CN102385003B - Method for detecting frequency and phase of voltage signals or current signals in electric power system - Google Patents
Method for detecting frequency and phase of voltage signals or current signals in electric power system Download PDFInfo
- Publication number
- CN102385003B CN102385003B CN 201110347668 CN201110347668A CN102385003B CN 102385003 B CN102385003 B CN 102385003B CN 201110347668 CN201110347668 CN 201110347668 CN 201110347668 A CN201110347668 A CN 201110347668A CN 102385003 B CN102385003 B CN 102385003B
- Authority
- CN
- China
- Prior art keywords
- signal
- value
- frequency
- phase
- power system
- 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
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The invention relates to a method for detecting frequency and phase of voltage signals or current signals in an electric power system, and belongs to the technical filed of electric power signal detection. Firstly, voltage signals or current signals in the electric power system are collected through a sensor, the collected signals is subjected to appropriate treatment, and then first phase detection value Phi- and frequency detection valve Omega^ are obtained respectively through adopting the park transformation and the frequency control filtering, integration is performed to the Omega^, and finally, the detection value Theta of the phase of the voltage signals or the current signals of the electric power system can be obtained through plusing the Phi- and the Theta^. Through adopting the method, the new frequency and phase can be tracked quickly after the signal frequency and signal change, the frequency and the phase of the signal can be obtained accurately when the signal is interfered or polluted, the control and stability of the electric power system can be promoted, the electric power and electronic devices in the electric power system can operate safely and reliably, and the power and frequency control on the distributed power generation or minitype electric power system can be facilitated.
Description
Technical field
The present invention relates to a kind of method that detects voltage signal in the electric system or current signal frequency and phase place, belong to electric power signal detection technique field.
Background technology
Phase place and the frequency of obtaining periodic signal have very important actual application value in electrical engineering.
In electrical engineering, the control of electric voltage frequency and phase differential each other is the necessary condition that guarantees the normal operation of electrical network within limits on electric system key node and the section.Take place in the process of static state, dynamic buckling in electric system, the phase change of key node is to analyze the important information of its unstability process development and instability Mechanism.This just requires, and no matter Operation of Electric Systems still is in dynamic adjustment process in steady state (SS), can both obtain the frequency and the phase place of system accurately and rapidly.In addition, frequency and the phase place that obtains system voltage accurately and rapidly also has significant application value for the power supply quality that improves power distribution network.In power distribution network, there are numerous power quality problems such as idle, harmonic wave, negative phase-sequence, flickering and electric voltage dropping.High power electronic equipment is a best means of improving these problems, such as static reacance generator (STATCOM), active power filter (APF), uninterrupted power supply (ups) Unity, dynamic electric voltage recovery device (DVR) or the like.They will finish the task of improving the quality of power supply, must realize its bucking voltage/electric current and the synchronous problem of system voltage/electric current.When electric system caused system voltage and SPA sudden phase anomalies because of faults such as distant place short circuits, stationary problem was particularly important.This moment the correct basis of improving the quality of power supply of being not only synchronously, not overcurrent, overvoltage of control compensation device especially makes the important assurance of its safe and reliable operation.New forms of energy such as wind-power electricity generation, solar electrical energy generation form by distributed power generation, micro power network often link to each other with electric system, at this moment, also need to keep synchronous on these mini systems and electric system access point frequency and the phase place.
Voltage signal or current signal method for detecting phases commonly used now comprise: zero passage detection, inverse trigonometric function calculate and phaselocked loop.Zero passage detection is at the zero point of the positive going zeror crossing of voltage signal or the current signal moment as voltage signal or current signal phase place, afterwards, according to the rated frequency calculating voltage signal of system or the phase place of current signal, up to the next positive going zeror crossing moment of voltage signal or current signal.This method can't obtain phase information accurately between two zero crossings, system frequency can produce the detection error when skew takes place, and very easily is subjected to harmonic wave and interference of noise, causes detecting mistake.Inverse trigonometric function calculating is meant and utilizes inverse trigonometric function, directly calculates the phase place of sinusoidal signal.This method suffers harmonic wave and interference of noise equally easily, produces bigger detection error.Phaselocked loop is by closed-loop control, by the detected value of calculating voltage signal or current signal and the error of actual value, revises detected value constantly, to obtain detected value accurately.The response speed of this method is slow, and harmonic wave and noise still can cause output error.Because now there is above-mentioned shortcoming in existing these detection methods, make in actual applications, can not accurately, promptly detect the phase place of electric system, be unfavorable for the control of electric system and stable; Can influence operate as normal such as static reacance generator, active power filter, uninterrupted power source, dynamic electric voltage recovery device, even can cause their overcurrents, overvoltage, can damage these equipment when serious; The power and the frequency control that are unfavorable for distributed power generation or micro power network.
