CN221202214U - Photovoltaic energy storage device based on MPPT control - Google Patents
Photovoltaic energy storage device based on MPPT control Download PDFInfo
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- CN221202214U CN221202214U CN202322722802.0U CN202322722802U CN221202214U CN 221202214 U CN221202214 U CN 221202214U CN 202322722802 U CN202322722802 U CN 202322722802U CN 221202214 U CN221202214 U CN 221202214U
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Abstract
The utility model relates to the technical field of photovoltaic systems, in particular to a photovoltaic energy storage device based on MPPT (maximum power point tracking) control, which comprises a photovoltaic module and a direct current load, wherein the photovoltaic module comprises a photovoltaic array, a photovoltaic energy storage battery and a direct current conversion module, the photovoltaic array is electrically connected with the photovoltaic energy storage battery through the direct current conversion module, the photovoltaic energy storage device further comprises an MPPT control module, a PWM (pulse-Width modulation) controller, a boost circuit and a buck circuit, the photovoltaic module is respectively connected with the direct current load through the boost circuit and the buck circuit, the output end of the photovoltaic module is also connected to the input end of the MPPT control module, the output end of the MPPT control module is connected with the input end of the PWM controller, and the output end of the PWM controller is respectively connected with the boost circuit and the buck circuit. The maximum output power point of the photovoltaic energy storage power generation can be tracked, the control accuracy is improved, the output power of the photovoltaic energy storage device is increased, and the photovoltaic energy storage power generation efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of photovoltaic systems, in particular to a photovoltaic energy storage device based on MPPT control.
Background
Solar energy has received increasing attention as a primary option in the energy storage and power generation field. However, in practical application, the working environment where the photovoltaic system is located is an important factor affecting the energy storage and power generation efficiency of the whole photovoltaic system, the energy storage and power generation of the photovoltaic system can follow the changes of conditions such as sunlight, temperature and the like, and the output power of the photovoltaic system is also continuously changed, for example, the photovoltaic system is shielded by partial buildings and trees to generate partial shadow in the working process, so that the photovoltaic system generates power to generate a multimodal phenomenon, the power generation output power is reduced, and the power supply electric energy is unstable; and the photovoltaic system is influenced by sunlight, the generated output power of the photovoltaic system is obviously higher than the power consumption of a load, the supply and demand relation is unbalanced, and the phenomena of electric energy waste and the like are caused.
Disclosure of utility model
In order to solve the problems, the utility model provides a photovoltaic energy storage device based on MPPT control.
The technical scheme is as follows:
The utility model provides a photovoltaic energy storage device based on MPPT control, includes photovoltaic module and direct current load, photovoltaic module includes photovoltaic array, photovoltaic energy storage battery and direct current conversion module, photovoltaic array passes through direct current conversion module and is connected with photovoltaic energy storage battery electricity, still includes MPPT control module, PWM controller, boost circuit and buck circuit, photovoltaic module is connected with direct current load through boost circuit and buck circuit respectively, photovoltaic module output still is connected to MPPT control module input, PWM controller input is connected to MPPT control module output, boost circuit and buck circuit are connected respectively to PWM controller output.
The MPPT control module comprises a power point tracking module, a current sampling circuit, a voltage sampling circuit, an AD conversion circuit and a main control unit, wherein the current sampling circuit and the voltage sampling circuit are connected with the power point tracking module through the AD conversion circuit, and the power point tracking module is connected with the main control unit.
As a specific implementation manner, the MPPT control module is electrically connected with an input end of the dc load.
The MPPT control module is connected to the positive electrode of the output end of the photovoltaic module and the positive electrode of the input end of the direct current load respectively through a current transformer.
The boost circuit comprises a MOSFET switch tube, a capacitor C1, a capacitor C2, a diode D1 and an inductor L1, wherein the capacitor C1 is connected with the anode and the cathode of the photovoltaic module, one end of the inductor L1 is electrically connected with the anode of the photovoltaic module and one end of the capacitor C1, the other end of the inductor L1 is electrically connected with one end of the capacitor C2 through the diode D1, a serial node of the inductor L1 and the diode D1 is connected with the source electrode of the MOSFET switch tube, the drain electrode of the MOSFET switch tube is grounded, and the capacitor C2 is connected with the anode and the cathode of a direct current load.
As a specific implementation mode, the output end of the PWM controller is connected with the gate of the MOSFET switch tube of the boost circuit.
The main control unit model is an STM32F103C6T6 chip.
In order to realize that the photovoltaic energy storage battery stores electric energy, the photovoltaic energy storage device further comprises a battery management system, and the battery management system is electrically connected with the photovoltaic energy storage battery.
And the battery management system is in communication connection with the MPPT control module.
The direct current load is also connected with a circuit breaking protector, and can carry out direct current protection on electric equipment at the direct current load side.
The beneficial effects are that: the utility model relates to a photovoltaic energy storage device based on MPPT control, which can track the maximum output power point of photovoltaic energy storage power generation through an MPPT control module, regulate a duty ratio to control a PWM controller to drive and adjust a boost circuit, improve the control accuracy, realize the increase of the output power of the photovoltaic energy storage device, improve the photovoltaic energy storage power generation efficiency and ensure the stability of energy storage power generation; meanwhile, the MPPT control module can also collect electric signals of input power at the direct current load side, determine the power consumption value of the direct current load, and balance the supply and demand relation of photovoltaic energy storage power generation through voltage reduction adjustment of the buck circuit, so that electric energy waste is avoided.
Drawings
FIG. 1 is a block diagram of a photovoltaic energy storage device based on MPPT control;
fig. 2 is a schematic structural diagram of an MPPT control module;
fig. 3 is a block diagram of a boost circuit and a buck circuit.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.
Examples
Referring to fig. 1, the embodiment provides a photovoltaic energy storage device based on MPPT control, which includes a photovoltaic module, a dc load, an MPPT (Maximum Power Point Tracking ) control module, a PWM (Pulse width modulation wave, pulse width modulation) controller, a boost circuit and a buck circuit, wherein the photovoltaic module includes a photovoltaic array, a photovoltaic energy storage battery and a dc conversion module, and the photovoltaic array is electrically connected with the photovoltaic energy storage battery through the dc conversion module, so that the photovoltaic energy storage battery can be charged by converting light energy into electric energy.
When the photovoltaic energy storage battery is used for energy storage and power generation, the photovoltaic module is connected with the direct current load through the boost circuit and the buck circuit respectively, so that the output voltage of the photovoltaic module can be boosted through the boost circuit or reduced through the buck circuit, and the power supply requirement of the direct current load is met. The photovoltaic energy storage device adopts a boost circuit, so that the phenomenon of output power interruption can be avoided, and the reliability of power supply is provided; when the output power of the photovoltaic module is affected by local shielding to reduce the power generated by the photovoltaic energy storage battery, the boost circuit can receive a control signal to improve the output power transmitted from the energy storage power generation to the direct current load.
When the output power of the photovoltaic module of the photovoltaic energy storage device is too high, the buck circuit can receive a control signal to reduce the output power transmitted from the energy storage power generation to the direct current load, and control the photovoltaic energy storage battery to store the redundant electric energy.
And a circuit breaking protector is further arranged between the direct current load and the boost circuit and between the direct current load and the buck circuit, so that direct current protection can be carried out on electric equipment at the direct current load side, and equipment damage caused by abnormal output power of the photovoltaic module is prevented.
In order to realize carrying out real-time tracking to the power generation output power of photovoltaic energy storage battery, MPPT control module input is connected photovoltaic module's output, and its input is connected with direct current load's input electricity simultaneously for realize carrying out the electrical signal to photovoltaic module's output and direct current load's input and gather, MPPT control module can carry out duty cycle according to the electrical signal that gathers and adjust, PWM controller input is connected to MPPT control module output to carry out pulse control signal's adjustment with duty cycle signal transmission to PWM controller.
Referring to fig. 2, the MPPT control module includes a power point tracking module, a current sampling circuit, a voltage sampling circuit, an AD conversion circuit, and a main control unit, where the model of the main control unit is an STM32F103C6T6 chip. The current sampling circuit and the voltage sampling circuit are connected with the power point tracking module through the AD conversion circuit, the input end of the current sampling circuit is respectively connected to the positive electrode of the output end of the photovoltaic module and the positive electrode of the input end of the direct current load through the current transformer, current signal acquisition is carried out through the current transformer, and current sampling is carried out through the current sampling circuit; the voltage sampling circuit is respectively connected to an output line of the photovoltaic module and an input line of the direct current load for voltage signal sampling. The current sampling circuit and the voltage sampling circuit convert electric signals into digital signals through the AD conversion circuit and transmit the digital signals to the power point tracking module for processing, the power point tracking module is connected with the main control unit, the power point tracking module can track the maximum output power point of the photovoltaic energy storage battery in real time, and the main control unit adjusts the duty ratio according to the maximum output power point and transmits the duty ratio signals to the PWM controller.
The output end of the PWM controller is respectively connected with the boost circuit and the buck circuit, and after receiving the duty ratio signal of the MPPT control module, the PWM controller generates a control signal to drive the boost circuit or the buck circuit to adjust the output power of the photovoltaic module. As shown in fig. 3, the boost circuit includes a MOSFET switch tube, a capacitor C1, a capacitor C2, a diode D1, and an inductor L1, where the capacitor C1 is connected to the anode and the cathode of the photovoltaic module, and is capable of performing filtering processing on the output current of the photovoltaic module; one end of the inductor L1 is electrically connected with the anode of the photovoltaic module and one end of the capacitor C1, the other end of the inductor L1 is electrically connected with one end of the capacitor C2 through the diode D1, a node connected in series with the inductor L1 and the diode D1 is connected with the source electrode of the MOSFET switch tube, and the diode D1 can protect a boost circuit and prevent electric energy recharging at the DC load side; and the drain electrode of the MOSFET is grounded, and the capacitor C2 is connected with the anode and the cathode of the direct current load. The grid electrode of the MOSFET switch tube is electrically connected with the output end of the PWM controller, the PWM controller generates a pulse control signal after receiving the duty ratio signal and transmits the control signal to the MOSFET switch tube, and the output power is adjusted by adjusting the working voltage of the capacitor between the grid electrode and between the grid electrode and the source electrode so that the output power of the photovoltaic energy storage battery is kept at a maximum power point.
Similarly, the buck circuit comprises a MOSFET switch tube, a capacitor C3, a capacitor C4, an inductor L2 and a diode D2, wherein the capacitor C3 is connected with the anode and the cathode of the photovoltaic module, the MOSFET switch tube is arranged in the buck circuit in series, the drain electrode of the MOSFET switch tube is connected with the anode of the photovoltaic module and the connection point of the capacitor C3, the source electrode of the MOSFET switch tube is sequentially connected with the inductor L2 and the capacitor C4, the capacitor C4 is connected with the anode and the cathode of a direct-current load, one end of the diode D2 is connected with the source electrode of the MOSFET switch tube, and the other end of the diode D2 is grounded. The MPPT control module is used for adjusting the duty ratio of a control signal of the PWM controller by sampling the direct current load input voltage, so that the on time and the off time of the MOSFET switch tube of the buck circuit are controlled, and the generated output power of the photovoltaic module is subjected to step-down adjustment.
In a specific embodiment, the photovoltaic energy storage device further comprises a battery management system, the battery management system is electrically connected with the photovoltaic energy storage battery, meanwhile, the battery management system is also in communication connection with the MPPT control module, when the MPPT control module samples electric signals of the photovoltaic module and the direct current load side respectively, the generated output power of the photovoltaic module is larger than the power input power of the direct current load side, the photovoltaic energy storage device is switched to the buck circuit by the boost circuit, the output power of the photovoltaic energy storage battery is subjected to voltage reduction adjustment to meet the power supply requirement of the direct current load, the MPPT control module sends an energy storage signal to the battery management system, and the battery management system controls the photovoltaic energy storage battery to store electric energy after receiving the energy storage signal, so that electric energy waste is reduced.
Claims (10)
1. The utility model provides a photovoltaic energy storage device based on MPPT control, includes photovoltaic module and direct current load, photovoltaic module includes photovoltaic array, photovoltaic energy storage battery and direct current conversion module, photovoltaic array passes through direct current conversion module and is connected with photovoltaic energy storage battery electricity, its characterized in that still includes MPPT control module, PWM controller, boost circuit and buck circuit, photovoltaic module is connected with direct current load through boost circuit and buck circuit respectively, photovoltaic module output still is connected to MPPT control module input, PWM controller input is connected to MPPT control module output, boost circuit and buck circuit are connected respectively to PWM controller output.
2. The photovoltaic energy storage device of claim 1, wherein the MPPT control module comprises a power point tracking module, a current sampling circuit, a voltage sampling circuit, an AD conversion circuit, and a master control unit, wherein the current sampling circuit and the voltage sampling circuit are connected to the power point tracking module via the AD conversion circuit, and the power point tracking module is connected to the master control unit.
3. The photovoltaic energy storage device of claim 1, wherein the MPPT control module is electrically connected to an input of a dc load.
4. The photovoltaic energy storage device of claim 3, wherein the MPPT control module is connected to the positive electrode of the photovoltaic module output and the positive electrode of the dc load input through current transformers, respectively.
5. The photovoltaic energy storage device of claim 1, wherein the boost circuit comprises a MOSFET switch tube, a capacitor C1, a capacitor C2, a diode D1 and an inductor L1, wherein the capacitor C1 is connected with the anode and the cathode of the photovoltaic module, one end of the inductor L1 is electrically connected with the anode of the photovoltaic module and one end of the capacitor C1, the other end of the inductor L1 is electrically connected with one end of the capacitor C2 through the diode D1, a serial connection node of the inductor L1 and the diode D1 is connected with the source electrode of the MOSFET switch tube, the drain electrode of the MOSFET switch tube is grounded, and the capacitor C2 is connected with the anode and the cathode of the direct current load.
6. The photovoltaic energy storage device of claim 5, wherein the PWM controller output is connected to the gate of a MOSFET switch tube of a boost circuit.
7. The photovoltaic energy storage device of claim 2, wherein the master control unit model is an STM32F103C6T6 chip.
8. The photovoltaic energy storage device of claim 1, further comprising a battery management system electrically connected to the photovoltaic energy storage cell.
9. The photovoltaic energy storage device of claim 8, wherein the battery management system is communicatively coupled to an MPPT control module.
10. The photovoltaic energy storage apparatus of claim 1 wherein the dc load is further connected with a circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322722802.0U CN221202214U (en) | 2023-10-11 | 2023-10-11 | Photovoltaic energy storage device based on MPPT control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322722802.0U CN221202214U (en) | 2023-10-11 | 2023-10-11 | Photovoltaic energy storage device based on MPPT control |
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| CN221202214U true CN221202214U (en) | 2024-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322722802.0U Active CN221202214U (en) | 2023-10-11 | 2023-10-11 | Photovoltaic energy storage device based on MPPT control |
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| CN (1) | CN221202214U (en) |
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2023
- 2023-10-11 CN CN202322722802.0U patent/CN221202214U/en active Active
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