CN103997042A - Voltage regulation method, inverter and micro-grid system - Google Patents
Voltage regulation method, inverter and micro-grid system Download PDFInfo
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- CN103997042A CN103997042A CN201410206919.6A CN201410206919A CN103997042A CN 103997042 A CN103997042 A CN 103997042A CN 201410206919 A CN201410206919 A CN 201410206919A CN 103997042 A CN103997042 A CN 103997042A
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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 voltage regulation method used for regulating voltage of a reserved grid connection point of a micro-grid system. The method comprises the steps of detecting voltage amplitude and frequency of the reserved grid connection point; calculating the difference between voltage amplitudes and the difference between frequencies of the reserved grid connection point at the reserved detection time and the current detection time, and determining the active power difference and the reactive power difference of the reserved grid connection point, wherein the reserved detection time is before the current detection time by a reserved time difference; determining first active power and first reactive power of the reserved grid connection point according to the voltage amplitude and the frequency detected at the current detection time; determining second active power and second reactive power according to the first active power, the first reactive power, the active power difference and the reactive power difference; outputting determined active power and determined reactive power, wherein the determined active power is equal to the second active power and the determined reactive power is equal to the second reactive power. The method achieves the purpose of regulating the reserved grid connection point. The invention further provides an inverter and the micro-grid system.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of micro-grid system and inverter thereof.
Background technology
Due to the distributed generation system important tie of regenerative resource access electrical network still not, and can also improve to a certain extent the stability of traditional electrical network, obtain in recent years increasing attention.Because the regenerative resources such as wind energy, solar energy have intermittence, randomness, be typical uncontrollable source, therefore micro-electrical network arises at the historic moment.Micro-electrical network, as a kind of integrated local power system of multiple renewable energy sources, energy storage device and load, has obtained research widely in recent years.In micro-grid system, various micro-power supplys (regenerative resource etc.) generally need to pass through combining inverter incoming transport electrical network.Current grid-connected inverters is mainly divided into two kinds of patterns.Be a voltage source mode, another kind is current source pattern.For a micro-grid system comes, voltage and the frequency of this micro-grid system of inverter control of a voltage source mode, the power of this micro-grid system of inverter control of current source pattern, to guarantee the normal operation of micro-grid system.But, micro-power supply distance radius of electricity supply a certain and site is longer at any time, cause in radius of electricity supply voltage-drop larger, the power of simultaneously sending into this and site load is fewer, thereby it is lower to make to supply with the described also voltage of site and the parameters such as power of input, causes and cannot guarantee this also normal operation of 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, thereby guarantee that the load of this and site can normally move.
First aspect, provides a kind of voltage adjusting method, is applied in the inverter of micro-grid system, and to regulate the voltage of predetermined in micro-grid system and site, described voltage adjusting method comprises:
Detect described predetermined also voltage magnitude and the frequency of site;
Calculate described predetermined also site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that according to described voltage amplitude value difference and difference on the frequency described wattful power rate variance and reactive power predetermined and site are poor; Wherein, described default detection time is poor early than described one scheduled time of the current detection moment;
The predetermined grid-connected point voltage amplitude constantly detecting according to current detection and frequency determine that described predetermined also site is in described current detection the first active power and the first reactive power constantly;
According to described the first active power, the first reactive power, wattful power rate variance and reactive power, determine the second active power and the second reactive power;
Output determines that active power and definite reactive power are to described predetermined and site, and wherein, described definite active power equals described the second active power, and described definite reactive power equals described the second reactive power.
In the possible implementation of the first of first aspect, the predetermined grid-connected point voltage amplitude constantly detecting according to current detection and frequency determine that described predetermined also site comprises in described current detection the first active power and the first reactive power constantly:
Virtual impedance is determined in micro-power supply of the voltage magnitude constantly detecting according to current detection and micro-grid system to resistance and reactance in circuit between described predetermined and site, with the reactance in described circuit, compensates;
Determine and carry out the voltage magnitude after reactance compensation and frequency in circuit;
According to definite voltage magnitude and frequency, determine that described predetermined also site is in described current detection the first active power and the first reactive power constantly.
