CN111668872A - Photovoltaic grid-connected device suitable for alternating current-direct current hybrid power distribution network - Google Patents
Photovoltaic grid-connected device suitable for alternating current-direct current hybrid power distribution network Download PDFInfo
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- CN111668872A CN111668872A CN202010565590.8A CN202010565590A CN111668872A CN 111668872 A CN111668872 A CN 111668872A CN 202010565590 A CN202010565590 A CN 202010565590A CN 111668872 A CN111668872 A CN 111668872A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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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
Abstract
The embodiment of the invention discloses a photovoltaic grid-connected device suitable for an alternating current-direct current hybrid power distribution network, which comprises the following components: the photovoltaic power generation system comprises a photovoltaic power generation system, a first inverter circuit, a transformer, a rectifying and filtering circuit, a second inverter circuit, a direct current power grid, an alternating current power grid, a change-over switch, a control module and a voltage detection module; the control module is used for controlling the on-off of the change-over switch and the direct current power grid or the second inverter circuit, and controlling the first inverter circuit to control the output voltage of the direct current power grid to follow the output voltage of the rectification filter circuit when controlling the on-off of the change-over switch and the direct current power grid, or controlling the second inverter circuit to control the output voltage of the alternating current power grid to follow the output voltage of the second inverter circuit when controlling the on-off of the change-over switch and the second inverter circuit. Therefore, the electric energy generated by the photovoltaic power generation system can be more efficiently consumed on the spot according to the demands of users, and different power utilization demands of the users are met.
Description
Technical Field
The embodiment of the invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic grid-connected device suitable for an alternating current-direct current hybrid power distribution network.
Background
Distributed energy such as photovoltaic power generation has become the development trend of future energy systems at present, and more users install photovoltaic power generation systems. The photovoltaic grid-connected device can transmit the generated energy of the photovoltaic power generation system to the power grid for consumption. However, the existing photovoltaic grid-connected device usually only considers ac grid-connection, that is, photovoltaic power generation is transmitted to an ac power grid, and a dc power grid is ignored, so that the application range is small, and different power consumption requirements of users cannot be met.
Disclosure of Invention
The invention provides a photovoltaic grid-connected device suitable for an alternating current-direct current hybrid power distribution network, which is used for outputting voltage output by a photovoltaic power generation system to a direct current power grid or an alternating current power grid according to user requirements, and realizing that the voltage of the direct current power grid can follow the output voltage of a rectifying filter circuit and the voltage of the alternating current power grid can follow the output voltage of a second inverter circuit.
The embodiment of the invention provides a photovoltaic grid-connected device suitable for an alternating current-direct current hybrid power distribution network, which comprises the following components: the photovoltaic power generation system comprises a photovoltaic power generation system, a first inverter circuit, a transformer, a rectifying and filtering circuit, a second inverter circuit, a direct current power grid, an alternating current power grid, a change-over switch, a control module and a voltage detection module;
the photovoltaic power generation system is electrically connected with the first inverter circuit, the first inverter circuit is electrically connected with the transformer and the control module respectively, the transformer is electrically connected with the rectification filter circuit, the rectification filter circuit is electrically connected with the change-over switch, the change-over switch is electrically connected with the direct current power grid, the second inverter circuit and the control module respectively, the second inverter circuit is electrically connected with the alternating current power grid and the control module respectively, and the voltage detection module is electrically connected with the rectification filter circuit, the second inverter circuit, the direct current power grid, the alternating current power grid and the control module respectively;
the control module is used for controlling the on/off of the change-over switch and the direct current power grid or the second inverter circuit, and controlling the first inverter circuit to control the output voltage of the direct current power grid to follow the output voltage of the rectification filter circuit when controlling the on of the change-over switch and the direct current power grid, or controlling the second inverter circuit to control the output voltage of the alternating current power grid to follow the output voltage of the second inverter circuit when controlling the on of the change-over switch and the second inverter circuit.
The invention provides a photovoltaic grid-connected device suitable for an alternating current-direct current hybrid power distribution network, which comprises the following components: the photovoltaic power generation system comprises a photovoltaic power generation system, a first inverter circuit, a transformer, a rectifying and filtering circuit, a second inverter circuit, a direct current power grid, an alternating current power grid, a change-over switch, a control module and a voltage detection module; the control module is used for controlling the on/off of the change-over switch and the direct current power grid or the second inverter circuit, and controlling the first inverter circuit to control the output voltage of the direct current power grid to follow the output voltage of the rectification filter circuit when the change-over switch is controlled to be on with the direct current power grid, or controlling the second inverter circuit to control the output voltage of the alternating current power grid to follow the output voltage of the second inverter circuit when the change-over switch is controlled to be on with the second inverter circuit. Therefore, the voltage output by the photovoltaic power generation system can be output to a direct current power grid or an alternating current power grid according to the user requirement, the voltage of the direct current power grid can follow the output voltage of the rectifying and filtering circuit, and the voltage of the alternating current power grid can follow the output voltage of the second inverter circuit.
Drawings
Fig. 1 is a block diagram of a photovoltaic grid-connected device suitable for an ac/dc hybrid power distribution network according to a first embodiment of the present invention;
fig. 2 is a block diagram of a photovoltaic grid-connected device suitable for an ac/dc hybrid power distribution network according to a second embodiment of the present invention;
fig. 3 is a block diagram of a photovoltaic grid-connected device suitable for an ac/dc hybrid power distribution network in a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a block diagram of a structure of a photovoltaic grid-connected device suitable for an ac/dc hybrid power distribution network in an embodiment of the present invention, and referring to fig. 1, the photovoltaic grid-connected device suitable for an ac/dc hybrid power distribution network includes: the photovoltaic power generation system comprises a photovoltaic power generation system 10, a first inverter circuit 100, a transformer 200, a rectifying and filtering circuit 300, a second inverter circuit 500, a direct current power grid 20, an alternating current power grid 30, a change-over switch 400, a control module 600 and a voltage detection module 700;
the photovoltaic power generation system 10 is electrically connected with the first inverter circuit 100, the first inverter circuit 100 is respectively electrically connected with the transformer 200 and the control module 600, the transformer 200 is electrically connected with the rectifying and filtering circuit 300, the rectifying and filtering circuit 300 is connected with the change-over switch 400, the change-over switch 400 is respectively electrically connected with the direct current power grid 20, the second inverter circuit 500 and the control module 600, the second inverter circuit 500 is respectively electrically connected with the alternating current power grid 30 and the control module 600, and the voltage detection module 700 is respectively electrically connected with the rectifying and filtering circuit 300, the second inverter circuit 500, the direct current power grid 20, the alternating current power grid 30 and the control module 600;
the control module 300 is configured to control the on/off of the switch 400 and the dc power grid 20 or the second inverter circuit 500, and when the switch 400 is controlled to be on with the dc power grid 20, the first inverter circuit 100 is controlled to control the output voltage of the dc power grid 20 to follow the output voltage of the rectifying and filtering circuit 300, or when the switch 400 is controlled to be on with the second inverter circuit 500, the second inverter circuit 500 is controlled to control the output voltage of the ac power grid 30 to follow the output voltage of the second inverter circuit 500.
The switch 400 may be a double-pole double-throw switch, a relay switch, or the like. The control module 600 may be a single chip, a PLC controller, etc. The user can select the dc power grid or the ac power grid by controlling the switch 400 through the control module 600 according to actual requirements. For example, when the demand of the user on the direct current load is greater, the electric energy output by the photovoltaic power generation system can be selectively output to the direct current power grid through the change-over switch, and when the demand of the user on the alternating current load is greater, the electric energy output by the photovoltaic power generation system can be output to the alternating current power grid through the change-over switch. Therefore, the electric energy generated by the photovoltaic power generation system can be more efficiently consumed on the spot according to the demands of users, and different power consumption demands of the users are met, so that the problem that the photovoltaic power generation surplus is wasted or the surplus consumption efficiency is low due to the fact that the photovoltaic power generation grid-connected mode is too single and cannot be adapted to the power consumption demands of the users in time can be solved.
In the technical scheme of this embodiment, this photovoltaic grid-connected device suitable for alternating current-direct current hybrid power distribution network's implementation process does: referring to fig. 1, a user may select a dc grid or an ac grid by controlling the switch 400 through the control module 600 according to actual requirements. For example, when a user has a greater demand for the dc load, the control module 600 controls the switching circuit 400 to connect the rectifying and filtering circuit 300 to the dc power grid 20, and disconnect the rectifying and filtering circuit 300 from the second inverter circuit 500, the voltage detection module 700 detects the output voltage of the rectifying and filtering circuit 300 and the output voltage of the dc power grid 20 in real time and sends the detected voltages to the control module 600, the control module 600 analyzes the received voltages, and when the output voltage of the dc power grid 20 is not consistent with the output voltage of the rectifying and filtering circuit 300, the control module 600 adjusts the first inverter circuit 100, so that the output voltage of the dc power grid 20 can follow the output voltage of the rectifying and filtering circuit 300, and the demand of the user for the dc power is met.
When the user has a greater demand for the ac load, the control module 600 controls the switching circuit 400 to connect the rectifying and filtering circuit 300 to the second inverter circuit 500, so that the rectifying and filtering circuit 300 is disconnected from the dc power grid 20, and the second inverter circuit 500 is connected to output the voltage output by the rectifying and filtering circuit 300 to the ac power grid 30. The voltage detection module 700 detects the output voltage of the second inverter circuit 500 and the output voltage of the ac power grid 30 in real time, and sends the detected voltage to the control module 600, the control module 600 analyzes the received voltage, when the output voltage of the ac power grid 30 is inconsistent with the output voltage of the second inverter circuit 500, the control module 600 adjusts the second inverter circuit 500, and also can adjust the first inverter circuit 100 in combination, so that the output voltage of the ac power grid 30 can follow the output voltage of the second inverter circuit 500, and the requirement of a user on the ac power is met. From this, the user can be according to the power consumption demand of reality, selects direct current electric wire netting or alternating current electric wire netting through change over switch, can more high-efficiently consume the electric energy that photovoltaic power generation system sent on the spot, satisfies different power consumption demands to can avoid photovoltaic power generation grid-connected mode too single, can not in time adapt to user power consumption demand and cause the waste of photovoltaic generated energy surplus or the problem that surplus consumption efficiency is low. And the output voltage of the direct current power grid can follow the output voltage of the rectification filter circuit, and the output voltage of the alternating current power grid can follow the output voltage of the second inverter circuit.
The technical scheme of this embodiment through providing a photovoltaic device that is connected to the power networks that is applicable to alternating current-direct current hybrid power distribution network, this photovoltaic device that is connected to the power networks that is applicable to alternating current-direct current hybrid power distribution network includes: the photovoltaic power generation system comprises a photovoltaic power generation system, a first inverter circuit, a transformer, a rectifying and filtering circuit, a second inverter circuit, a direct current power grid, an alternating current power grid, a change-over switch, a control module and a voltage detection module; the control module is used for controlling the on/off of the change-over switch and the direct current power grid or the second inverter circuit, and controlling the first inverter circuit to control the output voltage of the direct current power grid to follow the output voltage of the rectification filter circuit when the change-over switch is controlled to be on with the direct current power grid, or controlling the second inverter circuit to control the output voltage of the alternating current power grid to follow the output voltage of the second inverter circuit when the change-over switch is controlled to be on with the second inverter circuit. Therefore, the voltage output by the photovoltaic power generation system can be output to a direct current power grid or an alternating current power grid according to the user requirement, the voltage of the direct current power grid can follow the output voltage of the rectifying and filtering circuit, and the voltage of the alternating current power grid can follow the output voltage of the second inverter circuit.
Example two
Fig. 2 is a block diagram of a photovoltaic grid-connected device suitable for an ac/dc hybrid power distribution network in a second embodiment of the present invention, and referring to fig. 2, a switch 400 includes a first switch S1, a second switch S2, a first contact k1, a second contact k2, a third contact k3, and a fourth contact k4, where the first contact k1 is electrically connected to a first input terminal of a second inverter circuit 500, the second contact k2 is electrically connected to a first input terminal of a dc power grid 20, the third contact k3 is electrically connected to a second input terminal of the second inverter circuit 500, and the fourth contact k4 is electrically connected to a second input terminal of the dc power grid 20;
the control module 600 controls the switch 400 to be connected to the dc power grid 20 includes: the control module 600 controls the first switch S1 to be connected with the second contact k2, and the second switch S2 to be connected with the fourth contact k 4;
the control module 600 controls the switch 400 to be connected to the second inverter circuit 500, including: the control module 600 controls the first switch S1 to be connected to the first contact k1, and the second switch S2 to be connected to the third contact k 3.
When the control module 600 controls the first switch S1 to be connected with the second contact k2, and the second switch S2 to be connected with the fourth contact k4, the switch 400 is connected with the dc power grid 20, and the switch 400 is disconnected from the second inverter circuit 500, so that the electric energy generated by the photovoltaic power generation system 10 is output to the dc power grid 20. When the control module 600 controls the first switch S1 to be connected to the first contact k1, and the second switch S2 to be connected to the third contact k3, the switch 400 is connected to the second inverter circuit 500, and the switch 400 is disconnected from the dc power grid 20, so that the electric energy generated by the photovoltaic power generation system 10 is output to the ac power grid 30.
Optionally, with continued reference to fig. 2, the photovoltaic grid-connected device suitable for the ac/dc hybrid power distribution network further includes a signal generation module 800, where the signal generation module 800 is electrically connected to the first inverter circuit 100, the second inverter circuit 500, and the control module 600, respectively; the control module 600 is used for controlling the first inverter circuit 100 or the second inverter circuit 500 through the control signal generation module.
When the output voltage of the dc power grid 20 is inconsistent with the output voltage of the rectifying and filtering circuit 300, the control module 600 outputs the voltage regulating signal to regulate the output voltage of the first inverter circuit 100 through the control signal generating module 800, so that the output voltage of the dc power grid 20 can follow the output voltage of the rectifying and filtering circuit 300, and the demand of the user on the dc power is met. The voltage regulating signal may be a PWM pulse signal.
When the output voltage of the ac power grid 30 is inconsistent with the output voltage of the second inverter circuit 500, the control module 600 controls the signal generation module 800 to output the voltage regulation signal to regulate the output voltage of the second inverter circuit 500 (or to regulate the first inverter circuit 100 at the same time), so that the output voltage of the ac power grid 30 can follow the output voltage of the second inverter circuit 500, and the requirement of the user on the ac power is met.
EXAMPLE III
Fig. 3 is a block diagram of a structure of a photovoltaic grid-connected device suitable for an ac/dc hybrid power distribution network in a third embodiment of the present invention, and referring to fig. 3, a signal generating module includes a first signal generator 810 and a second signal generator 820, a control module includes a first control unit 610 and a second control unit 620, and a voltage detecting module includes a first voltage detecting unit 710, a second voltage detecting unit 720, a third voltage detecting unit 730, and a fourth voltage detecting unit 740;
the first signal generator 810 is electrically connected to the first control unit 610 and the first inverter circuit 100, the second signal generator 820 is electrically connected to the second control unit 620 and the second inverter circuit 500, the first voltage detection unit 710 is electrically connected to the rectification filter circuit 300 and the first control unit 610, the second voltage detection unit 720 is electrically connected to the dc power grid 20 and the first control unit 610, the third voltage detection unit 730 is electrically connected to the second inverter circuit 500 and the second control unit 620, and the fourth voltage detection unit 740 is electrically connected to the ac power grid 30 and the second control unit 620;
the first control unit 610 is configured to control the first inverter circuit 100 by controlling the first signal generator 810 when the switch 400 is turned on with the dc power grid 20, so as to control the output voltage of the dc power grid 20 to follow the output voltage of the rectifying and filtering circuit 300;
the second control unit 620 is configured to control the second inverter circuit 500 by controlling the second signal generator 820 when the switch 400 is turned on with the second inverter circuit 500, so as to control the output voltage of the ac power grid 30 to follow the output voltage of the second inverter circuit 500.
The switch 400 may be controlled by the first control unit 610 or the second control unit 620. The first control unit 610 and the second control unit 620 may be single-chip microcomputers. The first voltage detection unit 710 is configured to detect an output voltage of the rectifying and filtering circuit 300, the second voltage detection unit 720 is configured to detect an output voltage of the dc power grid 20, the third voltage detection unit 730 is configured to detect an output voltage of the second inverter circuit 500, and the fourth voltage detection unit 740 is configured to detect an output voltage of the ac power grid 30.
In the technical solution of this embodiment, the following control of the output voltage of the dc power grid or the ac power grid is implemented as follows: when the rectifying and filtering circuit 300 is conducted with the dc power grid 20, the first voltage detecting unit 710 detects the output voltage of the rectifying and filtering circuit 300 in real time, the second voltage detecting unit 720 detects the output voltage of the dc power grid 20 in real time, and when the output voltage of the dc power grid 20 is inconsistent with the output voltage of the rectifying and filtering circuit 300, the first control unit 610 controls the first signal generating module 810 to output the voltage regulating signal to regulate the output voltage of the first inverter circuit 100, so that the output voltage of the dc power grid 20 can follow the output voltage of the rectifying and filtering circuit 300, and the demand of a user on the dc power can be met. Wherein, the voltage regulating signal can be a PWM pulse signal
When the rectifying and filtering circuit 300 is connected to the second inverter circuit 500, that is, when the rectifying and filtering circuit 300 is connected to the ac power grid, the third voltage detecting unit 730 detects the output voltage of the second inverter circuit 500 in real time, the fourth voltage detecting unit 740 detects the output voltage of the ac power grid 30 in real time, and when the output voltage of the ac power grid 30 is inconsistent with the output voltage of the second inverter circuit 500, the second control unit 620 controls the second signal generating module 820 to output the voltage regulating signal to regulate the output voltage of the second inverter circuit 500, so that the output voltage of the ac power grid 30 can follow the output voltage of the second inverter circuit 500, and the requirement of the user on the ac power is met.
Optionally, the first signal generator 810 and the second signal generator 820 are pulse signal generators.
Alternatively, the first voltage detecting unit 710, the second voltage detecting unit 720, the third voltage detecting unit 730, and the fourth voltage detecting unit 740 are voltage transformers.
The first voltage detection unit 710, the second voltage detection unit 720, the third voltage detection unit 730, and the fourth voltage detection unit 740 may also be other voltage detection elements, such as hall voltage sensors.
Optionally, with continued reference to fig. 3, the photovoltaic grid-connected device suitable for the ac/dc hybrid power distribution network further includes a first capacitor C1, a first end of the first capacitor C1 is electrically connected to the first output end of the photovoltaic power generation system 10 and the first input end of the first inverter circuit 100, respectively, and a second end of the first capacitor C1 is electrically connected to the second output end of the photovoltaic power generation system 10 and the second input end of the first inverter circuit 100, respectively.
Wherein the first capacitor C1 is used for filtering.
