CN104917181A - Reactive and harmonic wave compensation method, device and system - Google Patents
Reactive and harmonic wave compensation method, device and system Download PDFInfo
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- CN104917181A CN104917181A CN201510374420.0A CN201510374420A CN104917181A CN 104917181 A CN104917181 A CN 104917181A CN 201510374420 A CN201510374420 A CN 201510374420A CN 104917181 A CN104917181 A CN 104917181A
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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
Abstract
An embodiment of the invention provides a reactive and harmonic wave compensation method, device and system. The method includes acquiring voltage and current of an AC combiner box output point; acquiring reactive compensation total amount and compensation total component of harmonic waves of all orders according to the voltage and current; distributing corresponding reactive compensation sub components and compensation sub components harmonic waves of all orders for inverters according to a preset rule, wherein the sum of the reactive compensation sub components distributed to all the inverters is the reactive compensation total amount and the sum of compensation sub components of harmonic waves of the same order is the compensation total amount of harmonic waves of the same order; distributing instructions to the inverters, wherein the instructions include reactive compensation sub components and compensation sub components of harmonic waves of all orders distributed to the inverters and each inverter determines the final output volume according to the reactive compensation sub components and compensation sub components of harmonic waves of all orders and the active power output of the inverters. Therefore, construction cost of a photovoltaic power station system is reduced.
Description
Technical field
The embodiment of the present invention relates to power technology, particularly relates to a kind of idle and harmonic compensation method, device and system.
Background technology
In electric power system, there is very large harm in idle and harmonic wave.As: idle meeting causes line loss to increase, and harmonic wave can cause electrical equipment fault etc.Therefore, idle in electric power system construction and harmonic compensation is the problem that must consider.
In photovoltaic power station system, each cell panel is connected with an inverter, inverter converts the direct current energy of cell panel to alternating current, the electricity that all inverters export collects through exchanging header box, output to medium voltage network after carrying out transformation by transformer to export, but, because inverter can produce harmonic wave in transfer process, and, electrical network exports and produces reactive power, therefore, need to carry out idle and harmonic compensation, in prior art, by increasing capacitor compensation cabinet between interchange header box and transformer, carry out reactive power compensation, to reduce the loss of electrical network outlet line, improve power supplying efficiency.
But adopt such scheme, the cost of capacitor compensation cabinet is higher, increase the construction cost of photovoltaic power station system.
Summary of the invention
The embodiment of the present invention provides a kind of idle and harmonic compensation method, device and system, to reduce the construction cost of photovoltaic power station system.
First aspect, the embodiment of the present invention provides a kind of idle and harmonic compensation method, comprising:
Obtain the voltage and current exchanging header box output point;
According to described voltage and current, the reactive power compensation total amount and each harmonic that obtain electric current compensate total component;
Be that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, wherein, distribute to the reactive power compensation subcomponent of all inverters and be described reactive power compensation total amount, that the same first harmonic distributing to all inverters compensates subcomponent and compensate total amount for described same first harmonic;
Send distribution instruction to described each inverter, the distribution instruction of each inverter comprises the reactive power compensation subcomponent and each harmonic compensation subcomponent of distributing to described inverter.
In conjunction with first aspect, in the first possible implementation of first aspect, described is that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, comprising:
Be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the rated power of each inverter;
Or,
Be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the dump power of each inverter.
In conjunction with the first possible implementation of first aspect, in the implementation that the second of first aspect is possible, the described rated power according to each inverter is that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent, comprising:
According to formula
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
In conjunction with the first possible implementation of first aspect, in the third possible implementation of first aspect, the described dump power according to each inverter is that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent, comprising:
According to
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter,
be the present output power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
Second aspect, the embodiment of the present invention provides a kind of idle and harmonic compensation method, comprising:
Receive the distribution instruction that controller sends, described distribution instruction comprises reactive power compensation subcomponent and each harmonic compensation subcomponent that inverter distributed to by controller;
The active power compensating subcomponent and inverter according to described reactive power compensation subcomponent and each harmonic exports, and determines the final output variable of described inverter.
