CN103163363A - Power grid voltage dropping testing algorithm for dynamic voltage restorer - Google Patents
Power grid voltage dropping testing algorithm for dynamic voltage restorer Download PDFInfo
- Publication number
- CN103163363A CN103163363A CN2013100770596A CN201310077059A CN103163363A CN 103163363 A CN103163363 A CN 103163363A CN 2013100770596 A CN2013100770596 A CN 2013100770596A CN 201310077059 A CN201310077059 A CN 201310077059A CN 103163363 A CN103163363 A CN 103163363A
- Authority
- CN
- China
- Prior art keywords
- voltage
- phase
- line voltage
- power grid
- positive sequence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a power grid voltage dropping testing algorithm for dynamic voltage restorer. The algorithm tests fundamental positive sequence and negative sequence component of the power grid voltage through a recursive sliding window discrete Fourier transformation to calculate practical offset of power grid voltage, and compares with a preset threshold to further judge whether the power grid voltage drops or not. The testing algorithm is fast and has a stronger resistivity to power grid voltage harmonic waves. According to the testing results, the testing algorithm can quickly test symmetrical power grid voltage drop and asymmetric power grid voltage drop, and is not easy to be influenced by harmonic waves.
Description
[technical field]
The present invention relates to the dynamic electric voltage recovery device research field, particularly the line voltage of dynamic electric voltage recovery device falls detection algorithm.
[background technology]
The impact that dynamic electric voltage recovery device (DVR) can effectively protect sensitive loads not fallen by line voltage is widely used in the protection of industry spot electric network fault.Off-line type DVR only puts into operation when line voltage falls generation, is in bypass condition when electrical network is normal, to reduce the loss of system.The input of DVR and cut out and fall detection algorithm by voltage and control.Therefore, it is one of important component part in the DVR control system that voltage falls detection algorithm, and it is directly determining the dynamic response performance of DVR.
In recent years, there is the scholar to propose to utilize dynamic electric voltage recovery device to realize the low voltage crossing of dual feedback wind power generation system, to satisfy the electrical network standard proposed requirement that is incorporated into the power networks.Usually wind generator system region of living in is comparatively remote, multiple access light current net, so the wind energy turbine set port voltage fluctuating range is larger under normal circumstances, and may have larger voltage harmonic.In employing DVR realizes the application of wind generator system low voltage crossing, the fluctuation of line voltage amplitude and voltage harmonic fall the test section to DVR control system especially line voltage and have proposed higher requirement, quick and precisely detect the generation of falling, and avoid the miscarrying of DVR to enter as far as possible.Find by searching document, pay close attention to control and the compensation method of DVR more in existing document, to realize the low voltage crossing of wind generator system, study less and the line voltage under this application scenario is fallen detection algorithm.
Existing line voltage falls the application scenario that detection algorithm is mainly used in the protection sensitive loads.According to the requirement of DVR control performance, voltage falls detection algorithm should satisfy rapidity, vulnerability to jamming, the requirement of accuracy and completeness four aspects.Many scholars are studied the detection that voltage falls, and have proposed corresponding detection algorithm.According to the number of phases, can be divided into based on single-phase detection algorithm with based on the detection algorithm of three-phase having detection method now.Based on single-phase detection algorithm, whether judge lower than 90% ratings whether voltage falls by the amplitude (perhaps effective value, peak value) that detects single-phase voltage.Different single-phase detection algorithms is different on the computing method of single-phase voltage amplitude, such as the effective value method, DFT analyzes, 2 or multipoint method, and constructing virtual voltage method, wherein best with constructing virtual voltage method response rapidity and vulnerability to jamming, but in the situation that voltage harmonic content is larger, have larger contradiction between rapidity and vulnerability to jamming.Based on the detection algorithm of three-phase, the detection criteria that distinct methods judgement voltage falls there are differences.Whether detection method based on the positive-sequence component amplitude only detects three-phase voltage positive-sequence component amplitude lower than 90% ratings, and the method is calculated positive-sequence component by low pass and notch filter, and response speed is limited but its vulnerability to jamming is better.Fall for asymmetrical voltage, there is the problem that detects the blind area in the method.Another method is the electric network voltage phase tracing, and its detection criteria is the degree that virtual voltage DQ component departs from its reference value.Whether the method is fallen to detect voltage greater than predefined threshold values by the effective value that judges instantaneous bias.This detection criteria has considered the impact of three-phase voltage positive sequence and negative sequence component, but the relation of it and positive sequence and negative sequence component is nonlinear.