Summary of the invention
The present invention seeks to propose a kind of method that detects voltage signal in the electric system or current signal frequency and phase place, overcome the shortcoming of prior art, to avoid harmonic wave and interference of noise, detect the frequency and the phase place of power system voltage signal or current signal rapidly and accurately.
The method of voltage signal or current signal frequency and phase place in the detection electric system that the present invention proposes comprises following each step:
(1) utilize the voltage signal or the current signal of sensor acquisition electric system: if electric system is a three-phase system, the signal of collection is designated as v
a, v
b, v
c, utilize the Clarke conversion with v
a, v
b, v
cBe transformed to two paths of signals v
α, v
βIf electric system is a monophase system, the signal of collection is designated as v
In, and with v
InAs signal v
α, utilize Hilbert transform to obtain signal v
β
(2) establish the required phase place of Parker conversion
Initial value be 0, to above-mentioned two paths of signals v
α, v
βCarry out the Parker conversion and obtain signal v
D1, v
Q1
(3) according to above-mentioned signal v
D1, v
Q1, calculate v
D1With v
D1Time-delay
The mean value v of back signal
D2, calculate v
D2With v
D2Time-delay
The mean value v of back signal
D3, calculate v
D3With v
D3Time-delay
After signal averaging v
D4, calculate v
D4With v
D4Time-delay
After the signal v that averages
D5, to v
D5Carry out low-pass filtering, obtain v
dCalculate v
Q1With v
Q1Time-delay
The mean value v of back signal
Q2, calculate v
Q2With v
Q2Time-delay
The mean value v of back signal
Q3, calculate v
Q3With v
Q3Time-delay
After signal averaging v
Q4, calculate v
Q4With v
Q4Time-delay
After the signal v that averages
Q5, to v
Q5Carry out low-pass filtering, obtain v
q, wherein
Power frequency period for electric system;
(4) establish the initial phase detected value of power system voltage signal or current signal
Initial value be 0, the v that above-mentioned steps (3) is obtained
dWith
Sine value multiply each other, obtain first calculated value, the v that above-mentioned steps (3) is obtained
qWith
Cosine value multiply each other, obtain second calculated value, second calculated value is deducted first calculated value, obtain the actual value of power system voltage signal or current signal initial phase
With the initial phase detected value
Error, be designated as
(5) right
Carry out proportional integral, obtain the initial phase detected value
(6) to the v of above-mentioned steps (3)
dDifferentiate makes the v of derivative and above-mentioned steps (3)
qMultiply each other, obtain the 3rd calculated value, to the v of above-mentioned steps (3)
qDifferentiate makes the v of derivative and above-mentioned steps (3)
dMultiply each other, obtain the 4th calculated value, the 3rd calculated value deducts the 4th calculated value, obtains power system voltage signal or current signal angular frequency actual value ω and detected value
Error, be designated as e
ω
(7) the disturbance threshold value v of power system voltage of setting or electric current
Th, to the e of above-mentioned steps (6)
ωTake absolute value, differentiate again obtains the 5th calculated value, with the 5th calculated value and disturbance threshold value v
ThCompare, if the 5th calculated value is greater than v
Th, the T after the disturbance then
bConstantly, make e
ωBe 0, if the 5th calculated value is less than or equal to v
Th, e then
ωRemain unchanged, wherein T
bBe the disturbance shielding time;
(8) to the e of above-mentioned steps (7)
ωCarry out proportional integral, obtain the detected value of power system voltage signal or current signal angular frequency
(9) to above-mentioned steps (8)
Carry out integration, obtain the required phase place of Parker conversion
(10) make the initial phase detected value of above-mentioned steps (5)
With above-mentioned steps (9)
Addition obtains the detected value θ of power system voltage signal or current signal phase place;
(11) use the power system voltage signal of step (5) or the detected value of current signal initial phase
And the required phase place of Parker conversion of step (9)
The detection to voltage signal in the electric system or current signal frequency and phase place is realized in repeating step (1)～(10).
The method of voltage signal or current signal frequency and phase place in the detection electric system that the present invention proposes, its advantage is:
1, the inventive method has response speed and good filtering effect fast, can follow the tracks of new frequency and phase place rapidly in signal frequency and the phase place back that changes, can be when signal be interfered and pollute the frequency of picked up signal and phase place accurately;
2, the inventive method can accurately, promptly detect the phase place of electric system, helps the control of electric system and stable;
3, the inventive method can guarantee the operate as normal of equipment such as static reacance generator in the electric system, active power filter, uninterrupted power source, dynamic electric voltage recovery device, when guaranteeing that there is big disturbance in they in system, not overcurrent, not overvoltage guarantees that they move safely and reliably;
4, the inventive method helps the power and the frequency control of distributed power generation or miniature electric system.
Description of drawings
Fig. 1 be when electric system be three phase times, the FB(flow block) of the inventive method.
Fig. 2 is when electric system when being single-phase, utilizes the synoptic diagram of Hilbert (Hilbert) conversion process monophase system acquired signal in the inventive method.
Fig. 3 is the process flow diagram of frequency control filtering.
Fig. 4 is the process flow diagram of frequency error reconstruct.
Fig. 5 is an input three-phase voltage symmetry and when not containing harmonic wave, the phase place that obtains with the inventive method.
Fig. 6 is an input three-phase voltage when containing harmonic wave, the phase place that obtains with the inventive method.
Fig. 7 is an input three-phase voltage when containing harmonic wave, the phase place that obtains with the inventive method.
Fig. 8 is that the input three-phase voltage is at 20ms moment phase hit 30 degree, with the phase place of the inventive method acquisition.
Fig. 9 is that input three-phase voltage frequency is when 20ms increases by 1 hertz constantly, with the frequency of the inventive method acquisition.
Embodiment
The method of voltage signal or current signal frequency and phase place in the detection electric system that the present invention proposes, its FB(flow block) comprises following each step as shown in Figure 1:
(1) utilize the voltage signal or the current signal of sensor acquisition electric system: if electric system is a three-phase system, the signal of collection is designated as v
a, v
b, v
c, utilize Clarke (Clarck) conversion with v
a, v
b, v
cBe transformed to two paths of signals v
α, v
βThe Clarke transformation matrix is
If electric system is a monophase system, the signal of collection is designated as v
In, and with v
InAs signal v
α, utilize Hilbert (Hilbert) conversion to obtain signal v
β, as shown in Figure 2:
(2) establish the required phase place of Parker conversion
Initial value be 0, to above-mentioned two paths of signals v
α, v
βCarry out Parker (Park) conversion and obtain signal v
D1, v
Q1, the Parker transformation matrix is
In the formula (2),
Can utilize
Obtain by integration, should be earlier with
Be made as the frontal eminence frequency of electric system, constantly revise by closed loop then, to obtain the exact value of system angle frequency;
(3) according to above-mentioned signal v
D1, v
Q1The time delayed signal elimination algorithm compares to common wave filter and has filter effect and quicker response better, be very suitable for the low-frequency disturbance in the filtering direct current signal, be repeatedly used the time delayed signal elimination algorithm can the filtering frequency all following harmonic waves, and then in conjunction with low-pass filter, filtering higher hamonic wave and noise, detailed process at first calculate v as shown in Figure 3
D1With v
D1Time-delay
The mean value v of back signal
D2, calculate v
D2With v
D2Time-delay
The mean value v of back signal
D3, calculate v
D3With v
D3Time-delay
After signal averaging v
D4, calculate v
D4With v
D4Time-delay
After the signal v that averages
D5To v
D5Carry out low-pass filtering, obtain v
dCalculate v
Q1With v
Q1Time-delay
The mean value v of back signal
Q2, calculate v
Q2With v
Q2Time-delay
The mean value v of back signal
Q3, calculate v
Q3With v
Q3Time-delay
After signal averaging v
Q4, calculate v
Q4With v
Q4Time-delay
After the signal v that averages
Q5, to v
Q5Carry out low-pass filtering, obtain v
q, wherein
Power frequency period for electric system;
(4) establish the initial phase detected value of power system voltage signal or current signal
Initial value be 0, the v that above-mentioned steps (3) is obtained
dWith
Sine value multiply each other, obtain first calculated value, the v that above-mentioned steps (3) is obtained
qWith
Cosine value multiply each other, obtain second calculated value, second calculated value is deducted first calculated value, obtain the actual value of power system voltage signal or current signal initial phase
With the initial phase detected value
Error, be designated as
(5) right
Carry out proportional integral, obtain the initial phase detected value
(6) to the v of above-mentioned steps (3)
dDifferentiate makes the v of derivative and above-mentioned steps (3)
qMultiply each other, obtain the 3rd calculated value, to the v of above-mentioned steps (3)
qDifferentiate makes the v of derivative and above-mentioned steps (3)
dMultiply each other, obtain the 4th calculated value, the 3rd calculated value deducts the 4th calculated value, obtains power system voltage signal or current signal angular frequency actual value ω and detected value
Error, be designated as e
ω, as shown in Figure 4;
(7) when input signal generation SPA sudden phase anomalies and frequency discontinuity, the output e of frequency error detection link
ωHas different characteristics, e when phase hit takes place
ωHave steeper rising edge, during the sudden change of input signal amplitude, e
ωCan produce precipitous rising edge equally, this specific character can be used for rejecting and disturb, and guarantees the accuracy of frequency detecting.Specific practice is: the disturbance threshold value v that sets a power system voltage or electric current
Th, to the e of above-mentioned steps (6)
ωTake absolute value, differentiate again obtains the 5th calculated value, with the 5th calculated value and disturbance threshold value v
ThCompare, if the 5th calculated value is greater than v
Th, the T after the disturbance then
bConstantly, make e
ωBe 0, if the 5th calculated value is less than or equal to v
Th, e then
ωRemain unchanged, wherein T
bBe the disturbance shielding time;
(8) to the e of above-mentioned steps (7)
ωCarry out proportional integral, obtain the detected value of power system voltage signal or current signal angular frequency
(9) to above-mentioned steps (8)
Carry out integration, obtain the required phase place of Parker conversion
(10) make the initial phase detected value of above-mentioned steps (5)
With above-mentioned steps (9)
Addition obtains the detected value θ of power system voltage signal or current signal phase place;
(11) use the power system voltage signal of step (5) or the detected value of current signal initial phase
And the required phase place of Parker conversion of step (9)
The detection to voltage signal in the electric system or current signal frequency and phase place is realized in repeating step (1)～(10).
By simulation result as can be seen:
1, no matter be to contain harmonic wave in the voltage, still the voltage signal that causes because of electric network fault is asymmetric, the present invention can both detect the phase place of input signal fundamental positive sequence exactly, when Figure 5 shows that input three-phase voltage symmetry and not containing harmonic wave, uses the inventive method to detect the phase place that obtains.Figure 6 shows that when the input three-phase voltage contains harmonic wave, use the inventive method to detect the phase place that obtains.Figure 7 shows that when the input three-phase voltage contains harmonic wave, use the inventive method to detect the phase place that obtains.
2, when input voltage signal phase place generation saltus step, only need just can to detect exactly about 10ms the phase place after the variation, as shown in Figure 8; When the input voltage signal frequency changes, need just can detect frequency exactly about 30ms.Shown in Figure 9 is to import the three-phase voltage frequency when 20ms increases by 1 hertz constantly, uses the inventive method to detect the frequency that obtains.
Claims (1)
1. method that detects voltage signal in the electric system or current signal frequency and phase place is characterized in that this method comprises following each step:
(1) utilize the voltage signal or the current signal of sensor acquisition electric system: if electric system is a three-phase system, the signal of collection is designated as v
a, v
b, v
c, utilize the Clarke conversion with v
a, v
b, v
cBe transformed to two paths of signals v
α, v
βIf electric system is a monophase system, the signal of collection is designated as v
In, and with v
InAs signal v
α, utilize Hilbert transform to obtain signal v
β
(2) establish the required phase place of Parker conversion
Initial value be 0, to above-mentioned two paths of signals v
α, v
βCarry out the Parker conversion and obtain signal v
D1, v
Q1
(3) according to above-mentioned signal v
D1, v
Q1, calculate v
D1With v
D1Time-delay
The mean value v of back signal
D2, calculate v
D2With v
D2Time-delay
The mean value v of back signal
D3, calculate v
D3With v
D3Time-delay
After signal averaging v
D4, calculate v
D4With v
D4Time-delay
After the signal v that averages
