CN207339294U - The gird-connected inverter of current source/voltage source double mode output - Google Patents
The gird-connected inverter of current source/voltage source double mode output Download PDFInfo
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- CN207339294U CN207339294U CN201721274790.8U CN201721274790U CN207339294U CN 207339294 U CN207339294 U CN 207339294U CN 201721274790 U CN201721274790 U CN 201721274790U CN 207339294 U CN207339294 U CN 207339294U
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Abstract
A kind of gird-connected inverter of current source/voltage source double mode output is the utility model is related to, belongs to inverter technology field.Which solve.The utility model includes control unit, detection unit I, driving unit, detection unit II and grid-connected switch, detection unit I is between direct-flow input end and four-quadrant inverter, the AC signal that LCL type wave filter exports is fed back to control unit by the direct current signal of direct-flow input end, detection unit II by detection unit I respectively, and control signal is delivered to four-quadrant inverter by control unit by driving unit；Grid-connected switch is between LCL type wave filter and ac output end.The utility model under grid-connect mode can normal power generation, because power grid extremely be used as general distribution power supply, greatly improve the economic benefit of photovoltaic plant/wind power plant；APF/ dynamic harmonic eliminating passive compensators can be used as, improve the power supply quality and impact resistance of power grid, so the utility model has great social benefit.
Description
Technical field
A kind of gird-connected inverter of current source/voltage source double mode output is the utility model is related to, belongs to inverter technology
Field.
Background technology
The gird-connected inverter of current source/voltage source double mode output has used more control units in forward position to export undisturbed and has cut
Technology is changed, DC power supply is converted into suitable AC power, and Auto-matching loadtype, automatically selects grid-connected/off-network mould
Formula.
The grid-connected inverting system such as parallel network reverse technology, existing photovoltaic, wind-powered electricity generation uses the technology：It is by inverter design
Invariable power/current source type output, uses unity power factor control strategy.Simultaneously because need to solve many grid-connected other tools
Body technique problem, also using fundamental extraction technology, Phase Lock Technique, the isolated island detection of such as sine wave and corresponding signal processing
Technology etc..Problems and disadvantages：(1) occur island effect i.e. grid power blackout when, inverter can not work, and need to supply at this time
All multi-loads of electricity have to be in power failure state；(2) during inverter startup, unity power factor control strategy can not make off-network
The output voltage of the inverter of pattern smoothly rises, and the quality of inverter output voltage waveform is very low at this time, causes grid-connected
The impact of moment is larger；(3) during inverter startup, it is necessary to which the reactive load of configuration such as capacitance etc produces idle output electricity
Stream, not so unity power factor control strategy can not work normally, and this extra reactive load reduces the effect of inverter
Rate, adds trouble point.
The inversion system such as off-network inverter technology, existing frequency converter, UPS, general inverter, EPS uses the technology：
The control strategy used is to export inverter design for voltage-source type, uses space vector of voltage control strategy or traditional PI D
Control strategy, that realizes inverter has the output of cut-off current characteristics controllable voltage.Problems and disadvantages：(1) Constant Current Load is run into, it is such
Inverter can not ensure normally to export；(2) parallel technology of such inverter is complex, it is necessary to the processing of additional flow equalizing ring,
Failure rate is higher, can not be normally in parallel when quantity in parallel is more；(3) such inverter can not be grid-connected.
Utility model content
In view of the foregoing defects the prior art has, the utility model proposes a kind of current source/voltage source double mode is defeated
The gird-connected inverter gone out, which solves the problem of gird-connected inverter can not work in grid power blackout；When gird-connected inverter starts
Output electric energy is poor, the problem of grid-connected moment impact is larger；Gird-connected inverter opens the problem of time motion efficiency is relatively low；Off-network type is inverse
Become the paralleling problems of device；The problem of off-network type inverter can not be with Constant Current Load；The problem of off-network type inverter cannot be grid-connected.
The utility model is realized using following technical solution：Current source/voltage source described in the utility model is double
Pattern output gird-connected inverter, including be sequentially connected direct-flow input end, four-quadrant inverter, LCL type wave filter with exchange
Output terminal, further includes control unit, detection unit I, driving unit, detection unit II and grid-connected switch, control unit and connects respectively
Detection unit I, driving unit and detection unit II are connect, detection unit I is between direct-flow input end and four-quadrant inverter, inspection
Unit I is surveyed to feed back to the AC signal that the direct current signal of direct-flow input end, detection unit II export LCL type wave filter respectively
Control signal is delivered to four-quadrant inverter by control unit, control unit by driving unit；Grid-connected switch is filtered positioned at LCL type
Between ripple device and ac output end.
Preferably, described control unit includes carefree switching switch, space vector of voltage control unit, specific work because of control
Unit, logic control element, SVPWM generation units, carefree switching switch respectively with space vector of voltage control unit, specific work
Because control unit, logic control element, SVPWM generation units are connected.
Preferably, the grid-connected switching generates electricity to power grid, four-quadrant grid-connected inverters；Off-grid is negative when power grid is abnormal
Carry and voltage stabilization and frequency stabilization power supply is provided.
Preferably, the four-quadrant inverter is the UPS of core structure, when power grid is normal, is using energy-storage system
APF/ dynamic harmonic eliminating passive compensators；When power grid is abnormal, off-grid provides voltage stabilization and frequency stabilization power supply to load.
Preferably, the four-quadrant inverter is direct current cabinet power supply/electric car charger of core structure, gives storage battery group
During charging, the DC power supply for being operated in rectification mode offer voltage stabilizing current limliting charges to battery pack；When battery pack has been filled, automatically
Parallel network reverse pattern is switched to, APF/ dynamics harmonic eliminating passive compensator and peaking power source as power grid.
The beneficial effects of the utility model are：Using current source described in the utility model/voltage source double mode output
Gird-connected inverter, using photovoltaic/wind-electricity integration inverter of the innovative technology, under grid-connect mode can normal power generation, because of power grid
, can be as common AC power to load supplying in photovoltaic plant/wind power plant, in current state during abnormal or other reason off-networks
Interior generation of electricity by new energy is abandoned light and is abandoned under the more serious environment of net, which can greatly improve photovoltaic plant/wind power plant
Economic benefit；Using the general inverter of the innovative technology, APF/ dynamic harmonic eliminating passive compensators can be used as, improve the confession of power grid
Electricity quality and impact resistance, so the utility model has great social benefit.
Brief description of the drawings
Fig. 1 is the utility model structural principle block diagram.
Fig. 2 is the electrical connection diagram of four-quadrant inverter.
Fig. 3 is control unit structural principle block diagram.
In figure：1st, direct-flow input end；2nd, four-quadrant inverter；3rd, LCL type wave filter；4th, ac output end；5th, it is grid-connected to open
Close.
Embodiment
In order to which the utility model aim, technical solution is more clearly understood, with reference to embodiment, to the utility model
It is described in further detail.
As shown in Figure 1, the gird-connected inverter of current source described in the utility model/voltage source double mode output, including according to
Secondary connected direct-flow input end 1, four-quadrant inverter 2, LCL type wave filter 3 and ac output end 4, further include control unit, inspection
Survey unit I, driving unit, detection unit II and grid-connected switch 5, control unit difference connecting detection unit I, driving unit and inspection
Unit II is surveyed, detection unit I is between direct-flow input end 1 and four-quadrant inverter 2, and detection unit I is by direct-flow input end 1
The AC signal that LCL type wave filter 3 exports is fed back to control unit by direct current signal, detection unit II respectively, and control unit is led to
Control signal is delivered to four-quadrant inverter 2 by over-drive unit；Grid-connected switch 5 is located at LCL type wave filter 3 and ac output end
Between 4.
As shown in Fig. 2, in the topological structure of three-phase dual mode inverter, the direct current signal that direct-flow input end 1 inputs passes through
It is connected after three phase full bridge inversion by LCL filter with grid-connected switch 5, the grid-connected selection of switch 5 is connected to the grid or is directly connected to
Load, that is, select grid-connected or off-network.In Fig. 2, LCL type wave filter 3 is third-order filter, in less filter parameter
In the case of still can guarantee that preferable filtering performance, can preferably filter out higher hamonic wave, have especially for switching frequency subharmonic
Preferable filter effect, and restricted for large capacity inverter, device for power switching by switching frequency and loss, switching frequency
Decline, LCL type wave filter 3 is avoided that single increase L filtering and increases wave filter volume and cost.
The grid-connected switch 5 is switched to power grid, and four-quadrant inverter 2 generates electricity by way of merging two or more grid systems；Off-grid carries for load when power grid is abnormal
Power for voltage stabilization and frequency stabilization.The four-quadrant inverter 2 is the UPS of core structure, when power grid is normal, is using energy-storage system
APF/ dynamic harmonic eliminating passive compensators；When power grid is abnormal, off-grid provides voltage stabilization and frequency stabilization power supply to load.The four-quadrant inverter
2 for core structure direct current cabinet power supply/electric car chargers, during to battery charging, be operated in rectification mode and voltage stabilizing be provided
The DC power supply of current limliting charges to battery pack；When battery pack has been filled, parallel network reverse pattern is automatically switched to, as power grid
APF/ dynamics harmonic eliminating passive compensator and peaking power source.
As shown in figure 3, described control unit include carefree switching switch, space vector of voltage control unit, specific work because
Control unit, logic control element, SVPWM generation units, carefree switching switch respectively with space vector of voltage control unit, list
Position work(is connected because of control unit, logic control element, SVPWM generation units.
The utility model is directed to the defects of existing technology, solves following technical problem：Gird-connected inverter is in grid power failure
The problem of can not working when electric；The problem of output electric energy when gird-connected inverter starts is poor, grid-connected moment impact is larger；It is grid-connected
The problem of less efficient during inverter startup；The paralleling problems of off-network type inverter；Off-network type inverter can not be with Constant Current Load
The problem of；The problem of off-network type inverter cannot be grid-connected.
The utility model is using photovoltaic/wind-powered electricity generation gird-connected inverter that the inverter is that core is built, when power grid is normal
Can generate electricity by way of merging two or more grid systems, when power grid is abnormal can off-grid provide voltage stabilization and frequency stabilization power supply to load；Built using the inverter for core
UPS, when power grid is normal, can be helped to lift the confession of power grid as APF/ dynamic harmonic eliminating passive compensators by the use of energy-storage system
Electricity quality and impact resistance, power grid it is abnormal when can off-grid provide voltage stabilization and frequency stabilization power supply to load；It is using the inverter
Direct current cabinet power supply/electric car charger of core structure, during to battery charging, is operated in rectification mode and provides voltage stabilizing current limliting
DC power supply give battery pack charging, when battery pack has been filled, automatically switch to parallel network reverse pattern, can be as power grid
APF/ dynamics harmonic eliminating passive compensator and peaking power source use.
The technology of the utility model is on the basis of existing gird-connected inverter and off-network type inverter, incorporates one kind
Existing unity power factor control technology, sine wave have been merged in the hardware circuit of four-quadrant inverter 2, hardware circuit innovation
Fundamental extraction technology, Phase Lock Technique, isolated island detection technique, space vector of voltage control technology etc..Detected, judged by isolated island
The pattern of control strategy, in two kinds of control mode switchs of voltage source and current source, creative introduces based on speed point
The no-harass switch method of solution, ensure that the stable operation of system.
The above is only the preferred embodiment of the present invention and oneself, not using the utility model as limitation, it is all this
Impartial modifications, equivalent substitutions and improvements made within the spirit and principle of utility model etc., should be included in the utility model
Patent covering scope in.
Claims (5)
1. a kind of current source/gird-connected inverter of voltage source double mode output, including be sequentially connected direct-flow input end (1), four
Quadrant inverter (2), LCL type wave filter (3) and ac output end (4), it is characterised in that further include control unit, detection list
Member I, driving unit, detection unit II and grid-connected switch (5), control unit difference connecting detection unit I, driving unit and detection
Unit II, detection unit I are located between direct-flow input end (1) and four-quadrant inverter (2), and detection unit I is by direct-flow input end
(1) AC signal that LCL type wave filter (3) exports is fed back to control unit by direct current signal, detection unit II respectively, control
Control signal is delivered to four-quadrant inverter (2) by unit by driving unit；Grid-connected switch (5) is located at LCL type wave filter (3)
Between ac output end (4).
2. the gird-connected inverter of current source according to claim 1/voltage source double mode output, it is characterised in that described
Control unit include carefree switching switch, space vector of voltage control unit, specific work because control unit, logic control element,
SVPWM generation units, carefree switching switch is respectively with space vector of voltage control unit, specific work because of control unit, logic control
Unit processed, SVPWM generation units are connected.
3. the gird-connected inverter of current source according to claim 1/voltage source double mode output, it is characterised in that described
Grid-connected switch (5) is switched to power grid, and four-quadrant inverter (2) generates electricity by way of merging two or more grid systems；To there is provided voltage stabilizing steady to load for off-grid when power grid is abnormal
Frequency is powered.
4. the gird-connected inverter of current source according to claim 1/voltage source double mode output, it is characterised in that described
Four-quadrant inverter (2) is the UPS of core structure, is the idle benefit of APF/ dynamic harmonic eliminations using energy-storage system when power grid is normal
Repay device；When power grid is abnormal, off-grid provides voltage stabilization and frequency stabilization power supply to load.
5. the gird-connected inverter of current source according to claim 1/voltage source double mode output, it is characterised in that described
Four-quadrant inverter (2) is direct current cabinet power supply/electric car charger of core structure, during to battery charging, is operated in whole
The DC power supply that stream mode provides voltage stabilizing current limliting charges to battery pack；When battery pack has been filled, parallel network reverse is automatically switched to
Pattern, APF/ dynamics harmonic eliminating passive compensator and peaking power source as power grid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721274790.8U CN207339294U (en) | 2017-09-29 | 2017-09-29 | The gird-connected inverter of current source/voltage source double mode output |
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| CN201721274790.8U CN207339294U (en) | 2017-09-29 | 2017-09-29 | The gird-connected inverter of current source/voltage source double mode output |
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| CN207339294U true CN207339294U (en) | 2018-05-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868089A (en) * | 2019-12-24 | 2020-03-06 | 新风光电子科技股份有限公司 | Controllable direct-current power supply and control method thereof |
| CN113595137A (en) * | 2021-07-20 | 2021-11-02 | 科华数据股份有限公司 | Direct current source grid-connected power generation mode switching method and device and direct current source system |
-
2017
- 2017-09-29 CN CN201721274790.8U patent/CN207339294U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868089A (en) * | 2019-12-24 | 2020-03-06 | 新风光电子科技股份有限公司 | Controllable direct-current power supply and control method thereof |
| CN110868089B (en) * | 2019-12-24 | 2021-08-13 | 新风光电子科技股份有限公司 | Controllable direct-current power supply and control method thereof |
| CN113595137A (en) * | 2021-07-20 | 2021-11-02 | 科华数据股份有限公司 | Direct current source grid-connected power generation mode switching method and device and direct current source system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Grid -connected inverter of double mode output of electric current source / voltage source Effective date of registration: 20200430 Granted publication date: 20180508 Pledgee: Qingdao Changyang financing Company limited by guarantee Pledgor: QINGDAO LDC TECHNOLOGY Co.,Ltd. Registration number: Y2020370010013 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20210310 Granted publication date: 20180508 Pledgee: Qingdao Changyang financing Company limited by guarantee Pledgor: QINGDAO LDC TECHNOLOGY Co.,Ltd. Registration number: Y2020370010013 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |