CN101877587A - Novel soft phase-locked loop - Google Patents
Novel soft phase-locked loop Download PDFInfo
- Publication number
- CN101877587A CN101877587A CN201010213886XA CN201010213886A CN101877587A CN 101877587 A CN101877587 A CN 101877587A CN 201010213886X A CN201010213886X A CN 201010213886XA CN 201010213886 A CN201010213886 A CN 201010213886A CN 101877587 A CN101877587 A CN 101877587A
- Authority
- CN
- China
- Prior art keywords
- phase
- locked loop
- filter
- frequency
- novel soft
- 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
Links
- 230000004044 response Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 24
- 230000000694 effects Effects 0.000 claims description 6
- 230000000454 anti-cipatory effect Effects 0.000 claims description 5
- 238000013016 damping Methods 0.000 claims description 4
- 230000006872 improvement Effects 0.000 claims description 3
- 230000002411 adverse Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Abstract
The invention mainly provides a novel soft phase-locked loop, which is an improved soft phase-locked loop based on a wave trap and a low-pass filter. The novel soft phase-locked loop can accurately and quickly detect the amplitude and the phase of a positive-sequence component of power network voltage when a power network has an unsymmetrical fault, so the novel soft phase-locked loop not only can effectively inhibit phase 100 Hz disturbances, but also has a quick response speed, has high stability and high disturbance resisting capacity, is helpful for improving the dynamic control performance of a network-side converter when the power network has the unsymmetrical fault, and provides a guarantee for a low-voltage traversing technique of a wind power generation system.
Description
Technical field
The present invention relates to wind power generation field, be specifically related to a kind of novel soft phase-locked loop based on the filter that has trap and low-pass filtering function concurrently.
Background technology
Wind power generation is the forms of electricity generation of the most ripe, the tool exploitation scale of technology and commercialized development prospect in the development and use of world today regenerative resource, accurately obtaining of synchronized information is the key of the wind-powered electricity generation unit being carried out power control, the vector control strategy of the net side converter of wind-powered electricity generation unit is based on electrical network fundamental positive sequence voltage and carries out directed, when electrical network normally moves, soft phase-locked loop can be applied to the observation of electrical network fundamental positive sequence voltage-phase, has characteristics such as Phase Tracking is level and smooth, quick, flexibility is better.Continuous increase along with wind power generation scale and wind-powered electricity generation unit single-machine capacity, at present a lot of standards all require the wind-powered electricity generation unit can be under electric network fault (as Voltage unbalance) to a certain degree still can operate as normal, therefore needing accurately and rapidly under the electric network fault situation, the amplitude and the phase place of detection of grid voltage make control reach good effect.
Phase-locked loop generally is made up of phase discriminator, filter, adjuster and oscillator.Phase-locked loop is one makes output signal (being produced by oscillator) and reference signal or input signal synchronous circuit on frequency and phase place, at synchronous (being commonly referred to locking) state, phase difference between oscillator output signal and the reference signal is zero, perhaps keeps constant.If phase error, a kind of control mechanism affacts on the oscillator, makes phase error be reduced to minimum once more.In such control system, the phase locking of real output signal is to the phase place of reference signal.If the function of phase-locked loop is no longer used some dedicated hardware implementation, but use software, finish, be the soft phase-locked loop technology with computer program.In the electric power system normal course of operation, soft phase-locked loop (SPLL) can be realized the function to the accurate observation of electrical network fundamental positive sequence voltage-phase.
