CN108683346A - Converter and solar power generation system - Google Patents
Converter and solar power generation system Download PDFInfo
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- CN108683346A CN108683346A CN201810829114.5A CN201810829114A CN108683346A CN 108683346 A CN108683346 A CN 108683346A CN 201810829114 A CN201810829114 A CN 201810829114A CN 108683346 A CN108683346 A CN 108683346A
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- 238000010248 power generation Methods 0.000 title claims abstract description 31
- 238000002955 isolation Methods 0.000 claims abstract description 77
- 230000005611 electricity Effects 0.000 claims description 40
- 238000003860 storage Methods 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 20
- 239000010409 thin film Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000001131 transforming effect Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
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- 239000013078 crystal Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002900 effect on cell Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4807—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode having a high frequency intermediate AC stage
-
- H02J3/383—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- 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
Abstract
The disclosure provides a converter and a solar power generation system, and relates to the technical field of electric power. In the embodiment of the disclosure, by setting the high-frequency isolation circuit, the isolation between the solar power generation device and the inverter circuit can be realized, so as to effectively suppress the PID effect occurring in the solar power generation device, and meanwhile, the leakage current of the solar power generation system can be effectively reduced, and the performance of the solar power generation system can be improved.
Description
Technical field
This disclosure relates to technical field of electric power, espespecially a kind of current transformer and solar power system.
Background technology
In recent years, solar energy has obtained approval both domestic and external and has greatly developed as regenerative resource.The interval of solar energy
Property and uncertainty, are the significant problems that solar grid-connected electricity generation system faces.Wherein, solar power generation can be by cloud cover
Influence, generated output fluctuation it is larger, this fluctuation can cause large effect to the power quality of electric system, such as cause
The fluctuation of network voltage and frequency.In addition, being influenced round the clock, night is peak times of power consumption, but solar cell has stopped at this time
Only work, and the peak period that daytime is solar power generation, but power load is generally fewer, therefore, because solar power generation
Peak valley is staggered with electricity consumption peak valley so that electric power system dispatching is difficult.
Currently, light storage electricity generation system can be effectively improved the deficiency that solar power system is brought.But currently on the market
Light storage electricity generation system applies in general to the solar power system of crystal silicon making, using the isolation common mode leakage of power frequency isolation transformer cabinet
Electric current, but the system for being not particularly suited for thin film solar power generation, and power frequency isolation transformer cabinet is bulky, may be used also in the application
It can cause frequently to trigger itself over-current protection device action of power frequency isolation transformer cabinet because of equipment start-stop electric current moment impact, increase
Add the number and unnecessary maintenance work that fault misdescription is warned, and there are excessive leakage current and electricity for thin film solar electricity generation system
Gesture induces the problems such as decaying (Potential Induced Degradation, PID).
Based on this, influence of the solar power generation to thin film solar electricity generation system how is eliminated, and inhibit thin film solar
Excessive leakage current in electricity generation system and the problems such as anti-PID, is those skilled in the art's technical problem urgently to be resolved hurrily.
Invention content
The embodiment of the present disclosure provides a kind of current transformer and solar power system, to eliminate solar power generation to film
The influence of solar power system, and inhibit excessive leakage current in thin film solar electricity generation system and the problems such as anti-PID.
The embodiment of the present disclosure provides a kind of current transformer, including：High-frequency isolation circuit and inverter circuit；
The high-frequency isolation circuit, for being exported after the DC voltage from device of solar generating is isolated；
The inverter circuit, the DC voltage for inputting the high-frequency isolation circuit export after being changed into alternating voltage
Into power grid and/or load.
By the way that high-frequency isolation circuit is arranged, being isolated for device of solar generating and inverter circuit may be implemented, effectively to press down
It makes the potential occurred in device of solar generating and induces decaying (Potential Induced Degradation, PID) effect
It answers, at the same time it can also effectively reduce the leakage current of solar power system, improves the performance of solar power system.
Optionally, the current transformer further includes being connected between the device of solar generating and the high-frequency isolation circuit
Booster circuit, the DC voltage for providing the device of solar generating carries out after boosting processing output to the high frequency
Isolation circuit.
Boosting processing is carried out to the DC voltage that device of solar generating exports it is thus possible to realize.
Optionally, the booster circuit and the high-frequency isolation circuit form one group of boosting isolation circuit；
The current transformer includes multigroup boosting isolation circuit, the booster circuit difference for isolation circuit of boosting described in every group
It is correspondingly connected with from different device of solar generating.
To when needing to change the output power of solar power system, without to high-frequency isolation circuit and boosting electricity
The structural modification on road directly increases several groups boosting isolation circuit on the basis of original, improves the flexibility of operation.
