CN104917181B - Idle and harmonic compensation method, device and system - Google Patents
Idle and harmonic compensation method, device and system Download PDFInfo
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- CN104917181B CN104917181B CN201510374420.0A CN201510374420A CN104917181B CN 104917181 B CN104917181 B CN 104917181B CN 201510374420 A CN201510374420 A CN 201510374420A CN 104917181 B CN104917181 B CN 104917181B
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The embodiment of the present invention provides a kind of idle and harmonic compensation method, device and system, and the voltage and current of header box output point is exchanged by acquisition；According to the voltage and current, the reactive-load compensation total amount and each harmonic for obtaining electric current compensate total component；According to preset rules subcomponent is compensated for the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic, wherein, it distributes to the reactive-load compensation subcomponent of all inverters and for the reactive-load compensation total amount, distribute to the same first harmonic compensation subcomponent of all inverters and compensates total amount for the same first harmonic；Distribution instruction is sent to each inverter, the distribution instruction of each inverter includes the reactive-load compensation subcomponent for distributing to the inverter and each harmonic compensation subcomponent, each inverter is exported according to reactive-load compensation subcomponent and each harmonic compensation subcomponent and the active power of inverter, it determines the final output amount of the inverter, reduces the construction cost of photovoltaic power station system.
Description
Technical field
The present embodiments relate to power technology more particularly to a kind of idle and harmonic compensation method, device and system.
Background technology
In electric system, there is very big harm in idle and harmonic wave.Such as：It is idle line loss to be caused to increase, harmonic wave
Electrical equipment fault etc. can be caused.Therefore, idle in electric system construction and harmonic compensation is the problem of must take into consideration.
In photovoltaic power station system, each solar panel is connected with an inverter, and inverter is by the direct current energy of solar panel
Alternating current is converted into, the electricity of all inverter outputs is collected by exchange header box, after transformer progress transformation
Medium voltage network output is output to, however, since inverter can generate harmonic wave, also, power grid output generates nothing in transfer process
Work(power, therefore, it is necessary to carry out idle and harmonic compensation, in the prior art, by increasing between exchange header box and transformer
Capacitance compensating cabinet is powered up, carries out reactive power compensation, to reduce the loss of power grid outlet line, improves power supply efficiency.
However, using the above scheme, the cost of capacitor compensation cabinet is higher, increase the construction cost of photovoltaic power station system.
Invention content
The embodiment of the present invention provides a kind of idle and harmonic compensation method, device and system, to reduce photovoltaic power station system
Construction cost.
In a first aspect, the embodiment of the present invention provides a kind of idle and harmonic compensation method, including：
Obtain the voltage and current of exchange header box output point；
According to the voltage and current, the reactive-load compensation total amount and each harmonic for obtaining electric current compensate total component；
Subcomponent is compensated for the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic according to preset rules,
In, it distributes to the reactive-load compensation subcomponent of all inverters and for the reactive-load compensation total amount, distributes to all inverters
With first harmonic compensation subcomponent and for the same first harmonic compensate total amount；
To each inverter transmission distribution instruction, the distribution instruction of each inverter, which includes, distributes to the inverter
Reactive-load compensation subcomponent and each harmonic compensation subcomponent.
With reference to first aspect, in the first possible realization method of first aspect, described according to preset rules is each
The corresponding reactive-load compensation subcomponent of inverter distribution and each harmonic compensation subcomponent, including：
Rated power according to each inverter is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each time are humorous
Wave compensates subcomponent；
Alternatively,
Dump power according to each inverter is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each time are humorous
Wave compensates subcomponent.
The possible realization method of with reference to first aspect the first, in second of possible realization method of first aspect
In, the rated power according to each inverter is the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic
Subcomponent is compensated, including：
According to formula
It is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The amplitude of stream, wherein, M is the sum of inverter,For the rated power of m platform inverters, 1≤m≤M and it is integer, works as institute
It is described when stating i=1It is described for the amplitude of the electric current of A phase reactive-load compensation total amounts gotTo distribute to m platform inversions
The amplitude of the electric current of the reactive-load compensation subcomponent of device, when i >=2 and for integer when, it is describedFor the A phase iths got
The amplitude of the electric current of the total component of harmonic compensation, it is describedTo distribute to the ith harmonic compensation subcomponent of m platform inverters
The amplitude of electric current；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The phase of stream,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent
Position, it is described as the i=1Represent the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents that gets, when the i >=
2 and for integer when, it is describedRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, all inverters
A identical first harmonics compensation subcomponent electric current phase it is identical.
The possible realization method of with reference to first aspect the first, in the third possible realization method of first aspect
In, the dump power according to each inverter is the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic
Subcomponent is compensated, including：
According toIt is retrieved as the reactive-load compensation subcomponent and each harmonic of each inverter distribution
The amplitude of the electric current of subcomponent is compensated, wherein, M is the sum of inverter,For the rated power of m platform inverters,For
The present output power of m platform inverters, 1≤m≤M and for integer are described as the i=1For the A phase nothings got
The amplitude of the electric current of work(compensation total amount, it is describedFor the width of the electric current of reactive-load compensation subcomponent for distributing to m platform inverters
Value, when i >=2 and for integer when, it is describedFor the amplitude of the electric current of the total component of A phase ith harmonic compensations got, institute
It statesFor the amplitude of the electric current of ith harmonic compensation subcomponent for distributing to m platform inverters；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The phase of stream,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent
Position, it is described as the i=1Represent the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents that gets, when the i >=
2 and for integer when, it is describedRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, all inverters
The phase of the electric current of the identical first harmonic compensation subcomponents of A is identical.
Second aspect, the embodiment of the present invention provide a kind of idle and harmonic compensation method, including：
The distribution instruction that controller is sent is received, the reactive-load compensation of inverter is distributed in the distribution instruction comprising controller
Subcomponent and each harmonic compensation subcomponent；
It is exported according to the reactive-load compensation subcomponent and each harmonic compensation subcomponent and the active power of inverter, really
The final output amount of the fixed inverter.
The third aspect, the embodiment of the present invention provide a kind of controller, including：
Sampling unit, for obtaining the voltage and current of exchange header box output point；
Control unit, for according to the voltage and current, obtaining the reactive-load compensation total amount of electric current and each harmonic compensation
Total component；
It is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each time are humorous that control unit, which is additionally operable to according to preset rules,
Wave compensates subcomponent, wherein, distribute to the reactive-load compensation subcomponent of all inverters and for the reactive-load compensation total amount, distribution
To the same first harmonic compensation subcomponent of all inverters and compensate total amount for the same first harmonic；
Communication unit, for sending distribution instruction to each inverter, the distribution instruction of each inverter includes distribution
Subcomponent is compensated to the reactive-load compensation subcomponent and each harmonic of the inverter.
With reference to the third aspect, in the first possible realization method of the third aspect, described control unit is specifically used for
Rated power according to each inverter is the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic compensation
Component；
Alternatively,
Dump power according to each inverter is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each time are humorous
Wave compensates subcomponent.
With reference to the first possible realization method of the third aspect, in second of possible realization method of the third aspect
In, described control unit is specifically used for
According to formula
It is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The amplitude of stream, wherein, M is the sum of inverter,For the rated power of m platform inverters, 1≤m≤M and it is integer, works as institute
It is described when stating i=1It is described for the amplitude of the electric current of A phase reactive-load compensation total amounts gotTo distribute to m platform inversions
The amplitude of the electric current of the reactive-load compensation subcomponent of device, when i >=2 and for integer when, it is describedFor the A phase iths got
The amplitude of the electric current of the total component of harmonic compensation, it is describedTo distribute to the ith harmonic compensation subcomponent of m platform inverters
The amplitude of electric current；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The phase of stream,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent
Position, it is described as the i=1Represent the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents that gets, when the i >=
2 and for integer when, it is describedRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, all inverters
The phase of the electric current of the identical first harmonic compensation subcomponents of A is identical.
With reference to the first possible realization method of the third aspect, in the third possible realization method of the third aspect
In, described control unit is specifically used for
According toIt is retrieved as the reactive-load compensation subcomponent and each harmonic of each inverter distribution
The amplitude of the electric current of subcomponent is compensated, wherein, M is the sum of inverter,For the rated power of m platform inverters,For
The present output power of m platform inverters, 1≤m≤M and for integer are described as the i=1For the A phase nothings got
The amplitude of the electric current of work(compensation total amount, it is describedFor the width of the electric current of reactive-load compensation subcomponent for distributing to m platform inverters
Value, when i >=2 and for integer when, it is describedFor the amplitude of the electric current of the total component of A phase ith harmonic compensations got, institute
It statesFor the amplitude of the electric current of ith harmonic compensation subcomponent for distributing to m platform inverters；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The phase of stream,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent
Position, it is described as the i=1Represent the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents that gets, when the i >=
2 and for integer when, it is describedRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, all inverters
The phase of the electric current of the identical first harmonic compensation subcomponents of A is identical.
Fourth aspect, the embodiment of the present invention provide a kind of inverter, including：
Receiving unit, for receiving the distribution instruction of controller transmission, the distribution instruction is distributed to inverse comprising controller
Become the reactive-load compensation subcomponent of device and each harmonic compensation subcomponent；
Processing unit, for being had according to the reactive-load compensation subcomponent and each harmonic compensation subcomponent and inverter
Work(power output determines the final output amount of the inverter.
5th aspect, the embodiment of the present invention provide a kind of idle and Harmonic-wave compensation system, including：Exchange header box, transformation
Device, M platforms inverter as claimed in claim 10, the M is more than or equal to 1 and is integer, such as any one of claim 6~9 institute
The controller stated, the input terminal of the inverter are connect with solar panel, and the output terminal of the inverter exchanges header box with described
Connection, it is described exchange header box output terminal connect with the input terminal of the transformer, the input terminal of the controller with it is described
The output terminal connection of header box is exchanged, the output terminal of the controller is connect respectively by communication bus with the M platforms inverter.
It is defeated to exchange header box by acquisition for provided in an embodiment of the present invention idle and harmonic compensation method, device and system
Go out voltage and current a little；According to the voltage and current, the reactive-load compensation total amount of electric current and each harmonic compensation total score are obtained
Amount；Subcomponent is compensated for the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic according to preset rules, wherein, point
All inverters of dispensing reactive-load compensation subcomponent and be the reactive-load compensation total amount, distributes to the same primary of all inverters
Harmonic compensation subcomponent and compensate total amount for the same first harmonic；Distribution instruction is sent to each inverter, it is each inverse
The distribution instruction for becoming device includes the reactive-load compensation subcomponent for distributing to the inverter and each harmonic compensation subcomponent, each inverse
Become device to be exported according to reactive-load compensation subcomponent and each harmonic compensation subcomponent and the active power of inverter, determine described inverse
Become the final output amount of device, that is, reactive-load compensation total amount is got by controller and each harmonic compensates total component, is then distributed
To each inverter, each inverter compensates having for subcomponent and inverter according to the reactive-load compensation subcomponent and each harmonic of distribution
Work(power output determines the final output amount of the inverter, so as to, idle and harmonic compensation is realized by inverter, without
Compensation equipment with high costs is added, therefore, reduces the construction cost of photovoltaic power station system.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the idle structure diagram with Harmonic-wave compensation system embodiment one of the present invention；
Fig. 2 is the idle flow diagram with harmonic compensation method embodiment one of the present invention；
Fig. 3 is the idle flow diagram with harmonic compensation method embodiment two of the present invention；
Fig. 4 is the structure diagram of controller embodiment one of the present invention；
Fig. 5 is the structure diagram of inverter embodiment one of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Term " first ", " second ", " third " " in description and claims of this specification and above-mentioned attached drawing
The (if present)s such as four " are the objects for distinguishing similar, and specific sequence or precedence are described without being used for.It should manage
The data that solution uses in this way can be interchanged in the appropriate case, so that the embodiment of the present invention described herein for example can be to remove
Sequence other than those for illustrating or describing herein is implemented.In addition, term " comprising " and " having " and theirs is any
Deformation, it is intended that cover it is non-exclusive include, for example, containing the process of series of steps or unit, method, system, production
Product or equipment are not necessarily limited to those steps or unit clearly listed, but may include not listing clearly or for this
The intrinsic other steps of processes, method, product or equipment or unit a bit.
The present invention obtains the voltage and current of exchange header box output point by controller, according to voltage and current, obtains
The reactive-load compensation total amount and each harmonic of electric current compensate total component, when the active power of inverter output is less than the overload of inverter
During ability, carry out reactive-load compensation subcomponent using the ability of the remaining output power of inverter and each harmonic compensates subcomponent
Output, the ability of the remaining output power of inverter according toWherein, S is apparent energy, and P is exported for inverter
Active power, Q be the remaining output power of inverter ability, controller according to preset rules for each inverter distribution correspondence
Reactive-load compensation subcomponent and each harmonic compensation subcomponent, each inverter compensated according to reactive-load compensation subcomponent and each harmonic
Subcomponent and the output of the active power of inverter determine the final output amount of the inverter, so as to realize idle and harmonic wave
Compensation, without adding compensation equipment with high costs, therefore, reduces the construction cost of photovoltaic power station system.Also, due to control
The volume very little of device, saves space.
Technical scheme of the present invention is described in detail with specifically embodiment below.These specific implementations below
Example can be combined with each other, and the same or similar concept or process may be repeated no more in some embodiments.
