage Sag
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 Harmonic Detection Method Based on Improved Virtual Flux Linkage 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 A method and device for measuring phase difference 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
WO2023045469A1 (en) * 2021-09-27 2023-03-30 新疆金风科技股份有限公司 Power grid frequency detection method, apparatus, power grid frequency adjustment method, and apparatus
CN115825531A (en) * 2022-12-28 2023-03-21 卧龙电气集团辽宁荣信电气传动有限公司 A method and device for detecting negative-sequence voltage components adapted to wide-frequency changes in power grids

Similar Documents

Publication Publication Date Title
CN102735938A (en) Quick detection method of grid voltage fundamental wave positive sequence phase angle
CN101893652B (en) Method for detecting harmonic wave and reactive current based on spatial transformation of voltage vectors
CN103777076B (en) Detection method of arbitrary order harmonic component and reactive current in three-phase four-wire system
CN105162137B (en) Idle and harmonic current detection under complex electric network
CN106501574A (en) A kind of novel active power filter harmonic current detecting method
CN102621382B (en) Method for detecting frequency, phase and amplitude of electric signal in electric power system
CN102385003B (en) Method for detecting frequency and phase of voltage signals or current signals in electric power system
CN105823921A (en) Compensating current detection method based on instant space voltage vector orientation
CN106936125B (en) A Generalized Second-Order Integral Phase Locked Loop Small Signal Impedance Modeling Method
CN102565523B (en) Current harmonic detection system and working method
CN104659813B (en) A kind of multi-inverter parallel control method of quick harmonic circulating current suppression
CN102590618B (en) Detection method of positive sequence voltage phase of fundamental wave for power grid
CN104698254B (en) A kind of power network fundamental positive sequence voltage subtraction method and phase-lock technique
CN102253266A (en) Three-phase four-wire system harmonic current detection method based on linear filter
CN104953801A (en) Harmonic current suppression device and method for voltage source grid-connected inverter
CN103267897A (en) A Three-Phase Phase-Locked Loop Based on Inverse Park Transformation
CN106602895A (en) Method and system for detecting commutation parameters of high-voltage direct-current transmission converter
CN104535820A (en) Three-phase active power filter harmonic current detection method based on FBD method
CN108414838B (en) Method for measuring line impedance of inverter parallel system
CN106532749A (en) Unbalanced power and harmonic voltage compensation system for micro-grid and application of system
CN105738699A (en) Fundamental wave positive order voltage extraction and phase locking method in power grid
CN110146742A (en) A Harmonic Detection Method Based on Improved Virtual Flux Linkage Orientation
CN112698095A (en) High-precision detection method for fundamental wave and arbitrary subharmonic
KR102200554B1 (en) Phase detecting device of system voltage
Mindykowski et al. A new concept of harmonic current detection for shunt active power filters control

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