Below provide the pertinent literature of retrieval:
[1]Chris Fitzer,Mike Barnes,and Peter Green,"Voltage sag detection technique for a dynamic voltage restorer,"IEEE Trans on Industry Applicat,vol.40,no.1,pp.203-212,Jan/Feb2004.
[2]Huang Xinming.＂Load voltage regulation by series and unified power quality controller＂,Ph.D.Dissertation,Xi’an Jiaotong University,2009.
[3]A.Teke K.Bayindir M.Tümay.Sag/swell detection method for fuzzy logic controlled dynamic voltage restorer.IET Gener.Transm.Distrib.,vol.4,iss.1,pp.1–12,2010.
[4]Po-Tai Cheng,Chian-Chung Huang,Chun-Chiang Pan et.al"Design and Implementation of a Series Voltage Sag Compensator Under Practical Utility Conditions,"IEEE Trans.Ind.Applicat.,vol.39,pp.844–853,May/June.2003.
[summary of the invention]
For the weak point that exists in above-mentioned existing method, the object of the invention is to propose a kind of line voltage that is applicable to dynamic electric voltage recovery device and fall detection algorithm.This detection algorithm detection of grid voltage rapidly and accurately falls, and Voltage Harmonic is had good resistivity on the basis that does not affect the detection response performance.
To achieve these goals, the present invention adopts following technical scheme:
The line voltage that is applicable to dynamic electric voltage recovery device falls detection algorithm, comprises the following steps:
Step 3, adopting moving window is the recursive discrete Fourier transformation method of 10ms, analyzes respectively
With
DC component amplitude and 2 frequency multiplication AC compounent amplitudes, by signal
Analysis can get fundamental positive sequence d axle component
With first-harmonic negative sequence component amplitude V
N1, by signal
Analysis can get fundamental positive sequence q axle component
With first-harmonic negative sequence component amplitude V
N2
Step 4 obtains the step 3 analysis
With
Calculate line voltage fundamental positive sequence amplitude V by formula (1)
P, by V
N1And V
N2Obtain line voltage first-harmonic negative sequence component amplitude V after algebraic mean
N
Step 5, the signal V that is calculated by step 4
PAnd V
N, by the offset Δ V of formula (2) calculating actual electric network voltage;
ΔV=V
P+2V
N （2）
Step 6 is compared with the threshold values of setting by the line voltage offset Δ V of reality, during greater than the threshold values set, judges that line voltage falls as Δ V, and the generation trigger pip also latchs soft phase-locked loop; During less than the threshold values set, line voltage falls or recovers as Δ V, and trigger pip is zero.
As the preferred embodiments of the present invention, in step 1, adopt bandwidth to follow the tracks of the phase theta of the fundamental positive sequence of three phase network voltage lower than the soft phase-locked loop of 50Hz.
As the preferred embodiments of the present invention, in step 2, by rotating coordinate transformation, the line voltage fundamental positive sequence becomes DC component, and the first-harmonic negative sequence component becomes 2 frequency multiplication AC compounent, and other time voltage harmonic becomes the AC compounent of high frequency.
The present invention has following beneficial effect: it is fundamental positive sequence and the negative sequence component amplitude of the recursive discrete Fourier transformation methods analyst three phase network voltage of 10ms that the present invention adopts moving window, on the basis that guarantees certain rapidity, simultaneously Voltage Harmonic had stronger resistivity; The present invention adopts the linear criterion in conjunction with fundamental positive sequence and negative sequence component, effectively detects any phase voltage and falls symmetry and asymmetrical voltage Amplitude drop lower than ratings 90%.Can see from simulation result, the present invention can detect fast and accurately all types of line voltages and fall, and disturbance has stronger resistivity to Voltage Harmonic.
[description of drawings]
Fig. 1 is the structured flowchart that in the present invention, line voltage falls detection algorithm;
Fig. 2 calculates the fundamental positive sequence of three phase network voltage and the result of negative sequence component for the recursive discrete Fourier transformation method that adopts the 10ms moving window; (a) figure is three phase network voltage, and it falls at 0.06s, continues to return to pre-fault status after 0.06s; (b) figure is the three-phase voltage of DQ rotating coordinate system, and DQ voltage exists direct current and AC compounent when asymmetrical voltage falls; (c) figure is fundamental positive sequence and the negative sequence component that adopts the three phase network voltage that the recursive discrete Fourier transformation method of 10ms moving window calculates.
Fig. 3 is testing process and the result of algorithm of the present invention when the line voltage symmetry is fallen; (a) figure is three phase network voltage, three-phase symmetric voltage occurs when 0.06s to be fallen, and lasting 0.06s; (b) figure is the detection criteria that adopts in this algorithm, the DQ voltage deviation amount that calculates; (c) figure is the trigger pip that produces.
Fig. 4 is algorithm of the present invention in testing process and the result that line voltage is asymmetric when falling; (a) figure is three phase network voltage, asymmetrical voltage occurs when 0.06s to be fallen, and lasting 0.06s; (b) figure is the detection criteria that adopts in this algorithm, the DQ voltage deviation amount that calculates; (c) figure is the trigger pip that produces.
Fig. 5 is testing process and the result of algorithm of the present invention when Voltage Harmonic content is larger; (a) figure is the three phase network voltage that contains harmonic wave, asymmetrical voltage occurs when 0.06s to be fallen, and lasting 0.06s; (b) figure is the detection criteria that adopts in this algorithm, the DQ voltage deviation amount that calculates, and same Fig. 4 (b) contrasts as can be known, and detection computations is no influence from harmonic as a result; (c) figure is the trigger pip that produces.
[embodiment]
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The line voltage that the present invention's proposition is applicable to dynamic electric voltage recovery device falls detection algorithm, and its structured flowchart comprises the following steps as shown in Figure 1:
Step 3, adopting moving window is the recursive discrete Fourier transformation method of 10ms, analyzes respectively
With
DC component amplitude and 2 frequency multiplication AC compounent amplitudes, by signal
Analysis can get fundamental positive sequence d axle component
With first-harmonic negative sequence component amplitude V
N1, by signal
Analysis can get fundamental positive sequence q axle component
With first-harmonic negative sequence component amplitude V
N2
Step 4 obtains the step 3 analysis
With
Calculate line voltage fundamental positive sequence amplitude V by formula (1)
P, by V
N1And V
N2Obtain line voltage first-harmonic negative sequence component amplitude V after algebraic mean
N
Step 5, the signal V that is calculated by step 4
PAnd V
N, by the offset Δ V of formula (2) calculating actual electric network voltage;
ΔV=V
P+2V
N （2）
Step 6 is compared with the threshold values of setting by the line voltage offset Δ V of reality, during greater than the threshold values set, judges that line voltage falls, generation trigger pip and locking soft phase-locked loop as Δ V; During less than the threshold values set, line voltage falls or recovers as Δ V, and trigger pip is zero.
In step 3 of the present invention, adopting moving window is fundamental positive sequence and the negative sequence component amplitude of the recursive discrete Fourier transformation method calculating three phase network voltage of 10ms, the dynamic process that calculates and result are as shown in Figure 2, this method has stronger opposing to suppress ability to disturbances such as Voltage Harmonic when guaranteeing rapidity.Take line voltage, asymmetric falling as example occuring, after voltage falls, under rotating coordinate system, comprises the AC compounent of 2 frequencys multiplication in its dq component of voltage.Adopt the moving window of 10ms, the dq component of voltage is carried out discrete Fourier transformation, calculate DC component amplitude and the 2 frequency multiplication AC compounent amplitudes of dq voltage signal, also can calculate other order harmonic components amplitude in necessary situation.In theory, maximum can obtain positive sequence and the negative sequence component amplitude of stable state through the time delay of 10ms.
In step 5, the present invention adopts the linear criterion in conjunction with fundamental positive sequence and negative phase-sequence amplitude, judges whether line voltage falls, and the line voltage below 90% falls fault to ratings effectively to detect any phase voltage Amplitude drop.
Figure 3 shows that testing process and the result of the present invention when symmetrical line voltage falls.When line voltage generation symmetry was fallen, the actual electric network voltage DQ offset Δ V that detection algorithm of the present invention calculates increased gradually, when setting threshold values, provided trigger pip as Δ V, and dynamic electric voltage recovery device puts into operation, and compensation network voltage falls.
Figure 4 shows that testing process and the result of the present invention when unbalanced network voltage falls.When asymmetric falling occurs in line voltage, testing process is similar, the actual electric network voltage DQ offset Δ V that detection algorithm of the present invention calculates increases gradually, and do not contain AC compounent, as Δ V when setting threshold values, provide trigger pip, dynamic electric voltage recovery device puts into operation, and compensation network voltage falls.
Figure 4 shows that testing process and the result of the present invention when Voltage Harmonic content is larger.Calculate fundamental positive sequence and the negative sequence component amplitude of line voltage due to the discrete Fourier transformation method that adopts recurrence in the present invention, voltage harmonic can be ignored the result of calculation impact of stable state, so algorithm of the present invention has stronger resistivity to voltage harmonic.As shown in the figure, when containing harmonic wave in line voltage, do not contain the wave components such as harmonic wave in the actual electric network voltage DQ offset Δ V that detection algorithm calculates, as Δ V when setting threshold values, provide trigger pip, dynamic electric voltage recovery device puts into operation, and compensation network voltage falls.
Provide a kind of line voltage that is applicable to dynamic electric voltage recovery device in the present invention and fallen detection algorithm, and under the Matlab/Simulink platform, this detection algorithm has been carried out simulating, verifying.Can see from the result of emulation, this control method detection of grid voltage is rapidly and accurately fallen.
Claims (3)
1. the line voltage that is applicable to dynamic electric voltage recovery device falls detection algorithm, comprises the following steps:
Step 1 by software phase-lock loop (PLL), detects in real time and follows the tracks of three phase network voltage signal V
abcThe fundamental positive sequence phase theta;
Step 2 is by rotating coordinate transformation, with three-phase voltage signal V
abcBe transformed under the dq rotating coordinate system by the abc rest frame, obtain the dq voltage signal
With
Step 3, adopting moving window is the recursive discrete Fourier transformation method (RDFT) of 10ms, analyzes respectively
With
DC component amplitude and 2 frequency multiplication AC compounent amplitudes, by signal
Analysis can get fundamental positive sequence d axle component
With first-harmonic negative sequence component amplitude V
N1, by signal
Analysis can get fundamental positive sequence q axle component
With first-harmonic negative sequence component amplitude V
N2
Step 4 obtains the step 3 analysis
With
Calculate line voltage fundamental positive sequence amplitude V by formula (1)
P, by V
N1And V
N2Obtain line voltage first-harmonic negative sequence component amplitude V after algebraic mean
N
Step 5, the signal V that is calculated by step 4
PAnd V
N, by the offset Δ V of formula (2) calculating actual electric network voltage;
ΔV=V
P+2V
N （2）
Step 6 is compared with the threshold values of setting by the line voltage offset Δ V of reality, during greater than the threshold values set, judges that line voltage falls as Δ V, and the generation trigger pip also latchs soft phase-locked loop; During less than the threshold values set, line voltage falls or recovers as Δ V, and trigger pip is zero.
2. the line voltage for dynamic electric voltage recovery device according to claim 1 falls detection algorithm, it is characterized in that: in step 1, adopt bandwidth to follow the tracks of the phase theta of the fundamental positive sequence of three phase network voltage lower than the soft phase-locked loop of 50Hz.
3. the line voltage for dynamic electric voltage recovery device according to claim 1 falls detection algorithm, it is characterized in that: in step 2, pass through rotating coordinate transformation, the line voltage fundamental positive sequence becomes DC component, the first-harmonic negative sequence component becomes 2 frequency multiplication AC compounent, and other time voltage harmonic becomes the AC compounent of high frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310077059.6A CN103163363B (en) | 2013-03-11 | 2013-03-11 | Power grid voltage dropping testing algorithm for dynamic voltage restorer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310077059.6A CN103163363B (en) | 2013-03-11 | 2013-03-11 | Power grid voltage dropping testing algorithm for dynamic voltage restorer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103163363A true CN103163363A (en) | 2013-06-19 |
| CN103163363B CN103163363B (en) | 2015-05-27 |
Family
ID=48586618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310077059.6A Expired - Fee Related CN103163363B (en) | 2013-03-11 | 2013-03-11 | Power grid voltage dropping testing algorithm for dynamic voltage restorer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103163363B (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414204A (en) * | 2013-07-05 | 2013-11-27 | 思源电气股份有限公司 | Control method for using dynamic voltage to compensate wind power generation system output reactive power |
| CN104615120A (en) * | 2013-11-05 | 2015-05-13 | 洛克威尔自动控制技术股份有限公司 | Industrial system phase sag detection |
| CN105116195A (en) * | 2015-07-13 | 2015-12-02 | 中国人民解放军海军工程大学 | Voltage drop detection method suitable for power grid voltage large harmonic content |
| CN105340161A (en) * | 2013-06-26 | 2016-02-17 | Posco能源公司 | Apparatus and method for controlling overcurrent of grid-connected inverter due to abnormal grid voltage |
| CN107356826A (en) * | 2017-01-10 | 2017-11-17 | 深圳点亮新能源技术有限公司 | A kind of voltage dip detects algorithm |
| CN107765074A (en) * | 2017-09-25 | 2018-03-06 | 宁波中车时代传感技术有限公司 | The detection method and detecting system of traction convertor harmonic current signal intensity |
| CN108020708A (en) * | 2017-09-04 | 2018-05-11 | 国网江苏省电力公司扬州供电公司 | A kind of offset voltage detection method of dynamic electric voltage recovery device |
| CN110045175A (en) * | 2019-01-29 | 2019-07-23 | 广东电网有限责任公司 | A kind of single phase distribution system voltage falls detection method |
| CN110672974A (en) * | 2019-09-27 | 2020-01-10 | 长沙理工大学 | Novel power distribution network voltage drop detection method |
| CN110749769A (en) * | 2019-11-20 | 2020-02-04 | 山东泰开自动化有限公司 | Rapid detection method for three-phase voltage drop |
| CN111030438A (en) * | 2019-12-31 | 2020-04-17 | 上海新时达电气股份有限公司 | Anti-network disturbance method and device for four-quadrant frequency converter |
| CN111509726A (en) * | 2020-05-21 | 2020-08-07 | 江苏莱提电气股份有限公司 | Phase-locked loop control method and system based on dynamic voltage restorer |
| CN112611929A (en) * | 2020-11-30 | 2021-04-06 | 科华恒盛股份有限公司 | Anomaly detection method applied to three-phase alternating current and related device |
| CN112881788A (en) * | 2021-02-24 | 2021-06-01 | 深圳市中电软件有限公司 | Motor restarting method and system based on electric dazzling rapid identification method |
| CN113991835A (en) * | 2021-11-29 | 2022-01-28 | 国网江苏省电力有限公司扬州市江都区供电分公司 | Control method for seamless switching of double power supplies based on spare power automatic switching device |
| CN114325070A (en) * | 2021-12-13 | 2022-04-12 | 广西电网有限责任公司电力科学研究院 | High-robustness voltage sag detection method and system under extreme power grid working condition |
| CN114784747A (en) * | 2022-06-17 | 2022-07-22 | 成都特隆美储能技术有限公司 | Method for simulating asymmetric voltage drop in energy storage converter test |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19812813A1 (en) * | 1998-03-17 | 1999-09-30 | Siemens Ag | Rail currents measurement method for rail track |
| CN101793918A (en) * | 2009-11-18 | 2010-08-04 | 中电普瑞科技有限公司 | Voltage sag detection method |
| CN102394500A (en) * | 2011-12-14 | 2012-03-28 | 重庆市江津区供电有限责任公司 | Control method for improving dynamic voltage restorer harmonic inhibition capability |
| CN102508008A (en) * | 2011-10-25 | 2012-06-20 | 甘肃电力科学研究院 | System and method for detecting amplitude-phase of voltage dip of grid-connected bus of wind power generation system |
-
2013
- 2013-03-11 CN CN201310077059.6A patent/CN103163363B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19812813A1 (en) * | 1998-03-17 | 1999-09-30 | Siemens Ag | Rail currents measurement method for rail track |
| CN101793918A (en) * | 2009-11-18 | 2010-08-04 | 中电普瑞科技有限公司 | Voltage sag detection method |
| CN102508008A (en) * | 2011-10-25 | 2012-06-20 | 甘肃电力科学研究院 | System and method for detecting amplitude-phase of voltage dip of grid-connected bus of wind power generation system |
| CN102394500A (en) * | 2011-12-14 | 2012-03-28 | 重庆市江津区供电有限责任公司 | Control method for improving dynamic voltage restorer harmonic inhibition capability |
Non-Patent Citations (2)
| Title |
|---|
| A.TEKE ET AL.: "Fast sag/swell detection method for fuzzy logic controlled dynamic voltage restorer", 《IET GENERATION,TRANSMISSION&DISTRIBUTION》 * |
| 周晖: "动态电压恢复器检测方法和补偿策略综述", 《电网技术》 * |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105340161A (en) * | 2013-06-26 | 2016-02-17 | Posco能源公司 | Apparatus and method for controlling overcurrent of grid-connected inverter due to abnormal grid voltage |
| EP3016257A4 (en) * | 2013-06-26 | 2017-05-10 | Posco Energy Co. Ltd. | Apparatus and method for controlling overcurrent of grid-connected inverter due to abnormal grid voltage |
| US9712043B2 (en) | 2013-06-26 | 2017-07-18 | Posco Energy Co., Ltd. | Apparatus and method for controlling overcurrent of grid-connected inverter due to abnormal grid voltage |
| CN105340161B (en) * | 2013-06-26 | 2018-01-02 | Posco能源公司 | Apparatus and method for controlling the overcurrent of combining inverter caused by abnormal line voltage |
| CN103414204A (en) * | 2013-07-05 | 2013-11-27 | 思源电气股份有限公司 | Control method for using dynamic voltage to compensate wind power generation system output reactive power |
| CN103414204B (en) * | 2013-07-05 | 2015-08-19 | 思源电气股份有限公司 | Adopt the control method of dynamic voltage compensation wind generator system output reactive power |
| CN104615120A (en) * | 2013-11-05 | 2015-05-13 | 洛克威尔自动控制技术股份有限公司 | Industrial system phase sag detection |
| CN105116195A (en) * | 2015-07-13 | 2015-12-02 | 中国人民解放军海军工程大学 | Voltage drop detection method suitable for power grid voltage large harmonic content |
| CN105116195B (en) * | 2015-07-13 | 2018-07-06 | 中国人民解放军海军工程大学 | Suitable for the big method for detecting voltage drop of Voltage Harmonic content |
| CN107356826A (en) * | 2017-01-10 | 2017-11-17 | 深圳点亮新能源技术有限公司 | A kind of voltage dip detects algorithm |
| CN108020708A (en) * | 2017-09-04 | 2018-05-11 | 国网江苏省电力公司扬州供电公司 | A kind of offset voltage detection method of dynamic electric voltage recovery device |
| CN107765074A (en) * | 2017-09-25 | 2018-03-06 | 宁波中车时代传感技术有限公司 | The detection method and detecting system of traction convertor harmonic current signal intensity |
| CN110045175A (en) * | 2019-01-29 | 2019-07-23 | 广东电网有限责任公司 | A kind of single phase distribution system voltage falls detection method |
| CN110672974A (en) * | 2019-09-27 | 2020-01-10 | 长沙理工大学 | Novel power distribution network voltage drop detection method |
| CN110749769A (en) * | 2019-11-20 | 2020-02-04 | 山东泰开自动化有限公司 | Rapid detection method for three-phase voltage drop |
| CN111030438B (en) * | 2019-12-31 | 2022-06-28 | 上海新时达电气股份有限公司 | Method and device for resisting network disturbance of four-quadrant frequency converter |
| CN111030438A (en) * | 2019-12-31 | 2020-04-17 | 上海新时达电气股份有限公司 | Anti-network disturbance method and device for four-quadrant frequency converter |
| CN111509726A (en) * | 2020-05-21 | 2020-08-07 | 江苏莱提电气股份有限公司 | Phase-locked loop control method and system based on dynamic voltage restorer |
| CN111509726B (en) * | 2020-05-21 | 2021-11-05 | 江苏莱提电气股份有限公司 | Phase-locked loop control method and system based on dynamic voltage restorer |
| CN112611929A (en) * | 2020-11-30 | 2021-04-06 | 科华恒盛股份有限公司 | Anomaly detection method applied to three-phase alternating current and related device |
| CN112611929B (en) * | 2020-11-30 | 2024-02-06 | 科华恒盛股份有限公司 | Abnormality detection method and related device applied to three-phase alternating current |
| CN112881788A (en) * | 2021-02-24 | 2021-06-01 | 深圳市中电软件有限公司 | Motor restarting method and system based on electric dazzling rapid identification method |
| CN112881788B (en) * | 2021-02-24 | 2022-08-02 | 深圳市中电软件有限公司 | Motor restarting method and system based on electric dazzling rapid identification method |
| CN113991835A (en) * | 2021-11-29 | 2022-01-28 | 国网江苏省电力有限公司扬州市江都区供电分公司 | Control method for seamless switching of double power supplies based on spare power automatic switching device |
| CN114325070A (en) * | 2021-12-13 | 2022-04-12 | 广西电网有限责任公司电力科学研究院 | High-robustness voltage sag detection method and system under extreme power grid working condition |
| CN114325070B (en) * | 2021-12-13 | 2023-09-05 | 广西电网有限责任公司电力科学研究院 | High-robustness voltage sag detection method and system under extreme power grid working condition |
| CN114784747A (en) * | 2022-06-17 | 2022-07-22 | 成都特隆美储能技术有限公司 | Method for simulating asymmetric voltage drop in energy storage converter test |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103163363B (en) | 2015-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103163363B (en) | Power grid voltage dropping testing algorithm for dynamic voltage restorer | |
| US9742192B2 (en) | Method and system for island detection and anti-islanding protection in distributed power generation systems | |
| US10965123B1 (en) | Photovoltaic direct current distribution system having a fault detection and location-based active protection system | |
| US9450411B2 (en) | Method, apparatus and system for suppressing low frequency oscillation in power system | |
| CN101793918B (en) | Voltage sag detection method | |
| CN104135003B (en) | APF control method based on active disturbance rejection and repetitive control | |
| Hoke et al. | A power hardware-in-the-loop framework for advanced grid-interactive inverter testing | |
| Yin et al. | Islanding detection using proportional power spectral density | |
| CN101877587A (en) | Novel soft phase-locked loop | |
| Sun et al. | A two-stage simultaneous control scheme for the transient angle stability of VSG considering current limitation and voltage support | |
| CN104535820A (en) | Three-phase active power filter harmonic current detection method based on FBD method | |
| CN105425011A (en) | Non-linear amplitude phase detection method suitable for single-phase distortion power grid | |
| CN104535890A (en) | Rapid network voltage drop detection method | |
| Adly et al. | An optimal/adaptive reclosing technique for transient stability enhancement under single pole tripping | |
| CN108627731A (en) | A kind of rapid detection method of single-phase power-off | |
| Karimi-Ghartemani et al. | Extraction of signals for harmonics, reactive current and network-unbalance compensation | |
| CN109765420A (en) | Rapid detection method temporarily drops in a kind of single-phase voltage converted based on Morphologic filters and method of derivation α β-dq | |
| CN108964066A (en) | The Voltage Drop and harmonic wave synchroballistic method of DVR system | |
| CN201830237U (en) | Soft phase locking ring based on wave filter | |
| Venkatasubramanian et al. | Overview of wide-area stability monitoring algorithms in power systems using synchrophasors | |
| Mohiti et al. | A hybrid micro grid islanding detection method | |
| Beikbabaei et al. | Mitigating false data injection attacks on inverter set points in a 100% inverter-based microgrid | |
| CN104135008A (en) | Method for comprehensive evaluation of quiescent voltage stability and power angle stability by using resistance margin | |
| Yu et al. | Islanding detection method based on S transform and ANFIS | |
| Seyedi et al. | Impact of fault impedance and duration on transient response of hybrid AC/DC microgrid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150527 Termination date: 20180311 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |