CN108306283A - The control method and device of micro-grid system - Google Patents
The control method and device of micro-grid system Download PDFInfo
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- CN108306283A CN108306283A CN201711484799.6A CN201711484799A CN108306283A CN 108306283 A CN108306283 A CN 108306283A CN 201711484799 A CN201711484799 A CN 201711484799A CN 108306283 A CN108306283 A CN 108306283A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000001052 transient effect Effects 0.000 claims description 24
- 230000005611 electricity Effects 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 9
- 238000004146 energy storage Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000007665 sagging Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- 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
-
- H02J3/382—
-
- 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)
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Abstract
The invention discloses a kind of control method of micro-grid system and devices.Wherein, this method includes：It is actively injected after uncharacteristic harmonics into micro-grid system, detects the impedance operator data of micro-grid system；Judge the micro-grid system for grid-connected operating mode or isolated island operating mode according to the impedance operator data；In the case where it is the isolated island operating mode to judge the micro-grid system, the control parameter of micro-capacitance sensor current transformer in micro-grid system is adjusted.The present invention solves the unstable technical problem that isolated island detection leads to micro-capacitance sensor.
Description
Technical field
The present invention relates to power domains, in particular to the control method and device of a kind of micro-grid system.
Background technology
Traditional gird-connected inverter isolated island detection is all based on for the judgement of energy-storage system state-detection both at home and abroad at present
Method is unfolded.Typical island detection method has intentional frequency offset technology based on positive feedback, negative sequence voltage positive feedback
Technology etc., such method are the island detection methods for separate unit gird-connected inverter, and for more micro-capacitance sensor unsteady flows in parallel
It is then not suitable for for the micro-grid system of device composition, and such method is to realize micro-grid system voltage by positive feedback etc.
It is abnormal to carry out isolated island detection, be unfavorable for micro-grid system it is grid-connected/stabilization of isolated island operating mode.
For above-mentioned problem, currently no effective solution has been proposed.
Invention content
An embodiment of the present invention provides a kind of control method of micro-grid system and devices, are led at least solving isolated island detection
Cause the unstable technical problem of micro-capacitance sensor.
One side according to the ... of the embodiment of the present invention provides a kind of control method of micro-grid system, including：Xiang Wei electricity
It is actively injected after uncharacteristic harmonics in net system, detects the impedance operator data of micro-grid system；According to the impedance operator
Data judge the micro-grid system for grid-connected operating mode or isolated island operating mode；Judging that the micro-grid system is the isolated island
In the case of operating mode, the control parameter of micro-capacitance sensor current transformer in micro-grid system is adjusted.
Further, it is actively injected after uncharacteristic harmonics into micro-grid system, the impedance for detecting micro-grid system is special
Property data include：After injecting the uncharacteristic harmonics, the electricity of the uncharacteristic harmonics is extracted from the micro-grid system
Press component and current component；The impedance operator number of the micro-grid system is determined according to the component of voltage and the current component
According to.
Further, after injecting the uncharacteristic harmonics, it is humorous that the non-feature is extracted from the micro-grid system
The component of voltage and current component of wave include：The uncharacteristic harmonics are extracted from the micro-grid system using complex filter
Component of voltage and current component.
Further, uncharacteristic harmonics are actively injected into the micro-grid system includes：Periodically to the micro-capacitance sensor
Uncharacteristic harmonics are actively injected in system.
Further, judge the micro-grid system for grid-connected operating mode or isolated island operating mode according to the impedance operator data
Including：Detect transient data when injecting the uncharacteristic harmonics in the impedance operator data；Judging the transient data is
It is no to be less than or equal to threshold value；When the transient data is more than the threshold value, determine that the micro-grid system is isolated island operating mode；
When the transient data is less than or equal to the threshold value, determine that the micro-grid system is grid-connected operating mode.
