CN218335343U - Photovoltaic power generation grid-connected system with current stabilization function - Google Patents

Photovoltaic power generation grid-connected system with current stabilization function Download PDF

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CN218335343U
CN218335343U CN202222488814.7U CN202222488814U CN218335343U CN 218335343 U CN218335343 U CN 218335343U CN 202222488814 U CN202222488814 U CN 202222488814U CN 218335343 U CN218335343 U CN 218335343U
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power generation
grid
current
photovoltaic power
super capacitor
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Shenzhen Hongyuan Bode New Energy Technology Development Co ltd
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

The utility model provides a photovoltaic power generation grid-connected system that possesses stationary flow function increases and uses super capacitor module, DC converter and stationary flow controller to be the stationary flow control system that core element constitutes, utilizes super capacitor module not to start the requirement, as long as there is the characteristic that electric energy input just can keep the charged state, therefore can collect weak electric energy, rethread stationary flow controller automatic control electric energy absorption and release adjust photovoltaic power generation's output curve, make the output curve mild. The photovoltaic panel can collect and store weak electric energy generated by the solar photovoltaic panel under the condition of weak illumination, and can smooth a photovoltaic power generation curve. The photovoltaic power generation efficiency can be improved, the output power of photovoltaic power generation is stabilized, the cycle life of an energy storage system is prolonged, and the stability of a photovoltaic power generation system is improved, so that the electric energy output to a power grid is in a stable state, and the impact and fluctuation of the power grid are reduced.

