CN107681688A - Possess the grid-connected converter and its isolated island method of discrimination and device of VSG features - Google Patents
Possess the grid-connected converter and its isolated island method of discrimination and device of VSG features Download PDFInfo
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- CN107681688A CN107681688A CN201710855172.0A CN201710855172A CN107681688A CN 107681688 A CN107681688 A CN 107681688A CN 201710855172 A CN201710855172 A CN 201710855172A CN 107681688 A CN107681688 A CN 107681688A
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- voltage
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- vsg
- isolated island
- connected converter
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to the grid-connected converter for possessing VSG features and its isolated island method of discrimination and device, the present invention is directed to the grid-connected converter using VSG technologies, using the voltage disturbance method of grid side, forward voltage disturbance or negative voltage disturbance by a small margin is carried out to line voltage, and give reference value using the voltage after disturbance as the output voltage of grid-connected converter, when the grid side voltage after voltage persistent disturbances is more than first voltage threshold value or less than second voltage threshold value, judge isolated island occurs.The present invention can quickly recognize island phenomenon, and the voltage very little disturbed every time, not influence the stability and reliability to network system.
Description
Technical field
The invention belongs to intelligent power grid technology field, and in particular to the grid-connected converter and its isolated island for possessing VSG features are sentenced
Other method and apparatus.
Background technology
With being continuously increased for distributed power source permeability, the spinning reserve capacity and rotary inertia in power system are relative
Reduce, this safe and stable operation to power network brings severe challenge.In recent years, virtual synchronous generator (Virtual
Synchronous Generator, VSG) technology turn into domestic and foreign scholars study hotspot.Being exactly on VSG technological essences will simultaneously
The droop characteristic and inertia and damping characteristic of conventional synchronization generator are implanted into the control strategy of net current transformer, and then can be joined
Pressure regulation, frequency modulation with power network, the quick change and system oscillation of voltage and frequency in the case of disturbance are avoided, possesses current transformer
" power network friendly " feature and attributes of network.
In the prior art, conventional grid-connected converter typically uses Power Control or Direct Current Control, its active orphan
Island differentiates the methods of output being substantially to combining inverter uses frequency displacement, power disturbance or harmonic injection, this kind of detection side
Grid-connected converter of the method both for current-control type.
And the grid-connected converter based on VSG technologies power network disconnection after, it still keeps voltage source external characteristics, voltage and frequency
All keep stable, existing frequency displacement or power etc. are introduced into the detection method of disturbance because that can not break putting down for voltage in power network or frequency
Weighing apparatus causes isolated island to differentiate failure, it is therefore desirable to which a kind of active isolated island method of discrimination carries out isolated island to the current transformer with VSG features
Detection.
The content of the invention
It is an object of the invention to provide a kind of grid-connected converter for possessing VSG features and its isolated island method of discrimination and device,
Isolated island be present in the grid-connected converter that can not detect to possess VSG features for solving the problems, such as existing active isolated island detection technique.
In order to solve the above technical problems, the present invention proposes a kind of grid-connected converter isolated island method of discrimination for possessing VSG features,
Comprise the following steps：
It is described possess VSG features grid-connected converter it is grid-connected after, grid side voltage is carried out lasting positively or negatively electric
Pressure disturbance, and using positively or negatively output voltage of the grid side magnitude of voltage after voltage disturbance as the grid-connected converter every time
Given reference value, detects every time the grid side voltage condition after positively or negatively voltage disturbance, after forward voltage persistent disturbances
Grid side voltage when being more than the first voltage threshold value of setting, or grid side voltage after negative voltage persistent disturbances is less than and sets
During fixed second voltage threshold value, isolated island is judged.
Further, grid side voltage after positively or negatively voltage persistent disturbances returns to the voltage of normal operating condition
When, judge that isolated island does not occur.
Further, the grid-connected converter for possessing VSG features is electric before grid-connected, in addition to by grid-connected converter outlet side
Pressure and the difference in magnitude of grid side voltage and phase difference carry out the step of presynchronization grid-connected adjustment.
