CN106353614B - Island detection method and device for direct current system - Google Patents
Island detection method and device for direct current system Download PDFInfo
- Publication number
- CN106353614B CN106353614B CN201610768849.2A CN201610768849A CN106353614B CN 106353614 B CN106353614 B CN 106353614B CN 201610768849 A CN201610768849 A CN 201610768849A CN 106353614 B CN106353614 B CN 106353614B
- Authority
- CN
- China
- Prior art keywords
- direct current
- island
- direct
- power
- power disturbance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 41
- 238000010248 power generation Methods 0.000 claims description 14
- 230000035945 sensitivity Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
Images
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
-
- 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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/002—Intermediate AC, e.g. DC supply with intermediated AC distribution
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
-
- 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
- G01R31/40—Testing power supplies
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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 relates to an island detection method and device for a direct current system, wherein a first power disturbance is injected into a direct current micro-grid, when the variable quantity of grid-connected voltage is detected to be greater than or equal to a first allowable value of a pressure difference absolute value within set time or set times, the direct current micro-grid is diagnosed as a suspected island, then a second power disturbance is injected into the direct current micro-grid, and when the variable quantity of the grid-connected voltage is detected to be greater than or equal to a second allowable value of the pressure difference absolute value within the set time or set times, the island of the direct current system is judged to be generated, an accurate protection criterion is provided for the off-grid of a direct current converter, the island detection efficiency of the direct current system is ensured, and no detection blind zone exists.
Description
Technical Field
The invention relates to an island detection method and device for a direct current system, and belongs to the field of distributed power generation and alternating current and direct current hybrid micro-grids.
Background
With the rapid development of distributed power generation and alternating current and direct current hybrid micro-grids, the problem of island effect in the micro-grid is increasingly prominent.
The islanding effect generally refers to that when power supply is tripped due to a fault accident or power failure maintenance in an alternating current power grid, a distributed grid-connected power generation system of each user end fails to detect a power failure state in time and disconnects the distributed grid-connected power generation system from a commercial power grid, so that a self-powered islanding consisting of the distributed grid-connected power generation system and surrounding loads is formed. Once the islanding is generated, many hazards can be caused, such as impact on power grid protection devices, voltage and frequency deviation of the islanding area, and even life safety of maintenance personnel on a power grid transmission line can be endangered, so that the islanding operation state of the system needs to be monitored by adopting reliable means.
The direct current islanding phenomenon of the alternating current-direct current hybrid micro-grid refers to a state that a system keeps supplying power to a certain part of lines in the grid continuously when the direct current grid is in voltage loss. As shown in fig. 1, when an island occurs, both the large dc power grid and the energy storage dc converter that can be used as a backup power source are disconnected, and a dc island is formed between the photovoltaic dc converter and the dc load. The waveform of the voltage change of the direct-current microgrid before and after the direct-current island occurs in the alternating-current/direct-current hybrid microgrid in fig. 1 is shown in fig. 2, because the output power of the converter is matched with the load power, the voltage of the direct-current microgrid is consistent with the voltage before the island occurs, if an anti-island protection means is not provided at the moment, the island phenomenon cannot be detected, and the island system can continuously run, which is unfavorable for the microgrid. Therefore, in distributed power generation and an alternating current-direct current hybrid micro-grid, a grid-connected power generation device must have a direct current anti-islanding protection function so as to quickly detect the islanding effect and timely disconnect the islanding effect from a main grid.
At present, an island detection method is only limited to an alternating current system, and an island detection method aiming at a direct current system is not available, so that an anti-island protection method suitable for the direct current system is needed to meet the requirements of distributed power generation and development of an alternating current-direct current hybrid micro-grid.
Disclosure of Invention
The invention aims to provide an island detection method and device for a direct current system, which are used for solving the problem of island effect of a direct current micro-grid.
