CN212367150U - Off-grid and grid-connected inverter and power supply system - Google Patents
Off-grid and grid-connected inverter and power supply system Download PDFInfo
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- CN212367150U CN212367150U CN202020869448.8U CN202020869448U CN212367150U CN 212367150 U CN212367150 U CN 212367150U CN 202020869448 U CN202020869448 U CN 202020869448U CN 212367150 U CN212367150 U CN 212367150U
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Abstract
The utility model relates to a power electronic technology field discloses a from grid-connected inverter and power supply system. The off-grid and on-grid inverter comprises a booster circuit, a direct current to alternating current circuit, a first change-over switch, a second change-over switch, a third change-over switch and a driving circuit, wherein the booster circuit is connected with a direct current power supply and used for boosting direct current voltage output by the direct current power supply and outputting the boosted direct current voltage, the direct current to alternating current circuit is used for converting the boosted direct current voltage into alternating current output voltage, and the first change-over switch, the second change-over switch and the third change-over switch are used for gating an output end, a load and a power grid of the direct current to alternating current circuit under the driving of the driving circuit. Through the mode, the power can be flexibly supplied to the load, grid-connected power generation can be performed when the power grid needs to be adjusted, and the compatibility between the load type and the power grid type is realized.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to a from inverter and power supply system that are incorporated into power networks.
Background
An inverter is a device that can convert a direct current input into an alternating current output, and is used for supplying power to a load or a power consumption device. The off-grid inverter generally converts direct current output by a low-voltage storage battery or a direct current power supply into alternating current with stable and unchangeable output voltage, provides stable power supplies for different loads, and has the output current changed along with the change of the load size and the alternating current output voltage always stable and unchangeable. The grid-connected inverter generally converts direct current of a photovoltaic panel or a high-voltage storage battery into alternating current, and the alternating current is used for being transmitted to a power grid, so that the purposes of photovoltaic power generation or energy conservation and emission reduction are achieved.
In the process of implementing the present invention, the inventor finds that the prior art has at least the following technical problems: the direct current input of the two inverters is usually different, the voltage and current forms of the alternating current output are also different, the alternating current output of the off-grid inverter can only be connected with a specific load, cannot be connected with and interacted with a power grid, and cannot adjust the electric energy of the power grid; the grid-connected inverter can normally work only when a power grid is normal or exists, and cannot provide electric energy for a load when the power grid does not exist. The two inverters are suitable for specific application occasions, and cannot realize the functions of supplying power to a load and realizing grid-connected power generation when the power grid needs to be adjusted.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem, the embodiment of the utility model provides a from grid-connected inverter and power supply system can solve the unable realization of current power supply system and can supply power for the load, can be again when needs adjust the electric wire netting the technical problem of grid-connected electricity generation.
The embodiment of the utility model provides a for solving above-mentioned technical problem provides following technical scheme:
in a first aspect, an embodiment of the present invention provides an off-grid and grid-connected inverter, including: the boost circuit is used for being connected with a direct-current power supply, and the boost circuit boosts the direct-current voltage output by the direct-current power supply and outputs the boosted direct-current voltage; the direct current-to-alternating current circuit is connected with the boosting circuit and is used for converting the boosted direct current voltage to obtain alternating current output voltage; the first change-over switch is connected with the direct current-to-alternating current circuit; the second change-over switch is used for being connected with the first change-over switch and the load; the third change-over switch is used for being connected with the first change-over switch, the second change-over switch and the power grid; the driving circuit is respectively connected with the first change-over switch, the second change-over switch and the third change-over switch and is used for providing driving for the first change-over switch, the second change-over switch and the third change-over switch; when the driving circuit drives only the second change-over switch, the direct current-to-alternating current circuit is communicated with the load, when the driving circuit drives only the third change-over switch, the power grid is communicated with the load, and when the driving circuit drives only the first change-over switch and the third change-over switch, the direct current-to-alternating current circuit is communicated with the power grid and the load respectively.
Optionally, the boost circuit comprises: the conversion isolation circuit is used for being connected with the direct-current power supply and converting direct-current voltage output by the direct-current power supply into alternating-current voltage; and the rectification filter circuit is connected with the conversion isolating circuit and is used for rectifying and filtering the alternating-current voltage output by the conversion isolating circuit and outputting the boosted direct-current voltage.
Optionally, the conversion isolation circuit comprises: the modulation circuit is used for being connected with the direct current power supply and modulating the direct current voltage output by the direct current power supply to generate high-frequency pulses; and the high-frequency transformer is respectively used for being connected with the direct-current power supply and the modulation circuit, and transmits the energy of the primary side to the secondary side under the high-frequency pulse generated by the modulation circuit to obtain the alternating-current voltage.
Optionally, the rectifying and filtering circuit includes: the rectification circuit is connected with the conversion isolation circuit and used for rectifying the alternating-current voltage output by the conversion isolation circuit and outputting pulsating direct-current voltage; and the filter circuit is connected with the rectifying circuit and is used for filtering the pulsating direct-current voltage output by the rectifying circuit and outputting the boosted direct-current voltage.
Optionally, the dc-to-ac converter circuit includes an inverter circuit, and the inverter circuit is connected to the voltage boost circuit and is configured to convert the boosted dc voltage into a sine wave ac voltage.
Optionally, the dc-to-ac circuit further includes a filter circuit, and the filter circuit is connected to the inverter circuit and configured to filter the sine wave ac voltage to obtain the ac output voltage.
Optionally, the first switch includes a first normally closed contact and a first normally open contact, and when the driving circuit drives the first switch, the first normally open contact is connected to the dc-to-ac circuit.
Optionally, the second change-over switch includes a second normally closed contact and a second normally open contact, the second normally closed contact is connected to the first normally open contact, the second normally open contact is connected to the first normally closed contact, and when the driving circuit drives the second change-over switch, the second normally open contact is connected to the load.
Optionally, the third switch includes a third normally open contact, the third normally open contact is connected to the first normally open contact and the second normally closed contact, and the third normally open contact is closed when the driving circuit drives the third switch, so as to connect the first normally open contact and the second normally closed contact to the power grid through the third normally open contact.
In a second aspect, an embodiment of the present invention provides a power supply system, including the grid-off inverter as described above.
The embodiment of the utility model provides a beneficial effect is: different from the prior art, the utility model provides a leave and be incorporated into power networks inverter and power supply system. The off-grid and on-grid inverter comprises a booster circuit, a direct current to alternating current circuit, a first change-over switch, a second change-over switch, a third change-over switch and a driving circuit, wherein the booster circuit is connected with a direct current power supply and used for boosting direct current voltage output by the direct current power supply and outputting the boosted direct current voltage, the direct current to alternating current circuit is used for converting the boosted direct current voltage into alternating current output voltage, and the first change-over switch, the second change-over switch and the third change-over switch are used for gating an output end, a load and a power grid of the direct current to alternating current circuit under the driving of the driving circuit. The embodiment of the utility model provides a can be for the load power supply in a flexible way to also can carry out the electricity generation of being incorporated into the power networks when needs adjust the electric wire netting, realize the compatibility to load type and electric wire netting type demand.
Drawings
The embodiments are illustrated by way of example only in the accompanying drawings, in which like reference numerals refer to similar elements and which are not to be construed as limiting the embodiments, and in which the figures are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of an off-grid and on-grid inverter according to the present invention;
fig. 2 is a schematic structural diagram of an off-grid and on-grid inverter according to another embodiment of the present invention;
fig. 3 is a schematic diagram of an operating state of an off-grid and on-grid inverter according to an embodiment of the present invention;
fig. 4 is a schematic view of another operating state of an off-grid and on-grid inverter according to an embodiment of the present invention;
fig. 5 is a schematic view of another operating state of an off-grid and on-grid inverter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
In a first aspect, the present invention provides a power supply system, the power supply system includes a dc power supply (for example, a storage battery), an inverter connected to a grid, a load (a power consumption device), and a power grid, and the dc power supply outputs a suitable voltage or current to the load or the power grid after the dc power supply is connected to the grid. The power supply system provides the following three power supply modes for different application occasions:
grid bypass mode: the power grid is communicated with the load, and the power supply of the power grid to the load is realized.
Off-grid operating mode: the output of the off-grid and grid-connected inverter is communicated with the load, so that the direct-current power supply supplies power to the load.
Grid-connected operation mode: the output of the off-grid and grid-connected inverter is communicated with the load and the power grid, so that the electric energy of the direct current power supply is transmitted to the power grid after passing through the off-grid and grid-connected inverter, or the electric energy is supplied to the load.
Therefore, the utility model provides a power supply system can be to the application scenario of difference, can be for the load power supply, can adjust the electric energy of electric wire netting again, solves among the prior art can only be for specific load power supply or can only realize the technical problem to the regulation of electric wire netting electric energy, realizes the compatibility to load type and electric wire netting type demand.
In a second aspect, please refer to fig. 1, fig. 1 is a schematic structural diagram of an off-grid and on-grid inverter according to the present invention. As shown in fig. 1, the grid-disconnected inverter 100 includes a voltage boosting circuit 10, a dc-to-ac converter circuit 20, a first switch 30, a second switch 40, a third switch 50, and a driving circuit 60, the voltage boosting circuit 10 is connected to a dc power supply to boost a dc voltage output from the dc power supply and output the boosted dc voltage, the dc-to-ac converter circuit 20 is connected to the voltage boosting circuit 10 to convert the boosted dc voltage into an ac output voltage, the first switch 30 is connected to the dc-to-ac converter circuit 20, the second switch 40 is connected to the first switch 30 and a load, the third switch 50 is connected to the first switch 30, the second switch 40, and a grid, the driving circuit 60 is connected to the first switch 30, the second switch 40, and the third switch 50, respectively, and the driving circuit 60 may be the first switch 30, the second switch 30, the third switch 40, and the third switch 50, The second changeover switch 40 and the third changeover switch 50 are driven, the output terminal of the dc-to-ac circuit 20 communicates with the load when the drive circuit 60 drives only the second changeover switch 40, the grid communicates with the load when the drive circuit 60 drives only the third changeover switch 50, and the output terminal of the dc-to-ac circuit 20 communicates with the grid and the load when the drive circuit 60 drives only the first changeover switch 30 and the third changeover switch 50, respectively.
In this embodiment, when the driving circuit 60 drives only the second switch 40, the output of the dc-to-ac circuit 20 passes through the first switch 30 and the second switch 40 in sequence and then is transmitted to the load, and at this time, the off-grid operation state is achieved, and the electric energy output by the dc power supply supplies power to the load; when the driving circuit only drives the third change-over switch 50, the electric energy of the power grid is transmitted to the load after passing through the third change-over switch 50 and the second change-over switch 40 in sequence, at this time, the power grid is in a bypass state, and the electric energy of the power grid supplies power to the load; when the driving circuit 60 drives only the first switch 30 and the third switch 50, the output end of the dc-to-ac circuit 20 is connected to the grid and the load, respectively, and in this case, the grid-connected operation state is achieved, and the electric energy output by the dc power source can be transmitted to the grid to adjust the grid or supply power to the load. Therefore, in the present embodiment, the first change-over switch 30, the second change-over switch 40, and the third change-over switch 50 are used to switch on the output end of the dc-to-ac circuit 20, the grid, and the load, so that the power demand of the load can be flexibly met, and the grid-connected power generation can be performed when the grid needs to be adjusted, so as to realize compatibility between the load type and the grid type demand.
The driving circuit 60 can drive the first switch 30, the second switch 40, and the third switch 50, and the driving circuit 60 may be different for different switches, for example, when the first switch 30, the second switch 40, and the third switch 50 are all relay switches, the driving circuit 60 is any suitable integrated circuit driver or driving chip, for example, the integrated circuit driver 2003, the selection of the model may be determined according to business requirements, and when the first switch 30, the second switch 40, and the third switch 50 are other switch devices or switch groups, the driving circuit 60 selects according to the type of the specific switch device, which is not described herein.
Referring to fig. 2, fig. 2 is a schematic diagram of a grid-off inverter according to another embodiment of the present invention. As shown in fig. 2, the booster circuit 10 includes a conversion isolation circuit 11 and a rectification filter circuit 12, the conversion isolation circuit 11 is connected to the dc power supply and is capable of converting the dc voltage output from the dc power supply into an ac voltage, and the rectification filter circuit 12 is connected to the conversion isolation circuit 11 and is capable of rectifying and filtering the ac voltage output from the conversion isolation circuit 11 and outputting a dc voltage boosted with respect to the dc voltage output from the dc power supply.
In some embodiments, the converting and isolating circuit 11 includes a modulation circuit 111 and a high frequency transformer 112, the modulation circuit 111 is connected to the dc power source and modulates the dc voltage outputted from the dc power source to generate high frequency pulses, the high frequency transformer 112 is connected to the dc power source and the modulation circuit 111, respectively, and the high frequency transformer 112 transmits the energy of the primary side to the secondary side under the high frequency pulses generated by the modulation circuit 111 to obtain the ac voltage. The high frequency transformer 112 can also serve as an isolation to isolate the dc input from the ac output.
In some embodiments, the modulation circuit 111 includes a first MOS transistor Q1 and a second MOS transistor Q2, a source of the first MOS transistor Q1 and a source of the second MOS transistor Q2 are both connected to a negative electrode of a dc power supply, a drain of the first MOS transistor Q1 is connected to one end of a primary side of the high-frequency transformer T1, a drain of the second MOS transistor Q2 is connected to the other end of the primary side of the high-frequency transformer T1, a gate of the first MOS transistor Q1 and a gate of the second MOS transistor Q2 are both connected to an external drive, the external drive drives the first MOS transistor Q1 and the second MOS transistor Q2 by generating a square wave signal with a preset duty ratio, and the first MOS transistor Q1 and the second MOS transistor Q2 are used to generate a high-frequency pulse, where the high-frequency transformer T1 transmits energy of the primary side.
In some embodiments, as shown in fig. 2, the rectifying and filtering circuit 12 includes a rectifying circuit 121 and a filtering circuit 122, the rectifying circuit 121 is connected to the conversion isolation circuit 11 and is capable of rectifying the ac voltage output by the conversion isolation circuit 11 and outputting a pulsating dc voltage, and the filtering circuit 122 is connected to the rectifying circuit 121 and is capable of filtering the pulsating dc voltage output by the rectifying circuit 121 and outputting a boosted dc voltage.
In some embodiments, the rectifying circuit 121 includes a rectifying bridge composed of a diode D1, a diode D2, a diode D3, and a diode D4, a diode D1, a diode D2, a diode D3, and a diode D4, and can rectify the ac voltage at the secondary side of the high frequency transformer T1. The filter circuit 122 includes a capacitor C1, and the ac voltage is processed by the rectifier bridge and the capacitor C1 to output a smooth dc voltage.
In some embodiments, the dc-to-ac circuit 20 includes an inverter circuit 21, and the inverter circuit 21 is connected to the voltage boosting circuit 10, and can convert the dc voltage boosted by the voltage boosting circuit 10 into a sine wave ac voltage.
The inverter circuit 21 includes a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5 and a sixth MOS transistor Q6, and the third MOS transistor Q3, the fourth MOS transistor Q4, the fifth MOS transistor Q5 and the sixth MOS transistor Q6 form a full-bridge inverter circuit, which can convert a dc voltage into a suitable ac voltage. The inverter circuit 21 may be changed to any other form as long as the object of the present embodiment can be achieved.
The dc-to-ac circuit 20 further includes a filter circuit 22, and the filter circuit 22 is connected to the inverter circuit 21 and is configured to filter the sine wave ac voltage output from the inverter circuit 21 to obtain an ac output voltage. The ac output voltage may be a suitable voltage available to the load, for example a 220V ac voltage.
The filter circuit 22 includes at least one inductor, and the at least one inductor may be connected in series to any one of the electrodes at the output terminal of the inverter circuit 21. In some embodiments, inductors, such as the first inductor L1 and the second inductor L2 in fig. 2, are connected in series to both electrodes of the output terminal of the inverter circuit 21. In some embodiments, the filter circuit 22 further includes a capacitor C2, and the capacitor C2 is connected in parallel to two electrodes at the output end of the inverter circuit 21. The inductor and/or capacitor in the filter circuit 22 has a blocking effect on the output of the inverter circuit 21, so that the damage probability of instantaneous high voltage or large current can be greatly reduced.
The first switch 30 includes a first normally closed contact NC _1 and a first normally open contact NO _1, and when the drive circuit 60 drives the first switch 30, the first normally open contact NO _1 is connected to the output terminal of the dc-to-ac circuit 20, and when the drive circuit 60 does not drive the first switch 30, the first normally closed contact NC _1 is connected to the output terminal of the dc-to-ac circuit 20.
The second change-over switch 40 includes a second normally closed contact NC _2 and a second normally open contact NO _2, the second normally closed contact NC _2 is connected with the first normally open contact NO _1, the second normally open contact NO _2 is connected with the first normally closed contact NC _1, when the second change-over switch 40 is not driven by the driving circuit 60, the second normally closed contact NC _2 is connected with the load, and when the second change-over switch 40 is driven by the driving circuit 60, the second normally open contact NO _2 is connected with the load.
The third change-over switch 50 includes a third normally-open contact NO _3, the third normally-open contact NO _3 is connected between the first normally-open contact NO _1 and the second normally-closed contact NC _2, when the third change-over switch 50 is not driven by the driving circuit 60, the third normally-open contact NO _3 is disconnected and connected with the power grid, and when the third change-over switch 50 is driven by the driving circuit 60, the third normally-open contact NO _3 is connected with the power grid.
To illustrate various embodiments of the present invention in more detail, it is described below in conjunction with fig. 3-5.
As shown in fig. 3, when the driving circuit 60 drives only the second switch 40, the output end of the dc-to-ac circuit 20 is connected to the load through the normally closed contact NC _1 of the first switch 30 and the normally open contact NO _2 of the second switch 40, so that the electric energy output by the dc power supply is supplied to the load, and at this time, the grid-disconnected inverter 100 operates in the grid-disconnected operation state.
As shown in fig. 4, when the driving circuit 60 drives only the third switch 50, the power grid is connected to the load through the normally open contact NO _3 of the third switch 50 and the normally closed contact NC _2 of the second switch 40, so that the power grid supplies power to the load, and at this time, the grid-off-grid inverter 100 works in a grid bypass state.
As shown in fig. 5, when the driving circuit 60 drives only the first switch 30 and the third switch 50, the output terminal of the dc-to-ac circuit 20 is connected to the load through the normally open contact NO _1 of the first switch 30 and the normally closed contact NC _2 of the second switch 40, and the output terminal of the dc-to-ac circuit 20 is connected to the grid through the normally open contact NO _1 of the first switch 30 and the normally open contact NO _3 of the third switch 50, so that the electric energy output by the dc power supply can be supplied to the load and adjusted, and the off-grid and on-grid inverter device 100 operates in the grid-connected operation state.
Finally, it is to be understood that the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are intended as additional limitations on the scope of the invention, as these embodiments are provided so that the disclosure will be thorough and complete. In addition, under the idea of the present invention, the above technical features are combined with each other continuously, and many other variations of the present invention in different aspects as described above are considered as the scope of the present invention; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An off-grid and grid-connected inverter device, comprising:
the boost circuit is used for being connected with a direct-current power supply, and the boost circuit boosts the direct-current voltage output by the direct-current power supply and outputs the boosted direct-current voltage;
the direct current-to-alternating current circuit is connected with the boosting circuit and is used for converting the boosted direct current voltage to obtain alternating current output voltage;
the first change-over switch is connected with the direct current-to-alternating current circuit;
the second change-over switch is used for being connected with the first change-over switch and a load;
the third change-over switch is used for connecting the first change-over switch, the second change-over switch and a power grid;
the driving circuit is respectively connected with the first change-over switch, the second change-over switch and the third change-over switch and is used for providing driving for the first change-over switch, the second change-over switch and the third change-over switch;
when the driving circuit drives only the second change-over switch, the direct current-to-alternating current circuit is communicated with the load, when the driving circuit drives only the third change-over switch, the power grid is communicated with the load, and when the driving circuit drives only the first change-over switch and the third change-over switch, the direct current-to-alternating current circuit is communicated with the power grid and the load respectively.
2. The grid-disconnected inverter device according to claim 1, wherein the boost circuit includes:
the conversion isolation circuit is used for being connected with the direct-current power supply and converting direct-current voltage output by the direct-current power supply into alternating-current voltage;
and the rectification filter circuit is connected with the conversion isolating circuit and is used for rectifying and filtering the alternating-current voltage output by the conversion isolating circuit and outputting the boosted direct-current voltage.
3. The grid-disconnected and grid-connected inverter device according to claim 2, wherein the conversion isolation circuit comprises:
the modulation circuit is used for being connected with the direct current power supply and modulating the direct current voltage output by the direct current power supply to generate high-frequency pulses;
and the high-frequency transformer is respectively used for being connected with the direct-current power supply and the modulation circuit, and transmits the energy of the primary side to the secondary side under the high-frequency pulse generated by the modulation circuit to obtain the alternating-current voltage.
4. The grid-disconnected and grid-connected inverter device according to claim 2, wherein the rectifying and filtering circuit comprises:
the rectification circuit is connected with the conversion isolation circuit and used for rectifying the alternating-current voltage output by the conversion isolation circuit and outputting pulsating direct-current voltage;
and the filter circuit is connected with the rectifying circuit and is used for filtering the pulsating direct-current voltage output by the rectifying circuit and outputting the boosted direct-current voltage.
5. The grid-disconnection-connection inverter device according to claim 1, wherein the dc-to-ac converter circuit includes an inverter circuit connected to the booster circuit, and configured to convert the boosted dc voltage into a sine-wave ac voltage.
6. The grid-disconnected and grid-connected inverter device according to claim 5, wherein the DC-AC circuit further comprises a filter circuit, and the filter circuit is connected with the inverter circuit and is used for filtering the sine wave AC voltage to obtain the AC output voltage.
7. The grid-disconnection-connection inverter device according to claim 1, wherein the first switch includes a first normally closed contact and a first normally open contact, and when the driving circuit drives the first switch, the first normally open contact is connected to the dc-to-ac circuit.
8. The grid-disconnection-connection inverter device according to claim 7, wherein the second switch comprises a second normally closed contact and a second normally open contact, the second normally closed contact is connected with the first normally open contact, the second normally open contact is connected with the first normally closed contact, and when the driving circuit drives the second switch, the second normally open contact is connected with the load.
9. The grid-disconnection-connection inverter device according to claim 8, wherein the third switch includes a third normally-open contact, the third normally-open contact is connected to the first normally-open contact and the second normally-closed contact, and when the driving circuit drives the third switch, the third normally-open contact is connected to the grid.
10. A power supply system comprising the off-grid inverter apparatus according to any one of claims 1 to 8.
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| CN202020869448.8U CN212367150U (en) | 2020-05-21 | 2020-05-21 | Off-grid and grid-connected inverter and power supply system |
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| CN202020869448.8U CN212367150U (en) | 2020-05-21 | 2020-05-21 | Off-grid and grid-connected inverter and power supply system |
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Address after: 518000 19th floor, building 1, kaidar group center building, No. 168, Tongsha Road, Xinwei community, Xili street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen Delian Minghai New Energy Co.,Ltd. Address before: 701-3, building 2, kaidar group center building, 168 Tongsha Road, Xili street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Poweroak Newener Co.,Ltd. |
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