In order to solve the above technical problems, the present invention also proposes that a kind of grid-connected converter isolated island for possessing VSG features differentiates dress
Put, including with lower unit：
Disturb unit：For the grid-connected converter for possessing VSG features after grid-connected, grid side voltage is continued
Positively or negatively voltage disturbance, using every time positively or negatively the grid side magnitude of voltage after voltage disturbance as the grid-connected converter
The output voltage of device gives reference value；
Comparing unit：For the grid side voltage after comparing each forward voltage disturbance of collection and the first voltage set
Threshold value, or compare the grid side voltage after each negative voltage disturbance of collection and the second voltage threshold value of setting；
Judging unit：For when the grid side voltage after forward voltage persistent disturbances is more than first voltage threshold value, or work as
When grid side voltage after negative voltage persistent disturbances is less than second voltage threshold value, isolated island is judged.
Further, in addition to for grid side voltage after positively or negatively voltage persistent disturbances normal operation is returned to
During the voltage of state, judge isolated island without the unit occurred.
Further, in addition to for by the difference in magnitude and phase difference of grid-connected converter outlet side voltage and grid side voltage
Carry out the unit of the grid-connected adjustment of presynchronization.
In order to solve the above technical problems, the present invention also proposes a kind of grid-connected converter for possessing VSG features, including current transformer
Main circuit and control system, wherein, control system includes excitation controller, and isolated island discrimination module, the isolated island discrimination module bag
Include with lower unit：
Disturb unit：For the grid-connected converter for possessing VSG features after grid-connected, grid side voltage is continued
Positively or negatively voltage disturbance, using every time positively or negatively the grid side magnitude of voltage after voltage disturbance as the grid-connected converter
The output voltage of device gives reference value；
Comparing unit：For the grid side voltage after comparing each forward voltage disturbance of collection and the first voltage set
Threshold value, or compare the grid side voltage after each negative voltage disturbance of collection and the second voltage threshold value of setting；
Judging unit：For when the grid side voltage after forward voltage persistent disturbances is more than first voltage threshold value, or work as
When grid side voltage after negative voltage persistent disturbances is less than second voltage threshold value, isolated island is judged.
Further, the isolated island discrimination module also includes being used for the electricity of grid side after positively or negatively voltage persistent disturbances
When pressure returns to the voltage of normal operating condition, judge isolated island without the unit occurred.
Further, the isolated island discrimination module also includes being used in the grid-connected converter for possessing VSG features grid-connected
Before, by the list of difference in magnitude and phase difference the progress grid-connected adjustment of presynchronization of grid-connected converter outlet side voltage and grid side voltage
Member.
The beneficial effects of the invention are as follows：The present invention is for possessing the grid-connected converter of VSG technologies, using the voltage of grid side
Perturbation motion method, forward voltage disturbance or negative voltage disturbance by a small margin are carried out to line voltage, and the voltage after disturbance is made
Reference value is given for the output voltage of grid-connected converter, grid side voltage after voltage persistent disturbances is more than first voltage threshold value
Or during less than second voltage threshold value, judge isolated island occurs.The present invention can quickly recognize island phenomenon, and be disturbed every time
Dynamic voltage very little, stability and reliability to network system are not influenceed.
Brief description of the drawings
Fig. 1 is the general frame figure for the grid-connected converter access power network for possessing VSG features；
Fig. 2 is the control algolithm block diagram that the present invention is implemented；
Fig. 3 is the implementation process figure of active isolated island method of discrimination of the present invention；
Fig. 4 is the analogous diagram of the isolated island method of discrimination of the present invention.
Embodiment
The embodiment of the present invention is further described below in conjunction with the accompanying drawings.
As shown in figure 1, VSG mainly includes main circuit of converter and control system.Wherein, main circuit of converter is conventional
Combining inverter topology, including DC voltage source (generally light storage or wind storage etc., can be considered prime mover), DC/AC current transformers
Deng (the electric energy conversion process of corresponding synchronous generator), wherein DC/AC current transformers include the unsteady flow and filtering link of current transformer；
Control system is to realize VSG core, mainly including control algolithm, presynchronization algorithm and active isolated island distinguished number.
