CN108321836A - A kind of topological structure that multigroup single-phase inversion unit is grid-connected - Google Patents
A kind of topological structure that multigroup single-phase inversion unit is grid-connected Download PDFInfo
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- CN108321836A CN108321836A CN201710032985.XA CN201710032985A CN108321836A CN 108321836 A CN108321836 A CN 108321836A CN 201710032985 A CN201710032985 A CN 201710032985A CN 108321836 A CN108321836 A CN 108321836A
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- unit
- inversion unit
- phase
- isolation
- inversion
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- 238000002955 isolation Methods 0.000 claims abstract description 35
- 230000009466 transformation Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract 2
- 230000005611 electricity Effects 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Classifications
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- H02J3/383—
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- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H02J3/386—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
Patent of the present invention discloses a kind of topological structure that the multigroup single-phase inversion unit applied in micro-grid system is grid-connected, by at least one DC/DC converter units, one shared DC bus, one non-isolated inversion unit, one sensor unit, at least one isolation inversion unit and at least one control unit composition.In the actual use of micro-capacitance sensor, the main source of power generation is the new energy such as photovoltaic or wind-force, due to the limitation of actual installation area and place, the inversion unit of 3 5KW of traditional output power only has single-phase inversion device, and alternating current is 380V three-phase four-wire systems and has larger three-phase imbalance feature, even if also being difficult to realize each phase power generation using three-phase inversion unit and load matches and economical operation, in addition, multigroup single-phase inversion module is connected to the grid due to the presence of inverter bridge leg simultaneously, it may cause phase fault, therefore each group single-phase inversion unit can be mutually isolated and with a kind of new device of control each group inversion unit output power and load matched by needing one, to reach, micro-capacitance sensor is energy saving and the maximized operating mode of economical operation.
Description
Technical field
The present invention relates to micro-grid systems to generate electricity by way of merging two or more grid systems, and in particular to is asked to the three-phase mismatch solved in practical micro-capacitance sensor
Topic, when promoting the service efficiency of the generations of electricity by new energy such as photovoltaic or wind-force, and preventing multigroup single-phase inversion unit and three phase network
Phase fault problem.
Background technology
At present in the application that micro-capacitance sensor is incorporated to three phase network, the main source that generates electricity uses the new energy such as photovoltaic or wind-force,
Due to the limitation of actual installation area and place, the inversion unit of traditional output power 3-5KW only has single-phase inversion device, it is difficult to
Realize the matching of each phase power, if new energy electrical power be less than load power, can opposite tide be transported to power grid, be micro-capacitance sensor
User's energy-saving run relatively difficult to achieve.Even if installing three-phase inverter, due to being controlled using tradition SVPWM, thirdly opposite feed
Stream requires unanimously, therefore DC-to-AC converter is less efficient, it is more difficult to realize energy saving maximized use pattern.
In engineer application, more difficult each phase load of accurate judgement when due to installation, even if measuring loading condition at that time, accurately
Install single-phase inversion unit to the tie point of a certain item on, also can not guarantee section load short-term standby or working condition not
With caused actual loading change conditions, there is also the case where load is increased or decreased successively in actual power grid, can also make
At the variation being supported between out of phase.
When more non-isolated single-phase inversion units are grid-connected, due to the presence of inverter bridge leg, it may be asked due to opening for bridge arm
Topic leads to power grid phase fault problem.
This patent is exactly the three-phase imbalance characteristic how reply solves power grid using micro-capacitance sensor, promotes micro-capacitance sensor and uses effect
Rate, and effectively prevent multigroup inversion unit and when three phase network, generated due to phase fault problem caused by inverter bridge leg.
Invention content
This patent is by a kind of special isolated topology connection type, and three when effective solution micro-grid connection uses
Phase disequilibrium, the output power of the corresponding each group inversion unit of loading condition control by identifying each phase, realizes photovoltaic or wind
The service efficiency of the generations of electricity by new energy such as power, to realize energy saving maximization.
This patent is the technical scheme adopted is that by a sensor unit, and a DC/DC converter unit, one shares
DC bus, a non-isolated inversion unit, it is at least one isolation inversion unit and at least one control unit composition
Isolated topology structure, each phase load current conditions for being detected by control unit receiving sensor unit control each group inversion list
The output power of member, it is effective to promote power match ability of the micro-capacitance sensor to load.
The isolation inversion unit of this patent, including high-frequency isolation inversion unit and low frequency isolation inversion unit two types,
Every group of high-frequency isolation inversion unit is made of a high-frequency isolation transformer unit and a single-phase inversion unit, and high-frequency isolation becomes
Pressure unit primary side connects the output of DC/DC converter units, and secondary side connects the input terminal of single-phase inversion unit, single-phase inversion unit
Output end accesses power grid；Every group of low frequency isolation inversion unit is by a low frequency isolation transformer unit and a single-phase inversion unit
Composition, the output end of the input termination DC/DC converters of single-phase inverter, the output of single-phase inverter terminate low frequency isolation transformation
The primary side of device unit, secondary side access power grid.
The DC/DC converter units of this patent, are isolated inversion unit, and non-isolated inversion unit and control unit are independent
, can be according to the loading demand of practical three phase network, matched combined, the control unit of the present apparatus include at least a set of DSP or
The processing unit of ARM and interlock circuit, to control the working condition of each group inversion unit, to realize output and network load phase
Matching, more than two sets of processing units, between processing unit, the communication of control unit and other units by including but
The digital communication modes such as CAN, RS485 are not limited to connect.
Description of the drawings
With reference to the accompanying drawings and examples to this further explanation：
Fig. 1 high-frequency isolation topological structures
Fig. 2 low frequency isolation topology inversions
The micro-capacitance sensor application of Fig. 3 multichannel photovoltaics input
The internal structure of Fig. 4 control units.
Specific implementation mode
The following further describes the present invention with reference to the drawings.
It is the high-frequency isolation topological structure of this patent as shown in Figure 1, by a DC/DC converter unit, one shared straight
Flow busbar, a non-isolated inversion unit, a sensor unit, at least one high-frequency isolation inversion unit and at least one
Control unit forms, which has just been mutually isolated after DC bus, and wherein isolating transformer is become using high-frequency isolation
Depressor.
It is illustrated in figure 2 the low frequency isolation topological structure of this patent, by a DC/DC converter unit, one shared straight
Flow busbar, a non-isolated inversion unit, a sensor unit, at least one low frequency isolation inversion unit and at least one
Control unit forms, and is isolated after the topology inverter, and wherein isolating transformer uses power frequency isolation transformer.
The input terminal of micro-capacitance sensor as shown in Figure 3 is segmented into the parallel connection of multigroup generation of electricity by new energy group according to actual conditions, such as
Multigroup solar panel combination or solar panel find Unit Combination with wind-force, while as power input, every group of hair
Electric equipment individually connects DC/DC converter units, after the output end parallel connection access DC bus of all DC/DC converter units with this patent
Isolated topology structure be connected.
Control core of the control unit as this patent isolated topology structure as shown in Figure 4 can use individually by ARM
Or the processing unit of DSP and interlock circuit composition controls the work of three-phase inversion unit, can also use multigroup processing
Unit respectively controls the inversion unit of each phase, by including but not limited to CAN, RS485 between multigroup processing unit
Digital communication modes are waited to be communicated.
Claims (9)
1. a kind of topological structure that multigroup single-phase inversion unit is grid-connected, which is characterized in that single comprising at least one DC/DC transformation
Member, a shared DC bus, a non-isolated inversion unit, a sensor unit, at least one isolation inversion unit
And at least one control unit.
2. non-isolated inversion unit according to claim 1, it is characterised in that the input terminal of inversion unit is directly and direct current
Busbar is connected, and output end accesses any one phase of power grid.
3. DC bus according to claim 2, which is characterized in that one non-isolated DC/DC converter unit of connection
The voltage range of output end, DC bus is 16V -900V.
4. according to the non-isolation DC described in claim 3/DC converter units, which is characterized in that comprising at least one with most
High-power tracking（MPPT）The non-isolation DC of algorithm/DC translation circuits.
5. isolated inverter unit according to claim 1, which is characterized in that have high-frequency isolation and two kinds of sides of low frequency isolation
Formula realizes the function of isolation by transformer and interlock circuit, and each isolation inversion unit includes an independent inversion
Circuit.
6. high-frequency isolation according to claim 5, which is characterized in that by least one high-frequency isolation transformer unit into
Row isolation, the primary side of each transformer unit connect DC bus, the input terminal of the only one group of isolation inversion unit of secondary side order,
The output end that inversion unit is isolated accesses not with non-isolated inversion unit output end in identical phase power grid circuit.
7. low frequency isolation according to claim 5, which is characterized in that by least one low frequency isolation transformer unit into
Row isolation, the primary side of each transformer connect the output end of corresponding isolation inversion unit, secondary side access and non-isolated transformation
In the different power grid circuit of device output end, and it is all isolation inversion unit input terminal and couple DC bus.
8. sensor unit according to claim 1, it is characterised in that be made of three CT current sensors, be connected on respectively
Per the common end before phase power grid loop load, to detect the current conditions of threephase load, and output current signal.
9. control unit according to claim 1, which is characterized in that including at least a set of containing DSP or ARM and mutually powered-down
The processing unit on road judges power grid real time load situation by the current signal of receiving sensor unit, and controls each group inversion
The output power of unit is matched with realizing to export with network load, i.e. between total power input and power grid difference phase load
When matching, the communication of control unit and other units, and existing in a control unit more than two sets of processing units, between processing unit
Communication, connected by digital communication modes such as including but not limited to CAN, RS485.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710032985.XA CN108321836A (en) | 2017-01-18 | 2017-01-18 | A kind of topological structure that multigroup single-phase inversion unit is grid-connected |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710032985.XA CN108321836A (en) | 2017-01-18 | 2017-01-18 | A kind of topological structure that multigroup single-phase inversion unit is grid-connected |
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| CN108321836A true CN108321836A (en) | 2018-07-24 |
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| CN201710032985.XA Pending CN108321836A (en) | 2017-01-18 | 2017-01-18 | A kind of topological structure that multigroup single-phase inversion unit is grid-connected |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444621A (en) * | 2018-10-01 | 2019-03-08 | 徐州中矿大传动与自动化有限公司 | A kind of high-power NPC three-level inverter power module electric current online test method |
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| JPH09149650A (en) * | 1995-11-24 | 1997-06-06 | Meidensha Corp | Multiple inverter |
| CN103633661A (en) * | 2012-08-23 | 2014-03-12 | 上海康威特吉能源技术有限公司 | New energy power generation system and distributed mixing maximum power tracking method |
| CN103915852A (en) * | 2014-04-08 | 2014-07-09 | 中国计量学院 | Flexible switching system based on single-phase grid-connected inverter and switching method thereof |
| CN105429168A (en) * | 2015-11-05 | 2016-03-23 | 国网冀北电力有限公司张家口供电公司 | Electric energy quality treatment method based on AC/DC hybrid power supply network |
| CN105449709A (en) * | 2015-12-02 | 2016-03-30 | 上海电力学院 | Grid-connected control method for photovoltaic power generation system |
-
2017
- 2017-01-18 CN CN201710032985.XA patent/CN108321836A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09149650A (en) * | 1995-11-24 | 1997-06-06 | Meidensha Corp | Multiple inverter |
| CN103633661A (en) * | 2012-08-23 | 2014-03-12 | 上海康威特吉能源技术有限公司 | New energy power generation system and distributed mixing maximum power tracking method |
| CN103915852A (en) * | 2014-04-08 | 2014-07-09 | 中国计量学院 | Flexible switching system based on single-phase grid-connected inverter and switching method thereof |
| CN105429168A (en) * | 2015-11-05 | 2016-03-23 | 国网冀北电力有限公司张家口供电公司 | Electric energy quality treatment method based on AC/DC hybrid power supply network |
| CN105449709A (en) * | 2015-12-02 | 2016-03-30 | 上海电力学院 | Grid-connected control method for photovoltaic power generation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444621A (en) * | 2018-10-01 | 2019-03-08 | 徐州中矿大传动与自动化有限公司 | A kind of high-power NPC three-level inverter power module electric current online test method |
| CN109444621B (en) * | 2018-10-01 | 2021-04-09 | 徐州中矿大传动与自动化有限公司 | Online detection method for power module current of high-power NPC three-level inverter |
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