CN209709696U - A kind of photovoltaic DC-to-AC converter topological structure based on electric power electric transformer - Google Patents
A kind of photovoltaic DC-to-AC converter topological structure based on electric power electric transformer Download PDFInfo
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- CN209709696U CN209709696U CN201920526682.8U CN201920526682U CN209709696U CN 209709696 U CN209709696 U CN 209709696U CN 201920526682 U CN201920526682 U CN 201920526682U CN 209709696 U CN209709696 U CN 209709696U
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Abstract
The utility model discloses a kind of photovoltaic DC-to-AC converter topological structure based on electric power electric transformer, it is related to photovoltaic DC-to-AC converter technical field, including front end boost circuit, by three stem high frequency transformers, DC energy storage capacitor, the middle-end isolation level that three full control H bridge type circuits form and the rear end inverse cascade being made of three-phase thyristor bridge inverter circuit and LCL low-pass filter；Front end boost circuit is connect by control H bridge type circuit entirely with three stem high frequency transformers, three stem high frequency transformers are connect by being parallel with the full control H bridge type circuit of DC energy storage capacitor with three-phase thyristor bridge inverter circuit, three-phase thyristor bridge inverter circuit is connected by LCL low-pass filter and power grid or load, to realize joint power supply, extend the loaded work piece time, mentions high control precision.
Description
Technical field
The utility model relates to photovoltaic DC-to-AC converter technical fields, more particularly to a kind of light based on electric power electric transformer
Lie prostrate inverter topology.
Background technique
Since the intensity of illumination of daily sunlight is different, the output power of photovoltaic array is caused also to change therewith.Due to existing
Photovoltaic DC-to-AC converter be individually to be powered by photovoltaic array mostly, therefore, the normal working hours of load is by the defeated of photovoltaic array
It influences out very big.The research in existing photovoltaic DC-to-AC converter topological structure field is more, has their own characteristics each, but due to the structure of itself spy
Point cannot achieve joint power supply, i.e., can not combine the other equipment in addition to power grid is load supplying.Such situation is unfavorable for prolonging
The normal working hours of long load.
Centralized inverter is mainly used in large-power occasions, but has the disadvantage in that expansion and redundant ability are poor, series connection
Blocking diode increases system loss, and there are high voltage direct current cables between the side PV and inverter, and loss is big, and net side uses
The thyristor of power frequency modulation, introduces harmonic current, influences power quality.Though above-mentioned certain of Miniature inverter effective solution
Problem, but Miniature inverter is suitable for small-power occasion.
Utility model content
The purpose of the utility model is to provide a kind of photovoltaic DC-to-AC converter topological structure based on electric power electric transformer, can answer
The control precision of total system, the use of three stem high frequency transformers can be improved in use for large-power occasions, and fully controlled bridge
To realize that the combination of photovoltaic and energy storage provides hardware foundation, it is advantageously implemented to combine and powers, extend the normal working hours of load,
Improve the economy of photovoltaic system.
To achieve the above object, the utility model provides following scheme:
A kind of photovoltaic DC-to-AC converter topological structure based on electric power electric transformer, including the isolation of front end boost circuit, middle-end
Grade and rear end inverse cascade；
The middle-end isolation level includes three stem high frequency transformers, DC energy storage capacitor and three full control H bridge type circuits；Institute
Stating rear end inverse cascade includes three-phase thyristor bridge inverter circuit and LCL low-pass filter；Three full control H bridge type circuit difference
H bridge type circuit is controlled entirely for the first full control H bridge type circuit, the second full control H bridge type circuit, third；
The direct current that sunlight obtains after conversion enters the photovoltaic DC-to-AC converter by the front end boost circuit and opens up
Flutter structure；The output end of the front end boost circuit is connect with the input terminal of the described first full control H bridge type circuit, and described first
The output end of full control H bridge type circuit is connect with the first stem of the three stems high frequency transformer, the three stems high frequency transformation
Second stem of device is connect with the input terminal of the described second full control H bridge type circuit, the third core of the three stems high frequency transformer
Column is connect with the input terminal that the third controls H bridge type circuit entirely, the output end and the three-phase of the described second full control H bridge type circuit
The input terminal of full-controlled bridge inverter circuit connects, the output end of the three-phase thyristor bridge inverter circuit and the LCL low pass filtered
The input terminal of wave device connects, and the output end and power grid of the LCL low-pass filter or load connect；Wherein, described second
The outlet side of full control H bridge type circuit is parallel with the DC energy storage capacitor.
