CN205986183U - Topological photovoltaic shunt chopper of sharing electric capacity - Google Patents
Topological photovoltaic shunt chopper of sharing electric capacity Download PDFInfo
- Publication number
- CN205986183U CN205986183U CN201620821789.1U CN201620821789U CN205986183U CN 205986183 U CN205986183 U CN 205986183U CN 201620821789 U CN201620821789 U CN 201620821789U CN 205986183 U CN205986183 U CN 205986183U
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- unit
- inductance
- branch road
- product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Classifications
-
- 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
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model provides a topological photovoltaic shunt chopper of sharing electric capacity, includes multichannel grid -connected PV inverter unit, and every way grid -connected PV inverter unit solitary interchange output LC filtering unit of establishing ties respectively forms the branch road, and the back level of more branch parallel outlet end has connect a sharing electric capacity unit, and the output of sharing electric capacity unit is connected with the electric wire netting, the LC filtering of each branch road self output with parallelly connected after share the electric capacity unit filter capacitance and electric wire netting side equivalent inductance is whole constitutes LCCL type filtering structure because the electric capacity of sharing electric capacity unit and each branch road filter capacitance are for parallelly connected relation, so still be LCL type filtering structure on the whole, the inductance that exchanges output LC filtering unit and the product of electric capacity equal the product that the electric capacity of electric capacity unit was used together to electric wire netting side inductance, and the product of the side of contravariant promptly inductance and electric capacity equals the product of net side inductance and electric capacity, and this LCL type filtering structure's resonant frequency will can not change along with the change of branch road number.
Description
Technical field
This utility model be related to photovoltaic shunt chopper technical field and in particular to a kind of photovoltaic of shared capacitor topology simultaneously
Connection inverter.
Background technology
Regenerative resource replaces traditional fossil energy at present is just becoming the major trend of world energy sources development.Economical for solving
The needs of development and the environmental problem thus brought, the installed capacity of domestic photovoltaic plant is developed rapidly in recent years.Especially
It becomes the main flow of development in northwest province, large-sized photovoltaic power station.With the continuous increase of photovoltaic plant capacity, for reducing photovoltaic
Cost of electricity-generating, inverter single-machine capacity increases therewith, and modular parallel unit and multi-machine parallel connection inverter system become a kind of skill
The trend of art development.By carrying out the high-frequency synchronous of carrier wave between many (module) machine, many (module) machine can be cut down to the full extent
Circulation problem that parallel connection brings is it is ensured that the successful realization of many (module) machine parallelly connected reverse converter system.
Photovoltaic combining inverter, in order to ensure the quality of grid-connected current, mainly adopts LCL filter to replace single L filtering at present
Filtering to inverter output current medium-high frequency carrier wave composition etc. realized by device, but LCL filter has resonance and makes system control
Become complicated.Traditional many (module) machine parallelly connected reverse converter system is the direct parallel connection between single (module) machine on constituting, this side
Case in actual applications, with and machine (module) number of units increase, LCL filter of many (module) machine parallelly connected reverse converter system etc.
Effect parameter changes, and leads to system resonance frequencies to be gradually lowered.To being mounted with passive damping unit or devise active damping
The system of control algolithm, the skew of LCL resonant frequency will greatly reduce damping expected from system, thus affecting wave filter
Filter effect, even result in system unstability.
Content of the invention
In order to solve the problems, such as above-mentioned prior art, this utility model provides a kind of photovoltaic of shared capacitor topology simultaneously
Connection inverter, solves the increase with simultaneously machine (module) number of units for the prior art, the LCL of many (module) machine parallelly connected reverse converter system
Wave filter equivalent parameterss change, and lead to the problem that system resonance frequencies are gradually lowered.
In order to achieve the above object, this utility model adopts the following technical scheme that：
A kind of photovoltaic shunt chopper of shared capacitor topology, including multichannel photovoltaic grid-connected inversion unit, every road photovoltaic is simultaneously
Net inversion unit is connected respectively and is individually exchanged output LC filter unit, forms branch road, the rear class of multiple branch circuit parallel connection outfans
It is connected to a shared capacitor cell, the outfan of shared capacitor cell is connected with electrical network；The LC filtering of each branch road itself output
With in parallel after share the filter capacitor of capacitor cell and grid side equivalent inductance is monolithically fabricated LCCL type filter structure, due to sharing
The electric capacity of capacitor cell and each branch road filter capacitor are parallel relationship, therefore are still LCL type filter structure on the whole；Described exchange is defeated
The product of the inductance and electric capacity that go out LC filter unit is equal to the product that grid side inductance uses the electric capacity of capacitor cell together, i.e. inversion
The product of side inductance and electric capacity is equal to the product of net side inductance and electric capacity, and the resonant frequency of this LCL type filter structure will not be with
The change of branch road number and change.
In the system adding passive damping hardware unit, described passive damping unit is added on shared capacitor cell position
Put, that is, ensure that the quantity obtaining enough dampings and cutting down passive damping unit.
This utility model compared with prior art, has the advantage that：
In this utility model, each branch road, in addition to having independent LC wave filter, shares a filtering also after its parallel connection
Electric capacity, the LC filtering of each parallel module itself output with parallel after public filter capacitor and net side equivalent inductance be monolithically fabricated
The filter structure of LCCL type.This photovoltaic shunt chopper has advantages below：
1) because the electric capacity sharing capacitor cell is parallel relationship with each branch road filter capacitor, therefore system filter is in entirety
On still be LCL type filter structure.When the product ensureing inverter side inductance and electric capacity is equal to the product of net side inductance and electric capacity, should
The resonant frequency of LCL type filter structure will not change with the change of branch road number.In actual applications, as long as ensureing
Above-mentioned two product approximately equal or both differences are in certain scope, you can ensure resonant frequency excursion very little, from
Fundamentally solve the problems, such as that parameter changes with structure change it is ensured that expected damping, reduce system unstability
Risk.
2) in this scenario, the product of inverter side inductance and electric capacity is approximately equal to the product of net side inductance and electric capacity, and inverse
Become side inductance and be typically much deeper than net side equivalent inductance, thus the capacitance sharing electric capacity after multiple module paralleling to will be greater than each parallel module inverse
Becoming the capacitance of top-cross stream filter capacitor, so can significantly cutting down the capacitance of inverter side ac filter electric capacity, thus reducing system
The cost of system.
3) adopt this topological project, in the type adding passive damping hardware unit, only passive damping unit need to be added
It is added in shared capacitor cell position can ensure to obtain enough dampings, the quantity due to sharing electric capacity is considerably less than inversion
The quantity of top-cross stream filter capacitor, therefore, can will greatly cut down the quantity of passive damping unit using the program, thus cutting
Subtract the cost in this aspect for the system.
Brief description
Fig. 1 shares capacitor topology shunt chopper block diagram for this utility model.
Fig. 2 is this utility model equivalent circuit.
Fig. 3 is the resonant frequency variation diagram with system during the simultaneously increase of machine quantity for the former scheme.
Fig. 4 is the resonant frequency variation diagram with the simultaneously increase system of machine quantity for this utility model scheme.
Fig. 5 is the damping configuration of former scheme many (module) machine parallel passive.
Fig. 6 is the damping configuration of this utility model scheme many (module) machine parallel passive.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, this utility model is described in further detail.
As shown in figure 1, a kind of photovoltaic shunt chopper of shared capacitor topology of this utility model, grid-connected including multichannel
Inversion unit, every road photovoltaic grid-connected inversion unit is connected respectively and is individually exchanged output LC filter unit, forms branch road, Duo Gezhi
The rear class of road parallel outputs is connected to a shared capacitor cell, and the outfan of shared capacitor cell is connected with electrical network.
In each branch parameters of guarantee unanimously, in the case of and eliminating circulation between each branch road using carrier wave high-frequency synchronous, different
The system equivalent circuit shown in Fig. 2 can be derived by by equivalent transformation between branch road.Therefrom can see, to each branch road,
Its wave filter is configured to LCCL, and because two electric capacity are parallel relationship, this wave filter reality is still LCL type structure.
Taking parameter each in Fig. 1 as a example, to LCL type wave filter, when its only one of which branch road runs, its resonance frequency expression
For：
When n branch road parallel running simultaneously, according to Fig. 2, system resonance frequencies expression formula now is changed into：
Want to ensure that LCL filter resonant frequency will not change with the change of branch circuit parallel connection quantity, be requirement：
It will be apparent that now will make：
If ensure that：
LcCf=LgCg(5)
It will be apparent that the resonant frequency of system will not change with the change of branch circuit parallel connection quantity.
Fig. 3 and Fig. 4 sets forth using direct parallel arrangement with the utility model proposes during scheme, with grid-connected circuitry number
The increase of amount, the change of system resonance frequencies.Therefrom can significantly see, the utility model proposes scheme can be fundamentally
Solve the problems, such as and machine number change leads to system resonance frequencies to change.
Because inverter side inductance Lc is generally much larger than net side equivalent inductance Lg, from formula (5), now inverter side electricity
Hold Cf and will be substantially less that net side electric capacity Cg.Because Cg is to share electric capacity, quantity in the entire system seldom, therefore adopts the program,
The capacitance of integral capacitor can greatly be cut down, and in the type needing to add passive damping unit, can be by damping unit
Being added to shared capacitance positions, thus reducing the quantity of necessary hardware, can see from the contrast of Fig. 5 and Fig. 6, former scheme needs
Add damping unit to the electric capacity of the LC wave filter of each parallel branch, and this utility model only needs to add in shared capacitance positions
Plus damping unit, so can effectively reduce system cost.
Claims (2)
1. a kind of photovoltaic shunt chopper of shared capacitor topology, including multichannel photovoltaic grid-connected inversion unit it is characterised in that：Often
Road photovoltaic grid-connected inversion unit is connected respectively and is individually exchanged output LC filter unit, forms branch road, multiple branch circuit parallel connections outputs
The rear class at end is connected to a shared capacitor cell, and the outfan of shared capacitor cell is connected with electrical network；Each branch road itself exports
LC filtering with parallel after the filter capacitor of shared capacitor cell and grid side equivalent inductance be monolithically fabricated LCCL type filter structure,
Electric capacity due to sharing capacitor cell is parallel relationship with each branch road filter capacitor, therefore is still LCL type filter structure on the whole；Institute
The product of inductance and electric capacity stating exchange output LC filter unit is equal to grid side inductance taking advantage of with the electric capacity of capacitor cell together
Long-pending, that is, the product of inverter side inductance and electric capacity is equal to the product of net side inductance and electric capacity, the resonant frequency of this LCL type filter structure
Will not change with the change of branch road number.