The third aspect, the embodiment of the present invention provides a kind of controller, comprising:
Sampling unit, for obtaining the voltage and current exchanging header box output point;
Control unit, for according to described voltage and current, the reactive power compensation total amount and each harmonic that obtain electric current compensate total component;
Control unit is also for being that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, wherein, distribute to the reactive power compensation subcomponent of all inverters and be described reactive power compensation total amount, that the same first harmonic distributing to all inverters compensates subcomponent and compensate total amount for described same first harmonic;
Communication unit, for sending distribution instruction to described each inverter, the distribution instruction of each inverter comprises the reactive power compensation subcomponent and each harmonic compensation subcomponent of distributing to described inverter.
In conjunction with the third aspect, in the first possible implementation of the third aspect, described control unit is specifically for being that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the rated power of each inverter;
Or,
Be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the dump power of each inverter.
In conjunction with the first possible implementation of the third aspect, in the implementation that the second of the third aspect is possible, described control unit specifically for
According to formula
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
In conjunction with the first possible implementation of the third aspect, in the third possible implementation of the third aspect, described control unit specifically for
According to
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter,
be the present output power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
Fourth aspect, the embodiment of the present invention provides a kind of inverter, comprising:
Receiving element, for receiving the distribution instruction that controller sends, described distribution instruction comprises reactive power compensation subcomponent and each harmonic compensation subcomponent that inverter distributed to by controller;
Processing unit, exports for the active power compensating subcomponent and inverter according to described reactive power compensation subcomponent and each harmonic, determines the final output variable of described inverter.
5th aspect, the embodiment of the present invention provides a kind of idle and Harmonic-wave compensation system, comprise: exchange header box, transformer, M platform inverter as claimed in claim 10, described M is more than or equal to 1 and is integer, controller as described in any one of claim 6 ~ 9, the input of described inverter is connected with cell panel, the output of described inverter is connected with described interchange header box, the output of described interchange header box is connected with the input of described transformer, the input of described controller is connected with the output of described interchange header box, the output of described controller is connected with described M platform inverter respectively by communication bus.
Idle and harmonic compensation method, device and system that the embodiment of the present invention provides, by obtaining the voltage and current exchanging header box output point, according to described voltage and current, the reactive power compensation total amount and each harmonic that obtain electric current compensate total component, be that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, wherein, distribute to the reactive power compensation subcomponent of all inverters and be described reactive power compensation total amount, that the same first harmonic distributing to all inverters compensates subcomponent and compensate total amount for described same first harmonic, distribution instruction is sent to described each inverter, the distribution instruction of each inverter comprises the reactive power compensation subcomponent and each harmonic compensation subcomponent of distributing to described inverter, the active power that each inverter compensates subcomponent and inverter according to reactive power compensation subcomponent and each harmonic exports, determine the final output variable of described inverter, namely, reactive power compensation total amount is got and each harmonic compensates total component by controller, then each inverter is distributed to, the active power that each inverter compensates subcomponent and inverter according to the reactive power compensation subcomponent of distributing and each harmonic exports, determine the final output variable of described inverter, thus, idle and harmonic compensation is realized by inverter, without the need to adding compensation equipment with high costs, therefore, reduce the construction cost of photovoltaic power station system.
Term " first ", " second ", " the 3rd " " 4th " etc. (if existence) in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein such as can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
The present invention obtains the voltage and current exchanging header box output point by controller, according to voltage and current, the reactive power compensation total amount and each harmonic that obtain electric current compensate total component, when the active power that inverter exports is less than the overload capacity of inverter, utilize the ability of the remaining power output of inverter to carry out output that reactive power compensation subcomponent and each harmonic compensate subcomponent, the ability of the remaining power output of inverter according to
wherein, S is apparent power, P is the active power that inverter exports, Q is the ability of the remaining power output of inverter, controller is that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, the active power that each inverter compensates subcomponent and inverter according to reactive power compensation subcomponent and each harmonic exports, determine the final output variable of described inverter, thus, realize idle and harmonic compensation, without the need to adding compensation equipment with high costs, therefore, the construction cost of photovoltaic power station system is reduced.Further, because the volume of controller is very little, space is saved.
With embodiment particularly, technical scheme of the present invention is described in detail below.These specific embodiments can be combined with each other below, may repeat no more for same or analogous concept or process in some embodiment.
Fig. 1 is the structural representation of the idle and Harmonic-wave compensation system embodiment one of the present invention, as shown in Figure 1, the system of the present embodiment comprises M platform inverter, described M is more than or equal to 1 and is integer, the input of every platform inverter is connected with cell panel, and the output of inverter is connected with interchange header box, exchanges the output of header box and is connected with the input of transformer, the input of controller is connected with the output exchanging header box, and the output of controller is connected with M platform inverter respectively by communication bus.Inverter converts the direct current energy of cell panel to alternating current, the electricity that all inverters export collects through exchanging header box, output to medium voltage network after carrying out transformation by transformer to export, the line on the controller input left side is for obtaining the electric current exchanging header box output point, line on the right of controller input exchanges the voltage of header box output point for obtaining, controller is according to voltage and current, the reactive power compensation total amount and each harmonic that obtain electric current compensate total component, be that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules.Inverter compensates subcomponent according to reactive power compensation subcomponent and each harmonic and carries out idle and harmonic compensation.
Controller in Fig. 1 can realize the function of each unit of following Fig. 4 shown device embodiment, the technical scheme of embodiment of the method shown in following Fig. 2 can be performed, inverter in Fig. 1 can realize the function of each unit of following Fig. 3 shown device embodiment, the technical scheme of embodiment of the method shown in following Fig. 5 can be performed, refer to description below.
Fig. 2 is the schematic flow sheet of the idle and harmonic compensation method embodiment one of the present invention, and the present embodiment is performed by the controller in Fig. 1, and as shown in Figure 2, the method for the present embodiment is as follows:
S201: obtain the voltage and current exchanging header box output point.
Specifically refer to the voltage and current of the interchange header box output point of an acquisition power frequency period, usually from A phase zero crossing, obtain frequency and be generally 2 of power frequency
ndoubly, N is generally 8 or 9 or 10.Such as: for the power frequency of 50Hz, then obtain frequency and be generally 50*256 or 50*512.
In FIG, be connected with controller near exchanging the input line of header box output point for gathering three-phase current, i.e. A phase current, B phase current and C phase current; Another root input line be connected with controller is for gathering three-phase voltage.
S202: according to voltage and current, the reactive power compensation total amount and each harmonic that obtain electric current compensate total component.
Adopt discrete Fourier transform (Discrete Fourier Transform, be called for short: DFT) algorithm or fast Fourier transform (Fast Fourier Transform, be called for short: FFT) algorithm obtains the reactive power compensation total amount of electric current and each harmonic compensates total component, more specifically, be amplitude and the phase place of the electric current obtaining reactive power compensation total amount, and obtain amplitude and phase place that each harmonic compensates the electric current of total component.
S203: be that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules.
Wherein, distribute to the reactive power compensation subcomponent of all inverters and be described reactive power compensation total amount, that the same first harmonic distributing to all inverters compensates subcomponent and compensate total amount for described same first harmonic.
The mode that the reactive power compensation subcomponent corresponding for each inverter distribution and each harmonic compensate subcomponent includes but not limited to:
Because voltage is identical, electric current and the phase place of each inverter distribution reactive power compensation subcomponent and each harmonic compensation subcomponent can be assigned as according to three-phase;
Or,
Distribute the equivalent of reactive power compensation subcomponent and the equivalent of each harmonic compensation subcomponent, equivalent obtains by corresponding rotation of coordinate change;
Or,
Distribute reactive power compensation subcomponent and each harmonic compensation subcomponent, namely directly distribute power.
Be described for the electric current and phase place that are assigned as each inverter distribution reactive power compensation subcomponent and each harmonic compensation subcomponent according to three-phase:
Carry out A phase partitioning, the reactive power compensation subcomponent corresponding for each inverter distribution and each harmonic compensate subcomponent, refer to and the amplitude of the electric current of A phase reactive power compensation total amount is distributed to each inverter, each inverter is given by the phase assignments of the electric current of A phase reactive power compensation total amount, the amplitude that A phase i-th subharmonic compensates the electric current of total component is distributed to each inverter, A phase i-th subharmonic is compensated the phase assignments of the electric current of total component to each inverter.
Preset rules includes but not limited to following two kinds of possible implementations:
Wherein, the first possible implementation is: be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the rated power of each inverter.
Particularly:
According to formula
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
The possible implementation of the second is: be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the dump power of each inverter.Dump power refers to that rated power deducts the power of current output.
Particularly,
According to
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter,
be the present output power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
Carry out B phase partitioning and carry out C coordinating fashion and A similar, repeat no more herein.
S204: send distribution instruction to inverter, the distribution instruction of each inverter comprises the reactive power compensation subcomponent and each harmonic compensation subcomponent of distributing to inverter.
Each inverter receives the distribution instruction that controller sends, and distribution instruction comprises reactive power compensation subcomponent and each harmonic compensation subcomponent that inverter distributed to by controller; The active power compensating subcomponent and inverter according to reactive power compensation subcomponent and each harmonic exports, and determines the final output variable of inverter.
The present embodiment, by obtaining the voltage and current exchanging header box output point, according to described voltage and current, the reactive power compensation total amount and each harmonic that obtain electric current compensate total component, be that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, wherein, distribute to the reactive power compensation subcomponent of all inverters and be described reactive power compensation total amount, that the same first harmonic distributing to all inverters compensates subcomponent and compensate total amount for described same first harmonic, distribution instruction is sent to described each inverter, the distribution instruction of each inverter comprises the reactive power compensation subcomponent and each harmonic compensation subcomponent of distributing to described inverter, the active power that each inverter compensates subcomponent and inverter according to reactive power compensation subcomponent and each harmonic exports, determine the final output variable of described inverter, namely, reactive power compensation total amount is got and each harmonic compensates total component by controller, then each inverter is distributed to, the active power that each inverter compensates subcomponent and inverter according to the reactive power compensation subcomponent of distributing and each harmonic exports, determine the final output variable of described inverter, thus, idle and harmonic compensation is realized by inverter, without the need to adding compensation equipment with high costs, therefore, reduce the construction cost of photovoltaic power station system.The present invention accurately can determine that any subharmonic compensates total amount, and the harmonic compensation subcomponent of each inverter distribution.
Fig. 3 is the schematic flow sheet of the idle and harmonic compensation method embodiment two of the present invention, and the present embodiment is performed by the inverter in Fig. 1, and as shown in Figure 3, the method for the present embodiment is as follows:
S301: receive the distribution instruction that controller sends, distribution instruction comprises reactive power compensation subcomponent and each harmonic compensation subcomponent that inverter distributed to by controller.
S302: the active power compensating subcomponent and inverter according to described reactive power compensation subcomponent and each harmonic exports, and determines the final output variable of described inverter.
The present embodiment, the distribution instruction of controller transmission is received by inverter, distribution instruction comprises reactive power compensation subcomponent and each harmonic compensation subcomponent that inverter distributed to by controller, the active power compensating subcomponent and inverter according to described reactive power compensation subcomponent and each harmonic exports, and determines the final output variable of described inverter.Thus, realizing carrying out idle and harmonic compensation by inverter, without the need to adding compensation equipment with high costs, therefore, reducing the construction cost of photovoltaic power station system.
Fig. 4 is the structural representation of controller embodiment one of the present invention, and as shown in Figure 4, the control of the present embodiment comprises sampling unit 401, control unit 402 and communication unit 403, wherein, adopts unit 401 for obtaining the voltage and current exchanging header box output point; Control unit 402 is for according to described voltage and current, and the reactive power compensation total amount and each harmonic that obtain electric current compensate total component; Control unit 402 is also for being that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, wherein, distribute to the reactive power compensation subcomponent of all inverters and be described reactive power compensation total amount, that the same first harmonic distributing to all inverters compensates subcomponent and compensate total amount for described same first harmonic; Communication unit 403 is for sending distribution instruction to described each inverter, and the distribution instruction of each inverter comprises the reactive power compensation subcomponent and each harmonic compensation subcomponent of distributing to described inverter; Also for reading state and the data of each inverter.
In the above-described embodiments, described control unit 402 is specifically for being that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the rated power of each inverter;
Or, be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the dump power of each inverter.
In the above-described embodiments, described control unit 402 is specifically for according to formula
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
In the above-described embodiments, described control unit 402 is specifically for basis
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter,
be the present output power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
Controller shown in Fig. 4 also comprises power supply unit, and this power supply unit can be built in controller, and can be also external power supply unit, be separated setting with controller, to this, the present invention be restricted.
Each unit of Fig. 4 shown device embodiment can be used for the technical scheme performing embodiment of the method shown in Fig. 2, and it realizes principle and technique effect is similar, repeats no more herein.
Fig. 5 is the structural representation of inverter embodiment one of the present invention, as shown in Figure 5, the inverter of the present embodiment comprises receiving element 501 and processing unit 502, wherein, the distribution instruction that receiving element 501 sends for receiving controller, described distribution instruction comprises reactive power compensation subcomponent and each harmonic compensation subcomponent that inverter distributed to by controller; Processing unit 502 exports for the active power compensating subcomponent and inverter according to described reactive power compensation subcomponent and each harmonic, determines the final output variable of described inverter.
Each unit of Fig. 5 shown device embodiment can be used for the technical scheme performing embodiment of the method shown in Fig. 3, and it realizes principle and technique effect is similar, repeats no more herein.
Methods, devices and systems described by the various embodiments described above of the present invention, also can be applicable to the photovoltaic power station system of centralized inverter composition.In the photovoltaic power station system of centralized inverter composition, comprise two inverters, such as, the inverter of two 500kW, can form the photovoltaic power station system of a 1MW.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the idle and Harmonic-wave compensation system embodiment one of the present invention;
Fig. 2 is the schematic flow sheet of the idle and harmonic compensation method embodiment one of the present invention;
Fig. 3 is the schematic flow sheet of the idle and harmonic compensation method embodiment two of the present invention;
Fig. 4 is the structural representation of controller embodiment one of the present invention;
Fig. 5 is the structural representation of inverter embodiment one of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Claims (11)
1. an idle and harmonic compensation method, is characterized in that, comprising:
Obtain the voltage and current exchanging header box output point;
According to described voltage and current, the reactive power compensation total amount and each harmonic that obtain electric current compensate total component;
Be that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, wherein, distribute to the reactive power compensation subcomponent of all inverters and be described reactive power compensation total amount, that the same first harmonic distributing to all inverters compensates subcomponent and compensate total amount for described same first harmonic;
Send distribution instruction to described each inverter, the distribution instruction of each inverter comprises the reactive power compensation subcomponent and each harmonic compensation subcomponent of distributing to described inverter.
2. method according to claim 1, is characterized in that, described is that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, comprising:
Be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the rated power of each inverter;
Or,
Be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the dump power of each inverter.
3. method according to claim 2, is characterized in that, the described rated power according to each inverter is that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent, comprising:
According to formula
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
4. method according to claim 2, is characterized in that, the described dump power according to each inverter is that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent, comprising:
According to
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter,
be the present output power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
5. an idle and harmonic compensation method, is characterized in that, comprising:
Receive the distribution instruction that controller sends, described distribution instruction comprises reactive power compensation subcomponent and each harmonic compensation subcomponent that inverter distributed to by controller;
The active power compensating subcomponent and inverter according to described reactive power compensation subcomponent and each harmonic exports, and determines the final output variable of described inverter.
6. a controller, is characterized in that, comprising:
Sampling unit, for obtaining the voltage and current exchanging header box output point;
Control unit, for according to described voltage and current, the reactive power compensation total amount and each harmonic that obtain electric current compensate total component;
Described control unit is also for being that reactive power compensation subcomponent corresponding to each inverter distribution and each harmonic compensate subcomponent according to preset rules, wherein, distribute to the reactive power compensation subcomponent of all inverters and be described reactive power compensation total amount, that the same first harmonic distributing to all inverters compensates subcomponent and compensate total amount for described same first harmonic;
Communication unit, for sending distribution instruction to described each inverter, the distribution instruction of each inverter comprises the reactive power compensation subcomponent and each harmonic compensation subcomponent of distributing to described inverter.
7. controller according to claim 6, is characterized in that, described control unit specifically for
Be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the rated power of each inverter;
Or,
Be that reactive power compensation subcomponent corresponding to described each inverter distribution and each harmonic compensate subcomponent according to the dump power of each inverter.
8. controller according to claim 7, is characterized in that, described control unit specifically for
According to formula
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
9. controller according to claim 7, is characterized in that, described control unit specifically for
According to
be retrieved as the amplitude of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent, wherein, M is the sum of inverter,
be the rated power of m platform inverter,
be the present output power of m platform inverter, 1≤m≤M and be integer, as described i=1, described in
for the amplitude of the electric current of A phase reactive power compensation total amount got, described in
for distributing to the amplitude of the electric current of the reactive power compensation subcomponent of m platform inverter, when described i>=2 and be integer time, described in
for A phase i-th subharmonic got compensates the amplitude of the electric current of total component, described in
for the i-th subharmonic distributing to m platform inverter compensates the amplitude of the electric current of subcomponent;
According to
be retrieved as the phase place of the reactive power compensation subcomponent of each inverter distribution and the electric current of each harmonic compensation subcomponent,
be the phase place of the reactive power compensation subcomponent of m platform inverter distribution and the electric current of each harmonic compensation subcomponent, as described i=1, described in
represent the phase place of reactive power compensation A phase reactive power compensation total amount electric current got, when described i>=2 and be integer time, described in
represent that A phase i-th subharmonic got compensates the phase place of the electric current of total component, the phase place of the electric current of the A identical first harmonic compensation subcomponent of all inverters is identical.
10. an inverter, is characterized in that, comprising:
Receiving element, for receiving the distribution instruction that controller sends, described distribution instruction comprises reactive power compensation subcomponent and each harmonic compensation subcomponent that inverter distributed to by controller;
Processing unit, exports for the active power compensating subcomponent and inverter according to described reactive power compensation subcomponent and each harmonic, determines the final output variable of described inverter.
11. 1 kinds of idle and Harmonic-wave compensation system, it is characterized in that, comprise: exchange header box, transformer, M platform inverter as claimed in claim 10, described M is more than or equal to 1 and is integer, controller as described in any one of claim 6 ~ 9, the input of described inverter is connected with cell panel, the output of described inverter is connected with described interchange header box, the output of described interchange header box is connected with the input of described transformer, the input of described controller is connected with the output of described interchange header box, the output of described controller is connected with described M platform inverter respectively by communication bus.
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