CN108011359A - A kind of isolated island protective device and its detection algorithm for distributed generation resource - Google Patents
A kind of isolated island protective device and its detection algorithm for distributed generation resource Download PDFInfo
- Publication number
- CN108011359A CN108011359A CN201711361142.0A CN201711361142A CN108011359A CN 108011359 A CN108011359 A CN 108011359A CN 201711361142 A CN201711361142 A CN 201711361142A CN 108011359 A CN108011359 A CN 108011359A
- Authority
- CN
- China
- Prior art keywords
- isolated island
- generation resource
- protective device
- distributed generation
- voltage
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of isolated island protective device for distributed generation resource, including step-down transformer, current-limiting reactor, thyristor and controller unit.The present invention manufactures a controlled short circuit current flow and network voltage distortion by certain section internal trigger turn on thyristors near network voltage zero passage；The invention also discloses the detection algorithm of such a isolated island protective device, detection algorithm includes IGBT group angle on-line optimization algorithm and isolated island criterion algorithm.The notable difference of the capacity of short circuit of distributed power access point, the present invention can go out whether distributed generation resource is in islet operation with reliable recognition when being supported based on power grid with departing from.The isolated island protective device of the invention be it is a kind of can distributed installation equipment, do not depend on any medium of communication, cost is low, no signal decay and interference problem.
Description
Technical field
The present invention relates to a kind of isolated island protective device technology for distributed generation resource, belong to distributed power generation protection technique
Field.
Background technology
Distributed power generation source, such as photovoltaic plant, wind power plant, miniature turbine power generation, it is a large amount of to access mesohigh power grid,
But transmission line has the risk disconnected with bulk power grid substation, it is possible to forming the islet operation of distributed generation resource.It is lonely
The distributed generation resource of island operation will jeopardize power grid testing staff, be powered the safety of load equipment and distributed generation resource in itself, state
Border, domestic Grid-connection standards require the distributed generation resource of islet operation reliably to detect island state in limiting time and pacify
Depart from entirely in points of common connection and power grid.
The isolated island protection scheme of distributed generation resource is generally divided into active, passive-type and communication type etc..Wherein actively disturb
Type isolated island detection algorithm is generally used for the distributed generation resource of access low-voltage network, and is realized based on gird-connected inverter and actively disturbed
It is dynamic；Passive-type island detection method is generally fairly simple, easy to implement, but there are larger non-detection area；Communication type isolated island is examined
Survey method is widely used in the distributed power supply system of access mesohigh power grid, but this method needs to build connection upstream substation
With the communication line of distributed generation resource, there are construction cost height and dimension for most of foundation are in distributed generation resource from far-off regions
Protect difficult problem.In addition, the island detection method based on dedicated telephone line cannot effectively identify upstream substation and distribution
The scene that circuit disconnects between power supply.Existing bibliography proposes that the island detection method based on electric line carrier communication can be examined
The scene that transmission line of electricity disconnects is surveyed, but is existed significantly in the receiving side of distributed generation resource there are the transmitted detection signal of transformer substation side
The problem for decaying and being disturbed, raises malfunction and misaction rate.
If a kind of distributed isolated island protective device can be invented, its equipment property right can be most important independently of distributed generation resource business
Be to avoid above-mentioned technology and cost disadvantage, safety, low operating cost and the low-maintenance cost of distributed generation resource will be greatly improved
Operation.
The content of the invention
Technical problem：The present invention is used to solve isolated island protection during distributed generation resource access mesohigh power grid, to solve mesh
It is preceding based on communication modes problem of realizing existing for isolated island protection that the construction period is long, of high cost, reliability is low etc..
Technical solution：The present invention uses following technical scheme：
A kind of isolated island protective device for distributed generation resource, including step-down transformer (1), current-limiting reactor (2), thyristor
(3) and controller unit (4)；The former vice-side winding of step-down transformer (1) can be any combination of triangle or star-like connection；
Current-limiting reactor (2) can be independent inductance, or the leakage inductance of step-down transformer (1) is realized；Thyristor (3) is commercialization
Switching device, can be single device, also can combine to obtain by multiple device connection in series-parallel；Controller unit (4) includes voltage, electric current
Detection part, detection algorithm running unit, thyristor driver signal generator point and protection signal produce part.
Further, the high-pressure side X of the step-down transformer is connected to the downstream of distributed generation resource feeder line breaker,
Low-pressure side connects one end of current-limiting reactor.