Optionally, the high-frequency isolation circuit is voltage multiplying rectifier LLC resonant transform circuits.
Optionally, the voltage multiplying rectifier LLC resonant transform circuits include bleeder circuit, switching circuit, resonance circuit, transformation
Device and rectification circuit；
The bleeder circuit is connect with the booster circuit and the switching circuit respectively；The resonance circuit respectively with institute
State the primary side connection of switching circuit and the transformer；The rectification circuit respectively with the secondary side of the transformer and the inversion
Circuit connects.
To pass through simple circuit structure, you can realize the effect of isolation.
Optionally, the current transformer further includes：Charge-discharge circuit and/or power distribution circuit；
One end of the power distribution circuit is connect with the inverter circuit, and the other end connects with the power grid and/or the load
It connects；
One end of the charge-discharge circuit is connect with the high-frequency isolation circuit and the inverter circuit respectively, the other end with
Accumulator connects；
The device of solar generating is also charged by the charge-discharge circuit to accumulator, and the accumulator also passes through institute
State electric energy of the charge-discharge circuit to inverter circuit output storage.
To, after increasing accumulator in solar power system, peak period (when such as sunlight abundance) can be being generated electricity,
By in extra power storage to accumulator, and in peak times of power consumption, power generation low tide one (such as sunlight is insufficient), pass through electric power storage
The electric discharge in pond compensates electric energy, good to make the operation of solar power system obtain to have the function that peak load shifting
Reliability and economy.
Optionally, the charge-discharge circuit is two-way BUCK/BOOST circuits.
To pass through simple circuit structure, you can complete the charge and discharge process of accumulator.
Optionally, the charge-discharge circuit is set as at least two groups, charge-discharge circuit described in every group respectively from different storages
Battery is correspondingly connected with.
To, it is set as multiple in charge-discharge circuit, and when accumulator is set as multiple, it can be low in power generation Peak power use
The time of tide stores more electric energy, the problem of electricity shortage occurs to avoid when generating electricity low tide peak of power consumption, ensures the steady of power supply
It is fixed.
Optionally, the load is threephase load；The inverter circuit is three-level three-phase full bridge inverter.
To so that electricity generation system can be adapted for powerful application range.
Optionally, an output end one connecting node of correspondence of the three-level three-phase full bridge inverter, described three
Phase load is connect with the connecting node, and the power distribution circuit includes three first switches and three second switches；
Each first switch is located at three output ends of the three-level three-phase full bridge inverter, and is located at institute
It states between the output end of three-level three-phase full bridge inverter and the connecting node；
Each second switch is located at three output ends of the three-level three-phase full bridge inverter, and is located at institute
It states between connecting node and the power grid.
To pass through simple switch combination, you can control whether to power for power grid and threephase load.
Second aspect, the embodiment of the present disclosure additionally provide a kind of solar power system, including device of solar generating and
Accumulator further includes：The above-mentioned current transformer provided such as the embodiment of the present disclosure；
The current transformer, at least partly power storage for providing the device of solar generating to the accumulator
In；Or after the DC voltage that the device of solar generating and/or the accumulator provide is changed into alternating voltage, respectively
It is the power grid and/or the load supplying in output to power grid and/or load.
The above-mentioned current transformer provided by increasing the embodiment of the present disclosure in electricity generation system, can make traditional solar energy
Electricity generation system is improved to the complementary micro-grid power generation system of light storage, which can not only connect with power grid, and can be with
In electric network power-fail, independent operating；And power grade can be improved from multikilowatt to MW class so that the micro-grid power generation system
Application range with wider bigger.
The disclosure has the beneficial effect that：
A kind of current transformer and solar power system that the embodiment of the present disclosure provides can by the way that high-frequency isolation circuit is arranged
To realize being isolated for device of solar generating and inverter circuit, effectively to inhibit the electricity occurred when device of solar generating is grounded
Gesture induces decaying (Potential Induced Degradation, PID) effect, at the same time it can also effectively reduce solar energy hair
The leakage current of electric system improves the performance of solar power system.
Description of the drawings
Fig. 1 is one of the structural schematic diagram of current transformer provided in the embodiment of the present disclosure；
Fig. 2 is the second structural representation of the current transformer provided in the embodiment of the present disclosure；
Fig. 3 is the third structural representation of the current transformer provided in the embodiment of the present disclosure；
Fig. 4 is the four of the structural schematic diagram of the current transformer provided in the embodiment of the present disclosure；
Fig. 5 is current transformer concrete structure schematic diagram shown in Fig. 3；
Fig. 6 is the flow chart of the distribution method provided in the embodiment of the present disclosure；
Fig. 7 and Fig. 8 is respectively the structural schematic diagram of the solar power system provided in the embodiment of the present disclosure.
Specific implementation mode
Below in conjunction with attached drawing, the specific reality of a kind of current transformer and solar power systems that provide the embodiment of the present disclosure
The mode of applying is described in detail.It should be noted that described embodiment is only disclosure a part of the embodiment, without
It is whole embodiment.Based on the embodiment in the disclosure, those of ordinary skill in the art are not before making creative work
The every other embodiment obtained is put, the range of disclosure protection is belonged to.
It should be pointed out that the embodiment of the present disclosure was directed to can be thin film solar electricity generation system, but it is not limited to this,
By the setting to current transformer, it can effectively inhibit the leakage current occurred in thin film solar electricity generation system excessive and PID etc.
Problem, to effectively improve the performance of thin film solar electricity generation system.
The embodiment of the present disclosure provides a kind of current transformer, and as shown in Figures 1 to 4, current transformer 10 may include：High-frequency isolation
Circuit 11, inverter circuit 12；
High-frequency isolation circuit 11, for being exported after the DC voltage from device of solar generating 40 is isolated；
Inverter circuit 12, the DC voltage for inputting high-frequency isolation circuit 11 export after being changed into alternating voltage to electricity
In net 20 and/or load 30.
In actual application, the PID effects that solar power system occurs may be due to device of solar generating 40
In long-term high voltage operation, there are leakage currents between cover-plate glass, encapsulating material, frame, and a large amount of accumulations are in electricity
The surface of pond piece so that the passivation effect on cell piece surface is deteriorated, and leads to the reduced performance of device of solar generating 40.Therefore,
Ground connection setting can be carried out to device of solar generating 40, wherein can be the cathode ground connection of device of solar generating 40, it can be with
The charge export that will accumulate in cell piece surface, to effectively inhibit the generation of PID effects.
However, being possible to will appear the phenomenon of short circuit after the cathode ground connection of device of solar generating 40, in order to have
Effect inhibits PID effects, and can prevent short circuit, and the embodiment of the present disclosure is set between device of solar generating 40 and inverter circuit 12
High-frequency isolation circuit 11 is set, is kept apart device of solar generating 40 and inverter circuit 12 by high-frequency isolation circuit 11.Also,
Since the parasitic capacitance between device of solar generating 40 and the earth is larger, if being arranged without isolation, solar power generation system
System will produce larger leakage current and solar power system caused to can not work normally.Therefore, to device of solar generating 40
Carrying out isolation processing with inverter circuit 12 just becomes particularly important.
In the embodiments of the present disclosure, by be arranged high-frequency isolation circuit 11, may be implemented device of solar generating 40 with it is inverse
Become the isolation between circuit 12, effectively to inhibit the PID effects occurred in device of solar generating 40, at the same time it can also have
Effect reduces the leakage current of solar power system, improves the performance of solar power system.
In the specific implementation, since the DC voltage of the output of device of solar generating 40 is relatively low, so needing to direct current
Pressure carries out boosting processing, and therefore, in order to realize the purpose of boosting, in the embodiments of the present disclosure, current transformer 10 can also include：Even
The booster circuit 14 being connected between the device of solar generating 40 and the high-frequency isolation circuit 11；Booster circuit 14, is used for
Output is to high frequency isolation circuit 11 after the DC voltage that device of solar generating 40 is provided carries out boosting processing, such as Fig. 3 and Fig. 4
It is shown；Also, booster circuit 14 can be BOOST booster circuits, as shown in Figure 5.
Shown in Figure 5, BOOST booster circuits may include：One switch (such as K3), a capacitance (such as Cpv), one
Inductance (such as L1) and a transistor (such as IGBT1), the transistor can be insulated gate bipolar transistor.Wherein, inductance
(such as L1's) act as mutually converting electric energy and magnetic field energy, and when K3 is closed and IGBT1 is connected, L1 can be converted electric energy to
Magnetic field energy stores, when K3 be closed and IGBT1 disconnect when, the magnetic field energy of storage is converted into electric energy by L1, this electric energy with
Stable DC voltage is obtained after being filtered by Cpv after the voltage superposition that device of solar generating 40 provides, since this is straight
Galvanic electricity pressure is that the voltage that device of solar generating 40 provides is converted to being superimposed for electric energy with the magnetic field energy of L1, so from BOOST liters
The voltage of volt circuit output is greater than the voltage of the input of device of solar generating 40, therefore completes the process of boosting.
Therefore, by BOOST booster circuits, the lower DC voltage that device of solar generating 40 exports can be increased
To stable DC bus-bar voltage, in order to provide suitable voltage for power grid 20 and/or load 30.
