CN103997042B - Voltage adjusting method, inverter and micro-grid system - Google Patents
Voltage adjusting method, inverter and micro-grid system Download PDFInfo
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- CN103997042B CN103997042B CN201410206919.6A CN201410206919A CN103997042B CN 103997042 B CN103997042 B CN 103997042B CN 201410206919 A CN201410206919 A CN 201410206919A CN 103997042 B CN103997042 B CN 103997042B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention provides a kind of voltage adjusting method, for regulating predetermined in micro-grid system and the voltage of site, described method includes: detect the predetermined and voltage magnitude of site and frequency；Calculating predetermined and site at the voltage amplitude value difference in predetermined detection time and current detection moment and difference on the frequency, determine that the predetermined and wattful power rate variance of site and reactive power are poor, the default detection time is poor early than the scheduled time in current detection moment one；Predetermined and the first active power of site and the first reactive power is determined according to the voltage magnitude detected in the current detection moment and frequency；The second active power and the second reactive power is determined according to the first active power, the first reactive power, wattful power rate variance and reactive power difference；Output determines active power and determines reactive power, determines that active power is equal to the second active power, determines that reactive power is equal to the second reactive power.Present invention achieves the purpose of the predetermined also site of regulation.Present invention also offers a kind of inverter and a kind of micro-grid system.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of micro-grid system and inverter thereof.
Background technology
Owing to distributed generation system the most still regenerative resource accesses the important tie of electrical network, and can also be
Improve the stability of tradition electrical network to a certain extent, obtain increasing attention in recent years.Due to wind energy,
The regenerative resources such as solar energy have the feature of intermittence, randomness, are typical uncontrollable sources, the most micro-
Electrical network arises at the historic moment.Micro-capacitance sensor is as a kind of multiple renewable energy sources, energy storage device and load of being integrated with
Local power system, has obtained studying widely in recent years.In micro-grid system, various micro battery (can
The renewable sources of energy etc.) it is generally required to by combining inverter incoming transport electrical network.Current grid-connected inverters mainly divides
For both of which.One is voltage source mode, and another kind is current source mode.For a micro-grid system
For Laiing, the voltage of this micro-grid system of inverter control of a voltage source mode and frequency, current source mould
The power of this micro-grid system of inverter control of formula, to guarantee the properly functioning of micro-grid system.But,
Along with micro battery is the longest apart from a certain and site radius of electricity supply, cause the radius of electricity supply drop of pressure that powers on the biggest,
The power being simultaneously fed into the load of this and site is the fewest, so that supply is described and the voltage of site and input
The parameters such as power are the lowest, cause and cannot guarantee the properly functioning of this and site load.
Summary of the invention
A kind of voltage adjusting method, inverter and micro-grid system are provided, to regulate and the voltage of site, from
And guarantee that the load of this and site can be properly functioning.
First aspect, it is provided that a kind of voltage adjusting method, is applied in the inverter of micro-grid system, with
Predetermined and the voltage of site in regulation micro-grid system, described voltage adjusting method includes:
Detect the described predetermined and voltage magnitude of site and frequency；
Calculate described predetermined and site in default detection time and the voltage amplitude value difference in current detection moment and frequency
Difference, and determine the described predetermined and wattful power rate variance of site and nothing according to described voltage amplitude value difference and difference on the frequency
Merit difference power；Wherein, the described default detection time is poor early than the described scheduled time in current detection moment one；
The predetermined grid-connected point voltage amplitude detected according to the current detection moment and frequency determine described predetermined grid-connected
Point is in first active power in described current detection moment and the first reactive power；
Is determined according to described first active power, the first reactive power, wattful power rate variance and reactive power
Two active power and the second reactive power；
Output determines active power and determines that reactive power, to the most described predetermined and site, wherein, described determines have
Merit power is equal to described second active power, described determines that reactive power is equal to described second reactive power.
In the first possible implementation of first aspect, according to the current detection moment detect predetermined
Grid-connected point voltage amplitude and frequency determine that described predetermined also site is at first wattful power in described current detection moment
Rate and the first reactive power include:
The voltage magnitude detected according to the current detection moment and the micro battery of micro-grid system make a reservation for also to described
Between site, the resistance in circuit and reactance determine virtual impedance, to compensate the reactance in described circuit；
Determine and carry out the voltage magnitude after reactance compensation and frequency in circuit；
Determine that described predetermined and site is in the of the described current detection moment according to the voltage magnitude determined and frequency
One active power and the first reactive power.
In the implementation that the second of first aspect is possible, output determines active power and determines idle merit
Rate includes to described predetermined and site:
Instruction is sent according to described second active power and described second reactive power；
Determine active power according to described instruction output is described and determines reactive power.
In the third possible implementation of first aspect, or be combined in first aspect the first or
Two kinds of possible implementations, in the implementation that the third is possible, described wattful power rate variance is described frequency
First constant times of rate variance, described reactive power difference is the second constant times of described voltage amplitude value difference.
Second aspect, it is provided that a kind of inverter, is applied in micro-grid system, is used for regulating micro-grid system
In the predetermined and voltage of site, described inverter includes:
Detector unit, described testing circuit is connected to described predetermined and site, to detect described predetermined and site
Voltage magnitude and frequency；
Droop control unit, described droop control unit connects described detector unit, to calculate described making a reservation for also
Site is at default detection time and the voltage amplitude value difference in current detection moment and difference on the frequency, and according to described voltage
Difference in magnitude and difference on the frequency determine that the described predetermined and wattful power rate variance of site and reactive power are poor；Wherein, institute
State the default detection time poor early than the described scheduled time in current detection moment one；
Gradient control unit, described gradient control unit connects described detector unit, according to the current detection moment
The grid-connected point voltage amplitude detected and frequency determine that described predetermined and site is in the of the described current detection moment
One active power and the first reactive power；
Coordinating control unit, described coordination control unit is connected to described droop control unit and described gradient control
Unit processed, and come according to described first active power, the first reactive power, wattful power rate variance and reactive power
Determine the second active power and the second reactive power；And
Inverter unit, described inverter unit is connected to coordinate control unit, receives described second and gains merit
Power and described second reactive power, thus output determines active power and determines that reactive power is to described predetermined
And site, wherein, described determine that active power is equal to described second active power, described determine reactive power
Equal to described second reactive power.
In the first possible implementation of second aspect, described gradient control unit includes:
Virtual impedance subelement, described virtual impedance subelement is connected to described detector unit, with according to current
Line between voltage magnitude and the most described predetermined also site of the micro battery of micro-grid system that the detection moment detects
Resistance and reactance in road determine virtual impedance, to compensate the reactance in described circuit；
Determine subelement, carry out the voltage magnitude after reactance compensation and frequency in circuit for determining；
Gradient controls subelement, and described gradient controls subelement and is connected to described determine subelement, to receive really
Fixed voltage magnitude and frequency, and determine that described predetermined also site is in institute according to the voltage magnitude determined and frequency
State the first active power and first reactive power in current detection moment.
In the implementation that the second of second aspect is possible, described inverter unit includes:
Controlling subelement, described control subelement is connected to described coordination control unit, to receive described second
Active power and described second reactive power, and according to described second active power and described second reactive power
Send instruction；
Driving and inversion subelement, described inversion subelement is connected to described control subelement and makes a reservation for also with described
Between site, to determine active power and determine reactive power according to described instruction output, wherein, described really
Determine active power having equal to described second active power, determine that reactive power is equal to described second reactive power.
In the third possible implementation of second aspect, described wattful power rate variance is described difference on the frequency
First constant times, described reactive power difference is second constant coefficient times of described voltage amplitude value difference.
The third aspect, it is provided that a kind of micro-grid system, including micro battery, the first predetermined and site and above-mentioned respectively
Planting a kind of described inverter in possible implementation, described micro battery is connected to described first and makes a reservation for also
Site, think described first and site power, described inverter connects the described first predetermined and site, to adjust
Save the described first predetermined and voltage of site.
The voltage adjusting method provided according to various implementations, this voltage adjusting method is applied to micro-capacitance sensor system
In the inverter of system, to regulate predetermined in micro-grid system and the voltage of site, described voltage adjusting method is examined
Survey the described predetermined and voltage magnitude of site and frequency；Calculate described predetermined and site in the default detection time and
The voltage amplitude value difference in current detection moment and difference on the frequency, and determine according to described voltage amplitude value difference and difference on the frequency
Wattful power rate variance and the reactive power of described predetermined also site are poor；Wherein, the described default detection time is early than institute
State the scheduled time in current detection moment one poor；The voltage magnitude and the frequency that detect according to the current detection moment are true
Fixed the most described predetermined and site is in first active power in current detection moment and the first reactive power；According to described
First active power, the first reactive power, wattful power rate variance and reactive power determine the second active power and
Second reactive power；Output determines active power and determines that reactive power makes a reservation for and site to described, wherein,
Described determine that active power is equal to described second active power, described determine that reactive power is equal to described second nothing
Merit power.Due to output to the described predetermined and voltage of site and the described predetermined and wattful power of site of output
Rate is corresponding with reactive power, i.e. when output to the described predetermined and active power of site and reactive power difference,
Then described and site voltage changes therewith, therefore present invention achieves the voltage of the described predetermined also site of regulation
Purpose.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, describe below
In accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not paying
On the premise of going out creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of a kind of voltage adjusting method that first aspect of the present invention better embodiment provides；
Fig. 2 is the flow chart of the step 103 in Fig. 1；
Fig. 3 is the flow chart of the step 105 in Fig. 1；
Fig. 4 is the block diagram of a kind of inverter that second aspect of the present invention better embodiment provides；
Fig. 5 is the block diagram of the gradient control unit in Fig. 4；
Fig. 6 is the block diagram of the inverter unit in Fig. 4；
Fig. 7 is the block diagram of the micro-capacitance sensor that third aspect of the present invention better embodiment provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, be fully described by, it is clear that described embodiment be only a part of embodiment of the present invention rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
Referring to Fig. 1, first aspect of the present invention better embodiment provides a kind of voltage adjusting method.Described electricity
Pressure control method is applied in the inverter of micro-grid system, predetermined and site to regulate in micro-grid system
Voltage.Described voltage adjusting method includes step.
Step 101, the voltage magnitude detecting described predetermined also site and frequency.
Wherein, in micro-grid system, described micro-grid system includes micro battery and by connection to micro-
The also site of power supply.The radius of electricity supply of micro battery distance site is the longest at any time, causes voltage in radius of electricity supply
Land the biggest, be simultaneously fed into that to be connected to power of this and site load the fewest, so that supply described grid-connected
The parameters such as the voltage of point and the power of input are the lowest, properly functioning cannot ensure the load of this and site.Cause
This can select such and site as predetermined and site.In the present embodiment, described making a reservation for also is detected
The voltage magnitude of site and frequency are voltage magnitude and the frequencies of the described predetermined also site of detection in real time.
Step 102, calculate described predetermined and site at default detection time and the voltage magnitude in current detection moment
Difference and difference on the frequency, and determine described predetermined and the wattful power of site according to described voltage amplitude value difference and difference on the frequency
Rate variance and reactive power are poor.Wherein, the described default detection time is early than described current detection moment one pre-timing
Between poor.
It should be noted that difference of the described scheduled time can be set, according to actual needs such as half point
Clock or one minute etc..The described current detection moment is the moment of this detection current.During described default detection
Between can be time of last detection, time phase difference institute of the time of last detection and this detection current
State the scheduled time poor.Wherein, when the default detection time, calculated voltage is entered as | U2|, calculate
To frequency be f1.In the current detection moment, calculated voltage magnitude is | U2|, calculated frequency
For f2.Therefore, the voltage amplitude value difference in default detection time and current detection moment be △ | U |=| U2|-|U2|；?
The difference power presetting detection time and current detection moment is △ f=f2-f1.And wattful power rate variance and difference power
Relation is △ P=KP× △ f, KPFor constant coefficient；Reactive power difference with the relation of voltage amplitude value difference is
△ Q=KQ× △ | U |, KQFor constant coefficient.Therefore, it can according to described voltage amplitude value difference and difference on the frequency permissible
Determine that the described predetermined and wattful power rate variance of site and reactive power are poor.
Step 103, the predetermined grid-connected point voltage amplitude detected according to the current detection moment and frequency determine described
Predetermined and site is in first active power in described current detection moment and the first reactive power.
Wherein, in the gradient control unit of inverter, storage has gradient function, in gradient function, and voltage amplitude
Value and frequency are that the variable in described gradient function, active power and reactive power are as function.Wherein, one
Individual voltage magnitude and frequency corresponding uniquely active power and reactive power.Therefore, it can by getting
Voltage magnitude and frequency bring in gradient function, i.e. available corresponding active power and reactive power.
If it should be noted that impedance meeting circuit from described micro battery to described predetermined and site
When having a strong impact on the output of described micro battery to the described predetermined and active power of site and reactive power, Ke Yitong
Cross the line build-out that carries out taking virtual impedance technical equivalences, thus reduce the impedance of circuit to described pre-as far as possible
The active power of fixed also site and the impact of reactive power.Then it is in particular:
Please continue to refer to Fig. 2, step 103 can comprise the following steps.
The micro battery of step 1031, the voltage magnitude detected according to the current detection moment and micro-grid system is to institute
Resistance and the reactance stated between predetermined and site in circuit determine virtual impedance, with to the reactance in described circuit
Compensate.
Specifically, equivalence can increase in inverter control loop according to the resistance in described circuit and reactance
One virtual impedance, thus change the impedance conditions of the circuit between the most described predetermined also site of current micro battery,
Realize line build-out, thus reduce the impedance of circuit to the described predetermined and active power of site and idle as far as possible
The impact of power.
Electricity in step 1032, the voltage magnitude detected according to the current detection moment, frequency, described circuit
Reactance after resistance and compensation determines the voltage magnitude after described reactance compensation and frequency.
It should be noted that after reactance carries out supplementing in circuit, described voltage magnitude and frequency can occur
Change.Resistance in the voltage magnitude that can detect according to the current detection moment, frequency, described circuit and
Reactance after compensation determines the voltage magnitude after described reactance compensation and frequency.
