CN106771507B - Reactive current rapid detection method based on voltage reference split-phase synchronization - Google Patents
Reactive current rapid detection method based on voltage reference split-phase synchronization Download PDFInfo
- Publication number
- CN106771507B CN106771507B CN201710049517.3A CN201710049517A CN106771507B CN 106771507 B CN106771507 B CN 106771507B CN 201710049517 A CN201710049517 A CN 201710049517A CN 106771507 B CN106771507 B CN 106771507B
- Authority
- CN
- China
- Prior art keywords
- phase
- current
- reactive current
- fundamental wave
- lpf
- 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.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 67
- 239000011159 matrix material Substances 0.000 claims description 39
- 230000009466 transformation Effects 0.000 claims description 36
- 238000001914 filtration Methods 0.000 claims description 19
- 230000001360 synchronised effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 25
- 230000007547 defect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 18
- 230000001131 transforming effect Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/06—Measuring real component; Measuring reactive component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a method for quickly detecting reactive current, which belongs to the technical field of electricians, in particular to a method for quickly detecting reactive current based on voltage reference split-phase synchronization, and on one hand, based on an instantaneous reactive power theory, compared with a method for detecting the reactive current in a Fast Fourier Transform (FFT) equal frequency domain, the method for quickly detecting the reactive current based on the voltage reference split-phase synchronization has the advantages of high detection speed and strong real-time property; on the other hand, the method overcomes the defect that the existing reactive current detection method based on the instantaneous reactive power theory cannot realize split-phase reactive current detection, and particularly under the condition of unbalanced load, the method can accurately detect the reactive current of each phase load, while the existing reactive current detection method based on the instantaneous reactive power theory cannot realize the accurate detection of the reactive current of the unbalanced load.
Description
Technical Field
The invention relates to a method for quickly detecting reactive current, belongs to the technical field of electricians, and particularly relates to a method for quickly detecting reactive current based on voltage reference phase splitting synchronization, which can realize phase splitting, real-time and accurate detection of reactive current of any load.
Background
The fast and accurate detection of reactive current is a prerequisite for realizing reactive Power effective compensation of Power quality management devices such as Active Power Filters (APFs) and Static Var Generators (SVGs), and is also one of key technologies for determining device performance. Therefore, the reactive current detection technology is always the key point and the hot point of research in the field of electric energy quality control, and through development of a plurality of years, a plurality of current detection methods are proposed in sequence, wherein the two methods which are more mature and wide in application in engineering are mainly as follows:
first, various frequency domain detection methods based on Fourier series technique are mainly Fast Fourier Transform (FFT) detection methods. The method carries out Fourier analysis according to the collected current value of a power frequency period, and finally obtains the required reactive power and harmonic current. However, the algorithm is complex, has poor timeliness, and is not suitable for being applied to the compensation field with high real-time requirement.
Secondly, various time domain current detection methods based on the three-phase circuit instantaneous reactive power theory have high real-time performance. However, at present, the existing detection method based on the instantaneous reactive power theory cannot realize current split-phase detection, and particularly, when three-phase loads are unbalanced, the reactive current of each phase load cannot be accurately detected. For example, the existing reactive current detection method based on the instantaneous reactive power theory can accurately detect the fundamental wave positive sequence reactive current in the three-phase load current, and when the three-phase load is balanced, the three-phase fundamental wave positive sequence reactive current is the three-phase load fundamental wave reactive current; when the three-phase load is unbalanced, particularly for a three-phase four-wire system, the three-phase fundamental positive-sequence reactive current is not equal to the three-phase load fundamental reactive current due to the presence of the negative-sequence and zero-sequence currents.
Therefore, the invention provides a split-phase rapid detection method of reactive current based on the instantaneous reactive power theory, on one hand, the real-time performance of the instantaneous reactive power theory detection method is fully exerted; on the other hand, the method overcomes the defect that the existing detection method based on the instantaneous reactive power theory can not realize the detection of the split-phase reactive current, and particularly under the condition of unbalanced load, the method can accurately detect the reactive current of each phase load.