In order to solve the technical problem, the invention provides an island detection method for a direct current system, which comprises the following steps:
judging suspected islands: injecting first power disturbance into the direct current microgrid, detecting the variable quantity of the voltage of the direct current microgrid, and preliminarily diagnosing the direct current microgrid as a suspected island if the variable quantity is greater than or equal to a first allowable value of a set pressure difference absolute value within set time or set times;
judging a direct current island: and after the suspected island is preliminarily diagnosed, injecting second power disturbance into the direct current microgrid, wherein the second power disturbance is larger than the first power disturbance, detecting the variation of the voltage of the direct current microgrid, and if the variation is larger than or equal to a second allowable value of a set pressure difference absolute value within set time or set times, and the second allowable value of the pressure difference absolute value is larger than a first allowable value of the pressure difference absolute value, judging that the direct current island occurs.
And when the voltage variation in the step of judging the direct current islanding is not greater than or equal to a second allowable value of the absolute value of the pressure difference within the set time or the set times, judging that the direct current islanding does not occur.
And if the island detection result of the current direct current system is a suspected island and is not judged to be a direct current island, only the step 2) needs to be executed for island detection of the direct current system next time.
The upper limit of the first power disturbance and the upper limit of the second power disturbance are calculated by the rated output power of the power generation device of the direct-current micro-grid, so that the power variation of the device during grid-connected operation does not exceed 10% of the rated output power.
And the lower limit of the first power disturbance and the lower limit of the second power disturbance are obtained by calculating the voltage grade and the protection sensitivity of the direct current bus, the lower limit of the first power disturbance is smaller than the island protection action threshold, and the lower limit of the second power disturbance is larger than the island protection action threshold.
In order to solve the above technical problem, the present invention further provides an island detection apparatus for a dc system, including:
judging suspected island units: injecting first power disturbance into the direct current microgrid, detecting the variable quantity of the voltage of the direct current microgrid, and preliminarily diagnosing the direct current microgrid as a suspected island if the variable quantity is greater than or equal to a first allowable value of a set pressure difference absolute value within set time or set times;
judging a direct current island unit: and after the suspected island is preliminarily diagnosed, injecting second power disturbance into the direct current microgrid, wherein the second power disturbance is larger than the first power disturbance, detecting the variation of the voltage of the direct current microgrid, and if the variation is larger than or equal to a second allowable value of a set pressure difference absolute value within set time or set times, and the second allowable value of the pressure difference absolute value is larger than a first allowable value of the pressure difference absolute value, judging that the direct current island occurs.
And when the variation of the voltage in the direct current island unit is not larger than or equal to a second allowable value of the absolute value of the pressure difference within the set time or the set times, determining that the direct current island does not occur.
And if the island detection result of the current direct current system is a suspected island and the direct current island is not judged, directly performing island detection of the next direct current system by the direct current island judgment unit.
The upper limit of the first power disturbance and the upper limit of the second power disturbance are calculated by the rated output power of the power generation device of the direct-current micro-grid, so that the power variation of the device during grid-connected operation does not exceed 10% of the rated output power.
And the lower limit of the first power disturbance and the lower limit of the second power disturbance are obtained by calculating the voltage grade and the protection sensitivity of the direct current bus, the lower limit of the first power disturbance is smaller than the island protection action threshold, and the lower limit of the second power disturbance is larger than the island protection action threshold.
The invention has the beneficial effects that: according to the island detection method and device for the direct current system, the power disturbance quantity is added into the direct current micro-grid system, whether the change of grid-connected voltage exceeds the allowable value of the pressure difference or not is detected, whether the system has an island effect or not is further judged, an accurate protection criterion is provided for the grid disconnection of the direct current converter, the island detection efficiency of the direct current system is guaranteed, and no detection blind area exists.