Further, anode, the cathode of thyristor of the other end connection thyristor of the current-limiting reactor return to decompression and become
The Trigger Angle signal end of the low-pressure side of depressor, the gate pole connection controller of thyristor.
Further, the controller connection X point voltage measurement signals and T point current measurement signals.
Further, the protection signal end of the controller is connected to circuit-breaker, to perform isolated island trip protection
Operation.
A kind of detection algorithm of isolated island protective device for distributed generation resource, detailed process are as follows：
The first step calculates time domain indexWherein Ipeak_Bef.It is networking shape
Thyristor current flows peak value, I under statepeak_Aft.It is the thyristor current flows peak value under island state；
Second calculates frequency-domain index Δ THD=THDAft.-THDBef., wherein THDBef.It is the public company under networking state
Junction voltage total harmonic distortion (THD) value, THDAft.It is the points of common connection voltage THD values under island state；
Isolated island detection criterion is satisfactionWhen, isolated island occurs.
Further, the on-line optimization flow detailed process at IGBT group angle is as follows：
Initialization definitions predeterminated voltage loss k, minimum trigger angle δ nmin and maximum Trigger Angle δ nmax, then according to isolated island
Protective device is connected across the difference of line voltage or phase voltage, and capacity of short circuit and predeterminated voltage loss k based on access point calculate just
Beginning Trigger Angle δ n；
Connected for phase voltage form：
Connected for line voltage form：
Whether within a preset range initial trigger angle δ n are checked, if otherwise carrying out amplitude limit；
Check thyristor current flows stress, and adjust Trigger Angle；
The loss of voltage percentage of points of common connection is calculated, and adjusts Trigger Angle；
The voltage harmonic content of points of common connection is calculated, and adjusts Trigger Angle；
Export the real-time optimization Trigger Angle under current electric grid state.
Beneficial effect：The present invention is compared with prior art：
The present invention by the public access point of distributed generation resource be incorporated to step-down transformer, current-limiting inductance and thyristor groups into
Controllable short circuit current, access power grid in network voltage zero passage.So that by points of common connection under networking and off-grid state
The difference of capacity of short circuit will produce different short circuit current flow sizes and Voltage Harmonic is horizontal, and the present invention is based on time domain and frequency domain
Index can reliably judge whether isolated island occurs.The present invention realizes the local excitation local detection of isolated island detection, significantly reduces
System cost and the reliability for improving detection.
Brief description of the drawings
The circuit connecting mode schematic diagram of Fig. 1 isolated island protective devices of the present invention when being for single distributed generation resource scene；
Fig. 2 is isolated island protection circuit key job waveform of the present invention and control timing diagram；
Fig. 3 is the present invention when isolated island protective device is connected across phase voltage passage under single distributed generation resource scene before isolated island
Key job oscillogram afterwards；
Fig. 4 is the present invention when isolated island protective device is connected across line voltage passage under single distributed generation resource scene before isolated island
Key job oscillogram afterwards；
Fig. 5 circuit connecting mode schematic diagrames that the invention has been described for the more distributed generation resource scenes of unit feeder；
Fig. 6 is that present invention isolated island protective device 1 under more 2 scenes of distributed generation resource embodiment of unit feeder is connected across phase voltage
Key job oscillogram during passage before and after isolated island；
Fig. 7 is that present invention isolated island protective device under more 2 scenes of distributed generation resource embodiment of unit feeder is connected across phase voltage
Key job oscillogram during passage before and after isolated island；
Fig. 8 is that present invention isolated island protective device 2 under more 2 scenes of distributed generation resource embodiment of unit feeder is connected across phase voltage
Points of common connection voltage waveform and low-order harmonic distribution map before isolated island during passage；
Fig. 9 is that present invention isolated island protective device 2 under more 2 scenes of distributed generation resource embodiment of unit feeder is connected across phase voltage
Points of common connection voltage waveform and low-order harmonic distribution map after isolated island during passage；
Figure 10 is the online Trigger Angle Optimizing Flow figure of the present invention.
Embodiment
As shown in Figure 1, the isolated island protective device by accessing out the installation present invention in the common point of distributed generation resource, passes through
Detection voltage zero-crossing point of power grid and real-time online optimization IGBT group angle in real time, and periodically, by phased manner with rotation ground
Triggering short-circuit loop carries out island state identification to obtain time domain and frequency domain detection index by isolated island criterion.
