CN207603231U - A kind of gird-connected inverter - Google Patents
A kind of gird-connected inverter Download PDFInfo
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- CN207603231U CN207603231U CN201721349231.9U CN201721349231U CN207603231U CN 207603231 U CN207603231 U CN 207603231U CN 201721349231 U CN201721349231 U CN 201721349231U CN 207603231 U CN207603231 U CN 207603231U
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- gird
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- connected inverter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses a kind of gird-connected inverters, including DC/DC modular converters, power storage module, intelligent power module, transformer, alternating current-direct current detection module and controller, controller connects DC/DC modular converters respectively, alternating current-direct current detection module and intelligent power module, according to the voltage swing after DC voltage and DC current the control DC/DC modular converter boostings acquired twice before and after alternating current-direct current detection module to desired value, and according to alternating current-direct current detection module acquire the gird-connected inverter export voltage and current phase and the AC network voltage and current phase, control intelligent power module causes the output of transformer and the same same phase of pressure of AC network, it is carried out using the gird-connected inverter of the utility model grid-connected, current harmonics amount is small when grid-connected, reliability is high, power grid power quality is high.
Description
Technical field
The utility model is related to the grid-connected aspect of power field more particularly to solar power generation, more specifically to one
Kind gird-connected inverter.
Background technology
Multi-functional gird-connected inverter is as one of critical component in distributed generation system and micro-capacitance sensor technology, in recent years
In-depth study is obtained.Existing photovoltaic combining inverter by photovoltaic confluence output DC current filtering after by
It flows breaker and carries out DC/AC transformation, then be connected to the grid after carrying out ac filter by AC circuit breaker, electric current grid-connected in this way is humorous
Wave amount is big, poor reliability, seriously affects power grid power quality.And in photovoltaic generating system, the utilization rate of photovoltaic cell is removed
Bulk properties with photovoltaic cell by the use environment such as factors such as irradiation level, load and temperature by outside the Pass, also being influenced, not
Under same external condition, photovoltaic cell needs are operated on different and unique maximum power point.Photovoltaic generating system is come
It says, the optimum Working of solar panel should be sought, carry out opto-electronic conversion to greatest extent.
Utility model content
The technical problem to be solved by the present invention is to for the above-mentioned existing current harmonics amount of photovoltaic combining inverter
Greatly, the technological deficiency of poor reliability provides a kind of gird-connected inverter.
The utility model is its technical problem of solution, provides a kind of gird-connected inverter, comprising：
DC/DC modular converters, for the DC power supply of electric energy generation device to be boosted；
Power storage module connects DC/DC modular converters, for the DC power supply after boosting to be stored；
Intelligent power module connects power storage module, for electric energy in power storage module to be converted to and alternating current
The alternating current of net same frequency；
Transformer, for the alternating current with AC network same frequency to be converted to the exchanging with voltage with AC network
It is exported after electricity；
Alternating current-direct current detection module connects the DC power supply of electric energy generation device to obtain the DC voltage of the DC power supply
And DC current, while the output terminal of transformer is connected to obtain the phase of the voltage and current of the gird-connected inverter output
Position, and for connect with AC network with obtain AC network voltage and current phase；
Controller connects DC/DC modular converters, alternating current-direct current detection module and intelligent power module, for basis respectively
Voltage after DC voltage and DC current the control DC/DC modular converter boostings acquired twice before and after alternating current-direct current detection module is big
As low as desired value, and the phase of voltage and current that the gird-connected inverter for being acquired according to alternating current-direct current detection module exports
With the phase of the voltage and current of the AC network, control intelligent power module so that the output of transformer and AC network are same
Press same phase.
The direct current filter for filtering out alternating current in the DC power supply is further included in the gird-connected inverter of the utility model
Wave device.
In the gird-connected inverter of the utility model, capacitance of the DC filter for the DC power supply both ends in parallel.
It is further included in the gird-connected inverter of the utility model：It is described for voluntarily being disconnected when the DC power supply is excessive
The dc circuit breaker of DC power supply and connection are simultaneously controlled by the controller to disconnect the dc circuit breaker of the DC power supply
Contactor, the dc circuit breaker and the contactor are connected between the DC filter and DC/DC modular converters.
In the gird-connected inverter of the utility model, it is also associated with being used between transformer and the intelligent power module
The breaker of overcurrent protection and for filter out included in the output of the intelligent power module with AC network different frequencies
The LC wave filters of rate electric current.