Drawings
FIG. 1 is a diagram of a prior art AC/DC hybrid microgrid system;
FIG. 2 is a grid-connected voltage waveform diagram when a direct current island occurs;
FIG. 3 is a flow chart of a method of the present invention for DC system island detection;
fig. 4 is a grid-connected voltage waveform diagram for the direct current system island detection method.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The embodiment of the island detection method for the direct current system comprises the following steps:
as shown in fig. 1, in the ac/dc hybrid microgrid, both the photovoltaic dc converter and the energy storage dc converter can operate in a grid-connected mode, and after the large dc power grid and the energy storage dc converter which can be used as a backup power supply are both disconnected, an island shown by a dotted arrow in the figure is formed between the photovoltaic dc converter and a dc load.
The island detection process of the invention is shown in fig. 3, and the step of judging suspected islands is as follows: injecting a first power disturbance into the direct current microgrid system, as shown in fig. 4, adding the first power disturbance when the time axis in the figure is 0.3S to reduce the voltage of the direct current microgrid, detecting the variation of the voltage of the direct current microgrid at the moment, and preliminarily judging as a suspected island if the variation is greater than or equal to a first allowable value of a preset differential pressure absolute value within a set time or a set number of times.
Judging a direct current island: after the island is preliminarily judged to be a suspected island, injecting second power disturbance into the direct current microgrid system, wherein the second power disturbance is larger than the first power disturbance, adding the disturbance of the second power to enable the voltage of the direct current microgrid to rise suddenly as shown in fig. 4, detecting the variation of the voltage of the direct current microgrid at the moment, and judging the island to be the direct current island if the variation is larger than or equal to a second allowable value of a preset absolute value of the pressure difference within set time or set times; and if the variation of the voltage of the direct-current microgrid is not greater than or equal to a second allowable value of the absolute value of the pressure difference within the set time or the set times, judging that the direct-current island does not occur.
After the islanding effect is detected, the voltage of the direct current microgrid continuously decreases, and then the occurrence of the direct current islanding is accurately judged, so that a protection criterion is provided for the grid disconnection of the photovoltaic direct current converter shown in fig. 1.
The embodiment needs to determine the first power disturbance value and the second power disturbance value injected into the direct-current microgrid according to the upper limit and the lower limit of the power disturbance quantity. Specifically, the upper limit of the power disturbance quantity is calculated according to the rated output power of the grid-connected power generation device of the direct-current microgrid, and the principle is that the output power change of the device is not more than 10% of the rated output power when the grid-connected power generation device operates in a grid-connected mode. And then calculating the lower limit of the power disturbance quantity according to the bus voltage grade and the protection sensitivity of the system direct current, wherein the lower limit of the first power disturbance is smaller than an island protection action threshold value, the lower limit of the second power disturbance is larger than a direct current island protection action threshold value, and the output grid-connected voltage change can exceed a second allowable value of the absolute value of the pressure difference when the direct current island occurs.
As for the island detection method for the dc system of the present invention, as shown in fig. 3, it is determined whether to perform the step of determining the suspected island by setting and determining the suspected island flag bit to be 1 or 0: and after the suspected island is preliminarily judged, judging that the flag bit of the suspected island is 1, and if the variable quantity of the voltage of the direct current micro-grid is not greater than or equal to a first allowable value of the absolute value of the pressure difference within set time or set times after the first power disturbance is added, judging that the flag bit of the suspected island is 0. When the suspected island is judged and the direct current island does not occur, the flag bit of the suspected island is judged to be kept as 1; and when the direct current island is judged to be generated, the flag bit of the suspected island is judged to be 0.
The purpose of setting and judging the suspected island flag bit is as follows: and if the suspected island is judged in the island detection of the direct current system and the direct current island is not generated, only executing the step of judging the direct current island in the island detection of the direct current system next time.
The direct current system may perform the islanding determination process shown in fig. 3 at regular intervals, or actively trigger the islanding determination process when the islanding effect of the direct current system needs to be detected.
The invention relates to an island detection device for a direct current system.
Judging an island unit: injecting a first power disturbance into the direct current microgrid system, as shown in fig. 4, adding the first power disturbance when the time axis in the figure is 0.3S to reduce the voltage of the direct current microgrid, detecting the variation of the voltage of the direct current microgrid at the moment, and preliminarily judging as a suspected island if the variation is greater than or equal to a first allowable value of a preset differential pressure absolute value within a set time or a set number of times.