Step 1033, determine that according to the voltage magnitude determined and frequency described predetermined and site is in described current inspection
Survey the first active power and first reactive power in moment.
Step 104, according to described first active power, the first reactive power, wattful power rate variance and reactive power
Determine the second active power and the second reactive power；
Specifically, described first active power is P1.Described first reactive power is Q1.Described second wattful power
Rate is P2.Described second reactive power is Q2.Wherein, P2=k1P1+k2△ P, Q2=t1Q1+t2△ Q, k1、k2、
t1And t2Weight coefficient, described weight coefficient can be adjusted according to applying needs.
Step 105, output determine active power and determine that reactive power is to described predetermined and site, wherein, institute
Stating and determine that active power is equal to described second active power, described to determine that reactive power is equal to described second idle
Power.
It should be noted that owing to output makes a reservation for grid-connected to described predetermined and the voltage of site with the described of output
The active power of point is corresponding with reactive power, i.e. described determine active power and described determines idle merit when exporting
When rate is to the most described predetermined and site, this moment, described predetermined and site voltage must be with described determine meritorious
Power and the described voltage determining that reactive power is corresponding.Therefore, by adjusting the output to described predetermined and site
Active power and reactive power can change the described predetermined and voltage of site.
Please continue to refer to Fig. 3, specifically, described step 105 comprises the following steps:
Step 1051, send instruction according to described second active power and described second reactive power.
Step 1052, determine active power according to instruction output is described and described determines reactive power.Wherein,
Described determine that active power is equal to having of described second active power, determine that reactive power is equal to described second nothing
Merit power.
Wherein, described determine that active power is Pout.Described determine that idle reactive power is Qout.Then Pout=P2；
Qout=Q2.Owing to exporting the most described predetermined and voltage of site and the determination active power of output and the nothing determined
Merit power is corresponding, i.e. determines active power when output is described and described determines that reactive power is to the most described predetermined grid-connected
During point, this moment, described predetermined and site voltage must be to determine active power with described and described determine nothing
The voltage that merit power is corresponding.Therefore, by adjusting the output to the active power of described predetermined and site and idle
Power, can realize regulating the purpose of the described predetermined also voltage of site.
In the present embodiment, described voltage adjusting method is by the voltage magnitude of the described predetermined also site of detection
And frequency；Calculate described predetermined and site default detection time and current detection moment voltage amplitude value difference and
Difference on the frequency, and determine described predetermined and the wattful power rate variance of site according to described voltage amplitude value difference and difference on the frequency
And reactive power is poor；Wherein, the described default detection time is poor early than the described scheduled time in current detection moment one；
The predetermined grid-connected point voltage amplitude detected according to the current detection moment and frequency determine described predetermined and site
First active power and the first reactive power；According to described first active power, the first reactive power, gain merit
Difference power and reactive power determine the second active power and the second reactive power；Output determine active power and
Determine that reactive power, to the most described predetermined and site, wherein, described determines that active power is equal to described second and gains merit
Power, described determines that reactive power is equal to described second reactive power.Owing to output is to described predetermined and site
Voltage corresponding with the determination active power of output and the reactive power determined, i.e. when output described determine meritorious
Power and described when determining reactive power to the most described predetermined and site, this moment, the described predetermined and voltage of site
Must be to determine active power and the described voltage determining that reactive power is corresponding with described.Therefore, by regulation
Output, to the described predetermined and active power of site and reactive power, can realize regulating described predetermined and site
The purpose of voltage.
Referring to Fig. 4, second aspect of the present invention better embodiment provides a kind of inverter 100.Described inversion
Device application, with micro-grid system, makes a reservation in described micro-grid system and the voltage of site for regulating.Described
Inverter includes detector unit 10, droop control unit 20, gradient control unit 30, coordinates control unit
40 and inverter unit 50.
Described detector unit 10 is connected to described predetermined and site, to detect the described predetermined and voltage amplitude of site
Value and frequency.
Wherein, in micro-grid system, described micro-grid system includes micro battery and by connection to micro-
The also site of power supply.The radius of electricity supply of micro battery distance site is the longest at any time, causes voltage in radius of electricity supply
Land the biggest, be simultaneously fed into that to be connected to power of this and site load the fewest, so that supply described grid-connected
The parameters such as the voltage of point and the power of input are the lowest, properly functioning cannot ensure the load of this and site.Cause
This can select such and site as predetermined and site.In the present embodiment, described making a reservation for also is detected
The voltage magnitude of site and frequency are voltage magnitude and the frequencies of the described predetermined also site of detection in real time.
Described droop control unit 20 connects described detector unit 10, to calculate described predetermined also site default
The voltage amplitude value difference in detection time and current detection moment and difference on the frequency, and according to described voltage amplitude value difference and frequency
Rate variance determines that the described predetermined and wattful power rate variance of site and reactive power are poor.Wherein, described default detection
Time is poor early than the described scheduled time in current detection moment one.
It should be noted that difference of the described scheduled time can be set, according to actual needs such as half point
Clock or one minute etc..The described current detection moment can be time during this detection current.Described default inspection
The survey time can be the time of last detection, the time of last detection and the time phase of currently this detection
The difference described scheduled time is poor.Wherein, when the default detection time, described droop control unit 20 is calculated
Voltage be entered as | U2|, calculated frequency is f1.In the current detection moment, described droop control unit
20 calculated voltage magnitudes are | U2|, calculated frequency is f2.Therefore, in the default detection time and
The voltage amplitude value difference in current detection moment be △ | U |=| U2|-|U2|；In default detection time and current detection moment
Difference power is △ f=f2-f1.And the relation of wattful power rate variance and difference power is △ P=KP× △ f, KPFor constant system
Number；Reactive power difference is △ Q=K with the relation of voltage amplitude value differenceQ× △ | U |, KQFor constant coefficient.Therefore,
Described droop control unit 20 can determine described predetermined and site according to described voltage amplitude value difference and difference on the frequency
Wattful power rate variance and reactive power poor.
Described gradient control unit 30 connects described detector unit 10, detects according in the described current detection moment
To predetermined grid-connected point voltage amplitude and frequency determine that described predetermined and site is in the of the described current detection moment
One active power and the first reactive power.
Wherein, in described gradient control unit 30, storage has gradient function.In gradient function, voltage magnitude
And frequency is that the variable in described gradient function, active power and reactive power are as function.Wherein, one
Voltage magnitude and frequency corresponding uniquely active power and reactive power.Therefore, described gradient control unit 30
Can be by the voltage magnitude got and frequency be brought in gradient function, i.e. available corresponding wattful power
Rate and reactive power.
If it should be noted that impedance meeting circuit from described micro battery to described predetermined and site
When having a strong impact on the output of described micro battery to the described predetermined and active power of site and reactive power, Ke Yitong
Cross and take the mode of virtual impedance to carry out line build-out, thus the impedance as far as possible reducing circuit makes a reservation for also described
The active power of site and the impact of reactive power.Then it is in particular:
Please continue to refer to Fig. 5, described gradient control unit 30 includes virtual impedance subelement 31, determines that son is single
Unit 32 and gradient control subelement 33.
Described virtual impedance subelement 31 is connected to described detector unit 10, with according to when described current detection
Carve the voltage magnitude of detection and the micro battery of micro-grid system to make a reservation for and the resistance in circuit between site to described
And reactance determines virtual impedance, compensate with the reactance in described circuit.
Specifically, equivalence can increase in inverter control loop according to the resistance in described circuit and reactance
One virtual impedance, thus change the impedance conditions of the circuit between the most described predetermined also site of current micro battery,
Realize line build-out, thus reduce the impedance of circuit to the described predetermined and active power of site and idle as far as possible
The impact of power.
Described determine subelement 32, be connected to described virtual impedance subelement 31, with according in described current inspection
Reactance after surveying voltage magnitude that the moment detects, frequency, resistance in described circuit and compensating determines described
Voltage magnitude after reactance compensation and frequency.
It should be noted that after reactance carries out supplementing in circuit, described voltage magnitude and frequency can occur
Change.Described determine voltage magnitude that subelement 32 can detect according to the current detection moment, frequency, institute
Reactance after stating the resistance in circuit and compensating determines the voltage magnitude after described reactance compensation and frequency.
Described gradient controls subelement 33 and is connected to described determine subelement 31, with according to the voltage magnitude determined
And frequency determines that described predetermined and site is in first active power in described current detection moment and the first idle merit
Rate.
Described coordination control unit 40 is connected to described droop control unit 20 and described gradient control unit 30,
And determine second according to described first active power, the first reactive power, wattful power rate variance and reactive power
Active power and the second reactive power.
Specifically, described first active power is P1.Described first reactive power is Q1.Described second wattful power
Rate is P2.Described second reactive power is Q2.Wherein, P2=k1P1+k2△ P, Q2=t1Q1+t2△ Q, k1、k2、
t1And t2Weight coefficient, described weight coefficient can be adjusted according to applying needs.
Described inverter unit 50 is connected to coordinate control unit 40, receives described second active power and institute
State the second reactive power, thus output determine active power and determines that reactive power makes a reservation for and site to described,
Wherein, described determining that active power is equal to described second active power, described to determine that reactive power is equal to described
Second reactive power.
It should be noted that owing to output makes a reservation for grid-connected to described predetermined and the voltage of site with the described of output
The active power of point is corresponding with reactive power, i.e. described determine active power and described determines idle merit when exporting
When rate is to the most described predetermined and site, this moment, described predetermined and site voltage must be with described determine meritorious
Power and the described voltage determining that reactive power is corresponding.Therefore, by adjusting the output to described predetermined and site
Active power and reactive power can change the described predetermined and voltage of site.
Please continue to refer to Fig. 6, specifically, described inverter unit 50 include control subelement 51 and drive and
Inversion subelement 52.
Described control subelement 51 is connected to described coordination control unit 40, to receive described second active power
And described second reactive power, and send instruction according to described second active power and described second reactive power.
Described driving and inversion subelement 52 be connected to described control subelement 51 and described predetermined and site it
Between, to determine active power according to described instruction output and to determine reactive power.Wherein, described determine meritorious
Power is equal to described second active power, determines that reactive power is equal to described second reactive power.
Wherein, described determine that active power is Pout.Described determine that idle reactive power is Qout.Then Pout=P2；
Qout=Q2.Owing to exporting the most described predetermined and voltage of site and the determination active power of output and the nothing determined
Merit power is corresponding, i.e. determines active power when output is described and described determines that reactive power is to the most described predetermined grid-connected
During point, this moment, described predetermined and site voltage must be to determine active power with described and described determine nothing
The voltage that merit power is corresponding.Therefore, by adjusting the output to the active power of described predetermined and site and idle
Power, can realize regulating the purpose of the described predetermined also voltage of site.
In the present embodiment, described inverter 100 include detector unit 10, described droop control unit 20,
Described gradient control unit 30, coordination control unit 40 and inverter unit 50.Wherein, described detection electricity
Road 10 is connected to described predetermined and site, to detect the described predetermined and voltage magnitude of site and frequency.Described
Droop control unit 20 connects described detector unit 10, to calculate described predetermined also site in the default detection time
And the voltage amplitude value difference in current detection moment and difference on the frequency, and come really according to described voltage amplitude value difference and difference on the frequency
Wattful power rate variance and the reactive power of fixed described predetermined also site are poor.Described gradient control unit 30 connects described
Detector unit 10, the predetermined grid-connected point voltage amplitude detected according to the current detection moment and frequency determine described
First active power of predetermined also site and the first reactive power.Described coordination control unit 40 is connected to described
Droop control unit 20 and described gradient control unit 30, and according to described first active power, first idle
Power, wattful power rate variance and reactive power determine the second active power and the second reactive power.Described inversion
Device unit 50 is connected to coordinate control unit 40 to receive described second active power and described second idle merit
Rate, thus output determines active power and determine reactive power, wherein, described determines that active power is equal to institute
State having of the second active power, determine that reactive power is equal to described second reactive power.Owing to output is to described
The predetermined also voltage of site is corresponding with the determination active power of output and the reactive power determined, i.e. when output institute
State and determine active power and described when determining reactive power to the most described predetermined and site, this moment, described predetermined also
The voltage of site must be to determine active power and the described voltage determining that reactive power is corresponding with described.Therefore,
By adjusting the output to active power and the reactive power of described predetermined and site, can realize regulating described pre-
The purpose of the fixed also voltage of site.
Referring to Fig. 7, third aspect of the present invention better embodiment provides a kind of micro-grid system 1000.Institute
State micro-grid system 100 and include that micro battery 11, first is predetermined and site 12 and above-mentioned alternative plan are preferably implemented
The inverter 100 that mode provides.Described micro battery 11 is connected to the described first predetermined and site 12, thinks institute
State first and site 12 power.Described inverter 100 connects the described first predetermined and site 12, to regulate
State the first predetermined and voltage of site 12.Owing to described inverter 100 being carried out in above-mentioned alternative plan
Detailed introduction, does not repeats them here.
It should be noted that described inverter 100 is except regulating the described first predetermined and electricity of site 12
Pressure.Described inverter 100 self can also be as one and site, by the detection of described inverter 100
Unit 10 gathers voltage magnitude and the frequency of self and site, then by described droop control unit 20, described
It is corresponding that gradient control unit 30, described coordination control unit 40 and described inverter unit 50 complete output
Voltage, thus have adjusted the described inverter 100 voltage as also site.Owing to regulating described inverter 100
Principle as the principle predetermined also voltage of site described with regulation of the also voltage of site is identical, at this no longer
It is explained in detail.
In the present embodiment, described micro-grid system 100 includes the predetermined also site 12 of micro battery 11, first
And the inverter 100 that above-mentioned alternative plan better embodiment provides.Described inverter 100 includes detector unit
10, described droop control unit 20, described gradient control unit 30, coordination control unit 40 and inverter
Unit 50.Wherein, described testing circuit 10 is connected to described predetermined and site, described predetermined grid-connected to detect
The voltage magnitude of point and frequency.Described droop control unit 20 connects described detector unit 10, described to calculate
Predetermined and site is at default detection time and the voltage amplitude value difference in current detection moment and difference on the frequency, and according to institute
State voltage amplitude value difference and difference on the frequency poor to determine the described predetermined and wattful power rate variance of site and reactive power.Institute
State gradient control unit 30 and connect described detector unit 10, the voltage magnitude detected according to the current detection moment
And frequency determines described predetermined and the first active power of site and the first reactive power.Described coordination controls list
Unit 40 is connected to described droop control unit 20 and described gradient control unit 30, and has according to described first
Merit power, the first reactive power, wattful power rate variance and reactive power determine the second active power and the second nothing
Merit power.Described inverter unit 50 is connected to coordinate control unit 40 to receive described second active power
And described second reactive power, thus output determines active power and determines reactive power, wherein, described really
Determine active power having equal to described second active power, determine that reactive power is equal to described second reactive power.
Owing to exporting the most described predetermined and voltage of site and the determination active power of output and the reactive power pair determined
Should, i.e. when export described determine active power and described determine reactive power to the most described predetermined and site time, this
Carving, described predetermined and site voltage must be to determine active power with described and described determine reactive power pair
The voltage answered.Therefore, by adjusting the output to the described predetermined and active power of site and reactive power, i.e.
Can realize regulating the purpose of the described predetermined also voltage of site.
Above disclosed only one preferred embodiment of the present invention, can not limit this with this certainly
Bright interest field, one of ordinary skill in the art will appreciate that all or part of stream realizing above-described embodiment
Journey, and according to the equivalent variations that the claims in the present invention are made, still fall within the scope that invention is contained.
Claims (9)
1. a voltage adjusting method, is applied in the inverter of micro-grid system, to regulate micro-grid system
In the predetermined and voltage of site, described voltage adjusting method includes:
Detect the described predetermined and voltage magnitude of site and frequency；
Calculate described predetermined and site in default detection time and the voltage amplitude value difference in current detection moment and frequency
Difference, and determine the described predetermined and wattful power rate variance of site and nothing according to described voltage amplitude value difference and difference on the frequency
Merit difference power；Wherein, the described default detection time is poor early than the described scheduled time in current detection moment one；
The predetermined grid-connected point voltage amplitude detected according to the current detection moment and frequency determine described predetermined grid-connected
Point is in first active power in current detection moment and the first reactive power；
Determine according to described first active power, the first reactive power, wattful power rate variance and reactive power difference
Second active power and the second reactive power, wherein, described first active power is P1, described first idle merit
Rate is Q1, described wattful power rate variance is Δ P, and described reactive power difference is Δ Q, and described second active power is P2,
Described second reactive power is Q2, P2=k1P1+k2Δ P, Q2=t1Q1+t2Δ Q, k1、k2、t1And t2For weighting
Coefficient；
Output determines active power and determines that reactive power, to the most described predetermined and site, wherein, described determines have
Merit power is equal to described second active power, described determines that reactive power is equal to described second reactive power.
2. voltage adjusting method as claimed in claim 1, it is characterised in that examine according to the current detection moment
The predetermined grid-connected point voltage amplitude measured and frequency determine that described predetermined also site is in the first of the current detection moment
Active power and the first reactive power include:
The voltage magnitude detected according to the current detection moment and the micro battery of micro-grid system make a reservation for also to described
Between site, the resistance in circuit and reactance determine virtual impedance, to compensate the reactance in described circuit；
According to the resistance in the voltage magnitude detected in the described current detection moment, frequency, described circuit and
Reactance after compensation determines the voltage magnitude after described reactance compensation and frequency；
Described predetermined and site first when the current detection moment is determined according to the voltage magnitude determined and frequency
Active power and the first reactive power.
3. voltage adjusting method as claimed in claim 1, it is characterised in that output determine active power and
Determine that reactive power includes to described predetermined and site:
Instruction is sent according to described second active power and described second reactive power；
Determine active power according to described instruction output is described and determines reactive power.
4. the voltage adjusting method as described in any one of claims 1 to 3, it is characterised in that described meritorious
Difference power is the first constant times of described difference on the frequency, and described reactive power difference is the second of described voltage amplitude value difference
Constant times.
5. an inverter, is applied in micro-grid system, is used for regulating in micro-grid system predetermined and site
Voltage, it is characterised in that: described inverter includes:
Detector unit, described testing circuit is connected to described predetermined and site, to detect described predetermined and site
Voltage magnitude and frequency；
Droop control unit, described droop control unit connects described detector unit, to calculate described making a reservation for also
Site is at default detection time and the voltage amplitude value difference in current detection moment and difference on the frequency, and according to described voltage
Difference in magnitude and difference on the frequency determine that the described predetermined and wattful power rate variance of site and reactive power are poor；Wherein, institute
State the default detection time poor early than the described scheduled time in current detection moment one；
Gradient control unit, described gradient control unit connects described detector unit, according to the current detection moment
The predetermined grid-connected point voltage amplitude detected and frequency determine that described predetermined also site is in the described current detection moment
Time the first active power and the first reactive power；
Coordinating control unit, described coordination control unit is connected to described droop control unit and described gradient control
Unit processed, and poor according to described first active power, the first reactive power, wattful power rate variance and reactive power
Determining the second active power and the second reactive power, wherein, described first active power is P1, described first
Reactive power is Q1, described wattful power rate variance is Δ P, and described reactive power difference is Δ Q, described second wattful power
Rate is P2, described second reactive power is Q2, P2=k1P1+k2Δ P, Q2=t1Q1+t2Δ Q, k1、k2、t1And
t2For weight coefficient；And
Inverter unit, described inverter unit is connected to coordinate control unit, receives described second and gains merit
Power and described second reactive power, thus output determines active power and determines that reactive power is to described predetermined
And site, wherein, described determine that active power is equal to described second active power, described determine reactive power
Equal to described second reactive power.
6. inverter as claimed in claim 5, it is characterised in that described gradient control unit includes:
Virtual impedance subelement, described virtual impedance subelement is connected to described detector unit, with according to current
Line between voltage magnitude and the most described predetermined also site of the micro battery of micro-grid system that the detection moment detects
Resistance and reactance in road determine virtual impedance, to compensate the reactance in described circuit；
Determine subelement, carry out the voltage magnitude after reactance compensation and frequency in circuit for determining；
Gradient controls subelement, and described gradient controls subelement and is connected to described determine subelement, to receive really
Fixed voltage magnitude and frequency, and determine that described predetermined also site is in institute according to the voltage magnitude determined and frequency
State the first active power and first reactive power in current detection moment.
7. inverter as claimed in claim 5, it is characterised in that described inverter unit includes:
Controlling subelement, described control subelement is connected to described coordination control unit, to receive described second
Active power and described second reactive power, and according to described second active power and described second reactive power
Send instruction；
Driving and inversion subelement, described inversion subelement is connected to described control subelement and makes a reservation for also with described
Between site, to determine active power and determine reactive power according to described instruction output, wherein, described really
Determine active power having equal to described second active power, determine that reactive power is equal to described second reactive power.
8. inverter as claimed in claim 5, it is characterised in that described wattful power rate variance is described frequency
First constant times of difference, described reactive power difference is second constant coefficient times of described voltage amplitude value difference.
9. a micro-grid system, including micro battery, the first predetermined and site and as claim 5-8 is arbitrary
Inverter described in Xiang, described micro battery is connected to the described first predetermined and site, thinks that described first makes a reservation for
And site powers, described inverter connects the described first predetermined and site, with regulate described first make a reservation for grid-connected
The voltage of point.
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| CN104917170B (en) * | 2015-05-04 | 2017-06-06 | 福州大学 | A kind of method that micro-capacitance sensor self adaptation droop control based on PI controls adjusts electric voltage frequency |
| CN107658887B (en) * | 2017-01-10 | 2021-07-30 | 中国电力科学研究院有限公司 | New energy power generation fast reactive response control method based on droop control |
| CN109038600A (en) * | 2018-06-29 | 2018-12-18 | 中国电力科学研究院有限公司 | A kind of power quality treatment method and device of distributed generation system |
| CN115313479A (en) * | 2022-07-26 | 2022-11-08 | 华为数字能源技术有限公司 | Power supply system and grid-connected control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208817A (en) * | 2011-05-13 | 2011-10-05 | 中国电子科技集团公司第三十六研究所 | Reactive-power-disturbance-based grid-connected island detection method for photovoltaic system |
| JP2012085500A (en) * | 2010-10-15 | 2012-04-26 | Mitsubishi Electric Corp | Reactive power compensation device |
| CN103606954A (en) * | 2013-11-27 | 2014-02-26 | 上海电力学院 | Novel grid-connected photovoltaic power generation control method |
| CN103683324A (en) * | 2013-12-04 | 2014-03-26 | 浙江大学 | Improved droop control method based on communication network for distributed power source in parallel connection operation mode in micro power grid system |
-
2014
- 2014-05-15 CN CN201410206919.6A patent/CN103997042B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012085500A (en) * | 2010-10-15 | 2012-04-26 | Mitsubishi Electric Corp | Reactive power compensation device |
| CN102208817A (en) * | 2011-05-13 | 2011-10-05 | 中国电子科技集团公司第三十六研究所 | Reactive-power-disturbance-based grid-connected island detection method for photovoltaic system |
| CN103606954A (en) * | 2013-11-27 | 2014-02-26 | 上海电力学院 | Novel grid-connected photovoltaic power generation control method |
| CN103683324A (en) * | 2013-12-04 | 2014-03-26 | 浙江大学 | Improved droop control method based on communication network for distributed power source in parallel connection operation mode in micro power grid system |
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