D5, to v
D5Carry out low-pass filtering, obtain v
dCalculate v
Q1With v
Q1Time-delay
The mean value v of back signal
Q2, calculate v
Q2With v
Q2Time-delay
The mean value v of back signal
Q3, calculate v
Q3With v
Q3Time-delay
After signal averaging v
Q4, calculate v
Q4With v
Q4Time-delay
After the signal v that averages
Q5, to v
Q5Carry out low-pass filtering, obtain v
q, wherein
Power frequency period for electric system;
(4) establish the initial phase detected value of power system voltage signal or current signal
Initial value be 0, the v that above-mentioned steps (3) is obtained
dWith
Sine value multiply each other, obtain first calculated value, the v that above-mentioned steps (3) is obtained
qWith
Cosine value multiply each other, obtain second calculated value, second calculated value is deducted first calculated value, obtain the actual value of power system voltage signal or current signal initial phase
With the initial phase detected value
Error, be designated as
(5) right
Carry out proportional integral, obtain the initial phase detected value
(6) to the v of above-mentioned steps (3)
dDifferentiate makes v
dDerivative and the v of above-mentioned steps (3)
qMultiply each other, obtain the 3rd calculated value, to the v of above-mentioned steps (3)
qDifferentiate makes v
qDerivative and the v of above-mentioned steps (3)
dMultiply each other, obtain the 4th calculated value, the 3rd calculated value deducts the 4th calculated value, obtains the detected value of power system voltage signal or current signal angular frequency actual value ω and angular frequency
Error, be designated as e
ω
(7) the disturbance threshold value v of power system voltage of setting or electric current
Th, to the e of above-mentioned steps (6)
ωTake absolute value, differentiate again obtains the 5th calculated value, with the 5th calculated value and disturbance threshold value v
ThCompare, if the 5th calculated value is greater than v
Th, the T after the disturbance then
bConstantly, make e
ωBe 0, if the 5th calculated value is less than or equal to v
Th, e then
ωRemain unchanged, wherein T
bBe the disturbance shielding time;
(8) to the e of above-mentioned steps (7)
ωCarry out proportional integral, obtain the detected value of power system voltage signal or current signal angular frequency
(9) to above-mentioned steps (8)
Carry out integration, obtain the required phase place of Parker conversion
(10) make the initial phase detected value of above-mentioned steps (5)
The required phase place of Parker conversion with above-mentioned steps (9)
Addition obtains the detected value θ of power system voltage signal or current signal phase place;
(11) use the power system voltage signal of step (5) or the detected value of current signal initial phase
And the required phase place of Parker conversion of step (9)
The detection to voltage signal in the electric system or current signal frequency and phase place is realized in repeating step (1)～(10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110347668 CN102385003B (en) | 2011-11-07 | 2011-11-07 | Method for detecting frequency and phase of voltage signals or current signals in electric power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110347668 CN102385003B (en) | 2011-11-07 | 2011-11-07 | Method for detecting frequency and phase of voltage signals or current signals in electric power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102385003A CN102385003A (en) | 2012-03-21 |
| CN102385003B true CN102385003B (en) | 2013-07-24 |
Family
ID=45824625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110347668 Active CN102385003B (en) | 2011-11-07 | 2011-11-07 | Method for detecting frequency and phase of voltage signals or current signals in electric power system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102385003B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621382B (en) * | 2012-03-22 | 2013-12-11 | 清华大学 | Method for detecting frequency, phase and amplitude of electric signal in electric power system |
| CN102809688B (en) * | 2012-07-13 | 2014-08-13 | 中冶南方工程技术有限公司 | Method for calculating three-phase voltage real-time phase based on Iterative Fourier transform |
| TW201416682A (en) * | 2012-10-30 | 2014-05-01 | Taiwan Power Co | Method, system, and apparatus for detecting high-voltage feeder power phase |
| CN103344815B (en) * | 2013-06-08 | 2015-08-19 | 中国农业大学 | A kind of measurement of electric parameter method and system of wide region change |
| CN104280610B (en) * | 2014-10-10 | 2017-03-29 | 深圳晶福源科技股份有限公司 | A kind of method of phaselocked loop machine and its detection mains frequency |
| CN104535836B (en) * | 2014-12-29 | 2017-05-10 | 广东电网有限责任公司电力科学研究院 | Electric signal fundamental frequency measuring method and system |
| CN105445547B (en) * | 2015-07-09 | 2018-05-25 | 深圳市科润宝实业有限公司 | The frequency detecting method and system of sinusoidal signal |
| CN105356471A (en) * | 2015-11-30 | 2016-02-24 | 安徽理工大学 | Software phase-locked loop applicable to nonideality power grid condition |
| CN105467207B (en) * | 2016-01-19 | 2019-07-19 | 江苏省电力公司电力科学研究院 | A kind of high-accuracy voltage power frequency measuring system and method based on intelligent substation |
| CN106124930A (en) * | 2016-06-24 | 2016-11-16 | 华北水利水电大学 | A kind of micro-capacitance sensor fault detection method based on differential voltage and device |
| CN106680583B (en) * | 2016-12-27 | 2019-03-29 | 东南大学 | A kind of method of non-equilibrium power system frequency estimation |
| CN110470904A (en) * | 2019-07-11 | 2019-11-19 | 中国农业大学 | Synchronous phasor measuring method and device based on flat window filter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0087700A1 (en) * | 1982-02-24 | 1983-09-07 | Mitsubishi Denki Kabushiki Kaisha | System for detecting a predetermined phase relation between two input electrical quantities detected from an electric power system |
| CN1382995A (en) * | 2002-04-24 | 2002-12-04 | 清华大学 | Digital measuring method of frequency and phase |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101617234B (en) * | 2006-11-06 | 2012-05-23 | 歌美飒创新技术公司 | Advanced real-time grid monitoring system |
-
2011
- 2011-11-07 CN CN 201110347668 patent/CN102385003B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0087700A1 (en) * | 1982-02-24 | 1983-09-07 | Mitsubishi Denki Kabushiki Kaisha | System for detecting a predetermined phase relation between two input electrical quantities detected from an electric power system |
| CN1382995A (en) * | 2002-04-24 | 2002-12-04 | 清华大学 | Digital measuring method of frequency and phase |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102385003A (en) | 2012-03-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102385003B (en) | Method for detecting frequency and phase of voltage signals or current signals in electric power system | |
| CN102621382B (en) | Method for detecting frequency, phase and amplitude of electric signal in electric power system | |
| Hadjidemetriou et al. | A new hybrid PLL for interconnecting renewable energy systems to the grid | |
| CN101793918B (en) | Voltage sag detection method | |
| CN104155537B (en) | Island detection method adopting low-frequency sinusoidal phase perturbation | |
| CN102401858A (en) | Method for detecting fundamental component and harmonic component of voltage of power grid | |
| CN104135003B (en) | APF control method based on active disturbance rejection and repetitive control | |
| CN105425011B (en) | A kind of non-linear width phase detection method suitable for single-phase network deformation | |
| CN102868183A (en) | Sliding-mode variable structure control method of single phase grid-connected inverter based on multi-resonant sliding mode surface | |
| CN103269086A (en) | Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter | |
| CN103472301A (en) | Method and system for extracting positive sequence component and negative sequence component of network voltage | |
| CN104466966A (en) | Calculation method for sub-frequency harmonic compensation of APF under multiple synchronous rotating reference frames | |
| Pereira et al. | Influence of PLL in wind parks harmonic emissions | |
| CN103323651B (en) | Based on the variable step affine projection harmonic current detecting method that time coherence is average | |
| CN103592984B (en) | Method for decomposing and reconstructing current instantaneous sequence component of triangular connection current transformer | |
| CN103199563A (en) | Initiative frequency shift type island detection method of low-output-current harmonic content | |
| Mohiti et al. | A hybrid micro grid islanding detection method | |
| Sivasankar et al. | Decoupled stationary reference frame pll for interconnecting renewable energy systems to the grid | |
| Li et al. | Islanding detection for microgrid based on frequency tracking using extended Kalman filter algorithm | |
| Cisneros-Saldana et al. | Voltage-Based Frequency Synchronization for Phasor Measurements in Microgrid Protection | |
| Mäkinen et al. | Power hardware in-the-loop laboratory test environment for small scale wind turbine prototype | |
| Bimenyimana et al. | Fault Ride-Through (FRT) Behavior in VSC-HVDC as Key Enabler of Transmission Systems Using SCADA Viewer Software | |
| Wang et al. | Enhanced single phase locked loop for grid-connected converter in distribution network | |
| Zhang et al. | A novel digital phase-locked-loop for single-phase grid-connected power generation systems | |
| Shang et al. | Amplitude-phase-locked loop: Estimator of three-phase grid voltage vector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Liang Inventor after: Jiang Qirong Inventor after: Hong Lucheng Inventor before: Wang Liang Inventor before: Jiang Qirong |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: WANG LIANG JIANG QIRONG TO: WANG LIANG JIANG QIRONG HONG LUCHENG |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |