CN218733282U - Photovoltaic power generation system - Google Patents
Photovoltaic power generation system Download PDFInfo
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- CN218733282U CN218733282U CN202222689591.0U CN202222689591U CN218733282U CN 218733282 U CN218733282 U CN 218733282U CN 202222689591 U CN202222689591 U CN 202222689591U CN 218733282 U CN218733282 U CN 218733282U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model provides a photovoltaic power generation system, the system comprises a first type photovoltaic module, one or more second type photovoltaic modules and a photovoltaic inversion module, wherein the two ends of the first type photovoltaic module and the second type photovoltaic module are connected with the photovoltaic inversion module; the first-class photovoltaic module comprises at least two first-class photovoltaic components and one-to-many on-off device and is suitable for providing starting voltage for the photovoltaic inverter module; the at least two first-type photovoltaic assemblies are connected to the one-to-many on-off device in parallel; the second type photovoltaic module comprises a second type photovoltaic assembly and an automatic control on-off device connected in series with the second type photovoltaic assembly. The problem that the inverter cannot be started is solved, and the limitation of the on-off technology for automatically detecting the current of the main loop on the total power and the scale of the photovoltaic power generation system is broken through.
Description
Technical Field
The utility model relates to a photovoltaic power generation technical field, concretely relates to photovoltaic power generation system.
Background
Due to the renewable and clean nature of solar energy, the photovoltaic grid-connected power generation technology is developed rapidly, and the photovoltaic power generation is widely applied nowadays. But we have to face the test they bring while enjoying the convenience they bring. That is, in the process of utilizing photovoltaic power generation, the problem of safe use, for example, when a photovoltaic power station system breaks down and needs to be maintained, or when rescue workers need to enter, such as earthquake, fire, flood, and the like, even if the power supply of a power grid is cut off, because the photovoltaic module still generates power, high-voltage electric energy which may endanger life safety still exists in the system. In a traditional series system, the voltage of the whole series of lines is accumulated, the voltage can generally reach the high voltage of 600V-1000V, and the direct current arc discharge phenomenon is very easy to cause due to the loosening of the joint contact of the photovoltaic module, poor contact, moisture of the electric wire, insulation breakage and the like, so that a fire disaster is caused. Therefore, before the photovoltaic power generation system is maintained, a circuit of the photovoltaic power generation system needs to be turned off in advance, the voltage of the photovoltaic power generation system is reduced to the voltage of a single photovoltaic module, and the condition that maintenance personnel suffer electric shock during maintenance is avoided.
If only the inverter is turned off, the photovoltaic module continues to generate power and generate high voltage, which can cause life hazards to the maintenance personnel. Therefore, the circuit of the photovoltaic power generation system is shut down, only the inverter cannot be shut down, and all photovoltaic modules are disconnected from the main loop. After the maintenance of the photovoltaic power generation system is finished, the inverter needs to be started, all photovoltaic modules are connected into the main loop, and electric power can be merged into a power grid.
In the prior art, an electronic device for controlling a photovoltaic module to be turned on is a photovoltaic turn-off control system. The system has a plurality of control modes, wherein one mode is that the photovoltaic turn-off control system automatically detects the current of a main loop of the photovoltaic power generation system and controls the on-off of the photovoltaic module based on the current value. Disconnecting the photovoltaic module from the main loop when detecting that the main loop has no current; and when the current of the main loop is detected, the photovoltaic module is connected into the main loop. However, this technique has the following disadvantages:
under specific conditions, a photovoltaic power generation system using the technology cannot reach the starting voltage of the inverter, so that the inverter is shut down: because the input voltage of the inverter is equal to the sum of the voltages of the photovoltaic components accessed in the main loop, the starting voltages of the inverters in different models are different (as low as 40V and as high as above 550V), and the starting voltages of the inverters can be met by a single photovoltaic component; the starting voltage of some inverters needs to be satisfied by a plurality of photovoltaic modules. The photovoltaic power generation system corresponds to a plurality of photovoltaic modules and a plurality of turn-off control systems, each turn-off control system works independently, and the time for detecting the current of the main loop by each turn-off control system is inconsistent, so that the time for each photovoltaic module to access the main loop is inconsistent. If the number of the photovoltaic modules which are firstly connected is too small when the inverter is started, so that the voltage cannot reach the starting voltage of the inverter, the inverter cannot normally work, the main loop is disconnected, and the current is interrupted. Since the main loop has no current, the photovoltaic turn-off control system actively disconnects the photovoltaic module from the main loop. Under this mechanism, the photovoltaic module will always be unable to access the main loop. The photovoltaic power generation system built based on the technology can only select the inverter with the working voltage smaller than the voltage of a single photovoltaic module, and the power and the scale of the whole photovoltaic power generation system are limited.