Disclosure of Invention
The invention aims to realize phase-splitting, real-time and accurate detection of reactive current of any load.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a reactive current rapid detection method based on voltage reference split-phase synchronization comprises A-phase reactive current detection, B-phase reactive current detection and C-phase reactive current detection,
the A-phase reactive current detection method comprises the following steps:
(1) defining a three-phase arbitrary load current matrix as i:
defining the zero sequence current of any three-phase load as i0:
(2) Defining positive sequence transformation matrix by using A-phase power grid voltage as synchronous reference signalNegative sequence transformation matrixAnd zero sequence transformation matrix C0Comprises the following steps:
(3) application ofConverting three-phase current i in the abc coordinate system into a fundamental wave positive sequence Synchronous Rotating coordinate System (SRF), wherein the current on the converted fundamental wave positive sequence SRF is defined as
Wherein:
(4) Application ofThree-phase current i in the abc coordinate system is converted into a fundamental wave negative sequence SRF, and the three-phase current i is convertedThe current on the fundamental negative sequence SRF is defined as
Wherein:
(5) Application of C0To i0Transforming to obtain:
using LPF to filter i0qIn (b) to obtain i0qThe DC value of (1) is defined as I0q1:
(6) Calculating A-phase reactive current
The B-phase reactive current detection method comprises the following steps:
(1) the three-phase load current i is reordered as:
(2) taking B-phase power grid voltage as a synchronous reference signal, and converting a matrix in positive sequenceNegative sequence transformation matrixAnd zero sequence transformation matrix C0The evolution becomes:
(3) application ofConverting the three-phase current i in the abc coordinate system into a fundamental wave positive sequence SRF to obtain
Wherein:
(4) Application ofConverting three-phase current i in the abc coordinate system into a fundamental wave negative sequence SRF to obtain current
Wherein:
(5) Application of C0To i0Transforming to obtain:
using LPF to filter i0qIn (b) to obtain i0qD.c. value of0q1:
(6) Calculating B-phase reactive current
The C-phase reactive current detection method comprises the following steps:
(1) the three-phase load current i is reordered as:
(2) taking C-phase power grid voltage as synchronous reference signal, positive sequence transformation matrixNegative sequence transformation matrixAnd zero sequence transformation matrix C0The evolution becomes:
(3) application ofConverting the three-phase current i in the abc coordinate system into a fundamental wave positive sequence SRF to obtain
Wherein:
(4) Application ofConverting three-phase current i in the abc coordinate system into a fundamental wave negative sequence SRF to obtain current
Wherein:
(5) Application of C0To i0Transforming to obtain:
using LPF to filter i0qIn (b) to obtain i0qD.c. value of0q1:
(6) Calculating C-phase reactive current
The invention has the beneficial effects that: on one hand, the reactive current fast detection method based on voltage reference split-phase synchronization has fast detection speed and stronger real-time performance compared with a Fast Fourier Transform (FFT) equal frequency domain detection method based on an instantaneous reactive power theory; on the other hand, the method overcomes the defect that the existing reactive current detection method based on the instantaneous reactive power theory cannot realize split-phase reactive current detection, and particularly under the condition of unbalanced load, the method can accurately detect the reactive current of each phase load, while the existing reactive current detection method based on the instantaneous reactive power theory cannot realize the accurate detection of the reactive current of the unbalanced load.
Drawings
Fig. 1 is a schematic diagram of a-phase fundamental wave reactive current detection.
Fig. 2 is a simplified schematic diagram of a-phase fundamental wave reactive current detection.
Fig. 3 is a schematic diagram of B-phase fundamental wave reactive current detection.
Fig. 4 is a simplified schematic diagram of B-phase fundamental wave reactive current detection.
Fig. 5 is a schematic diagram of C-phase fundamental wave reactive current detection.
Fig. 6 is a simplified schematic diagram of C-phase fundamental wave reactive current detection.
FIG. 7 is a typical three-phase unbalanced load wiring diagram for a three-phase four-wire system
Fig. 8 is a three-phase voltage current vector diagram.
Fig. 9 is an a-phase reactive current operation vector diagram.
Fig. 10 is a vector diagram of B-phase and C-phase reactive current operations based on the a-phase voltage.
Fig. 11 is a three-phase voltage-current vector diagram based on the B-phase voltage.
Fig. 12 is a B-phase reactive current operation vector diagram.
Fig. 13 is a three-phase voltage-current vector diagram based on the C-phase voltage.
