CN203787971U - Novel distributed photovoltaic grid-connected power generation system control device - Google Patents

Novel distributed photovoltaic grid-connected power generation system control device Download PDF

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Publication number
CN203787971U
CN203787971U CN201420222413.XU CN201420222413U CN203787971U CN 203787971 U CN203787971 U CN 203787971U CN 201420222413 U CN201420222413 U CN 201420222413U CN 203787971 U CN203787971 U CN 203787971U
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China
Prior art keywords
grid
circuit
control device
photovoltaic system
control circuit
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CN201420222413.XU
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Inventor
黄伟荣
韩炯锐
谢灿华
梁子健
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Meaningful Power Engineering Design Co Ltd Converges In Guangzhou
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Meaningful Power Engineering Design Co Ltd Converges In Guangzhou
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20Active power filtering [APF]

Abstract

Disclosed in the utility model is a novel distributed photovoltaic grid-connected power generation system control device comprising a grid-connected decoupling control circuit and a harmonic detection circuit. The grid-connected decoupling control circuit is connected with the harmonic detection circuit and is provided with a grid-connected side output terminal at a photovoltaic grid-connected power generation system; the harmonic detection circuit is connected with a load circuit and is used for detecting a load current and providing a given value of the current for the grid-connected decoupling control circuit. The grid-connected decoupling control circuit has a dual-closed loop circuit structure; one loop is connected with a stable output unit for controlling reactive currents and the other loop is connected with a stable output unit for controlling active currents. Therefore, the photovoltaic grid-connected power generation system can carry out grid-connected power generation, reactive compensation, and active filtering simultaneously; an objective of energy conservation is achieved; and the electric energy quality is substantially improved.

Description

A kind of new distribution type grid-connected photovoltaic system control device
Technical field
The utility model relates to parallel network power generation technology, especially a kind of new distribution type grid-connected photovoltaic system control device.
Background technology
Typical grid-connected photovoltaic system is mainly made up of photovoltaic cell, prime boost chopper, voltage source inverter and filter circuit, voltage source inverter is realized the adjusting to grid-connected power, this circuit structure is in the time that illumination is stronger, can realize and generating electricity by way of merging two or more grid systems smoothly, but not enough is, distributed photovoltaic grid-connected system is only providing active energy at present, and the reactive current of load may affect the power supply quality of electrical network tip; Otherwise, can only increase corresponding reactive-load compensation equipment.In addition, this system is subject to round the clock solar irradiation variable effect and has intermittent and unsettled feature, and intermittence and unsteadiness also will appear in its generated output.
Utility model content
In order to solve the problems of the technologies described above, a kind of new distribution type grid-connected photovoltaic system control device that the utility model provides, reactive power compensation and active power filtering function on grid-connected photovoltaic system main circuit structure, are expanded, system is in generating electricity by way of merging two or more grid systems, can improve the electrical network quality of power supply, there is good economic benefit.
To achieve these goals, the technical scheme that the utility model adopts is:
A kind of new distribution type grid-connected photovoltaic system control device, comprise grid-connected decoupling zero control circuit and harmonics detection circuit, described grid-connected decoupling zero control circuit is connected with harmonics detection circuit and the grid-connected side output that is positioned at grid-connected photovoltaic system is set, described harmonics detection circuit connects load circuit provides the set-point of electric current for detection of load current for grid-connected decoupling zero control circuit, described grid-connected decoupling zero control circuit is double-loop circuit structure, one ring connects the stable output of controlling reactive current, and another ring connects the stable output of controlling active current.
As the improvement of technique scheme, in described harmonics detection circuit, be provided with the low pass filter with active power filtering effect.
As the further improvement of technique scheme, in described control device, be provided with pattern commutation circuit and connect the power output that detects photovoltaic cell in grid-connected photovoltaic system, and then the mode of operation of switched voltage type inverter is controlled in output.
As the further improvement of technique scheme, described control device also includes for the surge protector of lightning protection and is connected with grid-connected photovoltaic system.
The beneficial effects of the utility model: grid-connected decoupling zero control circuit adopts double-loop circuit structure, can overcome the system disturbance being caused by voltage ripple of power network, make active current and reactive current obtain respectively independent control, realize meritorious output and reactive power compensation to electrical network, reach the object of decoupling zero control, and harmonics detection circuit draws the given value of current value of harmonic current components as grid-connected decoupling zero control circuit by detecting load current, played the effect of electrical network active power filtering simultaneously, system can be generated electricity by way of merging two or more grid systems simultaneously, reactive power compensation and active power filtering, reach energy-conservation object, improve greatly the quality of power supply, there is good economic benefit.
Brief description of the drawings
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
Fig. 1 is the syndeton schematic diagram of grid-connected photovoltaic system;
Fig. 2 is the electrical block diagram of grid-connected decoupling zero control circuit in the utility model;
Fig. 3 is the electrical block diagram of harmonics detection circuit in the utility model.
Embodiment
With reference to Fig. 1, a kind of new distribution type grid-connected photovoltaic system control device of the present utility model, it is the function that combines reactive power compensation and active power filtering on the circuit structure of grid-connected photovoltaic system, the main circuit structure of grid-connected photovoltaic system includes the photovoltaic cell 3 connecting successively, prime boost chopper 4, voltage source inverter 5 and filter circuit 6, control device of the present utility model comprises grid-connected decoupling zero control circuit 1 and harmonics detection circuit 2, grid-connected decoupling zero control circuit 1 is connected with harmonics detection circuit 2 and the grid-connected side output that is positioned at grid-connected photovoltaic system is set, make the circuit structure of grid-connected photovoltaic system there is reactive power compensation and active power filtering function.
With reference to Fig. 2 and Fig. 3, in foregoing circuit structure, grid-connected decoupling zero control circuit 1 adopts double-loop circuit structure, wherein a ring connects the stable output of controlling reactive current, and another ring connects the stable output of controlling active current, can overcome the system disturbance being caused by voltage ripple of power network, in double circle structure, by independently controlling the size and Orientation of active current and reactive current, realize meritorious output and reactive power compensation to electrical network, reach the object of decoupling zero control.And harmonics detection circuit 2 connects load circuit, in harmonics detection circuit 2, be provided with the low pass filter with active power filtering effect, can send quickly and accurately and the harmonic current of load current equal and opposite in direction, opposite direction by detecting load current, the harmonic current components drawing, as the given value of current value of grid-connected decoupling zero control circuit 1, has played the effect of active power filtering simultaneously.
In control device of the present utility model, also include pattern commutation circuit and surge protector; pattern commutation circuit connects the power output that detects photovoltaic cell 3 in grid-connected photovoltaic system; and then the mode of operation of switched voltage type inverter 5 is controlled in output; two kinds of mode of operations comprise the pattern of generating electricity by way of merging two or more grid systems and APF pattern, have taken into account the advantage of distributed power generation and active power filter.Described surge protector is connected with grid-connected photovoltaic system, suffers that for the protection of system thunder and lightning destroys.
Prime boost chopper 4 in grid-connected photovoltaic system completes to be followed the tracks of photovoltaic cell 3 Maximum Power Output points, for the stable operation of system provides basis, export adjusting in conjunction with grid-connected decoupling zero control circuit 1 and harmonics detection circuit 2, system can be generated electricity by way of merging two or more grid systems simultaneously, reactive power compensation and active power filtering, reach energy-conservation object, also improve greatly the quality of power supply, there is good economic benefit.
The above, be preferred embodiment of the present utility model, and the utility model is not limited to the structure of above-mentioned execution mode, as long as it reaches technique effect of the present utility model with identical means, all should belong to protection range of the present utility model.