Yet, line voltage contains positive sequence component, negative sequence component and harmonic component, soft phase-locked loop had both required response speed faster, require enough antijamming capabilities again, wherein, the main task of adjuster is to satisfy phase-locked rapidity requirement, and the main task of filtering link is filtering q axle frequency multiplication ripple and higher harmonic components.But the two is a contradiction, and at above problem, existing considerable document has proposed various solutions.For the design of filtering link, have and propose to adopt the method for T/4 time-delay to separate line voltage positive sequence and negative sequence component, but used T/4 is a definite value, in case during the mains frequency fluctuation, this method can't accurately be separated electrical network positive sequence and negative sequence component; For adjuster is design, has to propose to use pi regulator, adopts the phase locking loop controlling method that becomes the PI parameter, and the type method has a defective: when the mains frequency fluctuation was big, there was oscillation problem in phase-locked loop.When electrical network generation unbalanced fault, because the rotary speed of the positive and negative sequence voltage resultant vector of electrical network has fluctuateed twice in a power frequency period, therefore there is the 100Hz fluctuation in the phase place that adopts soft phase-locked loop to obtain.At present, generally adopt the method that reduces the soft phase-locked loop closed-loop bandwidth to suppress phase place 100Hz fluctuation on the engineering, but can reduce the SPLL response speed, cause net side converter overcurrent or overvoltage during serious unbalanced fault takes place electrical network easily.Therefore, present stage soft phase-locked loop can't realize Phase Tracking level and smooth, fast, suppress that fluctuation, antijamming capability are strong, flexibility function preferably.
Summary of the invention
The objective of the invention is to propose a kind of novel soft phase-locked loop, this soft phase-locked loop is a kind of modified model soft phase-locked loop based on trapper and low pass filter.
Technical scheme provided by the invention is:
A kind of novel soft phase-locked loop based on the filter that has trap and low-pass filtering function concurrently, by phase discriminator, filter, adjuster and voltage controlled oscillator are formed, phase discriminator, filter, adjuster and oscillator are cascaded structure, the input signal of described phase discriminator is a three-phase voltage, the output of described phase discriminator is received the input of filter, the output of described filter is received the input of adjuster, the output of described adjuster is received the input of oscillator, the output signal of oscillator is the output signal of phase-locked loop, wherein, the filter that has trap and low-pass filtering function concurrently is 4 rank filters of Butterworth 2 rank band stop filters and 2 rank low pass filter cascades.
Wherein, described phase discriminator adopts the multiplication phase discriminator, and its output signal and its phase of input signals error are proportional, if phase error is θ
e, the output signal of phase discriminator is u
q, and phase error is less, and then its proportionate relationship is u
q≈ K θ
e, wherein K is a phase detector gain, unit is the every volt of radian (rad/V).
Wherein, described filter is low pass filter and band stop filter cascade structure, low pass filter can rejection frequency be higher than the high order harmonic component of its cut-off frequency, band stop filter can the filtering specific times harmonic, and the filter of low pass filter and band stop filter cascade structure can filtering high frequency and frequency multiplication component.
Wherein, described adjuster adopts the PI proportional-integral controller, can make system increase an open loop pole that is positioned at initial point, increase an open loop zero simultaneously, the limit that increases can improve the no margin of system, reduces or eliminates steady-state error, the steady-state behaviour of improvement system, the damping degree that can increase system zero point that increases, overcome the adverse effect of controller to the stability of a system and dynamic process generation, the anticipatory control device has the leading effect of phase place, the response time that can improve phase-locked loop.
Wherein said voltage controlled oscillator can be exported pulse, and its frequency is relevant with input variable.
The advantage of technical solution of the present invention is: novel soft phase-locked loop of the present invention can be realized when electrical network generation unbalanced fault, the amplitude of detection of grid voltage positive sequence component and phase place accurately and rapidly, can not only effectively suppress phase place 100Hz disturbance, and response speed is fast, stability is good, antijamming capability is strong, help to improve the dynamic control performance of net side converter during the electrical network unbalanced fault, for wind generator system low-voltage crossing technology provides guarantee.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing.
Fig. 1 is this novel soft phase-locked loop schematic vector diagram.
Fig. 2 is that this novel soft phase-locked loop structure realizes block diagram.
Fig. 3 is this novel soft phase-locked loop small-signal model schematic diagram.
Fig. 4 is the frequency characteristic figure of this novel soft phase-locked loop median filter.
Fig. 5 is Bode diagram and the step response curve that this novel soft phase-locked loop adds the filtering link.
Fig. 6 is Bode diagram and the step response curve that this novel soft phase-locked loop does not add the filtering link.
Fig. 7 is this novel soft phase-locked loop step response curve in the electricity generation system in wind.
Embodiment
Technical scheme of the present invention is: a kind of novel soft phase-locked loop, the course of work of this soft phase-locked loop is based on the abc-dq coordinate system transformation, as shown in Figure 1, promptly based on the conversion of synchronous rotating frame, two-phase synchronous rotating frame (dq) is being rotated counterclockwise with line voltage first-harmonic angular frequency, and the angle of d axle and a axle is θ, establishes the line voltage vector to be
Then line voltage is u at the component of dq axle
d, u
q, u as seen from the figure
qD axle and line voltage have been reflected
Phase relation.u
q＞0 o'clock, the d axle lagged behind
Should increase synchronous signal frequency; u
q＜0 o'clock, the d axle was leading
Should reduce synchronous signal frequency; u
q=0 o'clock, the d axle with
Homophase.Therefore, can make u by control
q=0 realize phase-locked.Shown in Fig. 1, abc is three phase coordinate systems, and dq is a synchronous rotating frame, u
d, u
qBe the dq component of voltage vector under the dq coordinate system.
Based on above operation principle, SPLL specific implementation block diagram as shown in Figure 2, promptly this soft phase-locked loop is to be made of phase discriminator, filter, adjuster and oscillator.Phase discriminator, filter, adjuster and oscillator are cascaded structure, the input signal that is phase discriminator is a three-phase voltage, its output is received the input of filter, the output of filter is received the input of adjuster, the output of adjuster is received the input of oscillator, and the output signal of oscillator is the output signal of phase-locked loop.To the filtering of frequency multiplication component in the dq coordinate, can adopt low pass filter also can adopt trapper.But low pass filter band is narrow, in filtering frequency multiplication component, can influence the phase-locked loop dynamic property, can not realize the function of rapidity; And trapper only is designed to 2 ω with the trap angular frequency, and trapper can filtering frequency multiplication component like this, but can not filtering 2 subharmonic high order harmonic component in addition.Therefore, take all factors into consideration dynamic effect and accuracy of detection, the present invention proposes a kind of filter that has trap and low-pass filtering function concurrently, i.e. 4 rank filters of Butterworth 2 rank band stop filters and 2 rank low pass filter cascades.Wherein, the cut-off frequency of Butterworth 2 rank band stop filters is f
C1, the cut-off frequency of 2 rank low pass filters is f
C2, this filter passes function and can be expressed as in the S territory
Wherein, a
4, a
3, a
2, a
1, a
0, b
4, b
3, a
2, b
1, b
0Be respectively constant coefficient.
For adjuster, the present invention adopts the anticipatory control link that system is optimized, and shortens the response time, satisfies the rapidity requirement of soft phase-locked loop, and this anticipatory control link can be expressed as in S territory transfer function
Wherein, a, T, aT are the adjuster coefficient.
This novel soft phase-locked loop small-signal model as shown in Figure 3, among the figure, H (s) is the filter link, C (s) is the adjuster link; Q wherein
*With q be voltage vector q axle component, H (s) is a filter transfer function, C (s) is the transfer function of adjuster, 1/s is the transfer function of oscillator.
In this novel soft phase-locked loop, it is that cut-off frequency is f that 4 rank filters are set
cButterworth 2 rank band stop filters and the cut-off frequency of=55Hz～195Hz are f
cThe 2 rank low pass filter cascades of=195Hz, then this filter can be expressed as at S territory biography function
Its frequency characteristic as shown in Figure 4.Shown in Fig. 4 is the amplitude-frequency and the phase-frequency characteristic curve of this phase-locked loop median filter, and wherein abscissa is a frequency, and ordinate is respectively amplitude and phase angle, as seen from the figure, when frequency was 100Hz, amplitude attenuation was 170dB, can reach the requirement of filtering frequency multiplication component.