Control algolithm is as shown in Fig. 2 virtual excitation controller and virtual speed regulator and inertia damping link belong to VSG
Control algolithm, it distinguishes output voltage amplitude reference value E*And phase theta0, it is through amplitude and phasing unit, current transformer is defeated
Go out the phase difference of side voltage and grid side voltage and difference in magnitude be adjusted in the range of very little after close a floodgate it is grid-connected, will after grid-connected
Grid side voltage and current transformer outlet side voltage are sent into active isolated island discrimination module, isolated island differentiation side of the module by the present invention
After method carries out isolated island differentiation, finally it is sent into voltage and current double closed-loop and carries out PWM controls.
The flow of the grid-connected converter isolated island method of discrimination (i.e. above-mentioned control algolithm) for possessing VSG features of the present invention is as schemed
Shown in 3, comprise the following steps：
Step 1, initialize relevant parameter：The rated frequency f being related to including VSG control algolithmsN, rated voltage E0, it is initial
Active-power P0, reactive power QNAnd inertia J and damping parameter D, in addition to the phase that presynchronization and isolated island method of discrimination are related to
Poor threshold xiθ, voltage difference threshold xiu, phase adjusted step-length stepTheta, voltage-regulation step-length stepU, actual phase difference regulated quantity
D θ, actual web value difference regulated quantity dU, voltage lowest threshold UminAnd the parameter such as disturbance step-length step.
Step 2, the grid-connected converters of VSG features is grid-connected preceding, it is necessary to presynchronization be carried out, by grid-connected converter outlet side
The difference in magnitude and phase difference of voltage and grid side voltage are adjusted, specific as follows：
As shown in figure 1, switch K2 is closed, K1 and K3 disconnect, grid-connected converter no-load running, gather the three-phase electricity of grid side
Press Ugabc, the three-phase voltage U of current transformer outlet sideabc, the voltage of current transformer outlet side is obtained after VSG control algolithms to tentering
Value E* and phase theta0, read the amplitude U that grid side voltage obtains after phaselocked loopdgAnd phase thetag, define current transformer outlet side electricity
Pressure and the difference in magnitude and phase difference of grid side voltage, calculating formula are：
In formula, UrefoutTo power network disturb lower VSG output voltage peak value, Δ U be current transformer outlet side voltage and
The difference in magnitude of grid side voltage, Δ θ are the phase difference of current transformer outlet side voltage and grid side voltage, and dU becomes for adjustable difference in magnitude
Amount, d θ are adjustable phase difference variable, and wherein d θ and dU initial value design is the phase that 0, θ is current transformer outlet side voltage.
Whether presynchronization algorithm as shown in Figure 3, the absolute value for comparing Δ θ are less than or equal to the phase difference threshold of setting
ξθ, whether Δ U absolute value is less than or equal to the voltage difference threshold xi setu, to actual web value difference regulated variable dU and actual phase
Potential difference regulated variable d θ are modified：
In formula, stepTheta is phase adjusted step-length, and stepU is that voltage-regulation step-length, sign1 and sign2 are for amendment
Number, value is respectively 1, -1 or 0, as Δ θ ＞ ξθWhen, sign1=1, as Δ θ ＜-ξθWhen, sign1=-1, when | Δ θ |≤ξθ
When, sign1=0；As Δ U ＞ ξuWhen, sign2=1, as Δ U ＜ ξuWhen, sign2=-1, when | Δ U |≤ξuWhen, sign2=0.
Difference in magnitude regulated variable dU and phase adjusted difference variable d θ are carried out after constantly correcting, be less than when Δ θ absolute value or
Equal to the phase difference threshold ξ of settingθ, Δ U absolute value is less than or equal to the voltage difference threshold xi setuWhen, it is believed that presynchronization is complete
Into meeting combined floodgate grid-connected conditions, can close grid-connected switch K1 at any time, close and realize immediately after K1 grid-connected without impacting, then close
Close load switch K3 run with loads.