Claims (4)

1. a new distribution type grid-connected photovoltaic system control device, it is characterized in that: comprise grid-connected decoupling zero control circuit and harmonics detection circuit, described grid-connected decoupling zero control circuit is connected with harmonics detection circuit and the grid-connected side output that is positioned at grid-connected photovoltaic system is set, described harmonics detection circuit connects load circuit provides the set-point of electric current for detection of load current for grid-connected decoupling zero control circuit, described grid-connected decoupling zero control circuit is double-loop circuit structure, one ring connects the stable output of controlling reactive current, another ring connects the stable output of controlling active current.
2. a kind of new distribution type grid-connected photovoltaic system control device according to claim 1, is characterized in that: in described harmonics detection circuit, be provided with the low pass filter with active power filtering effect.
3. a kind of new distribution type grid-connected photovoltaic system control device according to claim 2, is characterized in that: in described control device, be provided with pattern commutation circuit and connect the power output that detects photovoltaic cell in grid-connected photovoltaic system.
4. according to the arbitrary described a kind of new distribution type grid-connected photovoltaic system control device of claims 1 to 3, it is characterized in that: described control device also includes for the surge protector of lightning protection and is connected with grid-connected photovoltaic system.
CN201420222413.XU 2014-04-30 2014-04-30 Novel distributed photovoltaic grid-connected power generation system control device Active CN203787971U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420222413.XU CN203787971U (en) 2014-04-30 2014-04-30 Novel distributed photovoltaic grid-connected power generation system control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420222413.XU CN203787971U (en) 2014-04-30 2014-04-30 Novel distributed photovoltaic grid-connected power generation system control device

Publications (1)

Publication Number Publication Date
CN203787971U true CN203787971U (en) 2014-08-20

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CN201420222413.XU Active CN203787971U (en) 2014-04-30 2014-04-30 Novel distributed photovoltaic grid-connected power generation system control device

Country Status (1)

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CN (1) CN203787971U (en)

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