The above problems are currently in need of solution.
SUMMERY OF THE UTILITY MODEL
The utility model discloses overcome one of the above-mentioned shortcoming of prior art, provide a photovoltaic power generation system.
The utility model provides a technical scheme that its technical problem adopted is: a photovoltaic power generation system comprises a first type photovoltaic module, one or more second type photovoltaic modules and a photovoltaic inversion module, wherein two ends of the first type photovoltaic module and the second type photovoltaic module are connected with the photovoltaic inversion module; the first-class photovoltaic module comprises at least two first-class photovoltaic components and one-to-many on-off device and is suitable for providing starting voltage for the photovoltaic inverter module; the at least two first-type photovoltaic assemblies are connected to the one-to-many on-off device in parallel; the second type photovoltaic module comprises a second type photovoltaic assembly and an automatic control on-off device connected in series with the second type photovoltaic assembly; the photovoltaic inversion module is suitable for enabling the photovoltaic inversion module to start working based on the starting voltage provided by the first type of photovoltaic module, and electricity generated by the second type of photovoltaic module is merged into a power grid; the first type of photovoltaic module and the second type of photovoltaic module are connected in series.
Optionally, the number of the first type photovoltaic modules is based on the starting voltage of the inverter.
Optionally, the one-to-many switching device is adapted to control the at least two first-type photovoltaic modules to be synchronously connected to the main loop of the photovoltaic power generation system.
Optionally, the automatic on-off device includes: the device comprises a voltage conversion module, a microcontroller, a switching device and a current acquisition module; the voltage conversion module is connected with the second type of photovoltaic module and used for converting high voltage output by the second type of photovoltaic module into low voltage; the other end of the voltage conversion module is connected with one end of the microcontroller and used for supplying power to the microcontroller; one end of the current acquisition module is connected with one end of the microcontroller and used for controlling the microcontroller to work; the other end of the microcontroller is connected with the control end of the switch device and used for controlling the on-off of the switch device.
Optionally, the automatic control on-off device further comprises a diode device; one end of the diode device is connected with the second pole of the switch device, and the other end of the diode device is connected with one end of the second type of photovoltaic module; the diode device is configured to circulate a main loop current from the diode device when the switching device is closed.
Optionally, the switching device includes one of a MOS transistor, an IGBT, a thyristor, a triode, and a relay.
The utility model discloses there is following advantage in prior art relatively: the utility model provides a photovoltaic power generation system, the system includes a first kind photovoltaic module and one or more second kind photovoltaic module and a photovoltaic contravariant module, the both ends of first kind photovoltaic module and second kind photovoltaic module are connected the photovoltaic contravariant module; the first-class photovoltaic module comprises at least two first-class photovoltaic components and one-to-many on-off device and is suitable for providing starting voltage for the photovoltaic inverter module; the at least two first-type photovoltaic assemblies are connected to the one-to-many on-off device in parallel; the second photovoltaic module comprises a second photovoltaic component and an automatic control on-off device connected in series with the second photovoltaic component; the photovoltaic inversion module is suitable for enabling the photovoltaic inversion module to start working based on the starting voltage provided by the first type of photovoltaic module, and electricity generated by the second type of photovoltaic module is merged into a power grid; the first type of photovoltaic module and the second type of photovoltaic module are connected in series. The multiple photovoltaic modules of the first type are connected to the one-to-multiple on-off device in parallel, so that the one-to-multiple on-off device can synchronously control the multiple photovoltaic modules of the first type to be connected into the main loop of the photovoltaic power generation system, and the time of the photovoltaic modules to be connected into the main loop is further ensured to be consistent, so that the normal operation of the photovoltaic power generation system is ensured.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of a photovoltaic power generation system provided by an embodiment of the present invention.
Fig. 2 is a simplified circuit diagram of an automatic on-off device according to an embodiment of the present invention.
Reference numerals:
1-a first type of photovoltaic module;
2-a second type of photovoltaic module;
3-a photovoltaic inverter module;
11-a first type of photovoltaic module;
12-one-drive-many on-off device;
21-a second type of photovoltaic module;
22-automatically controlled on-off device;
220-voltage conversion module;
221-a microcontroller;
222-a switching device;
223-a current collection module;
d-bypass diode.
Detailed Description
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations as a sequential process, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of example embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.
For the sake of convenience in the following understanding, the operation principle of the photovoltaic power generation system will be explained.