Embodiment 1：
Fig. 1 the invention has been described embodiments 1 are used for the circuit connecting mode of single distributed generation resource scene, step-down transformer
High-pressure side X be connected to the downstream of distributed generation resource feeder line breaker, low-pressure side connects one end of current-limiting reactor；Current limliting electricity
Anode, the cathode of thyristor of anti-other end connection thyristor returns to the low-pressure side neutral point of step-down transformer, thyristor
Gate pole connects the Trigger Angle signal end of controller；Controller connects X point voltage measurement signals and T point current measurement signals；Control
The protection signal end connection circuit-breaker of device performs the operation of isolated island trip protection.
Fig. 2 is the isolated island protection circuit key job waveform and control sequential of the embodiment of the present invention 1.Isolated island protective device control
Device processed δ angles triggering thyristor before voltage zero-crossing point of power grid forms the short circuit to current-limiting inductance so that on inductive current is quick
Reach peak I when rising to network voltage zero pointpeak, subsequent inductive current under network voltage effect rapid decrease until be zero,
Whole detection operation is completed.The part that detection operation causes points of common connection voltage is can be seen that from test point X voltage waveforms
Loss.
Fig. 3 is the key before and after isolated island when isolated island protective device is connected across phase voltage passage under 1 scene of the embodiment of the present invention
Working waveform figure；Fig. 4 is the pass before and after isolated island when isolated island protective device is connected across line voltage passage under 1 scene of the embodiment of the present invention
Key working waveform figure.Under two kinds of connection modes, peak value of short shows obvious difference before and after isolated island, when only relying on
Domain index Δ IpeakIsland state can be identified.
Embodiment 2：
Fig. 5 the invention has been described embodiments 2 are used for the circuit connecting mode of the more distributed generation resource scenes of unit feeder, in circuit
2. distributed generation resource 1 accesses the node of M1, and isolated island protective device 1 of the invention is connected to line attachment breaker and distributed electrical
Between source 1；Isolated island protective device 2 is connected between line attachment breaker and distributed generation resource 2.
Fig. 6 is the key before and after isolated island when isolated island protective device 1 is connected across phase voltage passage under 2 scene of the embodiment of the present invention
Working waveform figure；Fig. 7 is the pass before and after isolated island when isolated island protective device is connected across phase voltage passage under 2 scene of the embodiment of the present invention
Key working waveform figure.After isolated island occurs, the peak value of short of isolated island protective device 1 has reduction, but isolated island protective device 2 is short
Road current peak reduces unobvious, and after the disengagement of distributed generation resource 1, there occurs obvious for the short circuit current flow of isolated island protective device 2
Change.Therefore, single time domain index Δ IpeakDifferentiate that the island state under more distributed generation resource scenes has delay.
Fig. 8 is commonly connected before isolated island when isolated island protective device 2 is connected across phase voltage passage under 2 scene of the embodiment of the present invention
Point voltage waveform and low-order harmonic distribution map；Fig. 9 is that isolated island protective device 2 is connected across phase voltage under 2 scene of the embodiment of the present invention
Points of common connection voltage waveform and low-order harmonic distribution map after isolated island during passage.Frequency-domain index Δ THD is explicitly indicated before and after isolated island
The generation of island state, therefore, based on time-domain and frequency-domain combined index more distributed generation resource scenes be it is a kind of in time, efficiently, it is accurate
Standby isolated island method of discrimination.
Two kinds of embodiments of the invention described in detail above, still, during present invention is not limited to the embodiments described above
Detail, in the range of the technology design of the present invention, a variety of equivalents can be carried out to technical scheme, this
A little equivalents belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.In addition, any group can also be carried out between a variety of embodiments of the present invention
Close, as long as it without prejudice to the thought of the present invention, it should equally be considered as content disclosed in this invention.
Claims (7)
- A kind of 1. isolated island protective device for distributed generation resource, it is characterised in that：Including step-down transformer (1), current-limiting reactor (2), thyristor (3) and controller unit (4)；The former vice-side winding of step-down transformer (1) can be triangle or star-like connection Any combination；Current-limiting reactor (2) can be independent inductance, or the leakage inductance of step-down transformer (1) is realized；Brilliant lock It is commercial switching device to manage (3), can be single device, also can combine to obtain by multiple device connection in series-parallel；Controller unit (4) wraps Include voltage, current detecting part, detection algorithm running unit, thyristor driver signal generator point and protection signal generating unit Point.