Fig. 1 is the idle structure diagram with Harmonic-wave compensation system embodiment one of the present invention, as shown in Figure 1, the present embodiment
System include M platform inverters, the M is more than or equal to 1 and for integer, and the input terminal of every inverter is connect with solar panel, inverse
The output terminal for becoming device is connect with exchange header box, and the input terminal of output terminal and transformer for exchanging header box connects, controller
Input terminal is connect with exchanging the output terminal of header box, and the output terminal of controller is connect respectively by communication bus with M platforms inverter.
The direct current energy of solar panel is converted into alternating current by inverter, and the electricity of all inverter outputs is converged by exchange header box
Collection carries out being output to medium voltage network output after transformation by transformer, and the line on the controller input terminal left side exchanges for obtaining
The electric current of header box output point, line on the right of controller input terminal is for obtaining the voltage of exchange header box output point, controller
According to voltage and current, the reactive-load compensation total amount and each harmonic for obtaining electric current compensate total component, are each inverse according to preset rules
Become device and distribute corresponding reactive-load compensation subcomponent and each harmonic compensation subcomponent.Inverter is according to reactive-load compensation subcomponent and respectively
Subharmonic compensation subcomponent carries out idle and harmonic compensation.
Controller in Fig. 1 can realize the function of each unit of following Fig. 4 shown devices embodiments, can perform following Fig. 2
The technical solution of shown embodiment of the method, the inverter in Fig. 1 can realize the work(of each unit of following Fig. 3 shown devices embodiments
Can, the technical solution of embodiment of the method shown in following Fig. 5 is can perform, refers to description below.
Fig. 2 is the idle flow diagram with harmonic compensation method embodiment one of the present invention, and the present embodiment is by the control in Fig. 1
Device processed performs, as shown in Fig. 2, the method for the present embodiment is as follows：
S201：Obtain the voltage and current of exchange header box output point.
Specifically refer to obtain the voltage and current of the exchange header box output point of a power frequency period, usually from A phase zero passages
Point starts, and obtains frequency and is generally the 2 of power frequencyNTimes, N is generally 8 or 9 or 10.Such as：For the power frequency of 50Hz, then frequency is obtained
Rate is generally 50*256 or 50*512.
In Fig. 1, the input line of close exchange header box output point being connect with controller is for acquiring three-phase current, i.e.,
A phase currents, B phase currents and C phase currents；Another input line being connect with controller is used to acquire three-phase voltage.
S202：According to voltage and current, the reactive-load compensation total amount and each harmonic for obtaining electric current compensate total component.
Using discrete Fourier transform (Discrete Fourier Transform, abbreviation：DFT) in algorithm or quick Fu
Leaf transformation (Fast Fourier Transform, referred to as：FFT) algorithm obtains the reactive-load compensation total amount of electric current and each harmonic is mended
Total component is repaid, more specifically, being the amplitude for the electric current for obtaining reactive-load compensation total amount and phase and to obtain each harmonic compensation total
The amplitude and phase of the electric current of component.
S203：It is the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic compensation son point according to preset rules
Amount.
Wherein, it distributes to the reactive-load compensation subcomponent of all inverters and for the reactive-load compensation total amount, distributes to institute
There is the same first harmonic compensation subcomponent of inverter and compensate total amount for the same first harmonic.
The mode that subcomponent is compensated for the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic is included but not
It is limited to：
Because voltage is identical, each inverter distribution reactive-load compensation subcomponent and each harmonic compensation can be assigned as according to three-phase
The electric current and phase of component；
Alternatively,
The equivalent of reactive-load compensation subcomponent and the equivalent of each harmonic compensation subcomponent are distributed, equivalent can pass through phase
The coordinate answered is rotationally-varying to be obtained；
Alternatively,
Distribute reactive-load compensation subcomponent and each harmonic compensation subcomponent, i.e., direct distribution power.
To be assigned as the electric current of each inverter distribution reactive-load compensation subcomponent and each harmonic compensation subcomponent according to three-phase
It is described with for phase：
A phase partitionings are carried out, is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic compensate subcomponent, is
Refer to and the amplitude of the electric current of A phase reactive-load compensation total amounts is distributed into each inverter, by the phase of the electric current of A phase reactive-load compensation total amounts point
The amplitude of the electric current of the total component of A phase ith harmonic compensations is distributed to each inverter by each inverter of dispensing, and A phase iths is humorous
Wave compensates the phase assignments of the electric current of total component to each inverter.
Preset rules include but not limited to following two possible realization methods：
Wherein, the first possible realization method is：Rated power according to each inverter is each inverter distribution
Corresponding reactive-load compensation subcomponent and each harmonic compensation subcomponent.
Specifically：
According to formula
It is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The amplitude of stream, wherein, M is the sum of inverter,For the rated power of m platform inverters, 1≤m≤M and it is integer, works as institute
It is described when stating i=1It is described for the amplitude of the electric current of A phase reactive-load compensation total amounts gotTo distribute to m platform inversions
The amplitude of the electric current of the reactive-load compensation subcomponent of device, when i >=2 and for integer when, it is describedFor the A phase iths got
The amplitude of the electric current of the total component of harmonic compensation, it is describedTo distribute to the ith harmonic compensation subcomponent of m platform inverters
The amplitude of electric current；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The phase of stream,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent
Position, it is described as the i=1Represent the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents that gets, when the i >=
2 and for integer when, it is describedRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, all inverters
A identical first harmonics compensation subcomponent electric current phase it is identical.
Second of possible realization method be：It is corresponding for each inverter distribution according to the dump power of each inverter
Reactive-load compensation subcomponent and each harmonic compensation subcomponent.Dump power refers to that rated power subtracts the power currently exported.
Specifically,
According toIt is retrieved as the reactive-load compensation subcomponent and each harmonic of each inverter distribution
The amplitude of the electric current of subcomponent is compensated, wherein, M is the sum of inverter,For the rated power of m platform inverters,It is
The present output power of m platform inverters, 1≤m≤M and for integer are described as the i=1A phases to get are idle
The amplitude of the electric current of total amount is compensated, it is describedFor the amplitude of the electric current of reactive-load compensation subcomponent for distributing to m platform inverters,
When i >=2 and for integer when, it is describedIt is described for the amplitude of the electric current of the total component of A phase ith harmonic compensations gotFor the amplitude of the electric current of ith harmonic compensation subcomponent for distributing to m platform inverters；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The phase of stream,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent,
It is described as the i=1Represent the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents that gets, when i >=2 and
It is described during for integerRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, the A phases of all inverters
It is identical with the phase of the electric current of first harmonic compensation subcomponent.
It carries out B phase partitionings and progress C coordinating fashions is similar with A, details are not described herein again.
S204：To inverter transmission distribution instruction, the distribution instruction of each inverter, which includes, distributes to the idle of inverter
Compensate subcomponent and each harmonic compensation subcomponent.
Each inverter receives the distribution instruction that controller is sent, and the nothing of inverter is distributed in distribution instruction comprising controller
Work(compensates subcomponent and each harmonic compensation subcomponent；According to reactive-load compensation subcomponent and each harmonic compensation subcomponent and inverse
Become the active power output of device, determine the final output amount of inverter.
The present embodiment exchanges the voltage and current of header box output point by acquisition；According to the voltage and current, obtain
The reactive-load compensation total amount and each harmonic of electric current compensate total component；It is the corresponding idle benefit of each inverter distribution according to preset rules
Subcomponent and each harmonic compensation subcomponent are repaid, wherein, it distributes to the reactive-load compensation subcomponent of all inverters and is described
Reactive-load compensation total amount is distributed to the same first harmonic compensation subcomponent of all inverters and is compensated for the same first harmonic total
Amount；To each inverter transmission distribution instruction, the distribution instruction of each inverter, which includes, distributes to the idle of the inverter
Subcomponent and each harmonic compensation subcomponent are compensated, each inverter is according to reactive-load compensation subcomponent and each harmonic compensation son point
Amount and the output of the active power of inverter determine the final output amount of the inverter, that is, got by controller idle
It compensates total amount and each harmonic compensates total component, be then assigned to each inverter, each inverter is sub according to the reactive-load compensation of distribution
The active power output of component and each harmonic compensation subcomponent and inverter determines the final output amount of the inverter,
So as to realize idle and harmonic compensation by inverter, without adding compensation equipment with high costs, therefore, reduce photovoltaic electric
The construction cost for system of standing.The present invention can accurately determine the harmonic wave of arbitrary subharmonic compensation total amount and each inverter distribution
Compensate subcomponent.
Fig. 3 is the idle flow diagram with harmonic compensation method embodiment two of the present invention, and the present embodiment is by inverse in Fig. 1
Become device to perform, as shown in figure 3, the method for the present embodiment is as follows：
S301：The distribution instruction that controller is sent is received, the idle benefit of inverter is distributed in distribution instruction comprising controller
Repay subcomponent and each harmonic compensation subcomponent.
S302：It is defeated according to the reactive-load compensation subcomponent and each harmonic compensation subcomponent and the active power of inverter
Go out, determine the final output amount of the inverter.
The present embodiment, the distribution that controller transmission is received by inverter instruct, and distribution instruction is distributed to comprising controller
Reactive-load compensation subcomponent and each harmonic the compensation subcomponent of inverter, are mended according to the reactive-load compensation subcomponent and each harmonic
The active power output of subcomponent and inverter is repaid, determines the final output amount of the inverter.So as to which realization passes through inversion
Device carries out idle and harmonic compensation, without adding compensation equipment with high costs, therefore, reduce the construction of photovoltaic power station system into
This.
Fig. 4 is the structure diagram of controller embodiment one of the present invention, as shown in figure 4, the control of the present embodiment includes adopting
Sample unit 401, control unit 402 and communication unit 403, wherein, header box output point is exchanged for obtaining using unit 401
Voltage and current；Control unit 402 is used for according to the voltage and current, obtains the reactive-load compensation total amount and each harmonic of electric current
Compensate total component；Control unit 402 be additionally operable to according to preset rules as the corresponding reactive-load compensation subcomponent of each inverter distribution and
Each harmonic compensate subcomponent, wherein, distribute to the reactive-load compensation subcomponent of all inverters and for the reactive-load compensation it is total
Amount distributes to the same first harmonic compensation subcomponent of all inverters and compensates total amount for the same first harmonic；Communication is single
For member 403 for sending distribution instruction to each inverter, the distribution instruction of each inverter, which includes, distributes to the inverter
Reactive-load compensation subcomponent and each harmonic compensation subcomponent；It is additionally operable to read the state and data of each inverter.
In the above-described embodiments, it is described each that described control unit 402, which is specifically used for according to the rated power of each inverter,
The corresponding reactive-load compensation subcomponent of inverter distribution and each harmonic compensation subcomponent；
Alternatively, it is the corresponding reactive-load compensation subcomponent of each inverter distribution and each according to the dump power of each inverter
Subharmonic compensates subcomponent.
In the above-described embodiments, described control unit 402 is specifically used for according to formula
It is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The amplitude of stream, wherein, M is the sum of inverter,For the rated power of m platform inverters, 1≤m≤M and it is integer, works as institute
It is described when stating i=1It is described for the amplitude of the electric current of A phase reactive-load compensation total amounts gotTo distribute to m platform inversions
The amplitude of the electric current of the reactive-load compensation subcomponent of device, when i >=2 and for integer when, it is describedFor the A phase iths got
The amplitude of the electric current of the total component of harmonic compensation, it is describedElectricity for the ith harmonic compensation subcomponent for distributing to m platform inverters
The amplitude of stream；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The phase of stream,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent
Position, it is described as the i=1Represent the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents that gets, when the i >=
2 and for integer when, it is describedRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, all inverters
The phase of the electric current of the identical first harmonic compensation subcomponents of A is identical.
In the above-described embodiments, described control unit 402 is specifically used for basisIt is retrieved as
The amplitude of the electric current of reactive-load compensation subcomponent and each harmonic the compensation subcomponent of each inverter distribution, wherein, M is inverter
Sum,For the rated power of m platform inverters,For the present output power of m platform inverters, 1≤m≤M and it is whole
Number, it is described as the i=1It is described for the amplitude of the electric current of A phase reactive-load compensation total amounts gotTo distribute to m
The amplitude of the electric current of the reactive-load compensation subcomponent of platform inverter, when i >=2 and for integer when, it is describedFor the A phases got
The amplitude of the electric current of the total component of ith harmonic compensation, it is describedTo distribute to ith harmonic compensation point of m platform inverters
The amplitude of the electric current of amount；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electricity of each harmonic compensation subcomponent
The phase of stream,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent,
It is described as the i=1Represent the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents that gets, when i >=2 and
It is described during for integerRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, the A phases of all inverters
It is identical with the phase of the electric current of first harmonic compensation subcomponent.
Controller shown in Fig. 4 further includes power supply unit, the power supply unit can be built in controller or
External power supply unit, it is separately positioned with controller, in this regard, the present invention is not restricted.
The each unit of Fig. 4 shown device embodiments can be used for performing the technical solution of embodiment of the method shown in Fig. 2, realize
Principle is similar with technique effect, and details are not described herein again.
Fig. 5 is the structure diagram of inverter embodiment one of the present invention, as shown in figure 5, the inverter of the present embodiment includes
Receiving unit 501 and processing unit 502, wherein, the distribution that receiving unit 501 is used to receive controller transmission instructs, described point
With instruction the reactive-load compensation subcomponent of inverter and each harmonic compensation subcomponent are distributed to comprising controller；Processing unit 502
For being exported according to the reactive-load compensation subcomponent and each harmonic compensation subcomponent and the active power of inverter, institute is determined
State the final output amount of inverter.
The each unit of Fig. 5 shown device embodiments can be used for performing the technical solution of embodiment of the method shown in Fig. 3, realize
Principle is similar with technique effect, and details are not described herein again.
The described methods, devices and systems of the various embodiments described above of the present invention apply also for centralized inverter composition
Photovoltaic power station system.In the photovoltaic power station system of centralized inverter composition, comprising two inverters, for example, two
The inverter of 500kW can form the photovoltaic power station system of a 1MW.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Aforementioned program can be stored in a computer read/write memory medium.The journey
Sequence when being executed, performs the step of including above-mentioned each method embodiment；And aforementioned storage medium includes：ROM, RAM, magnetic disc or
The various media that can store program code such as person's CD.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into
Row equivalent replacement；And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (9)
1. a kind of idle and harmonic compensation method, which is characterized in that including：
Obtain the voltage and current of exchange header box output point；
According to the voltage and current, the reactive-load compensation total amount and each harmonic for obtaining electric current compensate total component；
Subcomponent is compensated for the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic according to preset rules, wherein,
It distributes to the reactive-load compensation subcomponent of all inverters and for the reactive-load compensation total amount, distributes to the same of all inverters
Subharmonic compensation subcomponent and compensate total amount for the same first harmonic；
To each inverter transmission distribution instruction, the distribution instruction of each inverter, which includes, distributes to the idle of the inverter
Compensate subcomponent and each harmonic compensation subcomponent；
Wherein, it is described to divide according to preset rules for the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic compensation
Amount, including：
Rated power according to each inverter is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic are mended
Repay subcomponent；
Alternatively,
Dump power according to each inverter is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic are mended
Repay subcomponent.
2. according to the method described in claim 1, it is characterized in that, the rated power according to each inverter is described each inverse
Become device and distribute corresponding reactive-load compensation subcomponent and each harmonic compensation subcomponent, including：
According to formula
It is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent
Amplitude, wherein, M is the sum of inverter,For the rated power of m platform inverters, 1≤m≤M and it is integer, as the i=
It is described when 1It is described for the amplitude of the electric current of A phase reactive-load compensation total amounts gotTo distribute to the nothing of m platform inverters
Work(compensation subcomponent electric current amplitude, when i >=2 and for integer when, it is describedA phase iths harmonic wave to get is mended
The amplitude of the electric current of total component is repaid, it is describedFor the electric current of ith harmonic compensation subcomponent of distributing to m platform inverters
Amplitude；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent
Phase,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent, when
It is described during the i=1It represents the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents got, when i >=2 and is
It is described during integerRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, the A of all inverters is identical
The phase of the electric current of first harmonic compensation subcomponent is identical.
3. according to the method described in claim 1, it is characterized in that, the dump power according to each inverter is described each inverse
Become device and distribute corresponding reactive-load compensation subcomponent and each harmonic compensation subcomponent, including：
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and each harmonic compensation
The amplitude of the electric current of subcomponent, wherein, M is the sum of inverter,For the rated power of m platform inverters,For m platforms
The present output power of inverter, 1≤m≤M and for integer are described as the i=1For the A phase reactive-load compensations got
The amplitude of the electric current of total amount, it is describedFor the amplitude of the electric current of reactive-load compensation subcomponent for distributing to m platform inverters, work as institute
State i >=2 and for integer when, it is describedIt is described for the amplitude of the electric current of the total component of A phase ith harmonic compensations gotFor
Distribute to the amplitude of the electric current of the ith harmonic compensation subcomponent of m platform inverters；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent
Phase,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent, when
It is described during the i=1It represents the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents got, when i >=2 and is
It is described during integerRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, the A of all inverters is identical
The phase of the electric current of first harmonic compensation subcomponent is identical.
4. a kind of idle and harmonic compensation method, which is characterized in that including：
The distribution instruction that controller is sent is received, the reactive-load compensation son point of inverter is distributed in the distribution instruction comprising controller
Amount and each harmonic compensate subcomponent；
It is exported according to the reactive-load compensation subcomponent and each harmonic compensation subcomponent and the active power of inverter, determines institute
State the final output amount of inverter；
Wherein, the controller is corresponding reactive-load compensation point of each inverter distribution according to the rated power of each inverter
Amount and each harmonic compensate subcomponent；
Alternatively,
The controller according to the dump power of each inverter for the corresponding reactive-load compensation subcomponent of each inverter distribution and
Each harmonic compensates subcomponent.
5. a kind of controller, which is characterized in that including：
Sampling unit, for obtaining the voltage and current of exchange header box output point；
Control unit, for according to the voltage and current, obtaining the reactive-load compensation total amount of electric current and each harmonic compensation total score
Amount；
It is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each time are humorous that described control unit, which is additionally operable to according to preset rules,
Wave compensates subcomponent, wherein, distribute to the reactive-load compensation subcomponent of all inverters and for the reactive-load compensation total amount, distribution
To the same first harmonic compensation subcomponent of all inverters and compensate total amount for the same first harmonic；
Communication unit, for sending distribution instruction to each inverter, the distribution instruction of each inverter, which includes, distributes to institute
State the reactive-load compensation subcomponent of inverter and each harmonic compensation subcomponent；
Wherein, described control unit is specifically used for
Rated power according to each inverter is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic are mended
Repay subcomponent；
Alternatively,
Dump power according to each inverter is that the corresponding reactive-load compensation subcomponent of each inverter distribution and each harmonic are mended
Repay subcomponent.
6. controller according to claim 5, which is characterized in that described control unit is specifically used for according to formula
It is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent
Amplitude, wherein, M is the sum of inverter,For the rated power of m platform inverters, 1≤m≤M and it is integer, as the i
It is described when=1It is described for the amplitude of the electric current of A phase reactive-load compensation total amounts gotTo distribute to m platform inverters
The amplitude of the electric current of reactive-load compensation subcomponent, when i >=2 and for integer when, it is describedFor the A phase ith harmonic waves got
The amplitude of the electric current of total component is compensated, it is describedElectric current for the ith harmonic compensation subcomponent for distributing to m platform inverters
Amplitude；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent
Phase,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent, when
It is described during the i=1It represents the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents got, when i >=2 and is
It is described during integerRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, the A of all inverters is identical
The phase of the electric current of first harmonic compensation subcomponent is identical.
7. controller according to claim 5, which is characterized in that described control unit is specifically used for
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and each harmonic compensation
The amplitude of the electric current of subcomponent, wherein, M is the sum of inverter,For the rated power of m platform inverters,For m platforms
The present output power of inverter, 1≤m≤M and for integer are described as the i=1For the A phase reactive-load compensations got
The amplitude of the electric current of total amount, it is describedFor the amplitude of the electric current of reactive-load compensation subcomponent for distributing to m platform inverters, work as institute
State i >=2 and for integer when, it is describedIt is described for the amplitude of the electric current of the total component of A phase ith harmonic compensations gotFor
Distribute to the amplitude of the electric current of the ith harmonic compensation subcomponent of m platform inverters；
According toIt is retrieved as the reactive-load compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent
Phase,Reactive-load compensation subcomponent and each harmonic for m platform inverter distributions compensate the phase of the electric current of subcomponent, when
It is described during the i=1It represents the phase of reactive-load compensation A phase reactive-load compensation total amount electric currents got, when i >=2 and is
It is described during integerRepresent the phase of the electric current of the total component of A phase ith harmonic compensations got, the A of all inverters is identical
The phase of the electric current of first harmonic compensation subcomponent is identical.
8. a kind of inverter, which is characterized in that including：
Receiving unit, for receiving the distribution instruction of controller transmission, the distribution instruction distributes to inverter comprising controller
Reactive-load compensation subcomponent and each harmonic compensation subcomponent；
Processing unit, for according to the reactive-load compensation subcomponent and the wattful power of each harmonic compensation subcomponent and inverter
Rate exports, and determines the final output amount of the inverter；
Wherein, the controller is corresponding reactive-load compensation point of each inverter distribution according to the rated power of each inverter
Amount and each harmonic compensate subcomponent；
Alternatively,
The controller according to the dump power of each inverter for the corresponding reactive-load compensation subcomponent of each inverter distribution and
Each harmonic compensates subcomponent.
9. a kind of idle and Harmonic-wave compensation system, which is characterized in that including：Exchange header box, transformer, M platforms such as claim 8
The inverter, the M is more than or equal to 1 and is integer, such as claim 5~7 any one of them controller, the inversion
The input terminal of device is connect with solar panel, and the output terminal of the inverter is connect with the exchange header box, the exchange header box
Output terminal connect with the input terminal of the transformer, the input terminal of the controller and it is described exchange header box output terminal connect
It connects, the output terminal of the controller is connect respectively by communication bus with the M platforms inverter.
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| CN108233388B (en) * | 2016-12-14 | 2020-10-23 | 北京天诚同创电气有限公司 | Working mode control method and device of modular inverter |
| CN107332245A (en) * | 2017-08-29 | 2017-11-07 | 云南电力试验研究院(集团)有限公司 | A kind of harmonic wave and idle administering method |
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