And (3) confirming an island unit: after the suspected island is preliminarily determined, injecting second power disturbance into the direct current microgrid system, wherein the second power disturbance is larger than the first power disturbance, as shown in fig. 4, adding the disturbance of the second power to enable the voltage of the direct current microgrid to rise suddenly, detecting the variation of the voltage of the direct current microgrid at the moment, and if the variation is larger than or equal to a second allowable value of a preset absolute value of the voltage difference within a set time or a set number of times, determining that the direct current island occurs.
The islanding detection device for the dc system in the above embodiment is actually a computer solution, i.e. a software component, based on the method flow of the present invention, and the above device is a processing process corresponding to the method flow. The software can be used in a direct current micro-grid system. The method described above is sufficiently clear and complete, and the device claimed in this embodiment is actually a software architecture, and therefore will not be described in detail.
Claims (10)
1. An island detection method for a direct current system, comprising:
1) judging suspected islands: injecting first power disturbance into the direct current microgrid, detecting the variable quantity of the voltage of the direct current microgrid, and preliminarily diagnosing the direct current microgrid as a suspected island if the variable quantity is greater than or equal to a first allowable value of a set pressure difference absolute value within set time or set times;
2) judging a direct current island: and after the suspected island is preliminarily diagnosed, injecting second power disturbance into the direct current microgrid, wherein the second power disturbance is larger than the first power disturbance, detecting the variation of the voltage of the direct current microgrid, and if the variation is larger than or equal to a second allowable value of a set pressure difference absolute value within set time or set times, and the second allowable value of the pressure difference absolute value is larger than a first allowable value of the pressure difference absolute value, judging that the direct current island occurs.
2. The islanding detection method for the direct current system according to claim 1, wherein it is determined that no direct current islanding occurs when the voltage variation in step 2) is not greater than or equal to a second allowable value of the absolute value of the voltage difference within a set time or a set number of times.
3. The island detection method for the direct current system according to claim 2, wherein if the island detection result of the current direct current system is a suspected island and is not determined as a direct current island, the island detection of the next direct current system only needs to execute the step 2).
4. The islanding detection method for the direct-current system according to any one of claims 1 to 3, wherein the upper limit of the first power disturbance and the upper limit of the second power disturbance are calculated from the rated output power of the power generation device of the direct-current microgrid, so that the power variation of the device during grid-connected operation is not more than 10% of the rated output power.
5. The islanding detection method for the direct-current system according to any one of claims 1 to 3, wherein lower limits of the first power disturbance and the second power disturbance are calculated from a direct-current bus voltage level and a protection sensitivity, the lower limit of the first power disturbance is smaller than an islanding protection action threshold, and the lower limit of the second power disturbance is larger than the islanding protection action threshold.
6. An islanding detection apparatus for a dc system, comprising:
judging suspected island units: injecting first power disturbance into the direct current microgrid, detecting the variable quantity of the voltage of the direct current microgrid, and preliminarily diagnosing the direct current microgrid as a suspected island if the variable quantity is greater than or equal to a first allowable value of a set pressure difference absolute value within set time or set times;
judging a direct current island unit: and after the suspected island is preliminarily diagnosed, injecting second power disturbance into the direct current microgrid, wherein the second power disturbance is larger than the first power disturbance, detecting the variation of the voltage of the direct current microgrid, and if the variation is larger than or equal to a second allowable value of a set pressure difference absolute value within set time or set times, and the second allowable value of the pressure difference absolute value is larger than a first allowable value of the pressure difference absolute value, judging that the direct current island occurs.
7. The islanding detection device for the direct-current system according to claim 6, wherein it is determined that no direct-current islanding occurs when it is determined that the amount of change in the voltage in the direct-current islanding unit is not greater than or equal to a second allowable value of the absolute value of the voltage difference within a set time or a set number of times.