Fig. 14 is a vector diagram of a C-phase reactive current operation.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the following examples and the accompanying drawings, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
The invention defines the three-phase power grid voltage as:
defining a three-phase arbitrary load current matrix as i:
wherein:
defining the zero sequence current of any three-phase load as i0:
The novel reactive current detection method of the present invention is described in detail below:
detection of A-phase reactive current
The detection principle of A-phase fundamental wave reactive current is as followsShown in FIG. 1, in which θeFor phase signals synchronized with the mains A-phase voltage, i.e. thetae=ωt,Respectively are transformation matrixes from an abc coordinate system to a fundamental wave positive sequence SRF coordinate system and a fundamental wave negative sequence SRF coordinate system;respectively are transformation matrixes from a fundamental positive sequence SRF coordinate system and a fundamental negative sequence SRF coordinate system to an abc coordinate system; c0、Respectively, a zero-sequence current transformation matrix:
step one, detecting positive sequence component
Application ofThe three-phase current positive and negative sequence components expressed by the formulas (3) and (4) are converted into a fundamental wave positive sequence SRF coordinate system, so that the three-phase current SRF coordinate system can be obtained:
and filtering the alternating current component on the dq axis by using an LPF (low pass filter), so that the direct current component on the dq axis can be obtained:
let the d-axis component of equation (14)To zero, applying a transformation matrixThe matrix of the formula (14) is transformed into a three-phase abc coordinate system to obtain three-phase fundamental wave positive sequence reactive current
Step two, detecting the negative sequence component
Application ofConverting the three-phase current positive and negative sequence components expressed by the formulas (3) and (4) into a fundamental negative sequence SRF coordinate system to obtain:
and filtering the alternating current component on the dq axis by using an LPF (low pass filter), so that the direct current component on the dq axis can be obtained:
let the d-axis component of equation (18)To zero, applying a transformation matrixTransformation of equation (18) into the three-phase abc coordinate system yields a three-phase fundamental negative-sequence q-axis current, defined as
Step three, zero sequence component
Using transformation matrices C0To formula (6) i0And (3) carrying out transformation:
filtering an alternating current component on the equivalent dq axis by using an LPF (low pass filter), and obtaining a direct current component on the equivalent dq axis:
let I0d1Is zero, use formula (11)And (3) transforming to solve fundamental wave zero sequence reactive current:
according to equations (15), (19), (22), the fundamental reactive current of the a-phase arbitrary load current is obtained:
it can be seen that the a-phase reactive current detection principle shown in fig. 1 can be further simplified as shown in fig. 2.
Detection of B-phase fundamental wave reactive current
And (3) carrying out a reactive current detection process by taking the phase B as a reference, wherein the specific implementation process is analyzed as follows:
an arbitrary load current i represented by the formula (2)a、ib、icReordering to ib、ic、ia:
Accordingly, the positive and negative sequence currents are:
using B-phase mains voltage as a synchronous reference signal, i.e. thetaeω t-120 °. At this time, the relevant positive and negative sequence and zero sequence current transformation matrix correspondingly evolves as:
step one, detecting positive sequence component
Using matrices of the formula (27)The three-phase current components represented by equations (25) and (26) are transformed into the fundamental positive sequence SRF coordinate system, and it is possible to obtain:
and filtering the alternating current component on the dq axis by using an LPF (low pass filter), so that the direct current component on the dq axis can be obtained:
let the d-axis component of equation (34)To zero, applying the transform matrix of equation (28)The matrix of the formula (34) is transformed into a three-phase abc coordinate system, so that three-phase fundamental wave positive sequence reactive current can be obtained
Step two, detecting the negative sequence component
Using a transformation matrix of the formula (29)The three-phase current components represented by equations (25) and (26) are transformed into the fundamental negative sequence SRF coordinate system, and it is possible to obtain:
and filtering the alternating current component on the dq axis by using an LPF (low pass filter), so that the direct current component on the dq axis can be obtained:
let the d-axis component of equation (38)To zero, applying the transform matrix of equation (30)The three-phase fundamental wave negative sequence q-axis current can be obtained by transforming the matrix of the formula (38) into a three-phase abc coordinate system and is defined as
(3) Zero sequence component detection
Transformation matrix C using equation (31)0To i0And (3) carrying out transformation:
filtering an alternating current component on the equivalent dq axis by using an LPF (low pass filter), and obtaining a direct current component on the equivalent dq axis:
let I0d1Is zero, use formula (31)And (3) transforming to solve fundamental wave zero sequence reactive current:
a fundamental wave reactive current of the B-phase arbitrary load current is obtained from equations (35), (39), and (42):
the above-mentioned B-phase fundamental wave reactive current detection principle and its simplified principle are shown in fig. 3 and 4, respectively.