In the gird-connected inverter of the utility model, the output of intelligent power module is three-phase electricity, the transformer and
The breaker connected between the intelligent power module is 3P breakers, and the LC wave filters are three-phase and four-line wave filter, to divide
It Lian Jie not three-phase electricity and ground wire.
In the gird-connected inverter of the utility model, power storage module is bus capacitor.
In the gird-connected inverter of the utility model, the direct current that is acquired twice before and after the above-mentioned detection module according to alternating current-direct current
It presses and is specially with voltage swing to the desired value after DC current control DC/DC modular converter boostings：
The output power P of electric energy generation device is detected under any voltage value U of power storage modulen-1, then it is electric herein
Add a voltage disturbance on the basis of pressure U, then detect the output power P of electric energy generation device under current statenIf detection
To output power PnMore than Pn-1, then increase an electricity with before on the basis of the voltage value of previous power storage module every time
Pressure disturbs disturbance in the same direction to update U, until this output power detected detected no more than it is previous detect it is defeated
When going out power, the difference for then comparing the output power and the secondary output power detected second from the bottom of last time is poor with presetting
Value, if the difference is more than preset difference value, by the voltage at power storage module both ends towards into electricity during detection second from the bottom time
U adjustment is pressed, voltage U adjustment when otherwise being detected towards last time.
In the gird-connected inverter of the utility model, DC/DC modular converters include inductance, diode and controllable switch,
One end of inductance is used to connect an output terminal of the DC power supply of electric energy generation device, the other end connection diode of inductance
Anode, power storage module be connected in parallel on the cathode of diode and the DC power supply of electric energy generation device another output terminal it
Between, controllable switch is connected to another described output terminal of the other end of inductance and the DC power supply of electric energy generation device
Between, the controllable switch is controlled by controller to carry out the control of break-make.
In the gird-connected inverter of the utility model, power storage module is output voltage UOMeet：
In formula, T=ton+toff, ton、toffRespectively controllable switch conducting and the time disconnected, VPVFor electric energy generation device
Two output terminals of DC power supply between voltage；
The V of preset voltage value and acquisition of the controller based on power storage module both endsPV, calculated using above-mentionedValue, and controllable switch is adjusted until reaching what is calculatedValue, the actual voltage value at power storage module both ends after adjusting
Form the desired value.
In the gird-connected inverter of the utility model, one is further included for communicating to connect connecing for the controller and host
Mouthful so that the host is to be shown and/or be sent after the working condition of the gird-connected inverter is obtained from the controller
Control instruction is to the controller to adjust the working condition of the gird-connected inverter.
Implement the gird-connected inverter of the utility model, controller is according to the direct current acquired twice before and after alternating current-direct current detection module
Voltage and DC current control the voltage swing after the boosting of DC/DC modular converters to desired value, and according to alternating current-direct current detection module
The phase of the phase of the voltage and current of the gird-connected inverter output of acquisition and the voltage and current of the AC network, control
Intelligent power module processed cause transformer output and AC network with pressing same phase, using the utility model gird-connected inverter into
Row is grid-connected, and current harmonics amount is small when grid-connected, and reliability is high, and power grid power quality is high.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the circuit diagram of a preferred embodiment of the gird-connected inverter of the utility model；
Fig. 2 be the utility model Fig. 1 in partial circuit physical circuit figure.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
As shown in Figure 1, the circuit diagram of a preferred embodiment of its gird-connected inverter for the utility model.In this reality
In the gird-connected inverter for applying example, including DC filter 1, contactor 2, dc circuit breaker 3, DC/DC modular converters 4, electric energy
Memory module 5, intelligent power module 6 (IPM, Intelligent Power Module), controller 7, alternating current-direct current detection module
8th, LC wave filters 9,3P breakers 10 and transformer 11.Two input terminals connection photovoltaic array of DC filter 1, controller
7 connection hosts, the output terminal of transformer 11 connect AC load and AC network respectively.As shown in the figure, DC power supply is passing through
It crosses intelligent power module 6 and becomes three-phase alternating current from two terminals with positive and negative DC voltage, and be three-phase always behind
Electricity is transmitted.
With reference to Fig. 2, be the utility model Fig. 1 in partial circuit physical circuit figure, the contact in wherein Fig. 1
Device 2, dc circuit breaker 3 are not shown in fig. 2.Photovoltaic array converts light energy into electric energy, electric energy by DC form reach with
Its DC filter 1 connected, DC filter 1 filter out the DC power supply V transmittedpvIn alternating component, DC filtering
The capacitance C that device 1 passes through parallel connection direct both ends of powerfIt realizes, while DC power supply VpvPass through capacitance CfCarry out voltage stabilizing so that photovoltaic
The output of array is more stablized.
The output terminal of the input terminal connection DC filter 1 of contactor 2, and connect and be controlled by controller 7, in controller
7 control disconnects or is closed DC power supply Vpv, the control signal of the control can derive from host and either be connect with controller 7
Button etc..
The output terminal of the input terminal connection contactor 2 of dc circuit breaker 3, in DC power supply VpvDirect current is voluntarily disconnected when excessive
Power supply Vpv, play the role of overcurrent protection.
The output terminal of the input terminal connection dc circuit breaker 3 of DC/DC modular converters 4, under control of the controller 7, will be straight
Galvanic electricity source VpvBoost to preset value and be transmitted to power storage module 5 being stored, power storage module 5 is bus capacitor
Cdc, bus capacitor CdcMaximum capacity parameter for 1500uF, 630V, the utility model median generatrix capacitance CdcThe default electricity at both ends
Pressure value is 400V.DC/DC modular converters 4 include inductance Lf, diode D1 and controllable switch S1, inductance LfOne end connection electricity
The DC power supply V of energy generation devicepvAn output terminal, inductance LfOther end connection diode D1 anode, power storage
Module 5 is connected in parallel on the cathode of diode D1 and the DC power supply V of electric energy generation devicepvAnother output terminal between, controllably open
It closes S1 and is connected to inductance LfThe other end and electric energy generation device DC power supply VpvAnother described output terminal it
Between, controllable switch S1 is controlled by controller 7 to carry out the control of break-make.
When controllable switch S1 is in the conduction state, photovoltaic output VPVTo inductance LfCharging, charging current I1, while it is female
Line capacitance CdcOn voltage VdcIt powers to the load, C during power supplydcBe worth more significantly, output voltage UO(i.e. Vdc) variation it is smaller.If
Controlled switch S1Turn-on time in a cycle T is ton, this stage inductance LfThe energy of upper savings is VPVI1ton.When in
V during off-statePVWith with inductance LfJointly to bus capacitor CdcIt charges and provides energy to load.It is located in a cycle T and locates
It is t in the time of off-stateoff, then inductance L during this periodfThe energy of release is (UO-E)I1toff.When circuit works in stable state
When, inductance L in a cycle TfThe energy of savings is equal with the energy discharged, i.e.,
VPVI1ton=(UO-VPV)I1toff
Abbreviation obtains
T/t in formulaoff>=1, to ensure output voltage higher than input voltage, controller 7 is based on power storage module both ends
The preset voltage value 400V and V of acquisitionPV, calculated using above-mentionedValue, and adjust controllable switch S1 and calculated until reaching
'sValue, the actual voltage value at power storage module both ends forms the desired value after adjusting.
Two input terminals of intelligent power module 6 are connected to bus capacitor CdcBoth ends, will be electric in power storage module 5
The alternating current with AC network same frequency can be converted to.Intelligent power module 6 is realized using H bridges, specifically refers to the void in Fig. 2
IGBT in wire frame.Intelligent power module 6 uses fairchild's FSBB15CH60C Series Intelligent power modules, which had/owe
Voltage, mistake/undercurrent detection function, the rated voltage of module, electric current are respectively 600V, 15A.Intelligent power module 6 connects simultaneously
It is controlled by controller 7, carries out the conversion that direct current becomes exchange under control of the controller 7, it will later further about its function
Explanation.
The output terminal of the input terminal connection intelligent power module 6 of LC wave filters 9, is handed over obtaining the output of intelligent power module 6
Galvanic electricity is simultaneously filtered.By taking the frequency of China's AC network is 50Hz as an example, intelligent power module 6 exports the alternating current of 50Hz,
But wherein it is mingled with the electric current of other frequencies, LC wave filters 9 allow the alternating current of 50Hz by preventing the electric current of other frequencies
Pass through.LC wave filters 9 are three-phase and four-line wave filter, to connect three-phase electricity and ground wire respectively.
The output terminal of the input terminal connection LC wave filters 9 of 3P breakers 10, overcurrent protection is carried out to three-phase electricity.
The output terminal of the input terminal connection 3P breakers 10 of transformer 11, by the big ditty of the output voltage of gird-connected inverter
It is made into consistent with the voltage swing of AC network.
Alternating current-direct current detection module 8, connect the DC power supply of electric energy generation device with obtain the DC voltage of DC power supply and
DC current, the DC voltage and DC current detected are transferred to controller 7, and controller 7 is according to alternating current-direct current detection module 8
The front and rear DC voltage acquired twice and DC current control the voltage swing after 4 boosting of DC/DC modular converters to above-mentioned target
Value.Specifically, output power (the DC voltage of electric energy generation device is detected under any voltage value U of power storage module 5
With the product of DC current) Pn-1, then add a voltage disturbance on the basis of this voltage U, then detect electric energy under current state
The output power P of generation devicenIf detect output power PnMore than Pn-1, then every time in the electricity of previous power storage module
Increasing a disturbance in the same direction with voltage disturbance before on the basis of pressure value, (even first time voltage disturbance is U's to update U
On the basis of increase a positive number, then it is follow-up to increase by one on the basis of the previous voltage value of previous power storage module every time just
Number, if first time voltage disturbance is to reduce a positive number on the basis of U, subsequently every time before previous power storage module
Reduce a positive number on the basis of secondary voltage value), until this output power detected detected is not more than previous detection
During the output power arrived, then compare the difference of the output power that the output power of last time is detected with second from the bottom time with
If the difference is more than preset difference value, the voltage at 5 both ends of power storage module is detected towards into second from the bottom time for preset difference value
When voltage U adjustment, otherwise towards last time detect when voltage U adjustment.Such as：Target voltage is 400V, initial voltage U
For 350V, the output of electric energy generation device when increasing 15V every time, and the voltage at 5 both ends of power storage module is represented as U using P (U)
Power, voltage U are updated to 365V, 380V, 395V, 410V, wherein P (410V) ＜ P (395V), and P (395V)-P successively
(410V) ＜ preset difference values then adjust the voltage at 5 both ends of power storage module towards 410V；Target voltage is 400V, initially
Voltage U be 345V, electric energy generation device when increasing 15V every time, and the voltage at 5 both ends of power storage module is represented as U using P (U)
Output power, voltage U is updated to 360V, 375V, 390V, 405V, 420V, wherein P (420V) ＜ P (405V), and P successively
(405V)-P(420V)>Preset difference value, then by the voltage at 5 both ends of power storage module towards 405V adjust, this be in order to avoid
Already exceed the voltage that continues to increase by 5 both ends of adjustment power storage module after desired value and already less than continuing to reduce after desired value
Adjust the voltage at 5 both ends of power storage module.Adjustment herein is based on above-mentionedAdjustment real-time synchronization carry out, and final
Reach a balance.
Alternating current-direct current detection module 9, while the output terminal of transformer 11 is connected to obtain the parallel network reverse of the utility model
Device output voltage and current phase, and for connect with AC network with obtain AC network voltage and current phase
Position.The phase of the voltage and current of the gird-connected inverter output of the utility model that controller 7 is acquired according to alternating current-direct current detection module 8
The phase of the voltage and current of position and AC network, control intelligent power module 6 is so that output and the AC network of transformer 11
With the same phase of pressure.
Gird-connected inverter further includes one for communicating to connect the interface of controller 7 and host so that host is with from controller 7
After obtaining the working condition of gird-connected inverter control instruction is shown and/or sent to controller 7 to adjust gird-connected inverter
Working condition.
The output terminal output electric energy of the transformer 11 of gird-connected inverter, the electric energy of output be directly output to AC load or
Person is exported after AC network to AC load.
The embodiment of the utility model is described above in conjunction with attached drawing, but the utility model is not limited to
The specific embodiment stated, above-mentioned specific embodiment is only schematical rather than restricted, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, these are belonged within the protection of the utility model.
Claims (10)
1. a kind of gird-connected inverter, which is characterized in that include：
DC/DC modular converters, for the DC power supply of electric energy generation device to be boosted；
Power storage module connects DC/DC modular converters, for the DC power supply after boosting to be stored；
Intelligent power module connects power storage module, same with AC network for being converted to electric energy in power storage module
The alternating current of frequency；
Transformer, for by it is described be converted to AC network same frequency alternating current with AC network with the alternating current of voltage after
It is exported；
Alternating current-direct current detection module connects the DC power supply of electric energy generation device to obtain the DC voltage of the DC power supply and straight
Galvanic electricity stream, while the output terminal of transformer is connected to obtain the phase of the voltage and current of the gird-connected inverter output, and
For connect with AC network with obtain AC network voltage and current phase；
Controller connects DC/DC modular converters, alternating current-direct current detection module and intelligent power module respectively, for straight according to handing over
Voltage swing after the DC voltage acquired twice before and after stream detection module and DC current control DC/DC modular converter boostings is extremely
Desired value, and it is used for phase and the institute of the voltage and current exported according to the gird-connected inverter that alternating current-direct current detection module acquires
The phase of the voltage and current of AC network is stated, control intelligent power module so that the output of transformer and AC network are same with pressure
Phase.
2. gird-connected inverter according to claim 1, which is characterized in that further include and handed over for filtering out in the DC power supply
The DC filter of galvanic electricity.
3. gird-connected inverter according to claim 2, which is characterized in that the DC filter is the direct current in parallel
The capacitance at source both ends.
4. gird-connected inverter according to claim 2, which is characterized in that further include：For excessive in the DC power supply
The dc circuit breaker of the Shi Zihang disconnections DC power supply and connection are simultaneously controlled by the controller to disconnect the direct current
The contactor of the dc circuit breaker in source, the dc circuit breaker and the contactor are connected to the DC filter and DC/
Between DC modular converters.
5. gird-connected inverter according to claim 1, which is characterized in that the transformer and the intelligent power module
Between be also associated with for the breaker of overcurrent protection and for filtering out included in the output of the intelligent power module
With the LC wave filters of AC network different frequency electric current.
6. gird-connected inverter according to claim 5, which is characterized in that the output of the intelligent power module is three-phase
Electricity, the breaker connected between the transformer and the intelligent power module are 3P breakers, and the LC wave filters are three
Four line filter of phase, to connect three-phase electricity and ground wire respectively.
7. gird-connected inverter according to claim 1, which is characterized in that the power storage module is bus capacitor.
8. gird-connected inverter according to claim 1, which is characterized in that the DC/DC modular converters include inductance, two poles
Pipe and controllable switch, one end of inductance are used to connect an output terminal of the DC power supply of electric energy generation device, inductance it is another
One end connects the anode of diode, and power storage module is connected in parallel on the cathode of diode and the DC power supply of electric energy generation device
Between another output terminal, controllable switch is connected to the institute of the other end of inductance and the DC power supply of electric energy generation device
Between stating another output terminal, the controllable switch is controlled by controller to carry out the control of break-make.
9. gird-connected inverter according to claim 8, which is characterized in that the power storage module is output voltage UOIt is full
Foot：
In formula, T=ton+toff, ton、toffRespectively controllable switch conducting and the time disconnected, VPVFor the straight of electric energy generation device
Voltage between the output terminal of two, galvanic electricity source；
The V of preset voltage value and acquisition of the controller based on power storage module both endsPV, utilize formula
It calculatesValue, and controllable switch is adjusted until reaching what is calculatedValue, the reality at power storage module both ends after adjusting
Voltage value forms the desired value.
10. gird-connected inverter according to claim 1, which is characterized in that further include one for communicating to connect the control
The interface of device and host so that the host is to be shown after the working condition of the gird-connected inverter is obtained from the controller
Show and/or send control instruction to the controller to adjust the working condition of the gird-connected inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721349231.9U CN207603231U (en) | 2017-10-17 | 2017-10-17 | A kind of gird-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721349231.9U CN207603231U (en) | 2017-10-17 | 2017-10-17 | A kind of gird-connected inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207603231U true CN207603231U (en) | 2018-07-10 |
Family
ID=62756213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721349231.9U Expired - Fee Related CN207603231U (en) | 2017-10-17 | 2017-10-17 | A kind of gird-connected inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207603231U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107634539A (en) * | 2017-10-17 | 2018-01-26 | 中国地质大学（武汉） | A kind of combining inverter |
| CN110149063A (en) * | 2019-04-26 | 2019-08-20 | 科华恒盛股份有限公司 | Gird-connected inverter current controlled circuit setting device and method |
-
2017
- 2017-10-17 CN CN201721349231.9U patent/CN207603231U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107634539A (en) * | 2017-10-17 | 2018-01-26 | 中国地质大学（武汉） | A kind of combining inverter |
| CN110149063A (en) * | 2019-04-26 | 2019-08-20 | 科华恒盛股份有限公司 | Gird-connected inverter current controlled circuit setting device and method |
| CN110149063B (en) * | 2019-04-26 | 2021-01-01 | 科华恒盛股份有限公司 | Current control loop setting device and method for grid-connected inverter |
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