In the possible implementation of the second of first aspect, output determines that active power and definite reactive power to described predetermined also site comprise:
According to described the second active power and described the second reactive power, send instruction;
According to the described instruction described definite active power of output and definite reactive power.
In the third possible implementation of first aspect, or be combined in the first or the possible implementation of the second of first aspect, in the third possible implementation, described wattful power rate variance is the first constant times of described difference on the frequency, and described reactive power is poor is the second constant times of described voltage amplitude value difference.
Second aspect, provides a kind of inverter, is applied in micro-grid system, and for regulating the predetermined also voltage of site of micro-grid system, described inverter comprises:
Detecting unit, described testing circuit is connected to described predetermined and site, to detect described predetermined also voltage magnitude and the frequency of site;
Droop control unit, described droop control unit connects described detecting unit, to calculate described predetermined also site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that according to described voltage amplitude value difference and difference on the frequency described wattful power rate variance and reactive power predetermined and site are poor; Wherein, described default detection time is poor early than described one scheduled time of the current detection moment;
Gradient control unit, described gradient control unit connects described detecting unit, and the grid-connected point voltage amplitude constantly detecting according to current detection and frequency determine that described predetermined also site is in described current detection the first active power and the first reactive power constantly;
Coordinate control unit, described coordination control unit is connected to described droop control unit and described gradient control unit, and determines the second active power and the second reactive power according to described the first active power, the first reactive power, wattful power rate variance and reactive power; And
Inverter unit, described inverter unit is connected to coordination control unit, receive described the second active power and described the second reactive power, thereby output determines that active power and definite reactive power are to described predetermined and site, wherein, described definite active power equals described the second active power, and described definite reactive power equals described the second reactive power.
In the possible implementation of the first of second aspect, described gradient control unit comprises:
Virtual impedance subelement, described virtual impedance subelement is connected to described detecting unit, with micro-power supply of the voltage magnitude that constantly detects according to current detection and micro-grid system to resistance and reactance in the circuit between described predetermined and site, determine virtual impedance, with the reactance in described circuit, compensate;
Determine subelement, for determining, carry out voltage magnitude and the frequency after circuit reactance compensation;
Gradient is controlled subelement, described gradient is controlled subelement and is connected to described definite subelement, to receive definite voltage magnitude and frequency, and determine that according to definite voltage magnitude and frequency described predetermined also site is in described current detection the first active power and the first reactive power constantly.
In the possible implementation of the second of second aspect, described inverter unit comprises:
Control subelement, described control subelement is connected to described coordination control unit, to receive described the second active power and described the second reactive power, and sends instruction according to described the second active power and described the second reactive power;
Drive and inversion subelement, described inversion subelement is connected to described control subelement and described predetermined also between site, to determine active power and definite reactive power according to described instruction output, wherein, described definite active power equals having of described the second active power, determines that reactive power equals described the second reactive power.
In the third possible implementation of second aspect, described wattful power rate variance is the first constant times of described difference on the frequency, and described reactive power is poor is second constant coefficient times of described voltage amplitude value difference.
The third aspect, a kind of micro-grid system is provided, comprise a kind of described inverter in micro-power supply, the first predetermined also site and above-mentioned various possible implementation, described micro-power supply is connected to the described first predetermined and site, think the described first also site power supply, described inverter connects the described first predetermined and site, to regulate the described first predetermined also voltage of site.
The voltage adjusting method providing according to various implementations, this voltage adjusting method is applied in the inverter of micro-grid system, with the voltage of predetermined in adjusting micro-grid system and site, described voltage adjusting method detects described predetermined also voltage magnitude and the frequency of site; Calculate described predetermined also site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that according to described voltage amplitude value difference and difference on the frequency described wattful power rate variance and reactive power predetermined and site are poor; Wherein, described default detection time is poor early than described one scheduled time of the current detection moment; The voltage magnitude constantly detecting according to current detection and frequency determine that described predetermined also site is in current detection the first active power and the first reactive power constantly; According to described the first active power, the first reactive power, wattful power rate variance and reactive power, determine the second active power and the second reactive power; Output determines that active power and definite reactive power are to described predetermined and site, and wherein, described definite active power equals described the second active power, and described definite reactive power equals described the second reactive power.Owing to exporting to, described active power and the reactive power predetermined and voltage of site and the described predetermined also site of output are corresponding, when exporting the active power of described predetermined and site and reactive power to when different, voltage described and site changes thereupon, so the present invention has realized the object of the voltage that regulates described predetermined and site.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of a kind of voltage adjusting method of providing of the present invention's the first scheme better embodiment;
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 of providing of alternative plan better embodiment of the present invention;
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 micro-electrical network of providing of third party's case better embodiment of the present invention.
Embodiment
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 clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, the present invention's the first scheme better embodiment provides a kind of voltage adjusting method.Described voltage adjusting method is applied in the inverter of micro-grid system, to regulate the voltage of predetermined in micro-grid system and site.Described voltage adjusting method comprises step.
Step 101, detect voltage magnitude and the frequency of described predetermined and site.
Wherein, in micro-grid system, described micro-grid system comprises micro-power supply and the also site to micro-power supply by connection.The radius of electricity supply of micro-power supply distance site is longer at any time, cause in radius of electricity supply voltage-drop larger, send into that to be connected to the power of this and site load fewer simultaneously, thereby it is lower to make to supply with the described and voltage of site and the parameters such as power of input, cannot guarantee that the load of this and site normally moves.Therefore can select so also site as predetermined and site.In the present embodiment, detecting the voltage magnitude of described predetermined and site and frequency is to detect in real time voltage magnitude and the frequency of described predetermined and site.
Step 102, calculate described predetermined and site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that 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, described default detection time is poor early than described one scheduled time of the current detection moment.
It should be noted that, poor can setting according to actual needs of the described scheduled time, as half a minute or one minute etc.Described current detection is the moment of current this detection constantly.Can be the time that the last time is detected described default detection time, and the scheduled time is poor described in the time phase difference of the last time of detecting and current this detection.Wherein, when default detection time, the voltage assignment calculating is | U
2|, the frequency calculating is f
1.In current detection constantly, the voltage magnitude calculating is | U
2|, the frequency calculating is f
2.Therefore in default detection time and current detection voltage amplitude value difference constantly, be, △ | U|=|U
2|-| U
2|; In default detection time and current detection difference power constantly, be △ f=f
2-f
1.And the pass of wattful power rate variance and difference power is △ P=K
p* △ f, K
pfor constant coefficient; Reactive power poor with pass voltage amplitude value difference be △ Q=K
q* △ | U|, K
qfor constant coefficient.Therefore, can determine that described wattful power rate variance and reactive power predetermined and site are poor according to described voltage amplitude value difference and difference on the frequency.
Step 103, the predetermined grid-connected point voltage amplitude constantly detecting according to current detection and frequency determine that described predetermined also site is in described current detection the first active power and the first reactive power constantly.
Wherein, in the gradient control unit of inverter, store gradient function, in gradient function, voltage magnitude and frequency are the variablees in described gradient function, and active power and reactive power are as function.Wherein, corresponding unique active power and the reactive power of voltage magnitude and frequency.Therefore, can, by the voltage magnitude getting and frequency are brought in gradient function, can obtain corresponding active power and reactive power.
It should be noted that, when if from described micro-power supply to the circuit described predetermined and site, impedance meeting has a strong impact on described micro-power supply and exports the active power of described predetermined and site and reactive power to, can be by taking the line build-out that carries out of virtual impedance technical equivalences, thus the impedance that as far as possible reduces circuit is on described predetermined and the active power of site and the impact of reactive power.Be in particular:
Please continue to refer to Fig. 2, step 103 can comprise the following steps.
Virtual impedance is determined in micro-power supply of step 1031, the voltage magnitude constantly detecting according to current detection and micro-grid system to resistance and reactance in circuit between described predetermined and site, with the reactance in described circuit, compensates.
Particularly, according to the resistance in described circuit and reactance, can in inverter control loop, equivalence increase a virtual impedance, thereby change current micro-power supply to the described predetermined also impedance situation of the circuit between site, realize line build-out, thereby the impedance that as far as possible reduces circuit is on described predetermined and the active power of site and the impact of reactive power.
Voltage magnitude and the frequency after described reactance compensation determined in reactance after resistance in step 1032, the voltage magnitude constantly detecting according to current detection, frequency, described circuit and compensation.
It should be noted that, after reactance supplements in to circuit, described voltage magnitude and frequency can change.Voltage magnitude and the frequency after described reactance compensation determined in reactance after resistance in the voltage magnitude that can constantly detect according to current detection, frequency, described circuit and compensation.
Step 1033, according to definite voltage magnitude and frequency, determine that described predetermined and site is in described current detection the first active power and the first reactive power constantly.
Step 104, according to described the first active power, the first reactive power, wattful power rate variance and reactive power, determine the second active power and the second reactive power;
Particularly, described the first active power is P
1.Described the first reactive power is Q
1.Described the second active power is P
2.Described the second reactive power is Q
2.Wherein, P
2=k
1p
1+ k
2△ P, Q
2=t
1q
1+ t
2△ Q, k
1, k
2, t
1and t
2weight coefficient, described weight coefficient can need to be adjusted according to applying.
Step 105, output determine that active power and definite reactive power are to described predetermined and site, and wherein, described definite active power equals described the second active power, and described definite reactive power equals described the second reactive power.
It should be noted that, owing to exporting to, described active power and the reactive power predetermined and voltage of site and the described predetermined also site of output are corresponding, when the described definite active power of output and the extremely described predetermined also site of described definite reactive power, this moment, described voltage predetermined and site must be the voltage corresponding with described definite active power and described definite reactive power.Therefore, by adjusting the output to described active power and reactive power predetermined and site, can change the described predetermined also voltage of site.
Please continue to refer to Fig. 3, particularly, described step 105 comprises the following steps:
Step 1051, according to described the second active power and described the second reactive power, send instruction.
Step 1052, according to the described definite active power of instruction output and described definite reactive power.Wherein, described definite active power equals having of described the second active power, determines that reactive power equals described the second reactive power.
Wherein, described definite active power is P
out.Described definite idle reactive power is Q
out.P
out=P
2; Q
out=Q
2.Owing to exporting to, the described predetermined and voltage of site and definite active power of output and definite reactive power are corresponding, when the described definite active power of output and the extremely described predetermined also site of described definite reactive power, this moment, described voltage predetermined and site must be the voltage corresponding with described definite active power and described definite reactive power.Therefore,, by adjusting the output to described predetermined also active power and the reactive power of site, can realize the described predetermined also object of the voltage of site of adjusting.
In the present embodiment, described voltage adjusting method is by detecting described predetermined also voltage magnitude and the frequency of site; Calculate described predetermined also site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that according to described voltage amplitude value difference and difference on the frequency described wattful power rate variance and reactive power predetermined and site are poor; Wherein, described default detection time is poor early than described one scheduled time of the current detection moment; The predetermined grid-connected point voltage amplitude constantly detecting according to current detection and frequency are determined described predetermined also the first active power and first reactive power of site; According to described the first active power, the first reactive power, wattful power rate variance and reactive power, determine the second active power and the second reactive power; Output determines that active power and definite reactive power are to described predetermined and site, and wherein, described definite active power equals described the second active power, and described definite reactive power equals described the second reactive power.Owing to exporting to, the described predetermined and voltage of site and definite active power of output and definite reactive power are corresponding, when the described definite active power of output and the extremely described predetermined also site of described definite reactive power, this moment, described voltage predetermined and site must be the voltage corresponding with described definite active power and described definite reactive power.Therefore,, by adjusting the output to described predetermined also active power and the reactive power of site, can realize the described predetermined also object of the voltage of site of adjusting.
Refer to Fig. 4, alternative plan better embodiment of the present invention provides a kind of inverter 100.In described inverter applications and micro-grid system, for regulating the predetermined also voltage of site of described micro-grid system.Described inverter comprises detecting unit 10, droop control unit 20, gradient control unit 30, coordinates control unit 40 and inverter unit 50.
Described detecting unit 10 is connected to described predetermined and site, to detect described predetermined also voltage magnitude and the frequency of site.
Wherein, in micro-grid system, described micro-grid system comprises micro-power supply and the also site to micro-power supply by connection.The radius of electricity supply of micro-power supply distance site is longer at any time, cause in radius of electricity supply voltage-drop larger, send into that to be connected to the power of this and site load fewer simultaneously, thereby it is lower to make to supply with the described and voltage of site and the parameters such as power of input, cannot guarantee that the load of this and site normally moves.Therefore can select so also site as predetermined and site.In the present embodiment, detecting the voltage magnitude of described predetermined and site and frequency is to detect in real time voltage magnitude and the frequency of described predetermined and site.
Described droop control unit 20 connects described detecting unit 10, to calculate described predetermined also site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that according to described voltage amplitude value difference and difference on the frequency described wattful power rate variance and reactive power predetermined and site are poor.Wherein, described default detection time is poor early than described one scheduled time of the current detection moment.
It should be noted that, poor can setting according to actual needs of the described scheduled time, as half a minute or one minute etc.Described current detection can be current this time while detecting constantly.Can be the time that the last time is detected described default detection time, and the scheduled time is poor described in the time phase difference of the last time of detecting and current this detection.Wherein, when default detection time, the voltage assignment that described droop control unit 20 calculates is | U
2|, the frequency calculating is f
1.In current detection constantly, the voltage magnitude that described droop control unit 20 calculates is | U
2|, the frequency calculating is f
2.Therefore in default detection time and current detection voltage amplitude value difference constantly, be, △ | U|=|U
2|-| U
2|; In default detection time and current detection difference power constantly, be △ f=f
2-f
1.And the pass of wattful power rate variance and difference power is △ P=K
p* △ f, K
pfor constant coefficient; Reactive power poor with pass voltage amplitude value difference be △ Q=K
q* △ | U|, K
qfor constant coefficient.Therefore, described droop control unit 20 can determine that described wattful power rate variance and reactive power predetermined and site are poor according to described voltage amplitude value difference and difference on the frequency.
Described gradient control unit 30 connects described detecting unit 10, according to the predetermined grid-connected point voltage amplitude constantly detecting in described current detection and frequency, determines that described predetermined also site is in described current detection the first active power and the first reactive power constantly.
Wherein, in described gradient control unit 30, store gradient function.In gradient function, voltage magnitude and frequency are the variablees in described gradient function, and active power and reactive power are as function.Wherein, corresponding unique active power and the reactive power of voltage magnitude and frequency.Therefore, described gradient control unit 30 can, by the voltage magnitude getting and frequency are brought in gradient function, can obtain corresponding active power and reactive power.
It should be noted that, when if from described micro-power supply to the circuit described predetermined and site, impedance meeting has a strong impact on described micro-power supply and exports the active power of described predetermined and site and reactive power to, can be by taking the mode of virtual impedance to carry out line build-out, thus the impedance that as far as possible reduces circuit is on described predetermined and the active power of site and the impact of reactive power.Be in particular:
Please continue to refer to Fig. 5, described gradient control unit 30 comprises virtual impedance subelement 31, determines subelement 32 and gradient control subelement 33.
Described virtual impedance subelement 31 is connected to described detecting unit 10, to determine virtual impedance according to micro-power supply of the voltage magnitude that constantly detects in described current detection and micro-grid system to resistance and reactance in circuit between described predetermined and site, with the reactance in described circuit, compensate.
Particularly, according to the resistance in described circuit and reactance, can in inverter control loop, equivalence increase a virtual impedance, thereby change current micro-power supply to the described predetermined also impedance situation of the circuit between site, realize line build-out, thereby the impedance that as far as possible reduces circuit is on described predetermined and the active power of site and the impact of reactive power.
Described definite subelement 32, is connected to described virtual impedance subelement 31, to determine voltage magnitude and the frequency after described reactance compensation according to the reactance after the resistance in the voltage magnitude constantly detecting in described current detection, frequency, described circuit and compensation.
It should be noted that, after reactance supplements in to circuit, described voltage magnitude and frequency can change.Voltage magnitude and the frequency after described reactance compensation determined in reactance after resistance in the voltage magnitude that described definite subelement 32 can detect constantly according to current detection, frequency, described circuit and compensation.
Described gradient is controlled subelement 33 and is connected to described definite subelement 31, to determine that according to definite voltage magnitude and frequency described predetermined also site is in described current detection the first active power and the first reactive power constantly.
Described coordination control unit 40 is connected to described droop control unit 20 and described gradient control unit 30, and determines the second active power and the second reactive power according to described the first active power, the first reactive power, wattful power rate variance and reactive power.
Particularly, described the first active power is P
1.Described the first reactive power is Q
1.Described the second active power is P
2.Described the second reactive power is Q
2.Wherein, P
2=k
1p
1+ k
2△ P, Q
2=t
1q
1+ t
2△ Q, k
1, k
2, t
1and t
2weight coefficient, described weight coefficient can need to be adjusted according to applying.
Described inverter unit 50 is connected to coordinates control unit 40, receive described the second active power and described the second reactive power, thereby output determines that active power and definite reactive power are to described predetermined and site, wherein, described definite active power equals described the second active power, and described definite reactive power equals described the second reactive power.
It should be noted that, owing to exporting to, described active power and the reactive power predetermined and voltage of site and the described predetermined also site of output are corresponding, when the described definite active power of output and the extremely described predetermined also site of described definite reactive power, this moment, described voltage predetermined and site must be the voltage corresponding with described definite active power and described definite reactive power.Therefore, by adjusting the output to described active power and reactive power predetermined and site, can change the described predetermined also voltage of site.
Please continue to refer to Fig. 6, particularly, described inverter unit 50 comprises controls subelement 51 and driving and inversion subelement 52.
Described control subelement 51 is connected to described coordination control unit 40, to receive described the second active power and described the second reactive power, and sends instruction according to described the second active power and described the second reactive power.
Described driving and inversion subelement 52 are connected to described control subelement 51 and described predetermined also between site, to determine active power and definite reactive power according to described instruction output.Wherein, described definite active power equals described the second active power, determines that reactive power equals described the second reactive power.
Wherein, described definite active power is P
out.Described definite idle reactive power is Q
out.P
out=P
2; Q
out=Q
2.Owing to exporting to, the described predetermined and voltage of site and definite active power of output and definite reactive power are corresponding, when the described definite active power of output and the extremely described predetermined also site of described definite reactive power, this moment, described voltage predetermined and site must be the voltage corresponding with described definite active power and described definite reactive power.Therefore,, by adjusting the output to described predetermined also active power and the reactive power of site, can realize the described predetermined also object of the voltage of site of adjusting.
In the present embodiment, described inverter 100 comprises detecting unit 10, described droop control unit 20, described gradient control unit 30, coordinates control unit 40 and inverter unit 50.Wherein, described testing circuit 10 is connected to described predetermined and site, to detect described predetermined also voltage magnitude and the frequency of site.Described droop control unit 20 connects described detecting unit 10, to calculate described predetermined also site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that according to described voltage amplitude value difference and difference on the frequency described wattful power rate variance and reactive power predetermined and site are poor.Described gradient control unit 30 connects described detecting unit 10, and the predetermined grid-connected point voltage amplitude constantly detecting according to current detection and frequency are determined described predetermined also the first active power and first reactive power of site.Described coordination control unit 40 is connected to described droop control unit 20 and described gradient control unit 30, and determines the second active power and the second reactive power according to described the first active power, the first reactive power, wattful power rate variance and reactive power.Described inverter unit 50 is connected to coordination control unit 40 and receives described the second active power and described the second reactive power, thereby active power and definite reactive power are determined in output, wherein, described definite active power equals having of described the second active power, determines that reactive power equals described the second reactive power.Owing to exporting to, the described predetermined and voltage of site and definite active power of output and definite reactive power are corresponding, when the described definite active power of output and the extremely described predetermined also site of described definite reactive power, this moment, described voltage predetermined and site must be the voltage corresponding with described definite active power and described definite reactive power.Therefore,, by adjusting the output to described predetermined also active power and the reactive power of site, can realize the described predetermined also object of the voltage of site of adjusting.
Refer to Fig. 7, third party's case better embodiment of the present invention provides a kind of micro-grid system 1000.Described micro-grid system 100 comprises the inverter 100 that micro-power supply the 11, first predetermined also site 12 and above-mentioned alternative plan better embodiment provide.Described micro-power supply 11 is connected to the described first predetermined and site 12, thinks the described first also site 12 power supplies.Described inverter 100 connects the described first predetermined and site 12, to regulate the described first predetermined also voltage of site 12.Owing to described inverter 100 being described in detail in above-mentioned alternative plan, do not repeat them here.
It should be noted that, described inverter 100 is except regulating the described first predetermined also voltage of site 12.Described inverter 100 self also can be used as one and site, detecting unit 10 by described inverter 100 gathers self also voltage magnitude and the frequency of site, by described droop control unit 20, described gradient control unit 30, described coordination control unit 40 and described inverter unit 50, complete the corresponding voltage of output again, thereby regulated the voltage of described inverter 100 conducts site.Due to regulate described inverter 100 as and the principle of the voltage of site with regulate the principle of the described predetermined also voltage of site identical, at this, be no longer explained in detail.
In the present embodiment, described micro-grid system 100 comprises the inverter 100 that micro-power supply the 11, first predetermined also site 12 and above-mentioned alternative plan better embodiment provide.Described inverter 100 comprises detecting unit 10, described droop control unit 20, described gradient control unit 30, coordinates control unit 40 and inverter unit 50.Wherein, described testing circuit 10 is connected to described predetermined and site, to detect described predetermined also voltage magnitude and the frequency of site.Described droop control unit 20 connects described detecting unit 10, to calculate described predetermined also site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that according to described voltage amplitude value difference and difference on the frequency described wattful power rate variance and reactive power predetermined and site are poor.Described gradient control unit 30 connects described detecting unit 10, and the voltage magnitude constantly detecting according to current detection and frequency are determined described predetermined also the first active power and first reactive power of site.Described coordination control unit 40 is connected to described droop control unit 20 and described gradient control unit 30, and determines the second active power and the second reactive power according to described the first active power, the first reactive power, wattful power rate variance and reactive power.Described inverter unit 50 is connected to coordination control unit 40 and receives described the second active power and described the second reactive power, thereby active power and definite reactive power are determined in output, wherein, described definite active power equals having of described the second active power, determines that reactive power equals described the second reactive power.Owing to exporting to, the described predetermined and voltage of site and definite active power of output and definite reactive power are corresponding, when the described definite active power of output and the extremely described predetermined also site of described definite reactive power, this moment, described voltage predetermined and site must be the voltage corresponding with described definite active power and described definite reactive power.Therefore,, by adjusting the output to described predetermined also active power and the reactive power of site, can realize the described predetermined also object of the voltage of site of adjusting.
Above disclosed is only a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, one of ordinary skill in the art will appreciate that all or part of flow process that realizes above-described embodiment, and the equivalent variations of doing according to the claims in the present invention, still belong to the scope that invention is contained.
Claims (9)
1. a voltage adjusting method, is applied in the inverter of micro-grid system, and to regulate the voltage of predetermined in micro-grid system and site, described voltage adjusting method comprises:
Detect described predetermined also voltage magnitude and the frequency of site;
Calculate described predetermined also site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that according to described voltage amplitude value difference and difference on the frequency described wattful power rate variance and reactive power predetermined and site are poor; Wherein, described default detection time is poor early than described one scheduled time of the current detection moment;
The predetermined grid-connected point voltage amplitude constantly detecting according to current detection and frequency determine that described predetermined also site is in current detection the first active power and the first reactive power constantly;
According to described the first active power, the first reactive power, wattful power rate variance and reactive power are poor, determine the second active power and the second reactive power;
Output determines that active power and definite reactive power are to described predetermined and site, and wherein, described definite active power equals described the second active power, and described definite reactive power equals described the second reactive power.