The photovoltaic module converts light energy into direct current, the direct current is converted into alternating current under the action of the inverter, the alternating current is transmitted to a power grid, and finally the functions of power utilization and internet surfing are achieved. Specifically, a photovoltaic power generation system is connected with a plurality of photovoltaic modules in series, current generated by a single photovoltaic module is connected into a main loop through a cable, and the current of the main loop is merged into a power grid through an inverter. When the inverter is connected, the main loop of the photovoltaic power generation system has current. When the inverter is disconnected, the photovoltaic power generation system is in a disconnected state, and the main loop has no current.
Example 1
Referring to fig. 1, the present invention provides a schematic structural diagram of a photovoltaic power generation system.
As an example, the present invention provides a photovoltaic power generation system, which comprises a first type photovoltaic module 1, one or more second type photovoltaic modules 2 and a photovoltaic inversion module 3, wherein both ends of the first type photovoltaic module 1 and the second type photovoltaic module 2 are connected to the photovoltaic inversion module 3; the first-class photovoltaic module 1 comprises at least two first-class photovoltaic components 11 and one-to-many on-off device 12 and is suitable for providing starting voltage for the photovoltaic inverter module 3; wherein, the at least two first-class photovoltaic modules 11 are connected in parallel to the one-to-many on-off device 12; the second type photovoltaic module 2 comprises a second type photovoltaic assembly 21 and an automatic control on-off device 22 connected in series with the second type photovoltaic assembly; the photovoltaic inverter module 3 is adapted to start the photovoltaic inverter module 3 to work based on the starting voltage provided by the first type photovoltaic module 1, and to incorporate the electricity generated by the second type photovoltaic module 2 into a power grid; the first type of photovoltaic module 1 and the second type of photovoltaic module 2 are connected in series.
Optionally, the number of the first type photovoltaic modules 11 is determined by the starting voltage of the photovoltaic inverter module 3. That is, when the starting voltage of the photovoltaic inverter module 3 is too high, the plurality of first-type photovoltaic modules 11 are synchronously connected in parallel to the first-type photovoltaic module 1, so that when the inverter module 3 is started, the plurality of first-type photovoltaic modules 11 connected with the inverter module can be synchronously controlled to work together through the one-to-many on-off device 12, so that the required working voltage is provided for the inverter module 3, and further, the subsequent power generation of the second-type photovoltaic module 2 is effectively ensured.
Optionally, the number of the second type photovoltaic modules 21 is obtained by subtracting the generated power of the plurality of first type photovoltaic modules 11 from the planned generated power of the whole photovoltaic power generation system, and the rest power is provided by the second type photovoltaic modules 21.
That is, the first type photovoltaic module 11: the purpose is to meet the starting voltage of the inverter, and the one-to-many shut-down devices 12 of these photovoltaic modules are also a way of using the main loop current detection. In short, when the inverter starts to operate, because the inverter needs a starting voltage, the one-to-many turn-off devices 12 receive a current signal when the inverter starts to operate, and then synchronously turn on the plurality of first-type photovoltaic modules 11 connected in parallel with the inverter, at this time, because the plurality of first-type photovoltaic modules 11 are turned on, the operating voltage can be provided for the inverter, and then the main loop voltage of the photovoltaic power generation system reaches the operating voltage of the inverter, after the inverter normally operates, the automatic turn-on/off device 22 of the second-type photovoltaic module 21 continuously detects the main loop current, and the second-type photovoltaic modules 21 are sequentially connected into the main loop.
Therefore, the one-to-many switching-on/off device 12 is used for synchronously controlling the plurality of first-type photovoltaic assemblies 11 to be connected into the main loop to provide working voltage for the inverter module 3, and the situation that when the inverter is started, the number of the first-to-many photovoltaic assemblies is too small, the voltage cannot reach the starting voltage of the inverter, the inverter cannot normally work, the main loop is disconnected, and the current is interrupted can be effectively avoided. And furthermore, the time of each photovoltaic module accessing the main loop is further ensured to be consistent, so that the normal operation of the photovoltaic power generation system is ensured.
Referring to fig. 2, the present invention provides a simplified circuit diagram of an automatic on/off control device.
As an example, the automatically controlled on-off device comprises: a voltage conversion module 220, a microcontroller 221, a switching device 222 and a current collection module 223; the voltage conversion module 220 is connected to the second type of photovoltaic module 21, and is configured to convert a high voltage output by the second type of photovoltaic module 21 into a low voltage; the other end of the voltage conversion module 220 is connected to one end of the microcontroller 221, so as to supply power to the microcontroller 221; one end of the current collection module 223 is connected with one end of the microcontroller 221, so as to control the microcontroller 221 to work; the other end of the microcontroller 221 is connected to the control end of the switching device 222 for controlling the on/off of the switching device 222.
Optionally, the automatic control on-off device 22 further includes a diode device D; one end of the diode device D is connected to the second pole of the switch device 222, and the other end of the diode device D is connected to one end of the second type photovoltaic module 21; the diode device D is configured to circulate a main loop current from the diode device D when the switching device 222 is turned off.
Optionally, the switching device includes one of a MOS transistor, an IGBT, a thyristor, a triode, and a relay.
Optionally, taking the example that the switching device 222 includes an MOS transistor, when the MOS transistor is turned on, a current in the main circuit flows through the MOS transistor, and at this time, the bypass diode D is in a cut-off state, and when the MOS transistor is turned off, a current in the main circuit flows through the bypass diode D, and at this time, the main circuit in the photovoltaic power generation system is not disconnected.
As an example, OUT + and OUT-can be the output terminals of the automatically controlled on-off device 22, and can also be the input terminals of the main loop current when in use. That is, after the inverter and the photovoltaic module of the active control portion are opened, the main loop of the whole photovoltaic power generation system is already conducted, and the photovoltaic power generation system is in a normal working state, current can be generated in the main loop at this time, and even if the second type of photovoltaic module which needs to detect the current of the main loop automatically is not connected to the main loop, the current of the main loop can also flow from the bypass diode D of the on-off device.
In short, the starting mode of the whole photovoltaic power generation system is as follows: starting an inverter; when the first-class photovoltaic modules detect the current of the main loop, a multi-split turn-off control system instructs the first-class photovoltaic modules to be simultaneously connected into the main loop, and the voltage of the main loop reaches the working voltage of the inverter; after the inverter normally works, the automatic on-off device of the second type of photovoltaic modules continuously detects the current of the main loop, and the second type of photovoltaic modules are connected into the main loop, so that the photovoltaic power generation system normally works.
The above description is only for the embodiments of the present invention, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein too much, and those skilled in the art will know all the common technical knowledge in the technical field of the present invention before the application date or the priority date, can know all the prior art in this field, and have the ability to apply the conventional experimental means before this date, and those skilled in the art can combine their own ability to perfect and implement the schemes, and some typical known structures or known methods should not become obstacles for those skilled in the art to implement the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be defined by the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (6)
1. A photovoltaic power generation system is characterized by comprising a first type photovoltaic module, one or more second type photovoltaic modules and a photovoltaic inversion module, wherein two ends of the first type photovoltaic module and the second type photovoltaic module are connected with the photovoltaic inversion module;
the first-class photovoltaic module comprises at least two first-class photovoltaic components and one-to-many on-off device and is suitable for providing starting voltage for the photovoltaic inverter module;
the at least two first-type photovoltaic assemblies are connected to the one-to-many on-off device in parallel;
the second type photovoltaic module comprises a second type photovoltaic assembly and an automatic control on-off device connected in series with the second type photovoltaic assembly;
the photovoltaic inversion module is suitable for enabling the photovoltaic inversion module to start working based on the starting voltage provided by the first type of photovoltaic module, and electricity generated by the second type of photovoltaic module is merged into a power grid;
the first type of photovoltaic module and the second type of photovoltaic module are connected in series.
2. The photovoltaic power generation system of claim 1, wherein the number of photovoltaic modules of the first type is based on meeting a starting voltage of an inverter.
3. The photovoltaic power generation system of claim 1, wherein the one-to-many switching device is adapted to control the at least two first-type photovoltaic modules to be synchronously connected to the main loop of the photovoltaic power generation system.
4. The photovoltaic power generation system of claim 1, wherein the automatically controlled on-off device comprises:
the device comprises a voltage conversion module, a microcontroller, a switching device and a current acquisition module;
the voltage conversion module is connected with the second type of photovoltaic module and used for converting high voltage output by the second type of photovoltaic module into low voltage;
the other end of the voltage conversion module is connected with one end of the microcontroller and used for supplying power to the microcontroller;
one end of the current acquisition module is connected with one end of the microcontroller and used for controlling the microcontroller to work;
the other end of the microcontroller is connected with the control end of the switch device and used for controlling the on-off of the switch device.
5. The photovoltaic power generation system of claim 4, wherein the automatically controlled on-off device further comprises a diode device;
one end of the diode device is connected with the second pole of the switch device, and the other end of the diode device is connected with one end of the second type of photovoltaic module;
the diode device is configured to pass a primary loop current therethrough when the switching device is closed.
6. The photovoltaic power generation system of claim 4, wherein the switching device comprises one of a MOS transistor, an IGBT, a thyristor, a triode, and a relay.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222689591.0U CN218733282U (en) | 2022-10-12 | 2022-10-12 | Photovoltaic power generation system |
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| CN202222689591.0U CN218733282U (en) | 2022-10-12 | 2022-10-12 | Photovoltaic power generation system |
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| CN218733282U true CN218733282U (en) | 2023-03-24 |
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