8. The island detection device for the direct current system according to claim 7, wherein if the island detection result of the current direct current system is a suspected island and is not determined as a direct current island, the island detection of the next direct current system is directly performed by the direct current island determining unit.
9. The islanding detection device for the direct-current system according to any one of claims 6 to 8, wherein the upper limit of the first power disturbance and the upper limit of the second power disturbance are calculated from the rated output power of the power generation device of the direct-current microgrid, so that the power variation of the device in grid-connected operation does not exceed 10% of the rated output power.
10. The islanding detection device for the direct-current system according to any one of claims 6 to 8, wherein lower limits of the first power disturbance and the second power disturbance are calculated from a direct-current bus voltage level and a protection sensitivity, the lower limit of the first power disturbance is smaller than an islanding protection action threshold, and the lower limit of the second power disturbance is larger than the islanding protection action threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610768849.2A CN106353614B (en) | 2016-08-29 | 2016-08-29 | Island detection method and device for direct current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610768849.2A CN106353614B (en) | 2016-08-29 | 2016-08-29 | Island detection method and device for direct current system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106353614A CN106353614A (en) | 2017-01-25 |
| CN106353614B true CN106353614B (en) | 2020-01-21 |
Family
ID=57856083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610768849.2A Active CN106353614B (en) | 2016-08-29 | 2016-08-29 | Island detection method and device for direct current system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106353614B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165700B (en) * | 2019-04-30 | 2020-09-01 | 浙江大学 | Direct current island detection method based on bus voltage disturbance |
| CN111864795B (en) * | 2020-06-28 | 2022-04-22 | 天津大学 | MPPT trapezoidal voltage disturbance-based direct-current micro-grid island detection method |
| CN112821435B (en) * | 2020-12-31 | 2024-03-22 | 珠海格力电器股份有限公司 | Off-grid scheduling method and device and energy storage power supply system |
| CN117805541B (en) * | 2024-02-29 | 2024-05-03 | 西安千帆翼数字能源技术有限公司 | Island detection method, protection method and related device of energy storage converter |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002142365A (en) * | 2000-11-06 | 2002-05-17 | Toshiba Corp | Dc transmission facility |
| CN102879672A (en) * | 2012-07-11 | 2013-01-16 | 中电普瑞科技有限公司 | Bidirectional active power disturbance island detection method |
| CN104716651A (en) * | 2013-12-12 | 2015-06-17 | 国家电网公司 | Low-frequency reactive power disturbance island detection method for photovoltaic grid-connected inverter |
| TW201534020A (en) * | 2014-02-26 | 2015-09-01 | Fsp Technology Inc | Inverting apparatus and detection method for islanding |
| CN104950194A (en) * | 2014-03-31 | 2015-09-30 | Abb技术有限公司 | Detection of islanding condition in electricity network |
| CN105044511A (en) * | 2015-07-20 | 2015-11-11 | 国家电网公司 | Distributed power supply active islanding detection device and method |
| JP2016010314A (en) * | 2014-06-20 | 2016-01-18 | エスエムエイ ソーラー テクノロジー アクティエンゲゼルシャフトＳＭＡ Ｓｏｌａｒ Ｔｅｃｈｎｏｌｏｇｙ ＡＧ | Method and device for detecting island network condition in energy supply network |
| CN105467237A (en) * | 2015-11-25 | 2016-04-06 | 东方日立(成都)电控设备有限公司 | Positive feedback island detection method based on active current disturbance |
| CN205389108U (en) * | 2015-11-26 | 2016-07-20 | 国家电网公司 | Little electric wire netting isolated island operation detection device |
-
2016
- 2016-08-29 CN CN201610768849.2A patent/CN106353614B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002142365A (en) * | 2000-11-06 | 2002-05-17 | Toshiba Corp | Dc transmission facility |
| CN102879672A (en) * | 2012-07-11 | 2013-01-16 | 中电普瑞科技有限公司 | Bidirectional active power disturbance island detection method |
| CN104716651A (en) * | 2013-12-12 | 2015-06-17 | 国家电网公司 | Low-frequency reactive power disturbance island detection method for photovoltaic grid-connected inverter |
| TW201534020A (en) * | 2014-02-26 | 2015-09-01 | Fsp Technology Inc | Inverting apparatus and detection method for islanding |
| CN104950194A (en) * | 2014-03-31 | 2015-09-30 | Abb技术有限公司 | Detection of islanding condition in electricity network |
| JP2016010314A (en) * | 2014-06-20 | 2016-01-18 | エスエムエイ ソーラー テクノロジー アクティエンゲゼルシャフトＳＭＡ Ｓｏｌａｒ Ｔｅｃｈｎｏｌｏｇｙ ＡＧ | Method and device for detecting island network condition in energy supply network |
| CN105044511A (en) * | 2015-07-20 | 2015-11-11 | 国家电网公司 | Distributed power supply active islanding detection device and method |
| CN105467237A (en) * | 2015-11-25 | 2016-04-06 | 东方日立(成都)电控设备有限公司 | Positive feedback island detection method based on active current disturbance |
| CN205389108U (en) * | 2015-11-26 | 2016-07-20 | 国家电网公司 | Little electric wire netting isolated island operation detection device |
Non-Patent Citations (2)
| Title |
|---|
| 共直流母线型模块化光伏并网发电***相关关键技术研究;李威辰;《中国博士学位论文全文数据库（电子期刊）工程科技Ⅱ辑》;20150715(第07期);第C042-46-78～81页 * |
| 直流微电网孤岛运行研究;郭明伟;《中国优秀硕士学位论文全文数据库（电子期刊）工程科技Ⅱ辑》;20160515(第05期);第C042-746-8～22页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106353614A (en) | 2017-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106353614B (en) | Island detection method and device for direct current system | |
| CN110783946B (en) | Method for locating phase faults in a microgrid | |
| EP3605776A1 (en) | Method for locating phase faults in a microgrid | |
| Isa et al. | Evaluation on non-detection zone of passive islanding detection techniques for synchronous distributed generation | |
| KR20180072476A (en) | PCS for ESS and PCS Operating Method thereof | |
| Bayrak et al. | A novel anti islanding detection method for grid connected fuel cell power generation systems | |
| CN105048489B (en) | A kind of distributed grid-connected electricity generation system quickly detects isolated island method | |
| EP3334000A1 (en) | A method for controlling an electric power distribution micro-grid | |
| CN103323704A (en) | Island detection method based on active current - voltage unbalance degree positive feedback | |
| Choudhry et al. | Power loss reduction in radial distribution system with multiple distributed energy resources through efficient islanding detection | |
| Guha et al. | Anti-islanding techniques for Inverter-based Distributed Generation systems-A survey | |
| CN107947216B (en) | Large-scale alternating current-direct current series-parallel power grid cascading failure early warning and control method and system | |
| CN104820167A (en) | Detection method of commutation failure of direct-current power transmission system | |
| CN104198951A (en) | Reliability validation method of 380V mobile emergency power source of nuclear power station | |
| CN111337777B (en) | Island detection method and device, grid-connected inverter and computer readable storage medium | |
| Elshrief et al. | A new passive islanding detection technique for different zones in utility grid. | |
| US20150233982A1 (en) | Detection of load-shedding of an inverter | |
| CN108008248A (en) | A kind of busbar small current neutral grounding warning system and method based on SCADA | |
| Chang | An islanding detection method for grid-connected inverter of distributed renewable generation system | |
| AU2014221351B2 (en) | Ground fault protection systems and methods | |
| JP2017195775A (en) | Individual operation detection device | |
| Moradzadeh et al. | A novel hybrid islanding detection method for distributed generations | |
| CN107658898A (en) | A kind of anti-isolated island guard method of photovoltaic generation station level and system | |
| Dube et al. | Passive islanding detection technique for multi-DG power system | |
| WO2016149926A1 (en) | Anti-islanding method and device for distributed power source of direct-current electric distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | 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 |