Optionally, the input terminal of the front end boost circuit is connect with the extraneous photovoltaic array for photoelectric conversion；Its
In, sunlight is converted into direct current after the photovoltaic array.
Optionally, DC voltage-stabilizing capacitor is equipped between the photovoltaic array and the front end boost circuit, and described straight
Stream electric capacity of voltage regulation is connected in parallel on the outlet side of the photovoltaic array, is the direct current of the front end boost circuit with stable.
Optionally, the photovoltaic DC-to-AC converter topological structure further includes the output end company for controlling H bridge type circuit entirely with the third
The battery connect；The battery is for storing extra electric energy.
Optionally, three full control H bridge type circuits are made of four high voltage switch devices, to realize electric energy
Conversion function.
Optionally, the three stems high frequency transformer is electric power electric transformer, to realize that the multidirectional flowing of energy provides
Hardware foundation.
Optionally, the three-phase thyristor bridge inverter circuit is made of six high pressures or low-pressure high-power switching device.
Optionally, the described first full control H bridge type circuit is full control inversion H bridge type circuit, the described second full control H bridge type circuit
Controlling H bridge type circuit entirely with the third is full-controlled rectifier H bridge type circuit.
Optionally, be wrapped in first stem, second stem, coil on the third stem turn ratio be
1:M:N.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects:
1, the photovoltaic DC-to-AC converter topological structure that the utility model is proposed be it is ambipolar, by MPPT maximum power point tracking function with
The separation of electric energy conversion function, reduces control difficulty.
2, the photovoltaic DC-to-AC converter topological structure that the utility model is proposed uses full-controlled bridge knot in isolation level and inverse cascade
Structure is made of IGBT power module, is suitable for high-power environment；Due to being fully controlled bridge, control precision is higher.
3, the photovoltaic DC-to-AC converter topological structure that the utility model is proposed not only increases the diversity of topological structure function,
It can also be achieved joint power supply, extend the normal working hours of load, form microgrid, further improve the spirit of Operation of Electric Systems
Activity, controllability and economy.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without any creative labor, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is photovoltaic DC-to-AC converter topological structure block diagram of the utility model embodiment based on electric power electric transformer；
Fig. 2 is photovoltaic DC-to-AC converter topological structure schematic diagram of the utility model embodiment based on electric power electric transformer.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
Embodiment 1
Fig. 1 is photovoltaic DC-to-AC converter topological structure block diagram of the utility model embodiment based on electric power electric transformer, such as Fig. 1
Shown, the present embodiment proposes a kind of photovoltaic DC-to-AC converter topological structure based on electric power electric transformer, it is accurate for be isolated form
The ambipolar photovoltaic combining inverter of three-phase, this topological structure is other than it can be achieved normal photovoltaic generation power transfer function, also
The multidirectional flowing of energy can be achieved, and then realize that photovoltaic is combined with energy storage.
This topological structure is made of front end boost circuit, middle-end isolation level and rear end inverse cascade.Front end boost circuit master
Realize MPPT maximum power point tracking (MPPT) function；Middle-end isolation level is by three full control H bridge type circuits, three stem high frequency transformers
It is formed with DC energy storage capacitor；Rear end inverse cascade is made of three-phase thyristor bridge inverter circuit and LCL low-pass filter.Wherein,
Three full control H bridge type circuits are respectively that the first full H bridge type circuit, the second full control H bridge type circuit, third controlled controls H bridge type circuit entirely.
The direct current that sunlight obtains after conversion enters photovoltaic DC-to-AC converter topological structure by front end boost circuit；
The output end of front end boost circuit is connect with the input terminal of the first full control H bridge type circuit, the output of the first full control H bridge type circuit
End is connect with the first stem of three stem high frequency transformers, the second stem of three stem high frequency transformers and the second full control H bridge type
The input terminal of circuit connects, and the input terminal that the third stem of three stem high frequency transformers controls H bridge type circuit with third entirely is connect, the
The output end of two full control H bridge type circuits is connect with the input terminal of three-phase thyristor bridge inverter circuit, three-phase thyristor bridge inversion electricity
The output end on road is connect with the input terminal of LCL low-pass filter, and the output end and power grid of LCL low-pass filter or load connect
It connects；Wherein, DC energy storage capacitor is parallel in the outlet side of the second full control H bridge type circuit；First full control H bridge type circuit is full control
It is full-controlled rectifier H bridge type circuit that inversion H bridge type circuit, the second full control H bridge type circuit and third control H bridge type circuit entirely.
In the topological structure that the present embodiment is proposed, front end boost circuit is for realizing MPPT function, front end boost
DC energy storage capacitor in circuit has the function of that burning voltage, the full control H bridge type circuit of the first of middle-end isolation level are (specially complete
Control inversion H-bridge circuit) realize that electric energy is converted and the function of energy transmission, the two cooperate, reduce control difficulty.
In the topological structure that the present embodiment is proposed, the full control H bridge type circuit of three of middle-end isolation level is all by four height
It presses high-power switch device to constitute, such as IGBT power module, realizes electric energy conversion function, three intermediate stem high frequency transformers
It is electric power electric transformer, to realize that the multidirectional flowing of energy provides hardware foundation.
In the topological structure that the present embodiment is proposed, the three-phase thyristor bridge inverter circuit of rear end inverse cascade is by 6
High pressure or low-pressure high-power component composition, such as IGBT power module, are three-phase inverting circuits, export three-phase alternating current, LCL
Low-pass filter can filter out the clutter in three-phase alternating current, finally, by rear end inverse cascade output frequency and the adjustable three-phase of voltage
Alternating current drives load running.
The photovoltaic DC-to-AC converter topological structure that the present embodiment is proposed, main feature, which is to provide, realizes photovoltaic and energy storage knot
The hardware foundation of conjunction, it is final to realize joint power supply, extend the normal working hours of load.
Embodiment 2
Fig. 2 is photovoltaic DC-to-AC converter topological structure schematic diagram of the utility model embodiment based on electric power electric transformer, such as
Shown in Fig. 2, the input terminal and photovoltaic battle array of the photovoltaic DC-to-AC converter topological structure provided in this embodiment based on electric power electric transformer
Column connection, output end and power grid or load connect；The photovoltaic DC-to-AC converter topological structure include front end boost circuit, middle-end every
From grade and rear end inverse cascade.Wherein, sunlight is converted into direct current after photovoltaic array.
Middle-end isolation level includes three stem high frequency transformers, DC energy storage capacitor and three full control H bridge type circuits；Inverse cascade
Including three-phase thyristor bridge inverter circuit and LCL low-pass filter；Three full control H bridge type circuits are respectively the first full control H bridge type
Circuit, the second full control H bridge type circuit, third control H bridge type circuit entirely.
Input terminal positioned at extraneous and the photovoltaic array for photoelectric conversion output end and front end boost circuit connects
It connects, so that direct current be made to enter photovoltaic DC-to-AC converter topological structure by front end boost circuit.In addition, in photovoltaic array and front end
It is equipped with DC voltage-stabilizing capacitor C1 between boost circuit, and DC voltage-stabilizing capacitor C1 is connected in parallel on the outlet side of photovoltaic array, is front end
The direct current of boost circuit with stable.
The output end of front end boost circuit is connect with the input terminal of the first full control H bridge type circuit, the first full control H bridge type electricity
The output end on road is connect with the first stem of three stem high frequency transformers, and the second stem of three stem high frequency transformers and second is entirely
The input terminal connection of H bridge type circuit is controlled, the third stem and third of three stem high frequency transformers control the input terminal of H bridge type circuit entirely
The output end of connection, the second full control H bridge type circuit is connect with the input terminal of three-phase thyristor bridge inverter circuit, three-phase thyristor bridge
The output end of inverter circuit is connect with the input terminal of LCL low-pass filter, the output end and power grid of LCL low-pass filter or negative
Carry connection；Wherein, DC energy storage capacitor C2 is parallel in the outlet side of the second full control H bridge type circuit；First full control H bridge type circuit
To control inversion H bridge type circuit entirely, it is full-controlled rectifier H bridge type electricity that the second full control H bridge type circuit and third control H bridge type circuit entirely
Road.
Photovoltaic DC-to-AC converter topological structure further includes the battery controlling the output end of H bridge type circuit entirely with third and connecting；The storage
Battery is for storing extra electric energy.
Wherein, three full control H bridge type circuits are made of four high voltage switch devices, to realize that electric energy converts function
Energy.Three stem high frequency transformers are electric power electric transformer, to realize that the multidirectional flowing of energy provides hardware foundation.Three-phase fully-controlled
Bridge inverter main circuit is made of six high pressures or low-pressure high-power switching device.Preferential, above-mentioned device for power switching is equal
For IGBT power module.
It is preferential, be wrapped in the first stem, the second stem, coil on third stem turn ratio be 1:M:N.
The control precision of total system, three stems can be improved by the use of fully controlled bridge for topological structure provided in this embodiment
The use of high frequency transformer is advantageously implemented joint power supply, extends negative to realize that the combination of photovoltaic and energy storage provides hardware foundation
The normal working hours of load improves the economy of photovoltaic system, can be applied to large-power occasions.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Explanation be merely used to help understand the method and its core concept of the utility model；Meanwhile for the general technology of this field
Personnel, based on the idea of the present invention, there will be changes in the specific implementation manner and application range.In conclusion
The content of the present specification should not be construed as a limitation of the present invention.
Claims (9)
1. a kind of photovoltaic DC-to-AC converter topological structure based on electric power electric transformer, which is characterized in that the photovoltaic DC-to-AC converter is opened up
Flutterring structure includes front end boost circuit, middle-end isolation level and rear end inverse cascade；
The middle-end isolation level includes three stem high frequency transformers, DC energy storage capacitor and three full control H bridge type circuits；After described
Holding inverse cascade includes three-phase thyristor bridge inverter circuit and LCL low-pass filter；Three full control H bridge type circuits are respectively
One full control H bridge type circuit, the second full control H bridge type circuit, third control H bridge type circuit entirely；
The direct current that sunlight obtains after conversion enters the photovoltaic DC-to-AC converter topology knot by the front end boost circuit
Structure；The output end of the front end boost circuit is connect with the input terminal of the described first full control H bridge type circuit, the described first full control H
The output end of bridge circuit is connect with the first stem of the three stems high frequency transformer, and the of the three stems high frequency transformer
Two stems are connect with the input terminal of the described second full control H bridge type circuit, the third stem of the three stems high frequency transformer and institute
State the input terminal connection that third controls H bridge type circuit entirely, the output end and the three-phase full-controlled bridge of the described second full control H bridge type circuit
The input terminal of formula inverter circuit connects, the output end of the three-phase thyristor bridge inverter circuit and the LCL low-pass filter
Input terminal connection, the output end and power grid of the LCL low-pass filter or load connect；Wherein, in the described second full control H bridge
The outlet side of formula circuit is parallel with the DC energy storage capacitor.
2. the photovoltaic DC-to-AC converter topological structure according to claim 1 based on electric power electric transformer, which is characterized in that institute
The input terminal for stating front end boost circuit is connect with the extraneous photovoltaic array for photoelectric conversion；Wherein, sunlight passes through the light
Direct current is converted into after photovoltaic array.
3. the photovoltaic DC-to-AC converter topological structure according to claim 2 based on electric power electric transformer, which is characterized in that In
DC voltage-stabilizing capacitor is equipped between the photovoltaic array and the front end boost circuit, and the DC voltage-stabilizing capacitor is connected in parallel on
The outlet side of the photovoltaic array is the direct current of the front end boost circuit with stable.
4. the photovoltaic DC-to-AC converter topological structure according to claim 1 based on electric power electric transformer, which is characterized in that institute
State the battery that photovoltaic DC-to-AC converter topological structure further includes to be connect with the output end that the third controls H bridge type circuit entirely；The storage
Battery is for storing extra electric energy.
5. the photovoltaic DC-to-AC converter topological structure according to claim 1 based on electric power electric transformer, which is characterized in that three
A full control H bridge type circuit is made of four high voltage switch devices, to realize electric energy conversion function.
6. the photovoltaic DC-to-AC converter topological structure according to claim 1 based on electric power electric transformer, which is characterized in that institute
Stating three stem high frequency transformers is electric power electric transformer, to realize that the multidirectional flowing of energy provides hardware foundation.
7. the photovoltaic DC-to-AC converter topological structure according to claim 1 based on electric power electric transformer, which is characterized in that institute
Three-phase thyristor bridge inverter circuit is stated to be made of six high pressures or low-pressure high-power switching device.
8. the photovoltaic DC-to-AC converter topological structure according to claim 1 based on electric power electric transformer, which is characterized in that institute
Stating the first full control H bridge type circuit is full control inversion H bridge type circuit, and the described second full control H bridge type circuit and the third control H bridge entirely
Formula circuit is full-controlled rectifier H bridge type circuit.
9. the photovoltaic DC-to-AC converter topological structure according to claim 1 based on electric power electric transformer, which is characterized in that twine
Be wound on first stem, second stem, coil on the third stem turn ratio be 1:M:N.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109888836A (en) * | 2019-04-18 | 2019-06-14 | 河北工程大学 | A kind of photovoltaic DC-to-AC converter topological structure based on electric power electric transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888836A (en) * | 2019-04-18 | 2019-06-14 | 河北工程大学 | A kind of photovoltaic DC-to-AC converter topological structure based on electric power electric transformer |
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