In addition, BOOST booster circuits also have the function of maximum power point tracking, in this way, can make solar power generation
The output power of device 40 maintains near maximum power, improves the utilization rate of device of solar generating, to improve solar energy
The generating efficiency of electricity generation system.
Certainly, in order to realize the purpose of boosting, in the embodiments of the present disclosure, booster circuit 14 can also be that other can be real
The circuit for purpose of now boosting, does not limit herein.
Specifically, in order to realize the isolation processing between booster circuit 14 and inverter circuit 12, in the embodiment of the present disclosure
In, as shown in figure 5, high-frequency isolation circuit 11 can be voltage multiplying rectifier LLC resonant transform circuits.
Wherein, shown in Figure 5, voltage multiplying rectifier LLC resonant transform circuits may include：Bleeder circuit 11-C, switch electricity
Road 11-K, resonance circuit 11-X, transformer 11-B and rectification circuit 11-Z；The bleeder circuit 11-C respectively with booster circuit and
Switching circuit 11-K connections；Resonance circuit 11-X connects with the primary side of the switching circuit 11-K and the transformer 11-B respectively
It connects；The rectification circuit 11-Z is connect with the secondary side of the transformer 11-B and the inverter circuit 12 respectively.
Bleeder circuit 11-C is (to use C1 by two capacitances being connected in series between the two of booster circuit 14 output ends
Indicate) composition, for realizing the effect of partial pressure.Switching circuit 11-K is made of multiple diodes and multiple triodes, resonance electricity
Road 11-X is made of two inductance (Lr), two capacitances (Cr) and two magnetizing inductances (L60), passes through switching circuit 11-K
Duty ratio is adjusted, the output voltage of resonance circuit 11-X can be controlled, and switching circuit may be implemented by resonance circuit 11-X
The Sofe Switch of 11-K works.Transformer 11-B has buffer action, passes through the isolation of transformer 11-B so that transformer 11-B's
There is no electrical connection between primary and secondary side, i.e., primary and secondary side is mutually insulated, and electric energy is transmitted by magnetic field, to rise
To the effect of isolation, and the no-load voltage ratio of ideal transformer is 1:1, in order to keep transformer 11-B primary and secondary side busbar
Voltage is consistent, and rectification circuit 11-Z is connected to the secondary side of transformer.Wherein, rectification circuit 11-Z is voltage multiplying rectifier electricity
Road is made of eight diodes, while realizing rectifying and wave-filtering effect, it is also possible that the voltage on secondary side reaches high-amplitude
Symmetrical DC bus-bar voltage.
By the collective effect of above-mentioned several circuits, being isolated for booster circuit 14 and inverter circuit 12 not only may be implemented,
The leakage current for effectively reducing solar power system, prevents the effects such as PID, can be applicable to powerful applied field
Scape widens the application range of solar power system.
It should be pointed out that do not include booster circuit 14 in current transformer 10, when only including high-frequency isolation circuit 11, high frequency
The no-load voltage ratio of transformer in isolation circuit 11 cannot be 1:1, it needs to be adjusted according to actual needs, to meet practical need
It wants.Certainly, the structure of high-frequency isolation circuit 11 is not limited to shown in Fig. 4, can also be that high-frequency isolation effect may be implemented in other
Structure, do not limit herein.
Optionally, in the embodiments of the present disclosure, as shown in Figure 3 to Figure 4, booster circuit 14 and high-frequency isolation circuit 11 can be with
Form one group of boosting isolation circuit 60；Also, current transformer 10 may include the boosting isolation circuit 60, as shown in Figure 2；At this point,
The device of solar generating 40 being connect with the boosting isolation circuit 60 can be one group.
However, in solar power system, there may be a large amount of device of solar generating 40, and in different feelings
Need the output power of solar power system also different under condition, so for the ease of adjusting output power, and convenient for big
The device of solar generating 40 of amount is configured, and current transformer 10 can also include multigroup boosting isolation circuit 60, and every group of boosting
Isolation circuit 60 is correspondingly connected with from different device of solar generating 40, as shown in Figure 3, that is to say, that if one group of boosting isolation
When circuit 60 is correspondingly connected with one group of device of solar generating 40, different boosting isolation circuits 60 is correspondingly connected with different groups of the sun
It can power generator 40.To when needing to change the output power of solar power system, without to booster circuit 14 and high frequency
The structure of isolation circuit 11 is modified, and is directly increased several groups circuit on the basis of original, is improved the spirit of operation
Activity.