Step 3, the isolated island after current transformer is grid-connected differentiate that process is：By grid side voltage magnitude UdgReduce step-length step, i.e.,
Carry out once bearing disturbance (positive disturbance can also be carried out in fact, be described with negative disturbance here), the value that wherein step is set
Very small (for example being set to 0.02V or the value of other very littles), given reference of the value as current transformer outlet side voltage after disturbance
Value, calculating formula are：
Urefout=Udg-step
In formula, line voltage is reduced into step, that is, has carried out a negative sense disturbance, the value after disturbance is defeated as current transformer
Go out side Voltage Reference amplitude, the disturbance constantly circulates progress, then when disturbing next time, program continues to read line voltage UdgIf
Power network normally connects, then UdgKeep constant (even if line voltage has fluctuation, then UdgAlso can be in normal range (NR))；It is if electric
Net disconnects, and due to losing power network support, then grid side three-phase voltage is exactly current transformer outlet side three-phase voltage, its voltage magnitude Udg
=Urefout, to UdgCirculation disturbance will cause UrefoutReduce always, work as UrefoutLess than voltage lowest threshold UminWhen, you can
Determine island phenomenon.
The invention belongs to a kind of new active isolated island method of discrimination, for possessing the grid-connected converter of VSG technologies, its active
Isolated island method of discrimination is to be carried out according to by line voltage from disturbing, and the mode of disturbance both can be the negative sense electricity that the present embodiment is carried
The persistent disturbances of pressure or the persistent disturbances of forward voltage, its difference are：When isolated island occurs for power network, apply negative sense
Voltage disturbance mode makes the magnitude of voltage of grid side constantly reduce, when being reduced to voltage lowest threshold UminWhen, judge isolated island occurs,
And it is then that the magnitude of voltage for making grid side constantly increases to apply forward voltage perturbation scheme, when the voltage threshold for increasing to a setting
When judge occur isolated island；When not isolated island occurs for power network, no matter grid side voltage persistently carry out negative voltage disturbance or
Forward voltage disturbs, and the voltage of grid side can return to normal operating voltage eventually.The present invention grid side is disturbed after electricity
Pressure value assigns the set-point of current transformer output voltage, and disturbed value is very small, and the stability of a system is not influenceed substantially, and the party
Method significant effect, island phenomenon can be quickly recognized.
The present invention also proposes a kind of grid-connected converter isolated island discriminating gear for possessing VSG features respectively, and one kind possesses
The grid-connected converter of VSG features.Wherein, the grid-connected converter isolated island discriminating gear for possessing VSG features includes following three units：
Disturb unit：For possessing the grid-connected converter of VSG features after grid-connected, grid side voltage is carried out it is lasting just
To or negative voltage disturbance, using positively or negatively output of the grid side magnitude of voltage after voltage disturbance as grid-connected converter every time
Voltage gives reference value；
Comparing unit：For the grid side voltage after comparing each forward voltage disturbance of collection and the first voltage set
Threshold value, or compare the grid side voltage after each negative voltage disturbance of collection and the second voltage threshold value of setting；
Judging unit：For when the grid side voltage after forward voltage persistent disturbances is more than first voltage threshold value, or work as
When grid side voltage after negative voltage persistent disturbances is less than second voltage threshold value, isolated island is judged.
And the grid-connected converter for possessing VSG features is the DC/AC current transformers in VSG shown in Fig. 1, its hardware configuration is existing
There is technology, its control system includes excitation controller, voltage and current double closed-loop and isolated island discrimination module, the isolated island discrimination module bag
Three units included are identical with possessing three units that the grid-connected converter isolated island discriminating gear of VSG features includes.
The above-mentioned signified grid-connected converter isolated island discriminating gear for possessing VSG features, is actually based on the inventive method
A kind of computer solution of flow, i.e., a kind of software architecture, may apply in VSG control system, said apparatus is
For the treatment progress corresponding with method flow.Equally, possess isolated island discrimination module in the grid-connected converter of VSG features, and
The treatment progress corresponding with method flow.Due to the introduction to the above method, sufficiently clear is complete, and the present invention claims
Grid-connected converter isolated island discriminating gear and isolated island discrimination module be actually a kind of software architecture, therefore no longer retouched in detail
State.
Claims (9)
1. a kind of grid-connected converter isolated island method of discrimination for possessing VSG features, it is characterised in that comprise the following steps：
It is described possess VSG features grid-connected converter it is grid-connected after, lasting positively or negatively voltage is carried out to grid side voltage and is disturbed
It is dynamic, and the grid side magnitude of voltage every time positively or negatively after voltage disturbance is given as the output voltage of the grid-connected converter
Reference value, detect every time the grid side voltage condition after positively or negatively voltage disturbance, electricity after forward voltage persistent disturbances
When voltage on line side is more than the first voltage threshold value of setting, or grid side voltage after negative voltage persistent disturbances is less than setting
During second voltage threshold value, isolated island is judged.
2. the grid-connected converter isolated island method of discrimination according to claim 1 for possessing VSG features, it is characterised in that when just
To or negative voltage persistent disturbances after grid side voltage return to the voltage of normal operating condition when, judge isolated island do not send out
It is raw.
3. the grid-connected converter isolated island method of discrimination according to claim 1 for possessing VSG features, it is characterised in that described
Possess the grid-connected converter of VSG features before grid-connected, in addition to the width by grid-connected converter outlet side voltage and grid side voltage
Value difference and phase difference carry out the step of presynchronization grid-connected adjustment.
4. a kind of grid-connected converter isolated island discriminating gear for possessing VSG features, it is characterised in that including with lower unit：
Disturb unit：For the grid-connected converter for possessing VSG features after grid-connected, grid side voltage is carried out it is lasting just
To or negative voltage disturbance, using every time positively or negatively the grid side magnitude of voltage after voltage disturbance as the grid-connected converter
Output voltage gives reference value；
Comparing unit：For the grid side voltage after comparing each forward voltage disturbance of collection and the first voltage threshold set
Value, or compare the grid side voltage after each negative voltage disturbance of collection and the second voltage threshold value of setting；
Judging unit：For when the grid side voltage after forward voltage persistent disturbances is more than first voltage threshold value, or work as negative sense
When grid side voltage after voltage persistent disturbances is less than second voltage threshold value, isolated island is judged.
5. the grid-connected converter isolated island discriminating gear according to claim 4 for possessing VSG features, it is characterised in that also wrap
Include lonely for when the grid side voltage after positively or negatively voltage persistent disturbances returns to the voltage of normal operating condition, judging
Island is without the unit occurred.
6. the grid-connected converter isolated island discriminating gear according to claim 4 for possessing VSG features, it is characterised in that also wrap
Include for the difference in magnitude of grid-connected converter outlet side voltage and grid side voltage and phase difference to be carried out into the grid-connected adjustment of presynchronization
Unit.
7. a kind of grid-connected converter for possessing VSG features, including main circuit of converter and control system, wherein, control system bag
Include excitation controller, it is characterised in that the control system also includes isolated island discrimination module, the isolated island discrimination module include with
Lower unit：
Disturb unit：For the grid-connected converter for possessing VSG features after grid-connected, grid side voltage is carried out it is lasting just
To or negative voltage disturbance, using every time positively or negatively the grid side magnitude of voltage after voltage disturbance as the grid-connected converter
Output voltage gives reference value；
Comparing unit：For the grid side voltage after comparing each forward voltage disturbance of collection and the first voltage threshold set
Value, or compare the grid side voltage after each negative voltage disturbance of collection and the second voltage threshold value of setting；
Judging unit：For when the grid side voltage after forward voltage persistent disturbances is more than first voltage threshold value, or work as negative sense
When grid side voltage after voltage persistent disturbances is less than second voltage threshold value, isolated island is judged.
8. the grid-connected converter according to claim 7 for possessing VSG features, it is characterised in that the isolated island discrimination module
Also include being used to, when the grid side voltage after positively or negatively voltage persistent disturbances returns to the voltage of normal operating condition, sentence
Isolated island is determined without the unit occurred.