Optionally, with continued reference to fig. 3, the first inverter circuit 100 includes a third switch S3, a fourth switch S4, a fifth switch S5 and a sixth switch S6, a first end of the third switch S3 is electrically connected to the first output terminal of the photovoltaic power generation system 10 and the first end of the fourth switch S4, respectively, a second end of the third switch S3 is electrically connected to the first end of the fifth switch S5 and the first end of the primary winding of the transformer 200, a second end of the fifth switch S5 is electrically connected to the second output terminal of the photovoltaic power generation system 10 and the second end of the sixth switch S6, respectively, and a first end of the sixth switch S6 is electrically connected to the second end of the fourth switch S4 and the second end of the primary winding of the transformer 200, respectively;
the second inverter circuit 500 includes a seventh switch S7, an eighth switch S8, a ninth switch S9, and a tenth switch S10, a first end of the seventh switch S7 is electrically connected to first ends of the switching circuit 400 and the eighth switch S8, respectively, a second end of the seventh switch S7 is electrically connected to a first end of the ninth switch S9 and a first input end of the ac power grid 30, a second end of the ninth switch S9 is electrically connected to second ends of the switching circuit 400 and the tenth switch S10, respectively, and a first end of the tenth switch S10 is electrically connected to a second end of the eighth switch S8 and a second input end of the ac power grid 30, respectively.
The first control unit 610 controls the first signal generating module 810 to output a voltage regulating signal, such as a pulse signal, and regulates the output voltage of the first inverter circuit 100 by regulating the third switch S3, the fourth switch S4, the fifth switch S5 and the sixth switch S6, so that the output voltage of the dc power grid 20 can follow the output voltage of the rectifying and filtering circuit 300.
The second control unit 620 outputs the voltage regulating signal by controlling the second signal generating module 820, and regulates the output voltage of the second inverter circuit 500 by regulating the seventh switch S7, the eighth switch S8, the ninth switch S9 and the tenth switch S10, so that the output voltage of the ac power grid 30 can follow the output voltage of the second inverter circuit 500.
Optionally, with continued reference to fig. 3, the rectifying-filtering circuit 300 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first inductor L1 and a second capacitor C2, wherein a cathode of the first diode D1 is electrically connected to a cathode of the second diode D2 and a first end of the first inductor L1, respectively, a second end of the first inductor L1 is electrically connected to a first end of the second capacitor C2 and the switching circuit 400, an anode of the first diode D1 is electrically connected to a second end of the secondary winding of the transformer 200 and a cathode of the third diode D3, an anode of the third diode D3 is electrically connected to an anode of the fourth diode D4 and a second end of the second capacitor C2, a cathode of the fourth diode D4 is electrically connected to an anode of the second diode D2 and a first end of the secondary winding of the transformer 200, respectively, and a second end of the second capacitor C2 is electrically connected to the switching circuit 400.
Optionally, the dc power grid 20 includes a fifth diode D5, an anode of the fifth diode D5 is electrically connected to the switching circuit 400, and a cathode of the fifth diode D5 is electrically connected to the dc power grid 20.
Among them, the fifth diode D5 may be an anti-reverse diode.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The utility model provides a photovoltaic grid-connected device suitable for alternating current-direct current mixes distribution network which characterized in that includes: the photovoltaic power generation system comprises a photovoltaic power generation system, a first inverter circuit, a transformer, a rectifying and filtering circuit, a second inverter circuit, a direct current power grid, an alternating current power grid, a change-over switch, a control module and a voltage detection module;
the photovoltaic power generation system is electrically connected with the first inverter circuit, the first inverter circuit is electrically connected with the transformer and the control module respectively, the transformer is electrically connected with the rectification filter circuit, the rectification filter circuit is electrically connected with the change-over switch, the change-over switch is electrically connected with the direct current power grid, the second inverter circuit and the control module respectively, the second inverter circuit is electrically connected with the alternating current power grid and the control module respectively, and the voltage detection module is electrically connected with the rectification filter circuit, the second inverter circuit, the direct current power grid, the alternating current power grid and the control module respectively;
the control module is used for controlling the on/off of the change-over switch and the direct current power grid or the second inverter circuit, and controlling the first inverter circuit to control the output voltage of the direct current power grid to follow the output voltage of the rectification filter circuit when controlling the on of the change-over switch and the direct current power grid, or controlling the second inverter circuit to control the output voltage of the alternating current power grid to follow the output voltage of the second inverter circuit when controlling the on of the change-over switch and the second inverter circuit.
2. The grid-connected photovoltaic device suitable for the alternating current-direct current hybrid power distribution network according to claim 1, wherein the change-over switch comprises a first switch, a second switch, a first contact, a second contact, a third contact and a fourth contact, the first contact is electrically connected with a first input end of the second inverter circuit, the second contact is electrically connected with a first input end of the direct current power grid, the third contact is electrically connected with a second input end of the second inverter circuit, and the fourth contact is electrically connected with a second input end of the direct current power grid;
the control module controls the switch to be connected with the direct current power grid, and comprises: the control module controls the first switch to be communicated with the second contact, and the second switch is communicated with the fourth contact;
the control module controls the switch to be connected with the second inverter circuit, and comprises: the control module controls the first switch to be communicated with the first contact, and the second switch is communicated with the third contact.
3. The photovoltaic grid-connected device suitable for the alternating current-direct current hybrid power distribution network according to claim 1, further comprising a signal generation module, wherein the signal generation module is electrically connected with the first inverter circuit, the second inverter circuit and the control module respectively; the control module is used for controlling the first inverter circuit or the second inverter circuit by controlling the signal generation module.
4. The photovoltaic grid-connected device suitable for the alternating current-direct current hybrid power distribution network according to claim 3, wherein the signal generation module comprises a first signal generator and a second signal generator, the control module comprises a first control unit and a second control unit, and the voltage detection module comprises a first voltage detection unit, a second voltage detection unit, a third voltage detection unit and a fourth voltage detection unit;
the first signal generator is electrically connected with the first control unit and the first inverter circuit respectively, the second signal generator is electrically connected with the second control unit and the second inverter circuit respectively, the first voltage detection unit is electrically connected with the rectification filter circuit and the first control unit respectively, the second voltage detection unit is electrically connected with the direct current power grid and the first control unit respectively, the third voltage detection unit is electrically connected with the second inverter circuit and the second control unit respectively, and the fourth voltage detection unit is electrically connected with the alternating current power grid and the second control unit respectively;
the first control unit is used for controlling the first inverter circuit by controlling the first signal generator when the change-over switch is conducted with the direct current power grid so as to control the output voltage of the direct current power grid to follow the output voltage of the rectification filter circuit;
the second control unit is used for controlling the second inverter circuit by controlling the second signal generator when the change-over switch is conducted with the second inverter circuit so as to control the output voltage of the alternating current power grid to follow the output voltage of the second inverter circuit.
5. The grid-connected photovoltaic device suitable for alternating current and direct current hybrid power distribution networks according to claim 4, wherein the first signal generator and the second signal generator are pulse signal generators.
6. The grid-connected photovoltaic device suitable for the alternating current-direct current hybrid power distribution network according to claim 4, wherein the first voltage detection unit, the second voltage detection unit, the third voltage detection unit and the fourth voltage detection unit are voltage transformers.
7. The grid-connected photovoltaic device suitable for ac/dc hybrid power distribution network according to claim 1, further comprising a first capacitor, wherein a first end of the first capacitor is electrically connected to the first output terminal of the photovoltaic power generation system and the first input terminal of the first inverter circuit, respectively, and a second end of the first capacitor is electrically connected to the second output terminal of the photovoltaic power generation system and the second input terminal of the first inverter circuit, respectively.
8. The pv grid-connection apparatus suitable for ac/dc hybrid power distribution network as claimed in claim 1, wherein the first inverter circuit comprises a third switch, a fourth switch, a fifth switch and a sixth switch, a first end of the third switch is electrically connected to the first output terminal of the pv power generation system and the first end of the fourth switch respectively, a second end of the third switch is electrically connected to the first end of the fifth switch and the first end of the primary transformer coil respectively, a second end of the fifth switch is electrically connected to the second output terminal of the pv power generation system and the second end of the sixth switch respectively, and a first end of the sixth switch is electrically connected to the second end of the fourth switch and the second end of the primary transformer coil respectively;
the second inverter circuit comprises a seventh switch, an eighth switch, a ninth switch and a tenth switch, wherein a first end of the seventh switch is electrically connected with the first ends of the switching circuit and the eighth switch respectively, a second end of the seventh switch is electrically connected with a first end of the ninth switch and a first input end of the alternating current power grid respectively, a second end of the ninth switch is electrically connected with the second ends of the switching circuit and the tenth switch respectively, and a first end of the tenth switch is electrically connected with a second end of the eighth switch and a second input end of the alternating current power grid respectively.
9. The photovoltaic grid-connected device suitable for ac/dc hybrid power distribution network according to claim 1, wherein the rectifying and filtering circuit comprises a first diode, a second diode, a third diode, a fourth diode, a first inductor and a second capacitor, a cathode of the first diode is electrically connected to a cathode of the second diode and a first end of the first inductor, respectively, a second end of the first inductor is electrically connected to a first end of the second capacitor and the switching circuit, respectively, an anode of the first diode is electrically connected to a second end of the secondary winding of the transformer and a cathode of the third diode, an anode of the third diode is electrically connected to an anode of the fourth diode and a second end of the second capacitor, respectively, and a cathode of the fourth diode is electrically connected to an anode of the second diode and a first end of the secondary winding of the transformer, respectively, the second end of the second capacitor is electrically connected with the switching circuit.
10. The grid-connected photovoltaic device suitable for a hybrid ac/dc power distribution network according to claim 1, wherein the dc power grid includes a fifth diode, an anode of the fifth diode is electrically connected to the switching circuit, and a cathode of the fifth diode is electrically connected to the dc power grid.
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| CN202010565590.8A CN111668872A (en) | 2020-06-19 | 2020-06-19 | Photovoltaic grid-connected device suitable for alternating current-direct current hybrid power distribution network |
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| CN202010565590.8A CN111668872A (en) | 2020-06-19 | 2020-06-19 | Photovoltaic grid-connected device suitable for alternating current-direct current hybrid power distribution network |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142693A (en) * | 2011-03-10 | 2011-08-03 | 西安交通大学 | Solar photovoltaic grid-connected inversion control system based on field programmable gate array (FPGA) |
| US20160118846A1 (en) * | 2014-10-28 | 2016-04-28 | Bin-Juine Huang | Isolated-Type Hybrid Solar Photovoltaic System and Switching Control Method |
| CN106385024A (en) * | 2016-09-27 | 2017-02-08 | 天津大学 | Modular electric energy router device and implementation method thereof |
| CN110676883A (en) * | 2019-11-07 | 2020-01-10 | 哈尔滨理工大学 | Novel inversion grid-connected device with digital-analog combined control |
-
2020
- 2020-06-19 CN CN202010565590.8A patent/CN111668872A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142693A (en) * | 2011-03-10 | 2011-08-03 | 西安交通大学 | Solar photovoltaic grid-connected inversion control system based on field programmable gate array (FPGA) |
| US20160118846A1 (en) * | 2014-10-28 | 2016-04-28 | Bin-Juine Huang | Isolated-Type Hybrid Solar Photovoltaic System and Switching Control Method |
| CN106385024A (en) * | 2016-09-27 | 2017-02-08 | 天津大学 | Modular electric energy router device and implementation method thereof |
| CN110676883A (en) * | 2019-11-07 | 2020-01-10 | 哈尔滨理工大学 | Novel inversion grid-connected device with digital-analog combined control |
Non-Patent Citations (1)
| Title |
|---|
| 陈佳玺: "面向直流配电系统的光伏并网方式的研究", 《中国优秀硕士学位论文全文数据库（电子期刊）工程科技Ⅱ辑》 * |
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