Detection of C-phase fundamental wave reactive current
Similarly, to correctly detect the C-phase fundamental wave reactive current, the reactive current detection process must be implemented with the C-phase as a reference, and the specific implementation process analysis is as follows:
an arbitrary load current i represented by the formula (2)a、ib、icReordering to ic、ia、ib:
Accordingly, the positive and negative sequence currents are:
using C-phase mains voltage as synchronous reference signal, i.e. thetaeω t +120 °. At this time, the relevant positive and negative sequence and zero sequence current transformation matrix correspondingly evolves as:
step one, detecting positive sequence component
Using a matrix of the formula (47)The three-phase current components represented by equations (45) and (46) are transformed into the fundamental positive sequence SRF coordinate system, which can be obtained:
and filtering the alternating current component on the dq axis by using an LPF (low pass filter), so that the direct current component on the dq axis can be obtained:
let equation (54) d-axis componentTo zero, applying the transform matrix of equation (48)The three-phase fundamental wave positive sequence reactive current can be obtained by transforming the matrix of the formula (54) into a three-phase abc coordinate system
Step two, negative sequence component
Using transformation matrices of the formula (49)The three-phase current components represented by equations (45) and (46) are transformed into the fundamental negative sequence SRF coordinate system, which can be obtained:
and filtering the alternating current component on the dq axis by using an LPF (low pass filter), so that the direct current component on the dq axis can be obtained:
let equation (58) d-axis componentTo zero, applying the transform matrix of formula (3-50)The matrix of the formula (58) is transformed into a three-phase abc coordinate system, and three-phase fundamental wave negative sequence q-axis current can be obtained and fixedIs defined as
Step three, zero sequence component
Using the transformation matrix C of formula (51)0To formula i0And (3) carrying out transformation:
filtering an alternating current component on the equivalent dq axis by using an LPF (low pass filter), and obtaining a direct current component on the equivalent dq axis:
let I0d1Zero, operational type (51)And (3) transforming to solve fundamental wave zero sequence reactive current:
a fundamental reactive current of the C-phase arbitrary load current is obtained from equations (55), (59), and (62):
the above-mentioned principle of detecting the C-phase fundamental wave reactive current and the simplified principle thereof are shown in fig. 5 and 6, respectively.
The three-phase four-wire system unbalanced typical load is used for further verifying the correctness of the method.
Setting three-phase four-wire system unbalanced load: the A phase and the B phase are connected in series with a resistor load, and the C phase is open-circuited, as shown in FIG. 7.
In the figure, R is a resistive load; e.g. of the typea、eb、ecFor the system three-phase voltage, the same formula (1) is defined, expressed in vector form as:
then according to fig. 7, the three-phase load current vector can be represented as:
in the formula, the current vector magnitude I is E/R.
Fig. 8 is a voltage-current vector diagram, and it is apparent that the a-phase reactive current, the B-phase reactive current, and the C-phase reactive current are all zero, and are sequentially set to Iaq、Ibq、Icq。
The correctness of the provided novel fundamental wave reactive current detection method is verified by using a symmetric component method according to the reactive current detection principle of the invention. The symmetric component method is defined as follows:
wherein α is 1 ∠ 120 DEG is complex operator, I+、I-、I0Positive sequence, negative sequence and zero sequence currents, respectively.
The three-phase current vector of the unbalanced load can also be expressed by a symmetrical component method according to the formula (66):
the active and reactive current components of the three-phase load are represented in the form of subscripts p, q, then equation (67) represents the transformation:
(1) a-phase reactive current calculation
With the a-phase voltage as a reference, positive, negative and zero sequence currents are calculated, respectively, according to equation (66):
definition of lead EaThe vector axis of (a) is the q axis, and I is calculated separately+、I-、I0Projection on the q-axis, in turn, is defined asI0qReferring to fig. 9, then:
then, according to equations (68) to (70), the fundamental reactive current a is obtained as:
equation (69) is consistent with the reactive current conclusion of the typical load shown in fig. 8, and the correctness of the detection of the reactive current of the phase a is verified.