Description

Photovoltaic power generation grid-connected system with current stabilization function
Technical Field
The utility model relates to a photovoltaic power generation technical field especially relates to a photovoltaic power generation grid-connected system who possesses stationary flow function.
Background
Energy is an important material basis for the existence and development of human society, and the energy is gradually reduced along with the development of the society. Therefore, the scale of new energy is steadily enlarged, and meanwhile, safe and stable operation, new energy consumption and new energy output of a high-proportion new energy power generation access power system face huge challenges. Solar energy is rapidly developed as one of important new energy sources by virtue of inexhaustible energy, no pollution and the like. With the rapid development of photovoltaic power generation technology, photovoltaic power generation systems are widely popularized in various countries around the world, and the systems tend to mature from small-sized photovoltaic power generation systems which are mainly self-supplied and self-sufficient for families to grid-connected photovoltaic power generation systems which are connected with a power supply network and transmit power to the power grid.
Solar energy has the defects of intermittency, instability, uncontrollable property and the like, and is an energy source influenced by changes of climate, time and the like. Due to the change of illumination intensity, the output power of the solar photovoltaic panel fluctuates, the photovoltaic output lacks controllability, the power supply is unstable, the fluctuation of a power generation curve is large, the stability of a photovoltaic grid-connected system, the photovoltaic power generation absorption and the photovoltaic power station electric energy quality are directly influenced, the power grid regulation burden is increased, the power grid instability can be seriously caused, and the electric power safety is influenced.
The solar photovoltaic panel is a semiconductor device for converting light energy into electric energy, and the electric energy output by the solar photovoltaic panel is influenced by various factors such as illumination intensity, illumination angle, temperature and the like, so that the power generation power of the solar photovoltaic panel dynamically changes in a wide range, as shown in fig. 1, a schematic diagram of the solar photovoltaic panel for charging an energy storage system (such as a storage battery) is shown, and a shaded area a in fig. 1 represents a normal charging range of the energy storage system. Under the normal illumination condition, the on-load voltage is higher than the real-time voltage of the energy storage system, and the energy storage system can be charged in real time until the on-load voltage is full of the energy storage system. Under the condition of weak illumination such as early morning, evening, rainy day and night, the output capacity of the solar photovoltaic panel is reduced, so that the on-load voltage is equal to or lower than the real-time voltage of the energy storage system, and under the condition, the conventional photovoltaic power generation system cannot charge the energy storage system, so that the electric energy generated by the solar photovoltaic panel under the condition of weak illumination is wasted.
The photovoltaic output fluctuates and periodically changes along with the short-term illumination, so that the original power and energy balance of the system is broken, the voltage and frequency fluctuation of the system is easily caused, the stability of the system is damaged, and the photovoltaic output is a main obstacle for high-proportion new energy consumption. Meanwhile, the proportion of new energy resources characterized by low inertia and weak support in the power grid is increased continuously, and potential safety hazards are brought to the stable operation of the power grid. On one hand, the voltage instability risk of an alternating current and direct current hybrid receiving end power grid is increased, outstanding transient stability or dynamic stability problems still exist in large power base delivery, inter-area alternating current and direct current connection power grids and local weak networking areas, on the other hand, the primary and secondary frequency modulation capability is reduced due to new energy and direct current, and the difficulty of frequency control is increased. When the power grid fails or is disturbed, large-scale off-grid is easily caused, and the stability of the system is further deteriorated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a photovoltaic power generation grid-connected system that possesses stationary flow function can improve photovoltaic power generation efficiency, stabilizes photovoltaic power generation's output, prolongs energy storage system cycle life, improves photovoltaic power generation system's stability to make the electric energy of exporting the electric wire netting be in more steady state, reduce the electric wire netting and strike and undulant.
In order to achieve the purpose, the utility model provides a photovoltaic power generation grid-connected system with current stabilization function, which comprises a solar photovoltaic panel, a MPPT controller, a super capacitor module, a DC/DC converter, a current stabilization controller, an energy storage system, an inverter and a power grid;
the solar photovoltaic panel, the MPPT controller, the super capacitor module and the DC/DC converter are all electrically connected with the current stabilizing controller, the solar photovoltaic panel is electrically connected with the MPPT controller, the super capacitor module and the energy storage system are both electrically connected with the DC/DC converter, the inverter is electrically connected with the MPPT controller, and the power grid is electrically connected with the inverter;
the solar photovoltaic panel is used for converting solar energy into electric energy and outputting the electric energy as direct current;
the super capacitor module is discharged to the energy storage system through the DC/DC converter after being fully charged;
the solar photovoltaic panel transmits the output direct current to the inverter through the MPPT controller, and the inverter is used for converting the direct current into alternating current and transmitting the alternating current to a power grid.
The solar photovoltaic panel is electrically connected with the MPPT controller and the current stabilization controller through a direct current surge protector, and the direct current surge protector is used for absorbing surge energy and preventing lightning.
The inverter is electrically connected with a power grid through a transformer.
The inverter is electrically connected with the alternating current load, and the inverter is also used for converting the direct current into alternating current and then transmitting the alternating current to the alternating current load so as to supply power to the alternating current load.
The super capacitor module comprises a plurality of super capacitors.
The DC/DC converter is a buck-boost type bidirectional DC/DC converter.
The energy storage system is electrically connected with the direct current load to supply power to the direct current load.
The energy storage system includes a battery.
The energy storage system is electrically connected with the battery management system.
The utility model has the advantages that: the utility model discloses a photovoltaic power generation grid-connected system who possesses stationary flow function increases and uses the super capacitor module, DC converter and stationary flow controller are the stationary flow control system that core element constitutes, utilize the super capacitor module not to have the start-up requirement, as long as there is the characteristic that electric energy input just can keep charged state, therefore can collect weak electric energy, rethread stationary flow controller automatic control electric energy absorption and release adjust photovoltaic power generation's output curve, make output curve mild. The photovoltaic panel can collect and store weak electric energy generated by the solar photovoltaic panel under the condition of weak illumination, and can smooth a photovoltaic power generation curve. The photovoltaic power generation efficiency can be improved, the output power of photovoltaic power generation is stabilized, the cycle life of an energy storage system is prolonged, and the stability of a photovoltaic power generation system is improved, so that the electric energy output to a power grid is in a stable state, and the impact and fluctuation of the power grid are reduced.
Drawings
For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the present invention and accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a prior art solar photovoltaic panel charging an energy storage system;
fig. 2 is a block diagram of the photovoltaic power generation grid-connected system with a current stabilizing function according to the present invention;
fig. 3 is a schematic circuit diagram of a current regulator implementing a control process according to a preferred embodiment of the present invention;
FIG. 4 is a graph of photovoltaic power generation amount monitored in 6, 5 and 6 months in 2022 by the photovoltaic project of 666 in the Shenzhen Longsentan Ainanlu in Shenzhen City;
fig. 5 is a graph of the photovoltaic power generation amount corresponding to fig. 4 after adding a current stabilization control system composed of a super capacitor module, a DC/DC converter and a current stabilization controller as core elements;
fig. 6 is a schematic diagram of the solar photovoltaic panel of the present invention charging the super capacitor module.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 2, the utility model provides a photovoltaic Power generation grid-connected system with current stabilization function, including solar photovoltaic board 1, MPPT controller (Maximum Power Point Tracking, maximum Power Point Tracking solar controller) 2, super capacitor module 3, DC/DC converter 4, current stabilization controller 5, energy storage system 6, inverter 9, and electric wire netting 12.
Solar photovoltaic board 1, MPPT controller 2, super capacitor module 3, and DC/DC converter 4 all with stationary flow controller 5 electric connection, solar photovoltaic board 1 and MPPT controller 2 electric connection, super capacitor module 3 and energy storage system 6 all with DC/DC converter 4 electric connection, inverter 9 and MPPT controller 2 electric connection, electric wire netting 12 and inverter 9 electric connection.
The solar photovoltaic panel 1 is used for converting solar energy into electric energy and outputting the electric energy as direct current.
The current stabilization controller 5 is used for detecting the total voltage of the direct current output by the solar photovoltaic panel 1 in real time, and controlling the solar photovoltaic panel 1 to charge the super capacitor module 3 when the total voltage is smaller than a preset voltage value, and the super capacitor module 3 is discharged to the energy storage system 6 through the DC/DC converter 4 after being fully charged; and when the total voltage is greater than or equal to the preset voltage value, the current stabilizing controller 5 detects the total current of the direct current output by the solar photovoltaic panel 1, so as to obtain the total output power of the solar photovoltaic panel 1.
The steady-current controller 5 is also used for controlling the solar photovoltaic panel 1 to transmit the output direct current to an inverter 9 through the MPPT controller 2 when the total output power is greater than or equal to a preset power value, and the inverter 9 is used for converting the direct current into alternating current and transmitting the alternating current to a power grid 12; the current stabilization controller 5 is also used for simultaneously controlling the solar photovoltaic panel 1 to charge the super capacitor module 3, and the super capacitor module 3 is discharged to the energy storage system 6 through the DC/DC converter 4 after being fully charged.
The current stabilizing controller 5 is further configured to detect the electric quantity of the super capacitor module 3 when the total output power is smaller than a preset power value, and control the energy storage system 6 to discharge electricity to the MPPT controller 2 through the DC/DC converter 4 when the electric quantity is smaller than the preset value so as to compensate for the deficiency of the generated energy of the solar photovoltaic panel 1, so that the solar photovoltaic panel 1 transmits the output direct current to the inverter 9 through the MPPT controller 2; and when the electric quantity is larger than or equal to the preset value, the constant current controller 5 controls the super capacitor module 3 to discharge electricity to the MPPT controller 2 through the DC/DC converter 4 so as to compensate the deficiency of the electricity generation quantity of the solar photovoltaic panel 1, and therefore the solar photovoltaic panel 1 transmits the output direct current to the inverter 9 through the MPPT controller 2.
Specifically, the solar photovoltaic panel 1 is electrically connected with the MPPT controller 2 and the current stabilization controller 5 through a direct current surge protector 8, and the direct current surge protector 8 is used for absorbing surge energy and preventing lightning.
Specifically, the inverter 9 is electrically connected to a power grid 12 through a transformer 11.
Specifically, the inverter 9 is electrically connected to the ac load 10, and the inverter 9 is further configured to convert the direct current into the alternating current and transmit the alternating current to the ac load 10, so as to supply power to the ac load 10.
Specifically, the super capacitor module 3 includes a plurality of super capacitors.
Specifically, the DC/DC converter 4 is a buck-boost type bidirectional DC/DC converter.
Specifically, the energy storage system 6 is electrically connected to the dc load 13 to supply power to the dc load 13.
In particular, the energy storage system 6 comprises a battery.
Further, the energy storage system 6 is electrically connected to a Battery Management System (BMS) 14, and the battery management system 14 can intelligently manage and maintain the battery, prevent the battery from being overcharged and overdischarged, prolong the service life of the battery, and monitor the state of the battery.
Specifically, the preset voltage value is 200V, and the preset value is 10% of the electric quantity of the super capacitor module 3.
As shown in fig. 3, for the utility model discloses a current regulator 5 of a preferred embodiment realizes the schematic circuit diagram of control process (super capacitor module 3 in fig. 3 has only illustrated a super capacitor), current regulator 5 control switch K2 is closed, and switch K1, K3 and K4 break off, and control solar photovoltaic board 1 charges for super capacitor module 3. And when the total output power is greater than or equal to a preset power value, the current stabilization controller 5 controls the switches K2 and K4 to be closed, the switches K1 and K3 to be disconnected, controls the solar photovoltaic panel 1 to transmit electric energy to the inverter 9 through the MPPT controller 2, and simultaneously charges the super capacitor module 3 for the solar photovoltaic panel 1. And the current stabilizing controller 5 controls the switches K1 and K4 to be closed, switches K2 and K3 to be opened, and controls the energy storage system 6 to discharge to the MPPT controller 2 through the DC/DC converter 4. And when the total output power is less than a preset power value, the current stabilizing controller 5 controls the switches K1, K3 and K4 to be closed, the switch K2 to be opened, and controls the super capacitor module 3 to discharge to the MPPT controller 2 through the DC/DC converter 4.
The utility model discloses use super capacitor module, DC converter and current stabilization controller as core element, constitute the current stabilization control system, super capacitor module does not have the start-up requirement, as long as there is the electric energy input just can keep charged state and store the electric energy, so can collect the electric energy under the weak light condition. Under the condition of weak illumination (namely when the total output voltage of the solar photovoltaic panel is smaller than a preset voltage value), the solar photovoltaic panel charges the super capacitor module, and the super capacitor module is discharged to the energy storage system through the DC/DC converter after being fully charged. Under normal illumination conditions (namely when the total output voltage of the solar photovoltaic panel is greater than or equal to a preset voltage value), if the total output power of the solar photovoltaic panel is greater than or equal to a preset power value, except that the MPPT controller converts the electric energy output by the solar photovoltaic panel into alternating current through an inverter, the alternating current can be directly connected with an alternating current load for users to use the electricity, or a transformer is connected to transmit the electric energy to a power grid; and the redundant electric energy is stored in the super capacitor module. If the total power output by the solar photovoltaic panel is smaller than the preset power value, the total power is discharged to the MPPT controller through the super capacitor module or the energy storage system, so that the output power of the solar photovoltaic panel is compensated, the power generation curve of the solar photovoltaic panel is smooth, and rapid falling and rising are avoided.
The utility model discloses an among the photovoltaic power generation grid-connected system who possesses the stationary flow function, most electric energy that solar photovoltaic board conversion solar energy obtained all merges into the electric wire netting through the MPPT controller in, the super capacitor module is deposited in to the small part electric energy, and deposit in energy storage system after the super capacitor module is full of the electricity, when the solar photovoltaic board generated energy is not enough, super capacitor module and energy storage system all can discharge and give the MPPT controller, make the electric energy of exporting the electric wire netting be in more steady state, and energy storage system also can directly be the power supply of direct current load.
As shown in fig. 4, a graph of the photovoltaic power generation amount monitored in 6, 5 and 2022 by the photovoltaic project of 666 # in dragon hillock region in Shenzhen (the horizontal axis represents the time and the vertical axis represents the power). This photovoltaic project capacity is 110KW, and average daily generated energy is 380 degrees electricity, and prediction peak power (power peak) is 100KW, and the power generation time of power range between 90KW-100KW is about 2 hours, because influence such as weather factor, this electricity generation curve is jagged parabola.
And the utility model discloses increase behind the stationary flow control system who constitutes for the core element with super capacitor module, DC converter and stationary flow controller, the photovoltaic generated energy curve graph of this photovoltaic project is shown as figure 5, to this photovoltaic project, it is 90KW to predetermine the power value. The preset power value is different for different photovoltaic power generation system items and is determined according to actual conditions. After the super-capacitor module, the DC/DC converter, the current stabilizing controller and other elements are added into the photovoltaic power generation system, weak electric energy generated by the solar photovoltaic panel under the weak illumination conditions of morning, evening, rainy day, night and the like can be collected and stored, and the photovoltaic power generation curve is smoother. Test records of multiple experiments show that the photovoltaic power generation efficiency can be improved by 10-20%. As shown in fig. 6, a schematic diagram of the solar photovoltaic panel charging the super capacitor module is shown, and a shaded area B in fig. 6 represents a new range of collectable electric energy compared to fig. 1.
To sum up, the utility model provides a pair of photovoltaic power generation grid-connected system that possesses stationary flow function increases the stationary flow control system who constitutes for core element with super capacitor module, DC/DC converter and stationary flow controller, utilizes super capacitor module not to start the requirement, as long as there is the characteristic that electric energy input just can keep the charged state, therefore can collect weak electric energy, and rethread stationary flow controller automatic control electric energy absorbs and releases, adjusts photovoltaic power generation's output curve, makes output curve mild. The photovoltaic panel can collect and store weak electric energy generated by the solar photovoltaic panel under the condition of weak illumination, and can smooth a photovoltaic power generation curve. The photovoltaic power generation efficiency can be improved, the output power of photovoltaic power generation is stabilized, the cycle life of an energy storage system is prolonged, and the stability of a photovoltaic power generation system is improved, so that the electric energy output to a power grid is in a stable state, and the impact and fluctuation of the power grid are reduced.
From the above, it is obvious to those skilled in the art that various other changes and modifications can be made according to the technical solution and the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the appended claims.

Claims (9)

1. A photovoltaic power generation grid-connected system with a current stabilization function is characterized by comprising a solar photovoltaic panel (1), an MPPT controller (2), a super capacitor module (3), a DC/DC converter (4), a current stabilization controller (5), an energy storage system (6), an inverter (9) and a power grid (12);
the solar photovoltaic panel (1), the MPPT controller (2), the super capacitor module (3) and the DC/DC converter (4) are electrically connected with the steady flow controller (5), the solar photovoltaic panel (1) is electrically connected with the MPPT controller (2), the super capacitor module (3) and the energy storage system (6) are electrically connected with the DC/DC converter (4), the inverter (9) is electrically connected with the MPPT controller (2), and the power grid (12) is electrically connected with the inverter (9);
the solar photovoltaic panel (1) is used for converting solar energy into electric energy and outputting the electric energy in a direct current manner;
the super capacitor module (3) is discharged to an energy storage system (6) through a DC/DC converter (4) after being fully charged;
the solar photovoltaic panel (1) transmits the output direct current to an inverter (9) through an MPPT controller (2), and the inverter (9) is used for converting the direct current into alternating current and transmitting the alternating current to a power grid (12).
2. The grid-connected photovoltaic power generation system with the current stabilizing function as claimed in claim 1, wherein the solar photovoltaic panel (1) is electrically connected to the MPPT controller (2) and the current stabilizing controller (5) through a dc surge protector (8), and the dc surge protector (8) is used for absorbing surge energy and preventing lightning.
3. The grid-connected photovoltaic power generation system with the current stabilizing function as claimed in claim 1, wherein the inverter (9) is electrically connected with a power grid (12) through a transformer (11).
4. The grid-connected photovoltaic system with the current stabilizing function according to claim 1, wherein the inverter (9) is electrically connected to an ac load (10), and the inverter (9) is further configured to convert a direct current into an alternating current and transmit the alternating current to the ac load (10) so as to supply power to the ac load (10).
5. The grid-connected photovoltaic power generation system with the current stabilizing function as claimed in claim 1, wherein the super capacitor module (3) comprises a plurality of super capacitors.
6. The grid-connected photovoltaic power generation system with the current stabilizing function according to claim 1, wherein the DC/DC converter (4) is a buck-boost bidirectional DC/DC converter.
7. The grid-connected photovoltaic power generation system with the current stabilizing function as claimed in claim 1, wherein the energy storage system (6) is electrically connected with a direct current load (13) to supply power to the direct current load (13).
8. A grid-connected photovoltaic power generation system with current stabilization as claimed in claim 1, characterized in that the energy storage system (6) comprises a storage battery.
9. The grid-connected photovoltaic power generation system with the current stabilizing function as claimed in claim 8, wherein the energy storage system (6) is electrically connected with a battery management system (14).
CN202222488814.7U 2022-09-20 2022-09-20 Photovoltaic power generation grid-connected system with current stabilization function Active CN218335343U (en)

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CN202222488814.7U CN218335343U (en) 2022-09-20 2022-09-20 Photovoltaic power generation grid-connected system with current stabilization function

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