It should be noted that in the embodiments of the present disclosure, device of solar generating 40 can be solar power generation watt or too
It is positive can the solar components such as power generating glass, or the sun such as the photovoltaic curtain wall being made of multiple solar components or power generation roof
Energy power generator, does not limit herein.Also, device of solar generating 40 can be crystal silicon solar power generator, can be with
It is thin film solar power generator, does not also limit herein.
In the specific implementation, since device of solar generating 40 is influenced by cloud cover so that generated output fluctuates
It is larger；Also, in peak times of power consumption (as at night), device of solar generating 40 has stopped generating electricity, and is filled in solar power generation
40 power generation peak period (such as daytime) is set, then is electricity consumption low tide one, in this way, the peak valley of solar power generation is staggered with electricity consumption peak valley,
Cause electric power system dispatching difficult.
To solve the above-mentioned problems, accumulator 50 can be increased in solar power system, for stabilize solar energy and
The fluctuation of load；Therefore, in the embodiments of the present disclosure, as shown in Figures 2 to 4, current transformer 10 can also include：Charge-discharge circuit
15 and/or power distribution circuit 13；One end of power distribution circuit 13 is connect with the inverter circuit 12, the other end and the power grid and/or
The load connection；One end of charge-discharge circuit 15 is connect with high-frequency isolation circuit 11 and inverter circuit 12 respectively, the other end with
Accumulator 50 connects；Wherein, device of solar generating 40 is also charged by charge-discharge circuit 15 to accumulator 50, and accumulator 50 is also
The electric energy that can be stored to the output of inverter circuit 12 by charge-discharge circuit 15.In other words, charge-discharge circuit 15, for storing
Under the charge mode of battery 50, the DC voltage that device of solar generating 40 exports is transmitted to accumulator 50；In accumulator 50
Under discharge mode, the DC voltage that accumulator 50 exports is transmitted to inverter circuit 12；It, can so at this point, high-frequency isolation circuit 11
To be additionally operable to carry out isolation processing to charge-discharge circuit 15 and device of solar generating 40, i.e., to charge-discharge circuit 15 and boosting electricity
Road 14 carries out isolation processing, to prevent electric energy from pouring in down a chimney.
That is, by charge-discharge circuit 15, when needing in power storage to accumulator 50, as accumulator 50
Charging stage, at this time charge-discharge circuit 15 DC voltage that high-frequency isolation circuit 11 exports is transmitted in accumulator 50, with
Accumulator 50 is set to store electric energy.And when to need accumulator 50 be that solar energy supplements electricity consumption, the as discharge regime of accumulator 50,
The electric energy that accumulator 50 stores is transmitted to inverter circuit 12 by charge-discharge circuit 15 at this time, is provided for power grid 20 and/or load 30
Electric energy.
It therefore, can be in power generation peak period (such as sunlight abundance after increasing accumulator 50 in solar power system
When), by extra power storage to accumulator 50, and in peak times of power consumption, power generation low tide one (such as sunlight is insufficient), lead to
The electric discharge of accumulator 50 is crossed to compensate electric energy, to have the function that peak load shifting, to make the operation of solar power system take
Obtain good reliability and economy.
Specifically, in the embodiments of the present disclosure, a group storage battery 50 can be set, and charge-discharge circuit 15 can be arranged at this time
For one (or being one group), as shown in Figure 4 and Figure 5；Certainly, accumulator 50 may be arranged as multigroup, in order to more added with
The fluctuation of solar energy and load is stabilized on effect ground, and therefore, charge-discharge circuit 15 correspondingly could be provided as multiple (or being multigroup),
And each charge-discharge circuit 15 is correspondingly connected with from different accumulators 50, it is specific as shown in Figure 4.To in charge-discharge circuit 15
It is set as multiple, and when accumulator 50 is set as multiple, more electric energy can be stored in the power generation Peak power use time of low water, with
It avoids the problem that electricity shortage occur when generating electricity low tide peak of power consumption, ensures the stabilization of power supply.
Specifically, in the embodiments of the present disclosure, charge-discharge circuit 15 could be provided as two-way BUCK/BOOST circuits.
Shown in Figure 5, two-way BUCK/BOOST circuits may include：One switch (such as K4), a capacitance are (such as
Cbat), an inductance (such as L2) and two transistors (such as IGBT2 and IGBT3), the two transistors can be insulated gate
Bipolar transistor.Under charge mode, two-way BUCK/BOOST circuits form BUCK reduction voltage circuits, and IGBT2 is disconnected at this time,
IGBT3 is connected, and K3 is closed, and realizes the charging to accumulator 50.Under discharge mode, two-way BUCK/BOOST circuits are formed
BOOST circuits, at this time IGBT2 conductings, IGBT3 conductings, K3 are closed, and realize that the electric discharge of accumulator 50, compensation solar energy are power grid
20 and/or load 30 power supply.
Certainly, the structure of charge-discharge circuit 15 is not limited to shown in Fig. 5, can also be that accumulator charging may be implemented in other
With the circuit of discharging function, do not limit herein.
In the specific implementation, load 30 be threephase load, and high-frequency isolation circuit 11 export be DC voltage when,
In the embodiment of the present disclosure, as shown in figure 5, inverter circuit 12 can be three-level three-phase full bridge inverter, for what will be inputted
DC voltage is changed into after three-phase alternating voltage output to power distribution circuit 13 so that electricity generation system can be adapted for it is high-power
Application scenarios.
Specifically, in the embodiments of the present disclosure, as shown in figure 5, can also include being connected to three level three in current transformer 10
Filter circuit 16 between phase full bridge inverter 12 and power distribution circuit 13, for being filtered to three-phase alternating voltage,
So that the three-phase alternating voltage that inverter circuit 12 exports more is stablized, so that power grid 20 and/or threephase load 30 obtain more
Add stable voltage, to ensure the normal work of equipment.
Optionally, in the embodiments of the present disclosure, as shown in figure 5, filter circuit 16 can be LCL filter circuits.Wherein,
LCL filter circuits may include：Three capacitances (such as C3) and six inductance (such as L3), it is inverse to be connected to three-level three-phase full-bridge
Three output ends for becoming circuit 12, in order to which the voltage exported to three-level three-phase full bridge inverter 12 is filtered.
Certainly, the structure of filter circuit 16 is not limited to shown in Fig. 5, can also be that the electricity of filter function may be implemented in other
Road does not limit herein.
In the specific implementation, there are two types of the operating modes of current transformer 10, respectively grid-connect mode and off-network pattern；Grid-connected mould
Under formula, power grid 20 is connect with current transformer 10 so that current transformer 10 export voltage be transmitted in power grid 20, by high pressure conduct with
It is used for remote equipment.Under off-network pattern, power grid 20 is disconnected with current transformer 10, only loads 30 outputs for being connected to current transformer 10
End, inverter circuit 12 operates under voltage source mode at this time, and alternating voltage and energy needed for work are provided for load 30.
It should be noted that the above-mentioned voltage source mode referred to is the internal control mode of current transformer 10, in off-network pattern
Under, current transformer 10 needs to provide alternating voltage, which can be realized by internal control, at this time can control the inside
Mode processed is referred to as voltage source mode.
Specifically, in order to control the connection of power grid 20 and load 30 and current transformer 10 by power distribution circuit 13,
In the embodiment of the present disclosure, as shown in figure 5, power distribution circuit 13 may include：Three first switches (such as K1) and three second switches
(such as K2)；Wherein, each first switch (such as K1) is located at three output ends of three-level three-phase full bridge inverter 12, and position
Between the output end and connecting node Q of three-level three-phase full bridge inverter 12, i.e., each first switch (such as K1) is located at
Each output end of LCL filter circuits, and between each output end and connecting node Q of LCL filter circuits；Each second switch
(such as K2) is located at three output ends of three-level three-phase full bridge inverter 12, i.e., each second switch (such as K2) is located at
Each output end of LCL filter circuits, and between connecting node Q and power grid 20；Also, three-level three-phase full bridge inverter
12 output end corresponds to a connecting node Q, and threephase load 30 is connect with connecting node Q.
That is, when three first switches (such as K1) and three second switches (such as K2) are closed, power grid 20 and three
Phase load 30 is electrically connected with current transformer 10, i.e. grid-connect mode, and current transformer 10 can be that power grid 20 and threephase load 30 are powered.
Three first switches (such as K1) are closed, and when three second switches (such as K2) disconnections, only threephase load 30 is connected to current transformer
In 10, and power grid 20 is then not connected with current transformer 10, and as off-network pattern, current transformer 10 is powered for threephase load 30 at this time, and
Will not be that power grid 20 is powered.
Optionally, in the embodiments of the present disclosure, first switch (such as K1) and second switch (such as K2) can be relay.
Certainly, the concrete structure of first switch and the second switch is not limited to this, and can also be that the knot of switching function may be implemented in other
Structure.
The embodiment of the present disclosure additionally provides a kind of distribution method, the above-mentioned current transformer 10 provided using such as embodiment of the present disclosure
It is realized, as shown in fig. 6, method may include：
S501, device of solar generating are to high-frequency isolation circuit output DC voltage；
S502, high-frequency isolation circuit carry out isolation processing to device of solar generating and inverter circuit, and by treated
Direct voltage output is to inverter circuit；
Wherein, high-frequency isolation circuit carries out isolation processing to device of solar generating and inverter circuit, it can be understood as right
The DC voltage of device of solar generating output carries out isolation processing, while transmission to be conducive to electric energy, ensures power generation system
System normal power supply.
S503, inverter circuit export after the DC voltage of input is changed into alternating voltage to power distribution circuit；
S504, power distribution circuit will be in AC voltages transmission to power grid and/or loads.
Optionally, in the embodiments of the present disclosure, when current transformer 10 includes charge-discharge circuit 15, further include：
High-frequency isolation circuit carries out isolation processing to device of solar generating and charge-discharge circuit, and will treated direct current
Voltage is exported respectively to inverter circuit and charge-discharge circuit.
Specifically, in the embodiments of the present disclosure, when it is threephase load to load 30, inverter circuit is by the DC voltage of input
Output can be specifically included to power distribution circuit after being changed into alternating voltage：
The DC voltage that high-frequency isolation circuit and/or charge-discharge circuit export is changed into three-phase alternating voltage by inverter circuit
Afterwards, three-phase alternating voltage is exported to power distribution circuit.
With reference to specific embodiment, the above-mentioned distribution method provided the embodiment of the present disclosure illustrates.
Embodiment one：In conjunction with structure shown in fig. 5, in sunlight abundance, under grid-connect mode and in electricity consumption low tide one,
Distribution method in the embodiment of the present disclosure is illustrated.
Step 1: device of solar generating exports the first DC voltage to BOOST booster circuits；
Step 2: the first DC voltage of BOOST booster circuits pair carries out boosting processing, transmitted after forming the second DC voltage
To voltage multiplying rectifier LLC resonance transforming circuits；
Step 3: voltage multiplying rectifier LLC resonance the second DC voltage of transforming circuit pair carries out shape after voltage multiplying rectifier resonance processing
At third DC voltage, and it is transmitted in three-level three-phase full bridge inverter and charge-discharge circuit；
Step 4: charge-discharge circuit will be in power storage to accumulator；
Step 5: third DC voltage is changed into three-phase alternating voltage by three-level three-phase full bridge inverter, it is transmitted to
LCL filter circuits；
Step 6: after LCL filter circuits are filtered alternating voltage, power grid is transmitted to by power distribution circuit and is born
In load.
Embodiment two：In conjunction with structure shown in fig. 5, in sunlight deficiency, when under off-network pattern, to the embodiment of the present disclosure
In distribution method illustrate.
Step 1: device of solar generating exports the first DC voltage to BOOST booster circuits；
Step 2: the first DC voltage of BOOST booster circuits pair carries out boosting processing, transmitted after forming the second DC voltage
To voltage multiplying rectifier LLC resonance transforming circuits；
Step 3: voltage multiplying rectifier LLC resonance the second DC voltage of transforming circuit pair carries out shape after voltage multiplying rectifier resonance processing
At third DC voltage, and it is transmitted to three-level three-phase full bridge inverter；
Step 4: the third DC voltage provided in accumulator is transmitted to three-level three-phase full-bridge inverting by charge-discharge circuit
Circuit；
Step 5: third DC voltage is changed into three-phase alternating voltage by three-level three-phase full bridge inverter, it is transmitted to
LCL filter circuits；
Step 6: after LCL filter circuits are filtered alternating voltage, it is transmitted in load by power distribution circuit.
The embodiment of the present disclosure additionally provides a kind of solar power system, as shown in Figure 7 and Figure 8, including：Solar power generation
Device 40 and accumulator 50；Further include：The above-mentioned current transformer 10 provided such as the embodiment of the present disclosure；Also, the output of current transformer 10
End is connected with power grid 20 and/or load 30；
Current transformer 10, in at least partly power storage to accumulator 50 for providing device of solar generating 40；Or,
After the DC voltage that device of solar generating 40 and/or accumulator 50 provide is changed into alternating voltage, exported respectively to power grid
20 and/or load 30 in, be power grid 20 and/or load 30 power supply.
The above-mentioned current transformer 10 provided by increasing the embodiment of the present disclosure in electricity generation system, can make traditional sun
Energy electricity generation system is improved to the complementary micro-grid power generation system of light storage, which can not only connect with power grid 20, again
Can be in 20 power down of power grid, independent operating；And the power grade exported can be improved from multikilowatt to MW class so that should
Micro-grid power generation system has wider application range.
In the specific implementation, in the embodiments of the present disclosure, load 30 can set at least to one, such as Fig. 6 and Fig. 7 institutes
Show.That is, shown in Figure 7, load 30 can only be set as one so that current transformer 10 power to power grid 20 it is same
When, it can also be to 30 power supply of load.It is shown in Figure 8, load 30 could be provided as it is multiple, and each load 30 with current transformer 10
It is connected, i.e., current transformer 10 can be respectively to 30 power supply of each load.
Similarly, the setting quantity of device of solar generating 40 equally can be at least one, and when being arranged multiple, too
Positive energy power generator 40 and the connection relation of current transformer 10 may refer to shown in Fig. 4 above-mentioned, and details are not described herein.Similarly, it stores
The setting of battery 50 equally may be at least one, and when being arranged multiple, the connection relation of accumulator 50 and current transformer 10
It may refer to shown in Fig. 4 above-mentioned, details are not described herein.
The embodiment of the present disclosure provides a kind of current transformer and solar power system, can by the way that high-frequency isolation circuit is arranged
To realize being isolated for device of solar generating and inverter circuit, with effectively inhibit to occur when device of solar generating is grounded
PID effects improve the performance of solar power system at the same time it can also effectively reduce the leakage current of solar power system.
Obviously, those skilled in the art can carry out the disclosure essence of the various modification and variations without departing from the disclosure
God and range.In this way, if these modifications and variations of the disclosure belong to the range of disclosure claim and its equivalent technologies
Within, then the disclosure is also intended to include these modifications and variations.
Claims (11)
1. a kind of current transformer, which is characterized in that including：High-frequency isolation circuit and inverter circuit；
The high-frequency isolation circuit, for being exported after the DC voltage from device of solar generating is isolated；
The inverter circuit, the DC voltage for inputting the high-frequency isolation circuit export after being changed into alternating voltage to electricity
Net and/or load.
2. current transformer as described in claim 1, which is characterized in that the current transformer further includes being connected to the solar power generation
Booster circuit between device and the high-frequency isolation circuit, DC voltage for providing the device of solar generating into
It is exported to the high-frequency isolation circuit after row boosting processing.
3. current transformer as claimed in claim 2, which is characterized in that the booster circuit and high-frequency isolation circuit composition one
Group boosting isolation circuit；
The current transformer includes multigroup boosting isolation circuit, described in every group boost isolation circuit booster circuit respectively with not
Same device of solar generating is correspondingly connected with.
4. current transformer as claimed in claim 2, which is characterized in that the high-frequency isolation circuit becomes for voltage multiplying rectifier LLC resonance
Change circuit.
5. current transformer according to claim 4, which is characterized in that the voltage multiplying rectifier LLC resonant transform circuits include point
Volt circuit, switching circuit, resonance circuit, transformer and rectification circuit；
The bleeder circuit is connect with the booster circuit and the switching circuit respectively；The resonance circuit is opened with described respectively
The primary side of powered-down road and the transformer connects；The rectification circuit respectively with the secondary side of the transformer and the inverter circuit
Connection.
6. current transformer as described in any one in claim 1-5, which is characterized in that the current transformer further includes：Charge-discharge circuit
And/or power distribution circuit；
One end of the power distribution circuit is connect with the inverter circuit, and the other end is connected with the power grid and/or the load；
One end of the charge-discharge circuit is connect with the high-frequency isolation circuit and the inverter circuit respectively, the other end and electric power storage
Pond connects；
The device of solar generating is also charged by the charge-discharge circuit to the accumulator, and the accumulator also passes through institute
State electric energy of the charge-discharge circuit to inverter circuit output storage.
7. current transformer as claimed in claim 6, which is characterized in that the charge-discharge circuit is two-way BUCK/BOOST circuits.
8. current transformer as claimed in claim 6, which is characterized in that the charge-discharge circuit is set as at least two groups, every group of institute
Charge-discharge circuit is stated to be correspondingly connected with from different accumulators respectively.
9. current transformer as claimed in claim 6, which is characterized in that the load is threephase load；
The inverter circuit is three-level three-phase full bridge inverter.
10. current transformer as claimed in claim 9, which is characterized in that one of the three-level three-phase full bridge inverter is defeated
Outlet corresponds to a connecting node, and the threephase load is connect with the connecting node；
The power distribution circuit includes three first switches and three second switches；
Each first switch is located at three output ends of the three-level three-phase full bridge inverter, and is located at described three
Between the output end of level three-phase full-bridge inverting circuit and the connecting node；
Each second switch is located at three output ends of the three-level three-phase full bridge inverter, and is located at the company
It connects between node and the power grid.
11. a kind of solar power system, including device of solar generating and accumulator, which is characterized in that further include：Such as right
It is required that 1-10 any one of them current transformers；
The current transformer, in at least partly power storage to the accumulator for providing the device of solar generating；
It is defeated respectively or after the DC voltage that the device of solar generating and/or the accumulator provide is changed into alternating voltage
Go out into power grid and/or load, is the power grid and/or the load supplying.
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