CN101257209B - Islet operation detecting method of photovoltaic parallel network generating system - Google Patents
Islet operation detecting method of photovoltaic parallel network generating system Download PDFInfo
- Publication number
- CN101257209B CN101257209B CN2008100651717A CN200810065171A CN101257209B CN 101257209 B CN101257209 B CN 101257209B CN 2008100651717 A CN2008100651717 A CN 2008100651717A CN 200810065171 A CN200810065171 A CN 200810065171A CN 101257209 B CN101257209 B CN 101257209B
- Authority
- CN
- China
- Prior art keywords
- frequency
- grid
- voltage
- site
- feedback
- 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.)
- Expired - Fee Related
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides an isolated island operation detection method of photovoltaic grid-connected generation system which includes: a control device detects voltage frequency of grid-connected point, judges voltage frequency of grid-connected point whether reaching frequency protection threshold, if yes, a start anti-isolated island protection signal is outputted; if not, frequency signal of grid-connected current instruction is calculated by using double positive feedback active frequency deflection method, and the frequency signal is outputted; the double positive feedback active frequency deflection method is that obtained grid-connected point voltage frequency deflection relative to average frequency is used as first positive feedback, and change trend of frequency deflection is used as second positive feedback, feedback magnification factor of first positive feedback is adjusted. The method realizes isolated island detection rapidly, simulation and experimental result, isolated island detection time is shorten in 0.10s, 0.13s, grid-connected current harmonic distortion THD are 2.06%, 2.97% respectively, and has advantage over traditional method in isolated island detection speed and reducing interference to power network.
Description
Technical field
The invention belongs to photovoltaic generation and parallel network power generation technical field, specifically is a kind of islet operation detecting method of grid-connected photovoltaic system.
Background technology
The energy has become the common significant problem of paying close attention to of international community, and new forms of energy such as solar energy are because characteristics such as its renewable and cleaning more and more come into one's own, and parallel network power generation is a kind of important form of utilizing solar energy on a large scale.The direct current that grid-connected photovoltaic system (being designated hereinafter simply as the PV system) sends solar cell by combining inverter converts the good alternating current of waveform to, directly to mains supply, energy storage device that need be such as storage battery, the construction and the maintenance cost of system is low, conversion efficiency and reliability height.
Along with the continuous increase of PV system, also more and more higher to its requirement of safeguard measure of tackling various unusual conditions, need wherein to consider that a kind of special abnormal running situation is the islet operation phenomenon.After the islet operation phenomenon is meant that the PV system disconnects with big electrical network on electric, still continue as the situation of the regional area load power supply that is attached thereto this moment.In grid-connected photovoltaic system shown in Figure 1, when switch S was closed, system was incorporated into the power networks; When switch S disconnects, system's islet operation.If can not in time it be detected and stop the operation of this PV system behind the generation isolated island, may cause following harm:
Threaten the maintenance personnel's of supply line safety.
Cause electric network protection circuit cisco unity malfunction, influence the reclosing of electrical network.
When supply line recovers,, cause circulation and damage relevant electric installation because voltage magnitude and phase place that the PV system produces in load are inconsistent with electrical network probably.
Single-phase PV system continues power supply, thereby causes threephase load phase shortage power supply in the electrical network.
Therefore, require the PV system can detect in time whether the islet operation phenomenon takes place, and when taking place, isolated island stops power supply, the controller product that generates electricity by way of merging two or more grid systems that the grid company and the standard that is incorporated into the power networks all require to be correlated with has the function of preventing isolated island, and IEEE Std.929-2000 has proposed the test process of a standard.
The emphasis of anti-islet operation and difficult point are the detection to isolated island, can compare in the performance of the following aspects to island detection method:
1. the stability when being incorporated into the power networks does not have misoperation;
2. detection speed, standard-required detect isolated island and close grid-connected system in after isolated island takes place 2 seconds;
3. software and hardware cost;
4. to the applicability of many PV in parallel systems;
5. to the interference of system, reduce the percent harmonic distortion (THD) of grid-connected current as far as possible.
The island detection technology often can be divided into passive type and active two classes.The passive type detection technique generally is the monitoring electric network state, as voltage, frequency, as judging the whether foundation of fault of electrical network.Passive type detection method commonly used has overvoltage, under voltage, overfrequency and under-frequency, in case also voltage, the frequency of site exceed normal range (NR), judges that electrical network breaks down, and protective circuit will stop the operation of PV system.The advantage that passive type detects is not need external disturbance, therefore can not influence the quality of power supply.But its shortcoming is that electrical network cuts off the back system voltage and significant change does not appear in frequency, can't detect the islet operation phenomenon when the power output of controller and bearing power maintenance balance.
The active detecting rule is regularly to inject interference signal to electrical network by combining inverter, and detection system is subjected to the response after the disturbance, judges whether electrical network is cut off.Active detecting method commonly used has electric network impedance detection method and intentional frequency offset method (Active Frequency Drift:AFD).
The electric network impedance detection method detects corresponding voltage response and calculates electric network impedance by inject disturbance in grid-connected current, when electric network impedance is undergone mutation, judges the islet operation phenomenon to occur.Its shortcoming is reliable inadequately in many PV in parallel systems, because the output disturbance of each PV system is difficult to synchronously.
The AFD method realizes by Control Software, its grid-connected current instruction i
* GridFrequency f
iWith formula f
i(i)=f
PCC(i-1) ± Δ f
0Determine, detect the point voltage v that is incorporated into the power networks that obtains in real time
PCCFrequency f
PCCConstant offset f of last adding
0, as grid-connected current instruction i
* GridFrequency f
i, form disturbance to system frequency.
With reference to Fig. 2, when normally being incorporated into the power networks, v
PCCBy line voltage clamper, f
PCCEqual mains frequency, can not accumulate skew; Under the situation that isolated island takes place, v
PCCDo not had the support of line voltage, its frequency can be subjected to the influence of grid-connected current, thus the frequency disturbance Δ f of output current
0Effect can build up f over time
PCCCan reach the threshold value of frequency protection, can the judgement system islet operation phenomenon occur.The advantage of the method is the detection of many PV in parallel systems effective, and shortcoming is to introduce bigger harmonic wave to grid-connected current.Simulation result shows that under the prerequisite that guarantees by the IEEE929 test, the AFD method can make the THD of grid-connected current increase about 3%.
In order to solve the problem big that the AFD method exists to system disturbance, scholars have proposed intentional frequency offset positive feedback method (Active Frequency Drift with Positive Feedback:AFDPF), change frequency offset by positive feedback, quicken the skew of grid-connected current frequency.The frequency shift (FS) quantity algorithm of linear AFDPF method is as shown in the formula Δ f (i)=Δ f
0+ k * [f
PCC(i-1)-f
Grid0], its flow chart is seen Fig. 3.
Wherein, i represents i control cycle, and k is feedback amplification coefficient, f
Grid0Be mains frequency.The algorithm of linear AFDPF method is fairly simple, and the increment of THD is about 0.5% (simulation results).But because mains frequency constant always not is made as f with it
Grid0Can bring extra interference.In addition, the two-way skew of frequency, the detection effect in many PV in parallel systems remains further checking.
The frequency shift (FS) quantity algorithm of square AFDPF method as shown in the formula:
Δf(i)＝Δf
0+k×[f
PCC(i-1)-f
grid0]
2
Its flow chart is seen Fig. 4, because the unidirectional skew of frequency, can be applicable to many PV in parallel systems, and the increment that simulation result is introduced THD is about 0.4%.
Summary of the invention
Above-mentioned shortcoming in view of islet operation state inspection existence in the existing grid-connected photovoltaic system, the invention provides a kind of islet operation detecting method of grid-connected photovoltaic system, adopt dual positive feedback mode further to quicken the migration velocity of the frequency of grid-connected current, the fast detecting of islet operation state in the realization system reduces the interference to electrical network.
The islet operation detecting method of grid-connected photovoltaic system of the present invention is to realize like this.It may further comprise the steps:
Control device detects the also frequency of the voltage of site in real time, judges also whether the frequency of the voltage of site reaches the threshold value of frequency protection, if reach, and the anti-isolated island guard signal of output startup;
If also the frequency of the voltage of site does not reach the threshold value of frequency protection, calculate the frequency signal of grid-connected current instruction by dual positive feedback intentional frequency offset method, and export this frequency signal; Described dual positive feedback intentional frequency offset method is, with the frequency of voltage that obtain and the site with respect to the skew of average frequency as first positive feedback, and with the variation tendency of frequency shift (FS) as second positive feedback, regulate the feedback amplification coefficient of first positive feedback, when frequency shift (FS) reduces, make that this feedback amplification coefficient is one to set constant, when frequency shift (FS) increases, this feedback amplification coefficient is increased, with the migration velocity of further acceleration grid-connected current frequency.
In real system, the present invention can select inverse-T cycle time (T=1/f) with frequency f as regulated variable, when and during the voltage zero-cross of site, control device calculates the period T (i-1) of the point voltage that is incorporated into the power networks, and whether the frequency of the voltage of judgement and site reaches the threshold value of frequency protection, if reach, output starts anti-isolated island guard signal;
If also the frequency of the voltage of site does not reach the threshold value of frequency protection, press following formula and 1. determine grid-connected current instruction i
* GridAt the T cycle time in i cycle
i(i), and export the frequency signal of corresponding grid-connected current instruction,
T
i(i)＝T(i-1)+[K(i)]
m|T(i-1)-
(i)|
n.....................①
Wherein, T (i-1) expression is by DPLL or zero passage detection voltage V that obtain and the site
PCCIn the cycle time in i-1 cycle, K (i) is the feedback amplification coefficient,
(i) be illustrated in time average period in N cycle before i cycle;
Exponent m=1～3, index n=1～3,
Average period
(i) 2. calculate by following formula,
3. frequency shift (FS) trend variable dT calculates by following formula,
dT＝|T(i-1)-T(i)|-|
(i-2)-
(i-1)|..................③
Feedback amplification coefficient K (i) according to formula 3. frequency shift (FS) trend variable dT select, when dT≤0, make K (i)=K
0, when dT＞0, the expression frequency shift (FS) increases, and increases the feedback amplification coefficient, makes K (i)=K (i-1)+K
0, further accelerate frequency shift (FS) speed.
According to formula 1., i
* GridThe deviation of cycle time be Δ T (i)=[K (i)]
m| T (i-1)-
(i) |
n, at the state that normally is incorporated into the power networks, K (i) and | T (i-1)-
(i) | all very little, so little to the influence of the quality of power supply.In case the islet operation phenomenon takes place, and the both can increase by positive feedback, Ti increases to the underfrequency protection threshold value rapidly, closes down the PV system.
Above-mentioned exponent m, n value are chosen according to the frequency stability of electrical network, if mains frequency is very stable, less than positive and negative 0.1Hz, n can be greater than m as the mains frequency deviation; If the mains frequency deviation is more than or equal to positive and negative 0.1Hz, n can be less than m.
The setting constant K of above-mentioned feedback amplification coefficient K (i)
oBe 0.1～1, the initial value of feedback amplification coefficient K (i) is K
o
The present invention adopts dual positive feedback intentional frequency offset method (Active Frequency Drift withDouble Positive Feedback:AFDDPF) to detect the islet operation state in the grid-connected photovoltaic system, its will and the frequency of the voltage of site with respect to the skew of average frequency as first positive feedback, regulate the frequency of grid-connected current; And with the variation tendency of frequency shift (FS) as second positive feedback, regulate the amplification coefficient of first positive feedback, further quicken the migration velocity of grid-connected current frequency, realize the fast detecting of islet operation.
Emulation and experimental result, the island detection time shortens, and is respectively 0.10s, 0.13s detection time, the percent harmonic distortion THD of grid-connected current is respectively 2.06%, 2.97%, no matter the present invention is in island detection speed, still reducing aspect the interference of electrical network, all obviously is better than conventional method.
Description of drawings
Fig. 1 is the basic block diagram of grid-connected photovoltaic system;
Fig. 2 is traditional intentional frequency offset method flow chart;
Fig. 3 is traditional linear positive feedback intentional frequency offset method flow chart;
Fig. 4 is traditional square positive feedback intentional frequency offset method flow chart;
Fig. 5 is the flow chart of islet operation detecting method of the present invention;
Fig. 6 realizes an embodiment system configuration schematic diagram of islet operation detecting method of the present invention;
Fig. 7 a-d is the simulation waveform of point voltage, grid-connected current and the point voltage frequency that is incorporated into the power networks of being incorporated into the power networks after isolated island takes place;
Fig. 8 a-d is the experimental waveform of point voltage, grid-connected current and the point voltage frequency that is incorporated into the power networks of being incorporated into the power networks after isolated island takes place.
Embodiment
Further specify of the present invention below in conjunction with accompanying drawing.
Method of the present invention is applicable to digital parallel network reverse control system, and the be incorporated into the power networks voltage zero-cross detection hardware circuit etc. of port of inverter adds that corresponding software programs can easily realize.Its core technology is to adopt dual positive feedback intentional frequency offset mode (AFDDPF) to realize the fast detecting of islet operation state.
Fig. 6 is for realizing an embodiment system configuration schematic diagram of the inventive method.System adopts the combining inverter of conventional single-stage+Industrial Frequency Transformer structure, and control device adopts the HD64F7047 chip, and the HD64F7047 chip is born all tasks, comprises island detection, grid-connected current instruction generation, output current wave modulation or the like.For the repeatability that guarantees to test, replace solar cell V with D.C. regulated power supply
Dc
System's major parameter is as follows:
Rated power: P
Rated=1.5kW
DC bus-bar voltage: V
Dc=240V
Reactor is incorporated into the power networks: L
Grid=6mH
Transformer voltage ratio: N=1: 2
Switching frequency: f=15kHz
Line voltage: V
Grid=220V
Rms
Mains frequency: f
Grid=50Hz
Feedback constant: K
0=0.5
Index: m=1, n=2
The requirement of IEEE Std.929-2000 is satisfied in the regional area load.Be parallel to the resonance frequency and the mains frequency f of the inductance L and the capacitor C of transformer secondary output
Grid(50Hz) conform to, L is 48.9mH, and C is 207F.Active power is determined that by resistance R R gets 40 Ω.The ratio 2.5 of reactive power and active power.The upper and lower threshold value of frequency protection is respectively 50.5Hz and 49.5Hz.
Its voltage detecting circuit to and the site alternating voltage sample; Zero cross detection circuit detects the zero crossing of the output signal of voltage detecting circuit, generates corresponding synchronizing signal;
The island detection program is calculated the frequency of the point voltage that is incorporated into the power networks according to this synchronizing signal, judges whether to take place the isolated island phenomenon, if close and drive output; Otherwise, calculate the frequency of grid-connected current instruction;
The grid-connected current instruction generation is determined the instantaneous value of grid-connected current instruction according to the frequency of above-mentioned synchronizing signal and grid-connected current instruction;
Current detection circuit is sampled to actual grid-connected current; Dc voltage circuit is sampled to DC bus-bar voltage; Grid-connected current Waveform Control program is determined pwm signal according to grid-connected current deviation, direct voltage instantaneous value and alternating voltage instantaneous value, obtains the sinusoidal waveform of and instruction unanimity; Drive circuit is isolated pwm signal and is amplified, and drives IGBT, injects disturbing signal in grid-connected current.
Above-mentioned grid-connected current instruction generation, grid-connected current Waveform Control etc. can adopt usual manner to realize, and the islet operation status detection has adopted the dual positive feedback intentional frequency offset of the present invention mode.
With reference to flow chart 5, the HD64F7047 chip at first moves the point voltage zero passage determining program that is incorporated into the power networks, when and the voltage v of site
PCCDuring zero passage, calculate the period T (i-1) of the point voltage that is incorporated into the power networks, and judge the also electric voltage frequency f of site
PCCReach the threshold value of frequency protection? if reach, output starts anti-isolated island guard signal;
Otherwise, by formula
Calculate average period
(i),
By formula dT=|T (i-1)-
(i) |-| T (i-2)-
(i-1) | computing cycle movement tendency dT;
According to the variation tendency of dT value determination frequency skew, when dT≤0, then make K (i)=K
0, when dT＞0 frequency shift (FS) increases, increase the feedback amplification coefficient, make K (i)=K (i-1)+K
0, further accelerate frequency shift (FS) speed;
And then, by formula T
i(i)=T (i-1)+[K (i)]
m| T (i-1)-
(i) |
nDetermine grid-connected current instruction i
* GridCycle, and export the frequency signal of corresponding grid-connected current instruction.
Wherein, exponent m=1, index n=2 sets constant K
oGet 0.5.
By Computer Simulation and experiment, with reference to Fig. 7-8, the system responses characteristic of relatively not having anti-isolated island function and employing linear AFDPF method, square AFDPF method and AFDDPF method of the present invention, Fig. 7 a-d is the simulation waveform of point voltage, grid-connected current and the point voltage frequency that is incorporated into the power networks of being incorporated into the power networks after isolated island takes place, Fig. 8 a-d is the experimental waveform of point voltage, grid-connected current and the point voltage frequency that is incorporated into the power networks of being incorporated into the power networks after isolated island takes place, and emulation and experimental result are seen performance comparing data table 1.
Performance comparing data shown in the table 1 shows no matter the present invention is in island detection speed, still reducing aspect the interference of electrical network, all obviously is better than other method.
Table 1
Claims (4)
1. the islet operation detecting method of a grid-connected photovoltaic system is characterized in that may further comprise the steps:
Control device detects the also frequency of the voltage of site in real time, judges also whether the frequency of the voltage of site reaches the threshold value of frequency protection, if reach, and the anti-isolated island guard signal of output startup;
If also the frequency of the voltage of site does not reach the threshold value of frequency protection, calculate the frequency signal of grid-connected current instruction by dual positive feedback intentional frequency offset method, and export this frequency signal; Described dual positive feedback intentional frequency offset method is, with the frequency of voltage that obtain and the site with respect to the skew of average frequency as first positive feedback, and with the variation tendency of frequency shift (FS) as second positive feedback, regulate the feedback amplification coefficient of first positive feedback, when frequency shift (FS) reduces, make that this feedback amplification coefficient is one to set constant, when frequency shift (FS) increases, this feedback amplification coefficient is increased, with the migration velocity of further acceleration grid-connected current frequency.
2. according to the islet operation detecting method of the grid-connected photovoltaic system of claim 1, it is characterized in that:
This detection method with time one-period reciprocal of frequency as regulated variable, when and during the voltage zero-cross of site, control device calculates the also period T (i-1) of the voltage of site, and whether the frequency of the voltage of judgement and site reaches the threshold value of frequency protection, if reach, output starts anti-isolated island guard signal;
If also the frequency of the voltage of site does not reach the threshold value of frequency protection, by formula T
i(i)=T (i-1)+[K (i)]
m| T (i-1)-
(i) |
nCalculate grid-connected current instruction i
* GridAt the T cycle time in i cycle
iAnd export the frequency signal of corresponding grid-connected current instruction (i);
Wherein, T (i-1) expression voltage V that record and the site
PCCIn the cycle time in i-1 cycle, K (i) is the feedback amplification coefficient,
(i) be illustrated in time average period in N cycle before i cycle;
Exponent m=1～3, index n=1～3,
Average period
(i) by formula
Calculate,
Frequency shift (FS) trend variable dT by formula dT=|T (i-1)-
(i) |-| T (i-2)-
(i-1) | calculate,
Feedback amplification coefficient K (i) selects according to frequency shift (FS) trend variable dT, when dT≤0, makes K (i)=K
0, when dT＞0, the expression frequency shift (FS) increases, and increases the feedback amplification coefficient, makes K (i)=K (i-1)+K
0, further accelerate frequency shift (FS) speed, wherein K
0Setting constant for feedback amplification coefficient K (i).
3. according to the islet operation detecting method of the grid-connected photovoltaic system of claim 2, it is characterized in that: described exponent m, n value are chosen according to the frequency stability of electrical network, if the mains frequency deviation is less than positive and negative 0.1Hz, n＞m; If the mains frequency deviation is more than or equal to positive and negative 0.1Hz, n＜m.
4. according to the islet operation detecting method of the grid-connected photovoltaic system of claim 2 or 3, it is characterized in that: the setting constant K of described feedback amplification coefficient K (i)
oBe 0.1～1, the initial value of feedback amplification coefficient K (i) is K
o
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100651717A CN101257209B (en) | 2008-01-10 | 2008-01-10 | Islet operation detecting method of photovoltaic parallel network generating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100651717A CN101257209B (en) | 2008-01-10 | 2008-01-10 | Islet operation detecting method of photovoltaic parallel network generating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101257209A CN101257209A (en) | 2008-09-03 |
| CN101257209B true CN101257209B (en) | 2010-06-16 |
Family
ID=39891756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100651717A Expired - Fee Related CN101257209B (en) | 2008-01-10 | 2008-01-10 | Islet operation detecting method of photovoltaic parallel network generating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101257209B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9520819B2 (en) | 2014-02-28 | 2016-12-13 | General Electric Company | System and method for controlling a power generation system based on a detected islanding event |
Families Citing this family (42)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488664B (en) * | 2009-02-27 | 2011-06-15 | 上海航锐电源科技有限公司 | Anti-island effect protection method based on output current frequency disturbance |
| CN101867171A (en) * | 2010-06-28 | 2010-10-20 | 中国南方电网有限责任公司电网技术研究中心 | Distributed generator islanding detection method based on impedance measurement |
| CN101944746B (en) * | 2010-07-20 | 2013-06-05 | 深圳市红岩电控设备有限公司 | Island detection method, device and system of photovoltaic grid-connected power generating system |
| CN102420435A (en) * | 2010-09-26 | 2012-04-18 | 武汉理工大学 | Adaptive island detection method for grid-connected photovoltaic power generation system |
| CN102005777B (en) * | 2010-11-04 | 2013-03-06 | 艾默生网络能源有限公司 | Control method and control system for photovoltaic grid-connected inverter |
| CN102183733B (en) * | 2011-03-07 | 2013-06-05 | 河海大学 | Photovoltaic grid connected inverter island detection method for improving quality of electric energy |
| CN102222934B (en) * | 2011-06-13 | 2013-09-25 | 深圳和而泰智能控制股份有限公司 | Isolated island detecting method, device and system for photovoltaic grid-connected power generation system |
| CN102522770B (en) * | 2011-12-04 | 2014-05-28 | 东华大学 | Transformer-less photovoltaic grid connection detection system and detection method |
| CN102611183B (en) * | 2012-03-01 | 2015-01-14 | 珠海天兆新能源技术有限公司 | Method for detecting and protecting isolated island of grid-connected power generation system |
| CN102593833B (en) * | 2012-03-19 | 2014-04-09 | 上海电力学院 | Method for designing frequency controller of independent micro-grid |
| CN103326350B (en) * | 2012-03-23 | 2016-03-16 | 通用电气公司 | Inverter controller, energy conversion system, photovoltaic energy conversion system and method |
| CN104584360A (en) * | 2012-08-30 | 2015-04-29 | 通用电气公司 | System and method for detecting islanding of electrical machines and protecting same |
| EP2720338B1 (en) * | 2012-10-10 | 2021-06-09 | FIMER S.p.A. | Method and arrangement for detecting an islanding operation of a distributed power generator |
| CN103048558B (en) * | 2012-11-05 | 2015-09-09 | 深圳航天科技创新研究院 | A kind of detection method and system mixing active isolated island effect prevention |
| CN103091604B (en) * | 2013-01-29 | 2015-10-28 | 深圳市京泉华科技股份有限公司 | A kind of island detection method of grid-connected photovoltaic system and pick-up unit |
| CN103207335B (en) * | 2013-03-21 | 2015-06-03 | 中国农业大学 | Island detection method based on phase-frequency positive feedback |
| CN103323704A (en) * | 2013-05-30 | 2013-09-25 | 东南大学 | Island detection method based on active current - voltage unbalance degree positive feedback |
| CN103336205B (en) * | 2013-06-27 | 2016-08-24 | 新疆希望电子有限公司 | Island effect detecting system when a kind of two harmonic currents are injected simultaneously into and method |
| EP3042429A1 (en) * | 2013-09-03 | 2016-07-13 | ABB Technology Ltd. | Redundant point of common coupling (pcc) to reduce risk of microgrid's islanding |
| CN103606950B (en) * | 2013-11-13 | 2016-04-13 | 许继集团有限公司 | A kind of island detection method of distributed wind electric converter |
| CN103645404B (en) * | 2013-12-16 | 2016-03-23 | 辽宁工业大学 | A kind of micro-grid island detection method and detection system |
| CN103809650B (en) * | 2014-02-27 | 2016-01-06 | 华北电力大学（保定） | A kind of equivalent modeling method of photovoltaic generating system |
| CN104007349A (en) * | 2014-06-11 | 2014-08-27 | 江苏大学 | Fuzzy control island detection method based on wavelet transformation |
| CN104198841B (en) * | 2014-08-08 | 2017-03-29 | 武汉理工大学 | A kind of island detection method in photovoltaic combining inverter |
| CN104316786B (en) * | 2014-10-10 | 2017-03-08 | 湖南大学 | A kind of mixing island detection method |
| CN104569742B (en) * | 2015-01-15 | 2017-10-20 | 华南理工大学 | A kind of island detection method suitable for user side micro-capacitance sensor |
| CN104682356B (en) * | 2015-02-10 | 2017-11-07 | 南京能迪电气技术有限公司 | Self-adapting changeable for distributed photovoltaic power loads anti-island method |
| CN104793148B (en) * | 2015-04-30 | 2017-10-13 | 国家电网公司 | Distributed generator islanding detection method based on grid entry point characteristic harmonics voltage measurement |
| CN105372533A (en) * | 2015-11-30 | 2016-03-02 | 国网北京市电力公司 | Method and device of detection of electric power island |
| CN106124890B (en) * | 2016-04-14 | 2019-05-17 | 国网辽宁省电力有限公司电力科学研究院 | A kind of anti-islanding detection method of grid-connected photovoltaic system |
| CN108110785B (en) | 2016-11-24 | 2021-04-20 | 华为技术有限公司 | Inverter anti-islanding control system |
| CN107526009B (en) * | 2017-09-13 | 2019-04-05 | 国电南瑞科技股份有限公司 | It is a kind of that Interlocking Methods are detected according to the isolated island of frequency and curent change timing |
| CN108008253A (en) * | 2017-12-11 | 2018-05-08 | 艾乐德电子（南京）有限公司 | Simulating grid and online load testing system and device and its anti-isolated island test method |
| CN107979091B (en) * | 2017-12-19 | 2021-05-07 | 宁夏大学 | Rapid positive feedback active frequency shift type island detection method |
| ES2928187T3 (en) | 2017-12-20 | 2022-11-16 | Vestas Wind Sys As | Protection against recurring failures for wind power plants |
| CN108333478A (en) * | 2018-02-12 | 2018-07-27 | 哈尔滨理工大学 | A kind of island detection method that FIR bandpass filterings are combined with parameter adaptive AFDPF |
| CN110632532B (en) * | 2018-06-21 | 2022-11-11 | 中国电力科学研究院有限公司 | Test system and method for meeting parallel operation of multiple groups of serial photovoltaic inverters |
| CN109100616B (en) * | 2018-10-23 | 2020-10-09 | 上海正泰电源系统有限公司 | Method for detecting single-phase power failure of transformer with grounding |
| CN110456214A (en) * | 2019-07-22 | 2019-11-15 | 华羿微电子股份有限公司 | A kind of alone island detection system and its method |
| CN111999577A (en) * | 2020-08-06 | 2020-11-27 | 国网山东省电力公司莱芜供电公司 | Active frequency deviation island detection method and device |
| CN112462181A (en) * | 2020-11-20 | 2021-03-09 | 哈尔滨理工大学 | Distributed inverter grid-connected system island detection method based on phase angle random disturbance |
| CN115483709B (en) * | 2022-10-17 | 2023-04-07 | 北京索英电气技术股份有限公司 | Island detection method and device of energy grid-connected system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1893214A (en) * | 2005-07-05 | 2007-01-10 | 沈阳网格电子信息技术有限公司 | Low-voltage photovotaic parallel-in control device |
| CN101034800A (en) * | 2006-03-07 | 2007-09-12 | 卢一民 | Protection control system for isolated island effect prevention of parallel network reverse power generation device and its method |
-
2008
- 2008-01-10 CN CN2008100651717A patent/CN101257209B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1893214A (en) * | 2005-07-05 | 2007-01-10 | 沈阳网格电子信息技术有限公司 | Low-voltage photovotaic parallel-in control device |
| CN101034800A (en) * | 2006-03-07 | 2007-09-12 | 卢一民 | Protection control system for isolated island effect prevention of parallel network reverse power generation device and its method |
Non-Patent Citations (4)
| Title |
|---|
| 张超，何湘宁，赵德安.一种新颖的光伏并网系统孤岛检测方法.电力电子技术41 11.2007,41(11),97-99. |
| 张超,何湘宁,赵德安.一种新颖的光伏并网系统孤岛检测方法.电力电子技术41 11.2007,41(11),97-99. * |
| 肖巧景，张宇翔，郭敏.一种新的频率偏移技术在光伏并网发电系统孤岛检测中的应用.现代电子技术2007 1.2007,2007(1),107-108. |
| 肖巧景,张宇翔,郭敏.一种新的频率偏移技术在光伏并网发电系统孤岛检测中的应用.现代电子技术2007 1.2007,2007(1),107-108. * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9520819B2 (en) | 2014-02-28 | 2016-12-13 | General Electric Company | System and method for controlling a power generation system based on a detected islanding event |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101257209A (en) | 2008-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101257209B (en) | Islet operation detecting method of photovoltaic parallel network generating system | |
| Arulkumar et al. | Recent advances and control techniques in grid connected PV system–A review | |
| CN103412207B (en) | Based on the method for detecting island of photovoltaic grid-connected inverter that negative-sequence current injects | |
| CN101123349B (en) | Island effect detection method based on active frequency deviation and its device | |
| CN102208817A (en) | Reactive-power-disturbance-based grid-connected island detection method for photovoltaic system | |
| CN104009486B (en) | The asymmetry compensation current-limiting method of a kind of three-phase three-wire system SVG | |
| CN103560520B (en) | Unified power quality controller suitable for fault ride-through and control method | |
| CN103091578A (en) | Island detection method of photovoltaic grid-connected system | |
| CN103760434A (en) | Self-adaption phase deviation island detection method based on fuzzy control | |
| CN103645404A (en) | Micro-grid islanding detection method | |
| CN102170142A (en) | Low-voltage ride-through method for photovoltaic inverter | |
| CN102156233A (en) | Method for detecting island by intermittent two-sided reactive power disturbance | |
| CN204030631U (en) | The control device of converter of wind turbine generator | |
| CN101777758A (en) | Method for detecting islanding by frequency deviation applying pulse current interference | |
| CN101217260A (en) | A slip control digital intelligent speed regulation and system of motor without speed transducer | |
| CN108649601A (en) | Wind electric converter low voltage traversing control method based on Hysteresis control and device | |
| CN104101801A (en) | Photovoltaic solar one-stop grid-connected detection system | |
| CN202004458U (en) | Active filter circuit with intelligent communication function | |
| CN105633997A (en) | Wind generating set voltage crossing control method and device | |
| CN102590663A (en) | Improved intermittent reactive power disturbance island detection method | |
| JP2730595B2 (en) | Grid connection equipment for small power generators | |
| CN105633998A (en) | Wind generating set high-voltage crossing control method and device | |
| CN105633999A (en) | High-voltage crossing control method and device under imbalanced sudden rise of power grid voltage | |
| CN102545262A (en) | Method for detecting island of grid-connected photovoltaic power system on basis of electric energy quality constraint | |
| CN110376472B (en) | Photovoltaic grid-connected inverter island detection method based on double-loop current negative feedback control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20100616 Termination date: 20150110 |
|
| EXPY | Termination of patent right or utility model |