Another aspect according to the ... of the embodiment of the present invention additionally provides a kind of control device of micro-grid system, including：Detection
Unit, the impedance operator data for after actively injecting uncharacteristic harmonics into micro-grid system, detecting micro-grid system；
Judging unit, for judging the micro-grid system for grid-connected operating mode or isolated island operating mode according to the impedance operator data；It adjusts
Unit is saved, in the case where it is the isolated island operating mode to judge the micro-grid system, adjusting micro- electricity in micro-grid system
The control parameter of net current transformer.
Further, the detection unit includes：Extraction module is used for after injecting the uncharacteristic harmonics, from institute
State the component of voltage and current component that the uncharacteristic harmonics are extracted in micro-grid system；First determining module, for according to institute
It states component of voltage and the current component determines the impedance operator data of the micro-grid system.
Further, it is humorous using complex filter to extract the non-feature from the micro-grid system for the extraction module
The component of voltage and current component of wave.
Further, the detection unit includes：Injection module is actively noted for periodicity into the micro-grid system
Enter uncharacteristic harmonics.
Further, the judging unit includes：Detection module, for detecting in the impedance operator data described in injection
Transient data when uncharacteristic harmonics；Judgment module, for judging whether the transient data is less than or equal to threshold value；Second
Determining module, for when the transient data is more than the threshold value, determining that the micro-grid system is isolated island operating mode；Third is true
Cover half block, for when the transient data is less than or equal to the threshold value, determining that the micro-grid system is grid-connected operating mode.
Then the present embodiment detects micro-grid system and injects uncharacteristic harmonics by injecting uncharacteristic harmonics into micro-capacitance sensor
Impedance operator data afterwards can improve micro-capacitance sensor to judge that micro-grid system is grid-connected operating mode or isolated island operating mode
Output performance improves power quality, solves the poor technical problem of the output performance of micro-capacitance sensor in the prior art.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the control method of micro-grid system according to the ... of the embodiment of the present invention；
Fig. 2 is the schematic diagram according to the ... of the embodiment of the present invention that uncharacteristic harmonics are injected to power grid；
Fig. 3 is the schematic diagram of complex filter according to the ... of the embodiment of the present invention；
Fig. 4 is the current harmonics component and voltage harmonic point of power grid after injection uncharacteristic harmonics according to the ... of the embodiment of the present invention
The oscillogram of amount；
Fig. 5 be it is according to the ... of the embodiment of the present invention injection uncharacteristic harmonics after power grid impedance data oscillogram；
Fig. 6 is the schematic diagram of the control device of micro-grid system according to the ... of the embodiment of the present invention.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that using in this way
Data can be interchanged in the appropriate case, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
It includes to be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment to cover non-exclusive
Those of clearly list step or unit, but may include not listing clearly or for these processes, method, product
Or the other steps or unit that equipment is intrinsic.
According to embodiments of the present invention, a kind of embodiment of the method for the control method of micro-grid system is provided, needs to illustrate
, step shown in the flowchart of the accompanying drawings can hold in the computer system of such as a group of computer-executable instructions
Row, although also, logical order is shown in flow charts, and it in some cases, can be with different from sequence herein
Execute shown or described step.
Fig. 1 is the flow chart of the control method of micro-grid system according to the ... of the embodiment of the present invention, as shown in Figure 1, this method
Include the following steps：
Step S102, actively injects after uncharacteristic harmonics into micro-grid system, and the impedance for detecting micro-grid system is special
Property data；
Step S104 judges micro-grid system for grid-connected operating mode or isolated island operating mode according to impedance operator data；
Step S106 adjusts micro-capacitance sensor in micro-grid system in the case where it is isolated island operating mode to judge micro-grid system
The control parameter of current transformer.
Then the present embodiment detects micro-grid system and injects uncharacteristic harmonics by injecting uncharacteristic harmonics into micro-capacitance sensor
Impedance operator data afterwards can improve micro-capacitance sensor to judge that micro-grid system is grid-connected operating mode or isolated island operating mode
Output performance improves power quality, solves the poor technical problem of the output performance of micro-capacitance sensor in the prior art.
Specifically, micro-capacitance sensor is controlled using sagging three close-loop control mode based on rotating coordinate system.When being incorporated into the power networks,
Distributed generation resource detects capacitance voltage Uabc and output current Iabc and calculates active power of output P and reactive power Q, and with it is given
P* and Q* is instructed by translating droop control curve, to obtain capacitance voltage reference value Udq* more afterwards；It is distributed when islet operation
Power supply obtains capacitance voltage reference value Udq* according to active power of output P and reactive power Q according to predetermined sagging curve；Udq* with
Capacitance voltage detected value Udq obtains current-order reference value idq* by ratio resonance potential adjuster more afterwards；Idq* and change
Stream device bridge arm current detected value idq obtains output voltage command value and through ovennodulation by ratio resonance current adjuster more afterwards
Algorithm generates pwm signal control microgrid current transformer operation.
In the present embodiment, distributed generation resource can be divided into two classes in active microgrid, and one kind is that conventional photovoltaic, wind-powered electricity generation etc. can be again
The raw energy, runs on maximal power tracing state, invertor operation is in current source output mode；One kind is the energy storage such as accumulator
System exports corresponding active and reactive power under simultaneously net state according to higher level's dispatch command, is system in isolated island operating mode
Interior load provides voltage and frequency is supported, can be incorporated into the power networks and be controlled in V/f in current source output mode, islet operation as needed
System or droop control pattern or grid-connected and isolated island run on droop control pattern.This section introduces the energy-storage systems such as accumulator
Micro- source is in current source output mode and the mutual switching method of voltage source output mode.
When energy accumulation current converter is incorporated into the power networks, micro-capacitance sensor current transformer is defeated by the way of Direct Current Control according to superior instructions
Go out corresponding active and reactive current, transformation angle is using the line voltage angle obtained measured by phaselocked loop；
When micro-capacitance sensor current transformer islet operation, the instruction that micro-capacitance sensor current transformer current closed-loop is adjusted is what voltage close loop was adjusted
Output, transformation angle is using angle caused by droop control.
Voltage source mode based on droop control can be incorporated into the power networks, also can islet operation, therefore above-mentioned grid-connected current source and
Voltage source mode of the isolated island based on droop control switches there are two different modes, current source mode and based on droop control
Voltage source mode can mutually switch when distributed generation resource is incorporated into the power networks, also can be after distributed generator islanding by current source mould
Formula is switched to voltage source mode.
It is in grid-connected operating mode or isolated island operating mode in order to detect micro-capacitance sensor, uncharacteristic harmonics can be injected into micro-capacitance sensor,
The impedance operator data that uncharacteristic harmonics measure later are injected according to micro-capacitance sensor to judge that micro-capacitance sensor is in grid-connected operating mode still
Isolated island operating mode.
That is, the impedance operator data of detection micro-grid system include：After injecting uncharacteristic harmonics, from micro-grid system
The component of voltage and current component of middle extraction uncharacteristic harmonics；The resistance of micro-grid system is determined according to component of voltage and current component
Anti- performance data.
Optionally, after injecting uncharacteristic harmonics, from micro-grid system extract uncharacteristic harmonics component of voltage and
Current component includes：The component of voltage and current component of uncharacteristic harmonics are extracted from micro-grid system using complex filter.
As shown in Fig. 2, micro-capacitance sensor current transformer injects non-harmonics to power grid, micro-capacitance sensor current transformer is using shown in Fig. 3
Complex filter detection port voltage and electric current in correspond to harmonic content Vg (hx), electric network impedance can be calculated in Ig (hx)
Rg(hx)、Xg(hx)。
Fig. 4, which show actively to inject, utilizes power grid electricity measured in the complex filter of Fig. 3 after uncharacteristic harmonics
Pressure and current harmonics component, Fig. 5 show the electricity that the voltage and current harmonic component measured by complex filter is calculated
(the actual electric network impedance of net impedance value：Resistance Rg=0.8 Ω, inductance Lg sport 1.2mH by 500uH).As can be seen from Figure 5
Extraction to voltage and current harmonic component can accurately be realized using complex filter, electric network impedance can be accurately measured,
The judgement to micro-grid system and off-network state may be implemented according to the variation of electric network impedance measured value, there is faster dynamic to ring
It answers.