For the detection of the B-phase and C-phase reactive currents, it is analyzed below what results would be obtained if the a-phase voltage is still referenced?
The following equations (68) to (70) can be obtained:
obviously, this conclusion does not correspond to the conclusion that the reactive current of the B-phase and C-phase of the typical load shown in fig. 8 is zero, and the corresponding vector diagram is shown in fig. 10.
That is, for the phase a current, the detection of the fundamental reactive current can be obtained by superposing three alternating current components corresponding to q-axis channels of three-phase fundamental positive sequence, negative sequence and zero sequence currents. While for phase B and phase C currents, the reactive current does not have a direct superposition of the three components.
(2) B-phase reactive current calculation
The following analysis detects the B-phase fundamental wave reactive current with the B-phase voltage as a reference.
For the convenience of analysis, the three-phase voltage current vector diagram shown in fig. 8 is rotated counterclockwise by 120 degrees as shown in fig. 11.
Based on fig. 11, the three-phase voltage-current vector after rotation is defined as:
then, the three-phase load current vector can be expressed as:
and, the order component transformation formula evolves to:
the positive, negative and zero sequence currents are calculated respectively according to equation (72):
definition of lead EbThe vector axis of (a) is the q axis, and I is calculated separately+、I-、I0Projection on the q-axis, in turn, is defined asI0qReferring to fig. 12, then:
the unbalanced load three-phase current vector is expressed by a symmetrical component method, wherein only B phase is expressed:
Ib=I++I-+I0(75)
similarly, if the active and reactive current components of the three-phase load are expressed in the form of the symbols p and q, the transformation is expressed by the equation (75):
by combining formulae (74) and (76), the following can be obtained:
equation (77) is consistent with the reactive current conclusion of the typical load shown in fig. 8, and the correctness of the B-phase reactive current detection is verified.
(3) C-phase reactive current calculation
According to the reactive current detection principle of the invention, the C-phase fundamental wave reactive current is detected by analyzing and taking the C-phase voltage as a reference.
The three-phase voltage current vector diagram shown in fig. 8 is rotated 120 degrees clockwise as shown in fig. 13.
Based on fig. 13, the rotated three-phase voltage-current vector phase is converted into:
then, the three-phase load current vector can be expressed as:
and, the order component transformation formula evolves to:
the positive, negative and zero sequence currents are calculated respectively according to equation (80):
definition of lead EcThe vector axis with 90 degrees of phase is the q axis, and I is respectively calculated+、I-、I0Projection on the q-axis, in turn, is defined asI0qReferring to fig. 14, then:
according to the equation (80), the asymmetric system C current vector is expressed by a symmetric component method:
Ic=I++I-+I0(83)
similarly, when the active and reactive current components of the three-phase load are expressed in the form of the following labels p and q, the transformation is expressed by the formula (83):
by combining formulae (81) and (84), the following can be obtained:
equation (85) is consistent with the reactive current conclusion of the typical load shown in fig. 8, and the correctness of the detection of the C-phase reactive current is verified.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A reactive current rapid detection method based on voltage reference split-phase synchronization is characterized by comprising A-phase reactive current detection, B-phase reactive current detection and C-phase reactive current detection,
the A-phase reactive current detection method comprises the following steps of:
(1) defining a three-phase arbitrary load current matrix as i:
wherein:
defining the zero sequence current of any three-phase load as i0:
(2) Defining positive sequence transformation matrix by using A-phase power grid voltage as synchronous reference signalNegative sequence transformation matrixAnd zero sequence transformation matrix C0Comprises the following steps:
(3) application ofConverting three-phase current i in the abc coordinate system into a fundamental wave positive sequence Synchronous Rotating coordinate System (SRF), wherein the current on the converted fundamental wave positive sequence SRF is defined as
Wherein:
(4) Application ofThree-phase current i in the abc coordinate system is converted into a fundamental wave negative sequence SRF, and the current on the converted fundamental wave negative sequence SRF is defined as
Wherein:
(5) Application of C0To i0Transforming to obtain:
using LPF to filter i0qIn (b) to obtain i0qThe DC value of (1) is defined as I0q1:
(6) Calculating A-phase reactive current
The B-phase reactive current detection method comprises the following steps:
(1) the three-phase load current i is reordered as:
(2) taking B-phase power grid voltage as a synchronous reference signal, and converting a matrix in positive sequenceNegative sequence transformation matrixAnd zero sequence transformation matrix C0The evolution becomes:
(3) application ofConverting the three-phase current i in the abc coordinate system into a fundamental wave positive sequence SRF to obtain
Wherein:
(4) Application ofConverting three-phase current i in the abc coordinate system into a fundamental wave negative sequence SRF to obtain current
Wherein:
(5) Application of C0To i0Transforming to obtain:
using LPF to filter i0qIn (b) to obtain i0qD.c. value of0q1:
(6) Calculating B-phase reactive current
The C-phase reactive current detection method comprises the following steps:
(1) the three-phase load current i is reordered as:
(2) taking C-phase power grid voltage as synchronous reference signal, positive sequence transformation matrixNegative sequence transformation matrixAnd zero sequence transformation matrix C0The evolution becomes:
(3) application ofConverting the three-phase current i in the abc coordinate system into a fundamental wave positive sequence SRF to obtain
Wherein:
(4) Application ofConverting three-phase current i in the abc coordinate system into a fundamental wave negative sequence SRF to obtain current
Wherein:
(5) Application of C0To i0Transforming to obtain:
using LPF to filter i0qIn (b) to obtain i0qD.c. value of0q1:
(6) Calculating C-phase reactive current
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710049517.3A CN106771507B (en) | 2017-01-20 | 2017-01-20 | Reactive current rapid detection method based on voltage reference split-phase synchronization |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710049517.3A CN106771507B (en) | 2017-01-20 | 2017-01-20 | Reactive current rapid detection method based on voltage reference split-phase synchronization |
Publications (2)
Publication Number | Publication Date |
---|---|
CN106771507A CN106771507A (en) | 2017-05-31 |
CN106771507B true CN106771507B (en) | 2020-02-14 |
Family
ID=58941608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201710049517.3A Active CN106771507B (en) | 2017-01-20 | 2017-01-20 | Reactive current rapid detection method based on voltage reference split-phase synchronization |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN106771507B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111208340A (en) * | 2020-02-26 | 2020-05-29 | 泰州学院 | Single-phase fundamental wave reactive current accurate detection method based on Fourier transform |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5751138A (en) * | 1995-06-22 | 1998-05-12 | University Of Washington | Active power conditioner for reactive and harmonic compensation having PWM and stepped-wave inverters |
CN201556947U (en) * | 2009-10-29 | 2010-08-18 | 山东山大华天科技股份有限公司 | Three-phase three-wire dynamic split-phase reactive power compensation device |
CN101893651A (en) * | 2010-06-18 | 2010-11-24 | 上海理工大学 | Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system |
CN101950972A (en) * | 2010-10-22 | 2011-01-19 | 湖南大学 | SVC composite control method based on rapid equivalent susceptance calculation |
CN202474878U (en) * | 2012-03-19 | 2012-10-03 | 刘松荣 | Low-voltage asymmetric reactive compensation device |
CN103399200A (en) * | 2013-08-12 | 2013-11-20 | 国家电网公司 | Idle current detection and calculation method for power network current |
CN104300541A (en) * | 2014-09-15 | 2015-01-21 | 泰州学院 | Dynamic prediction compensation method for controlling time delay through active power filter |
CN104391170A (en) * | 2014-12-19 | 2015-03-04 | 国家电网公司 | Detection and calculation method for zero-sequence current |
-
2017
- 2017-01-20 CN CN201710049517.3A patent/CN106771507B/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5751138A (en) * | 1995-06-22 | 1998-05-12 | University Of Washington | Active power conditioner for reactive and harmonic compensation having PWM and stepped-wave inverters |
CN201556947U (en) * | 2009-10-29 | 2010-08-18 | 山东山大华天科技股份有限公司 | Three-phase three-wire dynamic split-phase reactive power compensation device |
CN101893651A (en) * | 2010-06-18 | 2010-11-24 | 上海理工大学 | Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system |
CN101950972A (en) * | 2010-10-22 | 2011-01-19 | 湖南大学 | SVC composite control method based on rapid equivalent susceptance calculation |
CN202474878U (en) * | 2012-03-19 | 2012-10-03 | 刘松荣 | Low-voltage asymmetric reactive compensation device |
CN103399200A (en) * | 2013-08-12 | 2013-11-20 | 国家电网公司 | Idle current detection and calculation method for power network current |
CN104300541A (en) * | 2014-09-15 | 2015-01-21 | 泰州学院 | Dynamic prediction compensation method for controlling time delay through active power filter |
CN104300541B (en) * | 2014-09-15 | 2017-04-26 | 泰州学院 | Dynamic prediction compensation method for controlling time delay through active power filter |
CN104391170A (en) * | 2014-12-19 | 2015-03-04 | 国家电网公司 | Detection and calculation method for zero-sequence current |
Non-Patent Citations (1)
Title |
---|
基于瞬时无功理论的无功电流检测方法研究;曾光等;《电力电子技术》;20090630;第43卷(第6期);第9-11页 * |
Also Published As
Publication number | Publication date |
---|---|
CN106771507A (en) | 2017-05-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101893652B (en) | Method for detecting harmonic wave and reactive current based on spatial transformation of voltage vectors | |
CN108155643B (en) | A kind of robust estimation method of the single-phase mains voltage parameter based on sliding mode observer | |
CN101493482B (en) | Single-phase harmonic current detecting method | |
CN104502705B (en) | Suitable for line voltage distortion and unbalanced no phase-locked loop rotating vector detection method | |
CN102735938A (en) | Quick detection method of grid voltage fundamental wave positive sequence phase angle | |
CN111122952B (en) | Method for rapidly detecting three-phase voltage sag | |
CN106602895B (en) | Method and system for detecting commutation parameters of high-voltage direct-current transmission converter | |
CN102590618B (en) | Detection method of positive sequence voltage phase of fundamental wave for power grid | |
CN105823921A (en) | Compensating current detection method based on instant space voltage vector orientation | |
CN106410858A (en) | Software digital phase-locking method based on dual dq coordination conversion | |
CN108627731A (en) | A kind of rapid detection method of single-phase power-off | |
Wen et al. | Approximate algorithm for fast calculating voltage unbalance factor of three-phase power system | |
CN105978377A (en) | Converter neutral-point voltage balance control method based on SHEPWM | |
CN111208340A (en) | Single-phase fundamental wave reactive current accurate detection method based on Fourier transform | |
CN103546149A (en) | Phase locking method for three-phase power system | |
CN106771507B (en) | Reactive current rapid detection method based on voltage reference split-phase synchronization | |
CN110596455B (en) | Power frequency electrical parameter extraction method, system and computer readable storage medium | |
CN106483375B (en) | A kind of multi-frequency fractional harmonic wave detection method | |
CN104820129A (en) | Fundamental wave positive sequence active current detection method | |
CN108667043A (en) | A kind of three-phase four-wire system APF modifieds vector resonance control method | |
JP2013108846A (en) | Power measuring device, control circuit, interconnection inverter system, and power measuring method | |
Yuan et al. | Improved fbd reactive power and harmonic current detecting method based on voltage sequence decomposition | |
Valtierra-Rodriguez et al. | FPGA-based instantaneous estimation of unbalance/symmetrical components through the Hilbert transform | |
Mourad et al. | Modelling and Parameter identification of synchronous machine by PWM excitation signals | |
Guo et al. | A new method of double fundamental frequency phase-locked loop based on two integrators |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant | ||
TR01 | Transfer of patent right |
Effective date of registration: 20231108 Address after: Building A, Phase II, Standard Factory Building, Runzhou Road, Huishan Industrial Transformation Cluster Zone, Wuxi City, Jiangsu Province, 214100 Patentee after: Jiangsu Naquan Hongyuan New Energy Technology Co.,Ltd. Address before: No. 93, Taizhou City, Jiangsu Province, Ying Chun East Road, Jiangsu Patentee before: TAIZHOU University |
|
TR01 | Transfer of patent right |