9. the grid-connected converter according to claim 7 for possessing VSG features, it is characterised in that the isolated island discrimination module
Also include being used in the grid-connected converter for possessing VSG features before grid-connected, by grid-connected converter outlet side voltage and power network
The difference in magnitude and phase difference of side voltage carry out the unit of the grid-connected adjustment of presynchronization.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2017103588305 | 2017-05-19 | ||
| CN201710358830 | 2017-05-19 |
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| CN107681688A true CN107681688A (en) | 2018-02-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242815A (en) * | 2018-03-30 | 2018-07-03 | 华北电力科学研究院有限责任公司 | Fall the wind turbine energy storage supplied for power of fan and coordinate frequency modulation system and method |
| CN109672207A (en) * | 2018-12-04 | 2019-04-23 | 国网江苏省电力有限公司电力科学研究院 | A kind of back-to-back system (CCC-0) control method and system based on virtual synchronous machine |
| US11777322B2 (en) | 2020-06-03 | 2023-10-03 | Delta Electronics (Shanghai) Co., Ltd | Islanding detection mothod for inverter and apparatus |
| US11936310B2 (en) | 2020-06-03 | 2024-03-19 | Delta Electronics (Shanghai) Co., Ltd | Control method and device for three-phase AC system |
| CN117805541A (en) * | 2024-02-29 | 2024-04-02 | 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 (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412592A (en) * | 2011-10-09 | 2012-04-11 | 山亿新能源股份有限公司 | Island detection method and system of photovoltaic grid-connected generation 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 |
| CN104767219A (en) * | 2015-03-27 | 2015-07-08 | 国家电网公司 | Household grid-connected inverter control strategy based on virtual synchronous generator |
| US20150357820A1 (en) * | 2012-12-27 | 2015-12-10 | Kawasaki Jukogyo Kabushiki Kaisha | Combined power generation system having power converting apparatus |
| CN105606921A (en) * | 2015-11-26 | 2016-05-25 | 国家电网公司 | Negative sequence voltage positive feedback-based islanding detection system and method |
-
2017
- 2017-09-20 CN CN201710855172.0A patent/CN107681688B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102412592A (en) * | 2011-10-09 | 2012-04-11 | 山亿新能源股份有限公司 | Island detection method and system of photovoltaic grid-connected generation system |
| US20150357820A1 (en) * | 2012-12-27 | 2015-12-10 | Kawasaki Jukogyo Kabushiki Kaisha | Combined power generation system having power converting apparatus |
| CN104767219A (en) * | 2015-03-27 | 2015-07-08 | 国家电网公司 | Household grid-connected inverter control strategy based on virtual synchronous generator |
| CN105606921A (en) * | 2015-11-26 | 2016-05-25 | 国家电网公司 | Negative sequence voltage positive feedback-based islanding detection system and method |
Non-Patent Citations (2)
| Title |
|---|
| 余运俊 等: "光伏微网主动式孤岛检测方法综述", 《电测与仪表》 * |
| 王雪 等: "基于自适应负序电压正反馈的孤岛检测方法", 《电力自动化设备》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242815A (en) * | 2018-03-30 | 2018-07-03 | 华北电力科学研究院有限责任公司 | Fall the wind turbine energy storage supplied for power of fan and coordinate frequency modulation system and method |
| CN108242815B (en) * | 2018-03-30 | 2024-03-08 | 华北电力科学研究院有限责任公司 | Fan energy storage coordination frequency modulation system and method for fan power drop complement |
| CN109672207A (en) * | 2018-12-04 | 2019-04-23 | 国网江苏省电力有限公司电力科学研究院 | A kind of back-to-back system (CCC-0) control method and system based on virtual synchronous machine |
| US11777322B2 (en) | 2020-06-03 | 2023-10-03 | Delta Electronics (Shanghai) Co., Ltd | Islanding detection mothod for inverter and apparatus |
| US11936310B2 (en) | 2020-06-03 | 2024-03-19 | Delta Electronics (Shanghai) Co., Ltd | Control method and device for three-phase AC system |
| CN117805541A (en) * | 2024-02-29 | 2024-04-02 | 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 |
| 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 |
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