2. voltage adjusting method as claimed in claim 1, is characterized in that, the predetermined grid-connected point voltage amplitude constantly detecting according to current detection and frequency determine that described predetermined also site comprises in current detection the first active power and the first reactive power constantly:
Virtual impedance is determined in micro-power supply of the voltage magnitude constantly detecting according to current detection and micro-grid system to resistance and reactance in circuit between described predetermined and site, with the reactance in described circuit, compensates;
According to the reactance after the resistance in the voltage magnitude constantly detecting in described current detection, frequency, described circuit and compensation, determine voltage magnitude and the frequency after described reactance compensation;
According to definite voltage magnitude and frequency determine described predetermined and site in current detection the first active power and the first reactive power constantly time.
3. voltage adjusting method as claimed in claim 1, is characterized in that, output determines that active power and definite reactive power to described predetermined also site comprise:
According to described the second active power and described the second reactive power, send instruction;
According to the described instruction described definite active power of output and definite reactive power.
4. the voltage adjusting method as described in claims 1 to 3 any one, is characterized in that, described wattful power rate variance is the first constant times of described difference on the frequency, and described reactive power is poor is the second constant times of described voltage amplitude value difference.
5. an inverter, is applied in micro-grid system, for regulating the predetermined also voltage of site of micro-grid system, it is characterized in that: described inverter comprises:
Detecting unit, described testing circuit is connected to described predetermined and site, to detect described predetermined also voltage magnitude and the frequency of site;
Droop control unit, described droop control unit connects described detecting unit, to calculate described predetermined also site at default detection time and current detection voltage amplitude value difference and difference on the frequency constantly, and determine that according to described voltage amplitude value difference and difference on the frequency described wattful power rate variance and reactive power predetermined and site are poor; Wherein, described default detection time is poor early than described one scheduled time of the current detection moment;
Gradient control unit, described gradient control unit connects described detecting unit, the predetermined grid-connected point voltage amplitude constantly detecting according to current detection and frequency determine described predetermined and site in described current detection the first active power and the first reactive power constantly time;
Coordinate control unit, described coordination control unit is connected to described droop control unit and described gradient control unit, and determines the second active power and the second reactive power according to described the first active power, the first reactive power, wattful power rate variance and reactive power are poor; And
Inverter unit, described inverter unit is connected to coordination control unit, receive described the second active power and described the second reactive power, thereby output determines that active power and definite reactive power are to described predetermined and site, wherein, described definite active power equals described the second active power, and described definite reactive power equals described the second reactive power.
6. inverter as claimed in claim 5, is characterized in that, described gradient control unit comprises:
Virtual impedance subelement, described virtual impedance subelement is connected to described detecting unit, with micro-power supply of the voltage magnitude that constantly detects according to current detection and micro-grid system to resistance and reactance in the circuit between described predetermined and site, determine virtual impedance, with the reactance in described circuit, compensate;
Determine subelement, for determining, carry out voltage magnitude and the frequency after circuit reactance compensation;
Gradient is controlled subelement, described gradient is controlled subelement and is connected to described definite subelement, to receive definite voltage magnitude and frequency, and determine that according to definite voltage magnitude and frequency described predetermined also site is in described current detection the first active power and the first reactive power constantly.
7. inverter as claimed in claim 5, is characterized in that, described inverter unit comprises:
Control subelement, described control subelement is connected to described coordination control unit, to receive described the second active power and described the second reactive power, and sends instruction according to described the second active power and described the second reactive power;
Drive and inversion subelement, described inversion subelement is connected to described control subelement and described predetermined also between site, to determine active power and definite reactive power according to described instruction output, wherein, described definite active power equals having of described the second active power, determines that reactive power equals described the second reactive power.
8. inverter as claimed in claim 5, is characterized in that, described wattful power rate variance is the first constant times of described difference on the frequency, and described reactive power is poor is second constant coefficient times of described voltage amplitude value difference.
9. a micro-grid system, comprise micro-power supply, the first predetermined and site and inverter as described in claim 5-8 any one, described micro-power supply is connected to the described first predetermined and site, think the described first also site power supply, described inverter connects the described first predetermined and site, to regulate the described first predetermined also voltage of site.
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