2. a kind of shared capacitor topology according to claim 1 photovoltaic shunt chopper it is characterised in that：Adding no
Source damps in the system of hardware unit, and described passive damping unit is added on shared capacitor cell position, that is, ensure that acquisition
Enough dampings and the quantity of the passive damping unit of reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620821789.1U CN205986183U (en) | 2016-08-01 | 2016-08-01 | Topological photovoltaic shunt chopper of sharing electric capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620821789.1U CN205986183U (en) | 2016-08-01 | 2016-08-01 | Topological photovoltaic shunt chopper of sharing electric capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205986183U true CN205986183U (en) | 2017-02-22 |
Family
ID=58028378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620821789.1U Withdrawn - After Issue CN205986183U (en) | 2016-08-01 | 2016-08-01 | Topological photovoltaic shunt chopper of sharing electric capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205986183U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253327A (en) * | 2016-08-01 | 2016-12-21 | 特变电工西安电气科技有限公司 | A kind of photovoltaic parallelly connected reverse converter system of shared capacitor topology |
| CN109286325A (en) * | 2018-11-14 | 2019-01-29 | 广东电网有限责任公司 | A kind of harmonic analysis method of electric power electric transformer multi-machine parallel connection |
-
2016
- 2016-08-01 CN CN201620821789.1U patent/CN205986183U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253327A (en) * | 2016-08-01 | 2016-12-21 | 特变电工西安电气科技有限公司 | A kind of photovoltaic parallelly connected reverse converter system of shared capacitor topology |
| CN106253327B (en) * | 2016-08-01 | 2018-11-06 | 特变电工西安电气科技有限公司 | A kind of photovoltaic parallelly connected reverse converter system of shared capacitor topology |
| CN109286325A (en) * | 2018-11-14 | 2019-01-29 | 广东电网有限责任公司 | A kind of harmonic analysis method of electric power electric transformer multi-machine parallel connection |
| CN109286325B (en) * | 2018-11-14 | 2020-08-14 | 广东电网有限责任公司 | Resonance analysis method for multi-machine parallel connection of power electronic transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101820230B (en) | High-frequency isolation type grid-connected inverter | |
| CN102122897B (en) | Solar photovoltaic three-phase micro inverter and solar photovoltaic power generation system | |
| WO2019075955A1 (en) | Coordination control method for input-parallel output-series direct current boost-based photovoltaic collection access system | |
| CN103516248B (en) | Based on the LLCL filtering combining inverter of single current loop control | |
| CN205986183U (en) | Topological photovoltaic shunt chopper of sharing electric capacity | |
| CN104578132A (en) | Electric power collector system for alternating-current and direct-current microgrid | |
| CN106253327B (en) | A kind of photovoltaic parallelly connected reverse converter system of shared capacitor topology | |
| CN107046297A (en) | DC series permanent magnetism wind power plant topological structure and its control method | |
| CN205583708U (en) | Be total to integrated power supply system of dc bus type distributing type photovoltaic energy storage battery | |
| CN203151392U (en) | High-efficiency low-leakage-current inverter topology | |
| CN204967747U (en) | Alternating voltage type photovoltaic cell converting circuit | |
| CN201985549U (en) | Multi-input and multi-level photovoltaic inverter | |
| CN108123447A (en) | A kind of quasi- ratio resonance of novel photovoltaic grid-connected inverter inhibits strategy | |
| CN203537259U (en) | Five-level single-phase photovoltaic grid-connected inverter | |
| CN203537261U (en) | Seven-level single-phase photovoltaic grid-connected inverter | |
| CN108199406A (en) | Microgrid control system based on distributed generation resource | |
| CN201946990U (en) | Schedulable three-phase photovoltaic grid-connected inverter based on inductor-capacitor-inductor (LCL) filter | |
| CN204559495U (en) | Photovoltaic generating system | |
| CN204144945U (en) | A kind of LCL+LC filter circuit for APF main circuit | |
| CN103633869A (en) | Seven-level single-phase photovoltaic grid-connected inverter | |
| CN206211549U (en) | A kind of collecting and distributing type photovoltaic power generation control system based on micro-capacitance sensor technology | |
| CN105406512A (en) | Common direct current bus type distributed photovoltaic energy storage integration power supply system and control method therefor | |
| CN207098618U (en) | VSC-based new energy access alternating current and direct current power grid system | |
| CN206060226U (en) | A kind of special individual event combining inverter of blower fan | |
| CN104716662A (en) | Light-storage system with reactive dynamic compensation function and compensation control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170222 Effective date of abandoning: 20181106 |
|
| AV01 | Patent right actively abandoned |