Following formula computing impedance performance data Z may be used in the present embodiment:
Z=Rg+jwLg, wherein Rg is the resistance of micro-capacitance sensor, and Lg is the inductance of micro-capacitance sensor, and w is that the non-feature of injection is humorous
Wave.
Due to the injection of uncharacteristic harmonics so that grid-connected current produces disturbance, in order to avoid the disturbance production of addition harmonic wave
Therefore harmful effect of the raw harmonic pollution to power grid quality periodically actively injects uncharacteristic harmonics into micro-grid system, with
Reduce the influence to power grid quality.
Optionally, judge that micro-grid system includes for grid-connected operating mode or isolated island operating mode according to impedance operator data：Detection
Transient data when uncharacteristic harmonics is injected in impedance operator data；Judge whether transient data is less than or equal to threshold value；
When transient data is more than threshold value, determine that micro-grid system is isolated island operating mode；When transient data is less than or equal to threshold value, determine micro-
Network system is grid-connected operating mode.
Abrupt transients are will produce when injecting uncharacteristic harmonics to power grid, can be judged according to accidental data when being mutated
Micro-grid system is grid-connected operating mode or isolated island operating mode, to be further adjusted to the control data of micro-capacitance sensor.
The embodiment of the present invention additionally provides a kind of control device of micro-grid system.Fig. 6 is according to the ... of the embodiment of the present invention
The flow chart of the control device of micro-grid system.As shown in fig. 6, the control device of the micro-grid system includes：Detection unit 10,
Judging unit 20 and adjusting unit 30.
Detection unit 10 is used for after actively injecting uncharacteristic harmonics into micro-grid system, detects micro-grid system
Impedance operator data；
Judging unit 20 is used to judge the micro-grid system for grid-connected operating mode or orphan according to the impedance operator data
Island operating mode；
Unit 30 is adjusted to be used to, in the case where it is the isolated island operating mode to judge the micro-grid system, adjust micro-capacitance sensor
The control parameter of micro-capacitance sensor current transformer in system.
Then the present embodiment detects micro-grid system and injects uncharacteristic harmonics by injecting uncharacteristic harmonics into micro-capacitance sensor
Impedance operator data afterwards can improve micro-capacitance sensor to judge that micro-grid system is grid-connected operating mode or isolated island operating mode
Output performance improves power quality, solves the poor technical problem of the output performance of micro-capacitance sensor in the prior art.
Specifically, micro-capacitance sensor is controlled using sagging three close-loop control mode based on rotating coordinate system.When being incorporated into the power networks,
Distributed generation resource detects capacitance voltage Uabc and output current Iabc and calculates active power of output P and reactive power Q, and with it is given
P* and Q* is instructed by translating droop control curve, to obtain capacitance voltage reference value Udq* more afterwards；It is distributed when islet operation
Power supply obtains capacitance voltage reference value Udq* according to active power of output P and reactive power Q according to predetermined sagging curve；Udq* with
Capacitance voltage detected value Udq obtains current-order reference value idq* by ratio resonance potential adjuster more afterwards；Idq* and change
Stream device bridge arm current detected value idq obtains output voltage command value and through ovennodulation by ratio resonance current adjuster more afterwards
Algorithm generates pwm signal control microgrid current transformer operation.
In the present embodiment, distributed generation resource can be divided into two classes in active microgrid, and one kind is that conventional photovoltaic, wind-powered electricity generation etc. can be again
The raw energy, runs on maximal power tracing state, invertor operation is in current source output mode；One kind is the energy storage such as accumulator
System exports corresponding active and reactive power under simultaneously net state according to higher level's dispatch command, is system in isolated island operating mode
Interior load provides voltage and frequency is supported, can be incorporated into the power networks and be controlled in V/f in current source output mode, islet operation as needed
System or droop control pattern or grid-connected and isolated island run on droop control pattern.This section introduces the energy-storage systems such as accumulator
Micro- source is in current source output mode and the mutual switching method of voltage source output mode.
When energy accumulation current converter is incorporated into the power networks, micro-capacitance sensor current transformer is defeated by the way of Direct Current Control according to superior instructions
Go out corresponding active and reactive current, transformation angle is using the line voltage angle obtained measured by phaselocked loop；
When micro-capacitance sensor current transformer islet operation, the instruction that micro-capacitance sensor current transformer current closed-loop is adjusted is what voltage close loop was adjusted
Output, transformation angle is using angle caused by droop control.
Voltage source mode based on droop control can be incorporated into the power networks, also can islet operation, therefore above-mentioned grid-connected current source and
Voltage source mode of the isolated island based on droop control switches there are two different modes, current source mode and based on droop control
Voltage source mode can mutually switch when distributed generation resource is incorporated into the power networks, also can be after distributed generator islanding by current source mould
Formula is switched to voltage source mode.
It is in grid-connected operating mode or isolated island operating mode in order to detect micro-capacitance sensor, uncharacteristic harmonics can be injected into micro-capacitance sensor,
The impedance operator data that uncharacteristic harmonics measure later are injected according to micro-capacitance sensor to judge that micro-capacitance sensor is in grid-connected operating mode still
Isolated island operating mode.
Optionally, the detection unit includes：Extraction module, for after injecting the uncharacteristic harmonics, from described
The component of voltage and current component of the uncharacteristic harmonics are extracted in micro-grid system；First determining module, for according to
Component of voltage and the current component determine the impedance operator data of the micro-grid system.
Optionally, the extraction module extracts the uncharacteristic harmonics using complex filter from the micro-grid system
Component of voltage and current component.
As shown in Fig. 2, micro-capacitance sensor current transformer injects non-harmonics to power grid, micro-capacitance sensor current transformer is using shown in Fig. 3
Complex filter detection port voltage and electric current in correspond to harmonic content Vg (hx), electric network impedance can be calculated in Ig (hx)
Rg(hx)、Xg(hx)。
Fig. 4, which show actively to inject, utilizes power grid electricity measured in the complex filter of Fig. 3 after uncharacteristic harmonics
Pressure and current harmonics component, Fig. 5 show the electricity that the voltage and current harmonic component measured by complex filter is calculated
(the actual electric network impedance of net impedance value：Resistance Rg=0.8 Ω, inductance Lg sport 1.2mH by 500uH).As can be seen from Figure 5
Extraction to voltage and current harmonic component can accurately be realized using complex filter, electric network impedance can be accurately measured,
The judgement to micro-grid system and off-network state may be implemented according to the variation of electric network impedance measured value, there is faster dynamic to ring
It answers.
Following formula computing impedance performance data Z may be used in the present embodiment:
Z=Rg+jwLg, wherein Rg is the resistance of micro-capacitance sensor, and Lg is the inductance of micro-capacitance sensor, and w is that the non-feature of injection is humorous
Wave.
Due to the injection of uncharacteristic harmonics so that grid-connected current produces disturbance, in order to avoid the disturbance production of addition harmonic wave
Harmful effect of the raw harmonic pollution to power grid quality, therefore, the detection unit includes：Injection module, for periodically to institute
It states and actively injects uncharacteristic harmonics in micro-grid system.
Optionally, the judging unit includes：Detection module, for detect injected in the impedance operator data it is described non-
Transient data when characteristic harmonics；Judgment module, for judging whether the transient data is less than or equal to threshold value；Second really
Cover half block, for when the transient data is more than the threshold value, determining that the micro-grid system is isolated island operating mode；Third determines
Module, for when the transient data is less than or equal to the threshold value, determining that the micro-grid system is grid-connected operating mode.
Abrupt transients are will produce when injecting uncharacteristic harmonics to power grid, can be judged according to accidental data when being mutated
Micro-grid system is grid-connected operating mode or isolated island operating mode, to be further adjusted to the control data of micro-capacitance sensor.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, for example, the unit division, Ke Yiwei
A kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
It connects, can be electrical or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
On unit.Some or all of unit therein can be selected according to the actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes：USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can to store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of control method of micro-grid system, which is characterized in that including：
It is actively injected after uncharacteristic harmonics into micro-grid system, detects the impedance operator data of micro-grid system；
Judge the micro-grid system for grid-connected operating mode or isolated island operating mode according to the impedance operator data；
In the case where it is the grid-connected operating mode to judge the micro-grid system, micro-capacitance sensor current transformer in micro-grid system is adjusted
Control parameter.
2. according to the method described in claim 1, it is characterized in that, actively injected into micro-grid system uncharacteristic harmonics it
Afterwards, the impedance operator data for detecting micro-grid system include：
After injecting the uncharacteristic harmonics, extracted from the micro-grid system uncharacteristic harmonics component of voltage and
Current component；
The impedance operator data of the micro-grid system are determined according to the component of voltage and the current component.
3. according to the method described in claim 2, it is characterized in that, after injecting the uncharacteristic harmonics, from micro- electricity
The component of voltage and current component that the uncharacteristic harmonics are extracted in net system include：
The component of voltage and current component of the uncharacteristic harmonics are extracted from the micro-grid system using complex filter.
4. according to the method described in claim 1, it is characterized in that, actively injecting uncharacteristic harmonics into the micro-grid system
Including：
Periodically uncharacteristic harmonics are actively injected into the micro-grid system.
5. according to the method described in claim 1, it is characterized in that, judging the micro-capacitance sensor system according to the impedance operator data
System is grid-connected operating mode or isolated island operating mode includes：
Detect transient data when injecting the uncharacteristic harmonics in the impedance operator data；
Judge whether the transient data is less than or equal to threshold value；
When the transient data is more than the threshold value, determine that the micro-grid system is isolated island operating mode；
When the transient data is less than or equal to the threshold value, determine that the micro-grid system is grid-connected operating mode.
6. a kind of control device of micro-grid system, which is characterized in that including：
Detection unit, the impedance for after actively injecting uncharacteristic harmonics into micro-grid system, detecting micro-grid system
Performance data；
Judging unit, for judging the micro-grid system for grid-connected operating mode or isolated island work according to the impedance operator data
Condition；
Unit is adjusted, in the case where it is the grid-connected operating mode to judge the micro-grid system, adjusting micro-grid system
The control parameter of interior micro-capacitance sensor current transformer.
7. device according to claim 6, which is characterized in that the detection unit includes：
Extraction module, for after injecting the uncharacteristic harmonics, it is humorous that the non-feature to be extracted from the micro-grid system
The component of voltage and current component of wave；
First determining module, the impedance for determining the micro-grid system according to the component of voltage and the current component are special
Property data.
8. device according to claim 7, which is characterized in that the extraction module utilizes complex filter from micro- electricity
The component of voltage and current component of the uncharacteristic harmonics are extracted in net system.
9. device according to claim 6, which is characterized in that the detection unit includes：
Injection module actively injects uncharacteristic harmonics for periodicity into the micro-grid system.
10. device according to claim 6, which is characterized in that the judging unit includes：
Detection module injects the transient data when uncharacteristic harmonics for detecting in the impedance operator data；
Judgment module, for judging whether the transient data is less than or equal to threshold value；
Second determining module, for when the transient data is more than the threshold value, determining that the micro-grid system is isolated island work
Condition；
Third determining module, for when the transient data is less than or equal to the threshold value, determining the micro-grid system
For grid-connected operating mode.
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