Bring filtering link proposed by the invention into, the anticipatory control link that adjuster adopts the present invention to adopt, New type of S PLL closed loop frequency characteristic and step response after being improved.As seen from Figure 5, the SPLL step response adjustment time after the improvement is t
s=0.02s, phase margin are 90 °, and can suppress the 100Hz component in the control loop fully, and its performance satisfies the inhibition and the response speed requirement fast of frequency multiplication component fully.Shown in Fig. 5 is amplitude-frequency, phase-frequency characteristic curve and the response time curve of this phase-locked loop, wherein the abscissa of amplitude-frequency, phase-frequency characteristic curve is a frequency, ordinate is respectively amplitude and phase angle, as seen from the figure, and when frequency is 100Hz, amplitude attenuation is 190dB, can reach the requirement of filtering frequency multiplication component, the abscissa of response time curve is the time, as seen from the figure, response time is 0.025s, satisfies the requirement of the rapidity of phase-locked loop.
If do not consider the filtering link that the present invention proposes, adjuster adopts pi regulator, and then SPLL is a second-order system, and its closed loop transfer function, is
Wherein: natural hunting angle frequency
Damping ratio
K
p, K
iProportionality coefficient and integral coefficient for pi regulator.Get ξ=0.707 and be optimum damping ratio, design it and adjust time t
s=0.04s, K
p=236, K
i=14105, then the frequency characteristic of this soft phase-locked loop as shown in Figure 6.Shown in Fig. 6 is amplitude-frequency, phase-frequency characteristic curve and the response time curve that this phase-locked loop does not add filter link of the present invention, wherein the abscissa of amplitude-frequency, phase-frequency characteristic curve is a frequency, ordinate is respectively amplitude and phase angle, as seen from the figure, and when frequency is 100Hz, amplitude attenuation is 10dB, can not reach the requirement of filtering frequency multiplication component, the abscissa of response time curve is the time, as seen from the figure, response time is 0.06s, can not satisfy the requirement of the rapidity of phase-locked loop.Can be drawn by Fig. 6, the bandwidth of system is about 70Hz, but 100Hz component decay has only-8dB, and can there be the 100Hz fluctuation in the SPLL output phase during the electrical network unbalanced fault, can not satisfy the inhibition and the response speed requirement fast of frequency multiplication component.
As shown in Figure 7, be the step response curve of this phase-locked loop in wind generator system, wherein abscissa is the time, and ordinate is respectively the voltage-phase of output of system's positive sequence voltage phase place and this novel soft phase-locked loop and the voltage waveform of system voltage waveform and the output of this novel soft phase-locked loop.As seen from the figure, when 30 ° of system voltage positive sequence voltage phase hits, 30 ° of saltus steps also take place in the output voltage phase place of this novel soft phase-locked loop, the voltage waveform of this novel soft phase-locked loop output is being consistent with the system voltage waveform through after the adjusting of 0.02s, satisfies the requirement of fast, accurately obtaining electric network information.
Invention has been described according to specific exemplary embodiment herein.It will be conspicuous carrying out suitable replacement to one skilled in the art or revise under not departing from the scope of the present invention.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present invention, scope of the present invention is by appended claim definition.
Claims (5)
1. novel soft phase-locked loop based on the filter that has trap and low-pass filtering function concurrently, it is characterized in that: by phase discriminator, filter, adjuster and voltage controlled oscillator are formed, phase discriminator, filter, adjuster and oscillator are cascaded structure, the input signal of described phase discriminator is a three-phase voltage, the output of described phase discriminator is received the input of filter, the output of described filter is received the input of adjuster, the output of described adjuster is received the input of oscillator, the output signal of oscillator is the output signal of phase-locked loop, wherein, the filter that has trap and low-pass filtering function concurrently is 4 rank filters of Butterworth 2 rank band stop filters and 2 rank low pass filter cascades.
2. novel soft phase-locked loop as claimed in claim 1 is characterized in that: described phase discriminator, adopt the multiplication phase discriminator, and its output signal and its phase of input signals error are proportional, if phase error is θ
e, the output signal of phase discriminator is u
q, and phase error is less, and then its proportionate relationship is u
q≈ K θ
e, wherein K is a phase detector gain, unit is the every volt of radian (rad/V).
3. novel soft phase-locked loop as claimed in claim 2, it is characterized in that: described filter is low pass filter and band stop filter cascade structure, low pass filter can rejection frequency be higher than the high order harmonic component of its cut-off frequency, band stop filter can the filtering specific times harmonic, and the filter of low pass filter and band stop filter cascade structure can filtering high frequency and frequency multiplication component.
4. novel soft phase-locked loop as claimed in claim 3, it is characterized in that: described adjuster, adopt the PI proportional-integral controller, can make system increase an open loop pole that is positioned at initial point, increase an open loop zero simultaneously, the limit that increases can improve the no margin of system, reduce or eliminate steady-state error, the steady-state behaviour of improvement system, the damping degree that can increase system zero point that increases, overcome the adverse effect of controller to the stability of a system and dynamic process generation, the anticipatory control device has the leading effect of phase place, the response time that can improve phase-locked loop.
5. as the described novel soft phase-locked loop of claim 1-4, it is characterized in that: described voltage controlled oscillator can be exported pulse, and its frequency is relevant with input variable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010213886XA CN101877587A (en) | 2010-06-30 | 2010-06-30 | Novel soft phase-locked loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010213886XA CN101877587A (en) | 2010-06-30 | 2010-06-30 | Novel soft phase-locked loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101877587A true CN101877587A (en) | 2010-11-03 |
Family
ID=43020064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010213886XA Pending CN101877587A (en) | 2010-06-30 | 2010-06-30 | Novel soft phase-locked loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101877587A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868163A (en) * | 2012-09-10 | 2013-01-09 | 西安奥特迅电力电子技术有限公司 | Three-phase soft phase-locked ring for adaptive grid-connected converter |
| CN104022502A (en) * | 2014-06-09 | 2014-09-03 | 安徽赛瑞储能设备有限公司 | Power grid phase locking method for energy converting system |
| CN104901685A (en) * | 2015-05-20 | 2015-09-09 | 南京南瑞太阳能科技有限公司 | Phase-locked loop based on adaptive notch filter |
| CN105187055A (en) * | 2014-05-21 | 2015-12-23 | 罗伯特·博世有限公司 | Phase Lock Loop Circuit Having A Wide Bandwidth |
| CN108152588A (en) * | 2017-12-22 | 2018-06-12 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of grid phase detecting system and method |
| CN109406944A (en) * | 2018-11-16 | 2019-03-01 | 国网江苏省电力有限公司盐城供电分公司 | One kind is based on domestic electric network electrical energy parameter monitoring system and its monitoring method |
| CN109490617A (en) * | 2018-10-30 | 2019-03-19 | 国网江苏省电力有限公司南通供电分公司 | A kind of multifunctional household electrical power metering systems and its metering method |
| CN109490722A (en) * | 2018-10-30 | 2019-03-19 | 国网江苏省电力有限公司南通供电分公司 | A kind of dry-type current transformer Insulation Inspection System and its detection method |
| CN109541296A (en) * | 2018-11-16 | 2019-03-29 | 国网江苏省电力有限公司盐城供电分公司 | A kind of household electricity power calculation algorithms |
| CN109560811A (en) * | 2018-10-10 | 2019-04-02 | 湘潭大学 | A kind of enhanced phaselocked loop of three-phase |
| CN109725212A (en) * | 2018-11-16 | 2019-05-07 | 国网江苏省电力有限公司盐城供电分公司 | A kind of household electricity condition monitoring identifying system and its monitoring recognition methods |
| CN110495092A (en) * | 2016-12-16 | 2019-11-22 | 意大利科技研究基金会 | For controlling the method and system of brushless motor |
| CN111817713A (en) * | 2020-06-09 | 2020-10-23 | 华南理工大学 | High-voltage direct-current phase-locked loop capable of rapidly synchronizing voltage phases under symmetric faults and algorithm |
| CN113328743B (en) * | 2021-05-09 | 2024-02-20 | 深圳市禾望电气股份有限公司 | Method and system for eliminating frequency coupling effect of phase-locked loop of grid-connected device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005204091A (en) * | 2004-01-16 | 2005-07-28 | Daihen Corp | Pll circuit |
| CN101141100A (en) * | 2007-08-28 | 2008-03-12 | 清华大学 | LCL filtering based voltage type active rectifier steady control system and method |
| CN101291150A (en) * | 2007-04-20 | 2008-10-22 | 上海输配电股份有限公司 | Method of realizing single-phase phase-locked loop by software |
| CN101325335A (en) * | 2008-07-24 | 2008-12-17 | 清华大学 | Hyposynchronous damped control system |
-
2010
- 2010-06-30 CN CN201010213886XA patent/CN101877587A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005204091A (en) * | 2004-01-16 | 2005-07-28 | Daihen Corp | Pll circuit |
| CN101291150A (en) * | 2007-04-20 | 2008-10-22 | 上海输配电股份有限公司 | Method of realizing single-phase phase-locked loop by software |
| CN101141100A (en) * | 2007-08-28 | 2008-03-12 | 清华大学 | LCL filtering based voltage type active rectifier steady control system and method |
| CN101325335A (en) * | 2008-07-24 | 2008-12-17 | 清华大学 | Hyposynchronous damped control system |
Non-Patent Citations (1)
| Title |
|---|
| 张学广等: "双馈风力发电系统并网控制试验研究", 《电机与控制应用》 * |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868163B (en) * | 2012-09-10 | 2015-09-09 | 西安奥特迅电力电子技术有限公司 | A kind of self adaptation grid-connected converter three-phase soft phase-locked loop |
| CN102868163A (en) * | 2012-09-10 | 2013-01-09 | 西安奥特迅电力电子技术有限公司 | Three-phase soft phase-locked ring for adaptive grid-connected converter |
| CN105187055A (en) * | 2014-05-21 | 2015-12-23 | 罗伯特·博世有限公司 | Phase Lock Loop Circuit Having A Wide Bandwidth |
| CN105187055B (en) * | 2014-05-21 | 2020-12-08 | 罗伯特·博世有限公司 | Phase-locked loop circuit with wide bandwidth |
| CN104022502A (en) * | 2014-06-09 | 2014-09-03 | 安徽赛瑞储能设备有限公司 | Power grid phase locking method for energy converting system |
| CN104901685A (en) * | 2015-05-20 | 2015-09-09 | 南京南瑞太阳能科技有限公司 | Phase-locked loop based on adaptive notch filter |
| CN104901685B (en) * | 2015-05-20 | 2018-02-02 | 国家电网公司 | A kind of phaselocked loop based on adaptive notch filter |
| CN110495092A (en) * | 2016-12-16 | 2019-11-22 | 意大利科技研究基金会 | For controlling the method and system of brushless motor |
| CN108152588A (en) * | 2017-12-22 | 2018-06-12 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of grid phase detecting system and method |
| CN109560811A (en) * | 2018-10-10 | 2019-04-02 | 湘潭大学 | A kind of enhanced phaselocked loop of three-phase |
| CN109490617A (en) * | 2018-10-30 | 2019-03-19 | 国网江苏省电力有限公司南通供电分公司 | A kind of multifunctional household electrical power metering systems and its metering method |
| CN109490722A (en) * | 2018-10-30 | 2019-03-19 | 国网江苏省电力有限公司南通供电分公司 | A kind of dry-type current transformer Insulation Inspection System and its detection method |
| CN109541296A (en) * | 2018-11-16 | 2019-03-29 | 国网江苏省电力有限公司盐城供电分公司 | A kind of household electricity power calculation algorithms |
| CN109725212A (en) * | 2018-11-16 | 2019-05-07 | 国网江苏省电力有限公司盐城供电分公司 | A kind of household electricity condition monitoring identifying system and its monitoring recognition methods |
| CN109406944A (en) * | 2018-11-16 | 2019-03-01 | 国网江苏省电力有限公司盐城供电分公司 | One kind is based on domestic electric network electrical energy parameter monitoring system and its monitoring method |
| CN109725212B (en) * | 2018-11-16 | 2021-12-14 | 国网江苏省电力有限公司盐城供电分公司 | Household electricity consumption condition monitoring and identifying system and monitoring and identifying method thereof |
| CN111817713A (en) * | 2020-06-09 | 2020-10-23 | 华南理工大学 | High-voltage direct-current phase-locked loop capable of rapidly synchronizing voltage phases under symmetric faults and algorithm |
| CN111817713B (en) * | 2020-06-09 | 2022-04-26 | 华南理工大学 | High-voltage direct-current phase-locked loop capable of rapidly synchronizing voltage phases under symmetric faults and method |
| CN113328743B (en) * | 2021-05-09 | 2024-02-20 | 深圳市禾望电气股份有限公司 | Method and system for eliminating frequency coupling effect of phase-locked loop of grid-connected device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101877587A (en) | Novel soft phase-locked loop | |
| Ortega et al. | Comparison of different PLL implementations for frequency estimation and control | |
| CN102305886B (en) | Fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage | |
| CN103163363B (en) | Power grid voltage dropping testing algorithm for dynamic voltage restorer | |
| CN102931673B (en) | Controller and control method for suppressing commutation failure of direct-current transmission system after alternating-current fault clearing | |
| CN103267897B (en) | Three-phase-locked loop based on reversed Park conversion | |
| CN108599261B (en) | Phase locking method based on nonlinear PI and decoupling double-synchronous-coordinate-system phase-locked loop | |
| US11038512B2 (en) | Phase-locking apparatus and phase-locking method | |
| CN201830237U (en) | Soft phase locking ring based on wave filter | |
| CN102868183A (en) | Sliding-mode variable structure control method of single phase grid-connected inverter based on multi-resonant sliding mode surface | |
| CN105116195A (en) | Voltage drop detection method suitable for power grid voltage large harmonic content | |
| CN103399202A (en) | Phase locking method for control system of variable-speed pump storage group | |
| CN107732961A (en) | A kind of method that sub-synchronous oscillation suppression is realized based on grid-connection converter control | |
| CN105680854A (en) | Phase-locked loop and phase locking method | |
| Ortega et al. | Impact of frequency estimation for VSC-based devices with primary frequency control | |
| Wang et al. | A novel phase-locked loop for mitigating the subsequent commutation failures of LCC-HVDC systems | |
| CN103414204A (en) | Control method for using dynamic voltage to compensate wind power generation system output reactive power | |
| Lacerda et al. | Phasor modeling approaches and simulation guidelines of voltage-source converters in grid-integration studies | |
| Tian et al. | Transient characteristics and adaptive fault ride through control strategy of DFIGs considering voltage phase angle jump | |
| Zevallos et al. | Control of photovoltaic inverters for transient and voltage stability enhancement | |
| CN103259284B (en) | Voltage vector stabilizer based on phase-locked loop and control method of voltage vector stabilizer | |
| Ravanji et al. | Impact of voltage-loop feedforward terms on the stability of grid-forming inverters and remedial actions | |
| Aali et al. | Adaptive filtering with robust controller for improvement of inertial response of wind turbine | |
| CN105467252A (en) | Three-phase photovoltaic inverter active anti-islanding method based on reactive power disturbance | |
| CN103023069B (en) | Fault ride-through control method for inversion type new energy power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20130219 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130219 Address after: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant after: China Electric Power Research Institute Applicant after: State Grid Corporation of China Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant before: China Electric Power Research Institute |
|
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20101103 |