- 2. the isolated island protective device according to claim 1 for distributed generation resource, it is characterised in that：The downconverter The high-pressure side X of device is connected to the downstream of distributed generation resource feeder line breaker, and low-pressure side connects one end of current-limiting reactor.
- 3. the isolated island protective device according to claim 1 for distributed generation resource, it is characterised in that：The current-limiting reactor The other end connection anode of thyristor, the cathode of thyristor return to the gate pole connection of the low-pressure side of step-down transformer, thyristor The Trigger Angle signal end of controller.
- 4. the isolated island protective device according to claim 1 for distributed generation resource, it is characterised in that：The controller connects Connect X point voltage measurement signals and T point current measurement signals.
- 5. the isolated island protective device according to claim 1 for distributed generation resource, it is characterised in that：The controller Protection signal end is connected to circuit-breaker, to perform the operation of isolated island trip protection.
- A kind of 6. detection algorithm of the isolated island protective device as claimed in claim 1 for distributed generation resource, it is characterised in that： Detailed process is as follows：The first step calculates time domain indexWherein Ipeak_Bef.It is under networking state Thyristor current flows peak value, Ipeak_Aft.It is the thyristor current flows peak value under island state；Second calculates frequency-domain index Δ THD=THDAft.-THDBef., wherein THDBef.It is the points of common connection under networking state Voltage total harmonic distortion (THD) value, THDAft.It is the points of common connection voltage THD values under island state；Isolated island detection criterion is satisfactionWhen, isolated island occurs.
- 7. the detection algorithm of the isolated island protective device according to claim 6 for distributed generation resource, it is characterised in that：It is brilliant The on-line optimization flow detailed process of brake tube Trigger Angle is as follows：Initialization definitions predeterminated voltage loss k, minimum trigger angle δ nmin and maximum Trigger Angle δ nmax, are then protected according to isolated island Device is connected across the difference of line voltage or phase voltage, and capacity of short circuit and predeterminated voltage loss k based on access point calculate initial touch Send out angle δ n；Connected for phase voltage form：Connected for line voltage form：Whether within a preset range initial trigger angle δ n are checked, if otherwise carrying out amplitude limit；Check thyristor current flows stress, and adjust Trigger Angle；The loss of voltage percentage of points of common connection is calculated, and adjusts Trigger Angle；The voltage harmonic content of points of common connection is calculated, and adjusts Trigger Angle；Export the real-time optimization Trigger Angle under current electric grid state.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711361142.0A CN108011359B (en) | 2017-12-18 | 2017-12-18 | A kind of isolated island protective device and its detection algorithm for distributed generation resource |
| PCT/CN2018/110585 WO2019119947A1 (en) | 2017-12-18 | 2018-10-17 | Islanding protection device for distributed power supply and detection algorithm thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711361142.0A CN108011359B (en) | 2017-12-18 | 2017-12-18 | A kind of isolated island protective device and its detection algorithm for distributed generation resource |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108011359A true CN108011359A (en) | 2018-05-08 |
| CN108011359B CN108011359B (en) | 2019-08-20 |
Family
ID=62059612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711361142.0A Active CN108011359B (en) | 2017-12-18 | 2017-12-18 | A kind of isolated island protective device and its detection algorithm for distributed generation resource |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108011359B (en) |
| WO (1) | WO2019119947A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019119947A1 (en) * | 2017-12-18 | 2019-06-27 | 东南大学 | Islanding protection device for distributed power supply and detection algorithm thereof |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113572193B (en) * | 2021-06-30 | 2024-07-19 | 国网河北省电力有限公司电力科学研究院 | Distributed power island operation state identification method, fusion terminal and system |
| CN113964801B (en) * | 2021-10-13 | 2024-06-18 | 南京南瑞继保电气有限公司 | Distance protection optimization method and device for high-voltage line protection device |
| CN113991598B (en) * | 2021-11-29 | 2023-08-08 | 深圳供电局有限公司 | Three-phase reclosing method of inversion type distributed power supply |
| CN114336541B (en) * | 2021-12-01 | 2023-07-28 | 国网辽宁省电力有限公司锦州供电公司 | Island protection configuration prevention method for different voltage classes |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185335A (en) * | 2011-05-05 | 2011-09-14 | 山东电力研究院 | Novel island detection method and system |
| CN105024403A (en) * | 2015-07-24 | 2015-11-04 | 国网天津市电力公司 | Islanding and grid-connected signal control system and method for micro power grid |
| CN106443501A (en) * | 2016-10-27 | 2017-02-22 | 广东电网有限责任公司茂名供电局 | Method and system for detecting distributed power supply isolated island |
| CN107294128A (en) * | 2017-06-01 | 2017-10-24 | 南京南瑞继保电气有限公司 | A kind of distributed power source integrates anti-isolated island protection system and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108011359B (en) * | 2017-12-18 | 2019-08-20 | 东南大学 | A kind of isolated island protective device and its detection algorithm for distributed generation resource |
-
2017
- 2017-12-18 CN CN201711361142.0A patent/CN108011359B/en active Active
-
2018
- 2018-10-17 WO PCT/CN2018/110585 patent/WO2019119947A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185335A (en) * | 2011-05-05 | 2011-09-14 | 山东电力研究院 | Novel island detection method and system |
| CN105024403A (en) * | 2015-07-24 | 2015-11-04 | 国网天津市电力公司 | Islanding and grid-connected signal control system and method for micro power grid |
| CN106443501A (en) * | 2016-10-27 | 2017-02-22 | 广东电网有限责任公司茂名供电局 | Method and system for detecting distributed power supply isolated island |
| CN107294128A (en) * | 2017-06-01 | 2017-10-24 | 南京南瑞继保电气有限公司 | A kind of distributed power source integrates anti-isolated island protection system and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019119947A1 (en) * | 2017-12-18 | 2019-06-27 | 东南大学 | Islanding protection device for distributed power supply and detection algorithm thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108011359B (en) | 2019-08-20 |
| WO2019119947A1 (en) | 2019-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108011359B (en) | A kind of isolated island protective device and its detection algorithm for distributed generation resource | |
| CN103124068B (en) | A kind of anti-island protect system of distributed power generation grid-connected system and guard method thereof | |
| CN104101801B (en) | The one-stop grid-connected detecting system of photovoltaic solar | |
| CN101794988B (en) | Method for detecting piconet island state | |
| CN104362667A (en) | Cooperative control method of high and low voltage ride-through for doubly-fed wind turbine set | |
| CN105334390B (en) | Outside suitable for multimachine assembly concentrates disturbance formula impedance measurement isolated island detection method | |
| Wang et al. | Three-phase adaptive auto-reclosing for single outgoing line of wind farm based on active detection from STATCOM | |
| CN105044511A (en) | Distributed power supply active islanding detection device and method | |
| Wang et al. | Adaptive reclosing strategy for single outgoing line of converter-interfaced wind park using distance relaying algorithm | |
| Kasar et al. | A new fast detection module for short-circuit current detection in PV grid system | |
| CN104655957A (en) | Active and passive integrated mixed island detection method | |
| CN113972634B (en) | Micro-grid differential protection method for self-adaptive zero-sequence energy injection | |
| Zhang et al. | Active detection fault diagnosis and fault location technology for LVDC distribution networks | |
| CN112636312B (en) | Micro-grid protection method based on injected zero-sequence characteristic signal | |
| CN207117195U (en) | The anti-isolated island device of new-energy grid-connected power supply | |
| Dai et al. | Active islanding detection method based on grid-connected photovoltaic inverter and negative sequence current injection | |
| CN201956675U (en) | Distributed generation island detection system based on power-frequency carrier | |
| CN103050990A (en) | Distributed power generation system for carrying out island detection by adopting wavelet transformation | |
| CN214335110U (en) | Instantaneous grounding current injection method line selection device for medium-voltage power grid | |
| Sarangi et al. | Active islanding detection and analysis of total harmonic distortion for inverter-interfaced microgrid based on high-frequency signal installation | |
| Singh et al. | Islanding detection using Hilbert Transform in a distributed generation environment | |
| CN112117777A (en) | Photovoltaic grid-connected island detection method based on injected zero-sequence current | |
| CN104330707A (en) | Island detection system and island detection method | |
| CN104518511A (en) | Concurrent control process voltage compensating method of energy storage system at tail end of power distribution network | |
| Artale et al. | Enhanced islanding detection in smart interface protection systems of distributed generation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |