A Photovoltaic DC Fresh Air Flexible Regulation System and Method

Abstract

The present invention provides a photovoltaic DC fresh air flexible regulation system and method. The photovoltaic DC fresh air flexible regulation system includes a photovoltaic module, an energy storage module, a control module, and a fresh air system. The photovoltaic module is connected to the energy storage module through a DC / DC module, the energy storage module is connected to the fresh air system, and the AC power grid is connected to the energy storage module and the fresh air system respectively through an AC / DC module. The control module is connected to the AC / DC module, the energy storage module, and the DC / DC module respectively. In the present invention, during the regulation process, with the power supply of the energy storage module as the core, only two power supply mode switches are required, which maximally ensures the stability of the fresh air system while considering the characteristics of photovoltaic power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic DC regulation, in particular to a flexible regulation system and method for photovoltaic DC fresh air. Background Art

[0002] The photovoltaic DC fresh air system mainly consists of a fresh air system, photovoltaic modules, a DC / DC module, an energy storage module, an AC / DC module, a processor, etc. The photovoltaic modules supply power to the fresh air system through the DC / DC module, the AC power grid supplies power to the fresh air system through the AC / DC module, and the energy storage module provides a backup power supply. The existing control method is that when the photovoltaic power generation meets the electricity demand, only the photovoltaic modules supply power to the fresh air system. When the photovoltaic power generation does not meet the electricity demand, the energy storage module or the AC power grid is used for supplementary power supply. During the power supply process, multiple power supply mode switches are required. However, the fresh air system needs to work continuously for 24 hours, and multiple power supply mode switches will have an adverse impact on the normal operation of the fresh air system and affect the service life of the equipment. Summary of the Invention

[0003] In order to solve the technical problem that multiple switches of the power supply mode in the prior art have an adverse impact on the normal operation of the fresh air system and affect the service life of the equipment, the flexible regulation system for photovoltaic DC fresh air proposed by the present invention includes photovoltaic modules, an energy storage module, a control module, and a fresh air system. The photovoltaic modules are connected to the energy storage module through a DC / DC module, the energy storage module is connected to the fresh air system, the AC power grid is respectively connected to the energy storage module and the fresh air system through an AC / DC module, and the control module is respectively connected to the AC / DC module, the energy storage module, and the DC / DC module.

[0004] Preferably, the energy storage module is provided with a photovoltaic charging interface, a grid charging interface, and a power output interface. The photovoltaic charging interface is connected to the DC / DC module, the grid charging interface is connected to the AC / DC module, and the power output interface is connected to the fresh air system.

[0005] Preferably, the energy storage module internally includes a processing unit and multiple battery modules. The battery modules can be selectively connected to the photovoltaic charging interface, the grid charging interface, or the power output interface. Each battery module works independently. The processing unit stores the state information of each battery module, distributes the battery modules to each working sequence according to the state information, and controls the working state of each battery module according to the working sequence.

[0006] Preferably, the status information of the battery module includes an identification number, a current status, and a cycle count. The identification number is a unique number for each battery module within the energy storage module. The current status includes charging, discharging, standby after charging, and standby after discharging. The cycle count represents the number of times the battery module has experienced a complete charging and discharging process.

[0007] Preferably, the working sequence includes a photovoltaic charging sequence, a grid charging sequence, and a discharging sequence. The processing unit sequentially connects the battery modules in the photovoltaic charging sequence to the photovoltaic charging interface to store the electric energy from the photovoltaic modules. The processing unit sequentially connects the battery modules in the grid charging sequence to the grid charging interface to store the electric energy from the AC grid. The processing unit sequentially connects the battery modules in the discharging sequence to the power output interface to supply power to the fresh air system.

[0008] Preferably, the processing unit includes an ARM processor and a memory.

[0009] Preferably, the control module includes a data transmission unit and an analysis and control unit, and the data transmission unit and the analysis and control unit are communicatively connected.

[0010] Preferably, the analysis and control unit includes an FPGA processor and a memory.

[0011] Based on the above photovoltaic DC fresh air flexible regulation system, the photovoltaic DC fresh air flexible regulation method proposed by the present invention specifically includes the following steps:

[0012] S1. During the time period from 20:00 to 9:00 the next day, detect the power of each battery module, set the battery modules with power remaining in the discharging sequence, and discharge them sequentially. After discharging, increment the cycle count of the battery modules in the discharging sequence by 1, set the current status of all battery modules to standby after discharging, supply power to the fresh air system through the AC / DC module by the AC grid, and the energy storage module no longer supplies power to the fresh air system. Perform a charging initialization operation on the energy storage module.

[0013] S2. During the time period from 9:00 of the next day to 11:00 of the next day, the AC power grid stops supplying power to the fresh air system, and the energy storage module starts to supply power to the fresh air system. After the battery module in the discharge sequence finishes discharging, set the current state of the battery module to standby after discharge, increment the cycle count by 1, add the battery module to the standby sequence. After the battery modules in the photovoltaic charging sequence and the grid charging sequence finish charging, set the current state of the battery module to standby after charging, and add the battery module to the standby sequence. Browse the standby sequence, add the battery module with the current state of standby after charging to the discharge sequence, and set the current state of the battery module to discharge. Considering that the sunlight is not very strong at this time, only allocate 1 / 4 of the total number of battery modules to the photovoltaic charging sequence. When the number of battery modules in the photovoltaic charging sequence is less than 1 / 4 of the total, allocate the battery module with the current state of standby after discharge to the photovoltaic charging sequence, and set the current state of the battery module to charge. When the number of battery modules in the photovoltaic charging sequence is greater than or equal to 1 / 4 of the total, allocate the battery module with the current state of standby after discharge to the grid charging sequence, and set the current state of the battery module to charge;

[0014] S3. During the time period from 11:00 of the next day to 16:00 of the next day, the energy storage module continues to supply power to the fresh air system. After the battery module in the discharge sequence finishes discharging, set the current state of the battery module to standby after discharge, increment the cycle count by 1, add the battery module to the standby sequence. After the battery modules in the photovoltaic charging sequence and the grid charging sequence finish charging, set the current state of the battery module to standby after charging, and add the battery module to the standby sequence. Browse the standby sequence, add the battery module with the current state of standby after charging to the discharge sequence, and set the current state of the battery module to discharge. Considering that the sunlight is relatively strong at this time, allocate 1 / 2 of the total number of battery modules to the photovoltaic charging sequence. When the number of battery modules in the photovoltaic charging sequence is less than 1 / 2 of the total, allocate the battery module with the current state of standby after discharge to the photovoltaic charging sequence, and set the current state of the battery module to charge. When the number of battery modules in the photovoltaic charging sequence is greater than or equal to 1 / 2 of the total, allocate the battery module with the current state of standby after discharge to the grid charging sequence, and set the current state of the battery module to charge;

[0015] S4. During the time period from 16:00 of the next day to 20:00 of the next day, the energy storage module continues to supply power to the fresh air system. After the battery module in the discharge sequence finishes discharging, set the current state of the battery module to standby after discharge, increment the cycle count by 1, and add the battery module to the standby sequence. After the battery modules in the photovoltaic charging sequence and the grid charging sequence finish charging, set the current state of the battery module to standby after charging, and add the battery module to the standby sequence. Browse the standby sequence, add the battery modules with the current state of standby after charging to the discharge sequence, set the current state of the battery module to discharge. Considering that the sunlight is very weak at this time, assign the battery modules with the current state of standby after discharge to the grid charging sequence, and set the current state of the battery module to charge.

[0016] Preferably, in S1, the process of the charging initialization operation is to arrange the battery modules in ascending order of the cycle count to form a selection sequence. Select the first 3 / 4 of the battery modules in the selection sequence to charge through the AC grid, set the current state of the charged battery modules to charged, set the battery modules with the current state of charged to the discharge sequence, arrange them in ascending order of the cycle count, set the battery modules with the current state of standby after discharge to the photovoltaic charging sequence, arrange them in ascending order of the cycle count, and set the state of the battery modules to charged.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Throughout the adjustment cycle, with the power supply of the energy storage module as the core, only two switching operations of the power supply method are required, which maximally ensures the stability of the fresh air system while considering the characteristics of photovoltaic power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the photovoltaic DC fresh air flexible adjustment system of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] The technical solutions of the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0021] As Figure 1 shown, the photovoltaic DC fresh air flexible adjustment system proposed by the present invention includes a photovoltaic module, an energy storage module, a control module, and a fresh air system. The photovoltaic module is connected to the energy storage module through a DC / DC module. The energy storage module is connected to the fresh air system. The AC grid is connected to the energy storage module and the fresh air system respectively through an AC / DC module. The control module is connected to the AC / DC module, the energy storage module, and the DC / DC module respectively.

[0022] The energy storage module is provided with a photovoltaic charging interface, a grid charging interface, and a power output interface. The photovoltaic charging interface is connected to the DC / DC module, the grid charging interface is connected to the AC / DC module, and the power output interface is connected to the fresh air system. Inside the energy storage module, there are a processing unit and multiple battery modules. The battery modules can be selectively connected to the photovoltaic charging interface, the grid charging interface, or the power output interface. Each battery module works independently. The processing unit stores the status information of each battery module, allocates the battery modules to each working sequence according to the status information, and controls the working status of each battery module according to the working sequence. The status information of the battery module includes an identification number, a current status, and a cycle count. The identification number is a unique number for each battery module within the energy storage module. The current status includes charging, discharging, standby after charging, and standby after discharging. The cycle count represents the number of times the battery module has experienced a complete charging and discharging process, reflecting the health status of the battery module. The working sequences include a photovoltaic charging sequence, a grid charging sequence, and a discharging sequence. The processing unit sequentially connects the battery modules in the photovoltaic charging sequence to the photovoltaic charging interface to store the electric energy from the photovoltaic modules. The processing unit sequentially connects the battery modules in the grid charging sequence to the grid charging interface to store the electric energy from the AC grid. The processing unit sequentially connects the battery modules in the discharging sequence to the power output interface to supply power to the fresh air system. The processing unit includes an ARM processor and a memory. The total capacity of the energy storage module is twice the electric energy of the photovoltaic modules working at the maximum power for three hours to ensure the normal operation of the system. The number of battery modules in the energy storage module is a multiple of 4.

[0023] The control module includes a data transmission unit and an analysis and control unit, and the data transmission unit and the analysis and control unit are communicatively connected. The data transmission unit is communicatively connected to the AC / DC module, the energy storage module, and the DC / DC module through wireless communication, receives data from the AC / DC module, the energy storage module, and the DC / DC module, or transmits the instructions of the analysis and control unit to the AC / DC module, the energy storage module, and the DC / DC module. The analysis and control unit includes an FPGA processor and a memory, and controls the working process of the photovoltaic DC fresh air flexible regulation system.

[0024] The photovoltaic DC fresh air flexible regulation method specifically includes the following steps:

[0025] S1. During the time period from 20:00 to 9:00 the next day, detect the power of each battery module. Set the battery modules with power reserve in the discharge sequence and discharge them in turn. After discharging, increment the cycle count of the battery modules in the discharge sequence by 1. Set the current state of all battery modules to standby after discharge. The AC grid powers the fresh air system through the AC / DC module, and the energy storage module no longer powers the fresh air system. Perform a charging initialization operation on the energy storage module. The process of the charging initialization operation is to arrange the battery modules in ascending order of the cycle count to form a selection sequence. Select the first 3 / 4 of the battery modules in the selection sequence to be charged through the AC grid. Set the current state of the charged battery modules to charging. Set the battery modules with the current state of charging in the discharge sequence and arrange them in ascending order of the cycle count. Set the battery modules with the current state of standby after discharge in the photovoltaic charging sequence and arrange them in ascending order of the cycle count. Set the state of the battery modules among them to charging.

[0026] S2. During the time period from 9:00 to 11:00 the next day, the AC grid no longer powers the fresh air system, and the energy storage module starts to power the fresh air system. After the battery modules in the discharge sequence finish discharging, set the current state of the battery modules to standby after discharge, increment the cycle count by 1, and add the battery modules to the standby sequence. After the battery modules in the photovoltaic charging sequence and the grid charging sequence finish charging, set the current state of the battery modules to standby after charging and add the battery modules to the standby sequence. Browse the standby sequence, add the battery modules with the current state of standby after charging to the discharge sequence, and set the current state of the battery modules to discharging. Considering that the sunlight is not very strong at this time, only allocate 1 / 4 of the total number of battery modules to the photovoltaic charging sequence. When the number of battery modules in the photovoltaic charging sequence is less than 1 / 4 of the total, allocate the battery modules with the current state of standby after discharge to the photovoltaic charging sequence and set the current state of the battery modules to charging. When the number of battery modules in the photovoltaic charging sequence is greater than or equal to 1 / 4 of the total, allocate the battery modules with the current state of standby after discharge to the grid charging sequence and set the current state of the battery modules to charging.

[0027] S3. During the time period from 11:00 of the next day to 16:00 of the next day, the energy storage module continues to supply power to the fresh air system. After the battery modules in the discharge sequence finish discharging, set the current state of the battery module to standby after discharge, increment the cycle count by 1, and add the battery module to the standby sequence. After the battery modules in the photovoltaic charging sequence and the grid charging sequence finish charging, set the current state of the battery module to standby after charging, and add the battery module to the standby sequence. Browse the standby sequence, add the battery modules with the current state of standby after charging to the discharge sequence, and set the current state of the battery module to discharge. Considering that the solar illumination is relatively strong at this time, allocate half of the total number of battery modules to the photovoltaic charging sequence. When the number of battery modules in the photovoltaic charging sequence is less than half of the total, allocate the battery modules with the current state of standby after discharge to the photovoltaic charging sequence, and set the current state of the battery module to charge. When the number of battery modules in the photovoltaic charging sequence is greater than or equal to half of the total, allocate the battery modules with the current state of standby after discharge to the grid charging sequence, and set the current state of the battery module to charge.

[0028] S4. During the time period from 16:00 of the next day to 20:00 of the next day, the energy storage module continues to supply power to the fresh air system. After the battery modules in the discharge sequence finish discharging, set the current state of the battery module to standby after discharge, increment the cycle count by 1, and add the battery module to the standby sequence. After the battery modules in the photovoltaic charging sequence and the grid charging sequence finish charging, set the current state of the battery module to standby after charging, and add the battery module to the standby sequence. Browse the standby sequence, add the battery modules with the current state of standby after charging to the discharge sequence, and set the current state of the battery module to discharge. Considering that the solar illumination is very weak at this time, allocate the battery modules with the current state of standby after discharge to the grid charging sequence, and set the current state of the battery module to charge.

[0029] Throughout the adjustment cycle, with the power supply of the energy storage module as the core, only two switches of the power supply method are required, which maximally ensures the stability of the fresh air system while considering the characteristics of photovoltaic power generation.

[0030] The above-disclosed are only the preferred embodiments of the present invention, and of course, the scope of the rights of the present invention cannot be limited thereby. It should be noted that for those skilled in the art of this technology, any equivalent changes made to the present invention without departing from the design structure and principle of the present invention are regarded as the protection scope of the present invention.

Claims

1. A photovoltaic DC fresh air flexible adjustment method, based on a photovoltaic DC fresh air flexible adjustment system. The photovoltaic DC fresh air flexible adjustment system includes a photovoltaic module, an energy storage module, a control module, and a fresh air system. The photovoltaic module is connected to the energy storage module through a DC / DC module. The energy storage module is connected to the fresh air system. The AC power grid is connected to the energy storage module and the fresh air system respectively through an AC / DC module. The control module is connected to the AC / DC module, the energy storage module, and the DC / DC module respectively; The energy storage module is provided with a photovoltaic charging interface, a grid charging interface, and a power output interface. The photovoltaic charging interface is connected to the DC / DC module. The grid charging interface is connected to the AC / DC module. The power output interface is connected to the fresh air system; The energy storage module internally includes a processing unit and multiple battery modules. The battery modules can be selectively connected to the photovoltaic charging interface, the grid charging interface, or the power output interface. Each battery module works independently. The processing unit stores the status information of each battery module, distributes the battery modules to each working sequence according to the status information, and controls the working status of each battery module according to the working sequence; The status information of the battery module includes an identification number, a current status, and a cycle number. The identification number is a unique number for each battery module in the energy storage module. The current status includes charging, discharging, standby after charging, and standby after discharging. The cycle number represents the number of times the battery module has experienced a complete charging and discharging process; The working sequences include a photovoltaic charging sequence, a grid charging sequence, and a discharging sequence. The processing unit sequentially connects the battery modules in the photovoltaic charging sequence to the photovoltaic charging interface to store the electric energy from the photovoltaic module. The processing unit sequentially connects the battery modules in the grid charging sequence to the grid charging interface to store the electric energy from the AC power grid. The processing unit sequentially connects the battery modules in the discharging sequence to the power output interface to supply power to the fresh air system; It is characterized in that The photovoltaic DC fresh air flexible adjustment method specifically includes the following steps: S1. In the time period from 20:00 to 9:00 the next day, detect the power of each battery module, set the battery modules with remaining power in the discharging sequence, and discharge them sequentially. After discharging, add 1 to the cycle number of the battery modules in the discharging sequence, set the current status of all battery modules to standby after discharging, the AC power grid supplies power to the fresh air system through the AC / DC module, the energy storage module no longer supplies power to the fresh air system, and perform a charging initialization operation on the energy storage module; S2. During the time period from 9:00 of the next day to 11:00 of the next day, the AC power grid stops supplying power to the fresh air system, and the energy storage module starts to supply power to the fresh air system. After the battery module in the discharge sequence finishes discharging, set the current state of the battery module to standby after discharge, increment the cycle count by 1, add the battery module to the standby sequence. After the battery modules in the photovoltaic charging sequence and the grid charging sequence finish charging, set the current state of the battery module to standby after charging, and add the battery module to the standby sequence. Browse the standby sequence, add the battery module with the current state of standby after charging to the discharge sequence, and set the current state of the battery module to discharge. When the number of battery modules in the photovoltaic charging sequence is less than 1 / 4 of the total amount, allocate the battery module with the current state of standby after discharge to the photovoltaic charging sequence, and set the current state of the battery module to charge. When the number of battery modules in the photovoltaic charging sequence is greater than or equal to 1 / 4 of the total amount, allocate the battery module with the current state of standby after discharge to the grid charging sequence, and set the current state of the battery module to charge; S3. During the time period from 11:00 of the next day to 16:00 of the next day, the energy storage module continues to supply power to the fresh air system. After the battery module in the discharge sequence finishes discharging, set the current state of the battery module to standby after discharge, increment the cycle count by 1, add the battery module to the standby sequence. After the battery modules in the photovoltaic charging sequence and the grid charging sequence finish charging, set the current state of the battery module to standby after charging, and add the battery module to the standby sequence. Browse the standby sequence, add the battery module with the current state of standby after charging to the discharge sequence, and set the current state of the battery module to discharge. When the number of battery modules in the photovoltaic charging sequence is less than 1 / 2 of the total amount, allocate the battery module with the current state of standby after discharge to the photovoltaic charging sequence, and set the current state of the battery module to charge. When the number of battery modules in the photovoltaic charging sequence is greater than or equal to 1 / 2 of the total amount, allocate the battery module with the current state of standby after discharge to the grid charging sequence, and set the current state of the battery module to charge; S4. During the time period from 16:00 of the next day to 20:00 of the next day, the energy storage module continues to supply power to the fresh air system. After the battery module in the discharge sequence finishes discharging, set the current state of the battery module to standby after discharge, increment the cycle count by 1, add the battery module to the standby sequence. After the battery modules in the photovoltaic charging sequence and the grid charging sequence finish charging, set the current state of the battery module to standby after charging, and add the battery module to the standby sequence. Browse the standby sequence, add the battery module with the current state of standby after charging to the discharge sequence, and set the current state of the battery module to discharge. Allocate the battery module with the current state of standby after discharge to the grid charging sequence, and set the current state of the battery module to charge.

2. The photovoltaic DC fresh air flexible adjustment method according to claim 1, characterized in that The processing unit includes an ARM processor and a memory.

3. The photovoltaic DC fresh air flexible adjustment method according to claim 1, characterized in that The control module includes a data transmission unit and an analysis and control unit, and the data transmission unit is communicatively connected to the analysis and control unit.

4. The photovoltaic DC fresh air flexible adjustment method according to claim 3, characterized in that The analysis and control unit includes an FPGA processor and a memory.

5. The photovoltaic DC fresh air flexible adjustment method according to claim 1, characterized in that, In S1, the process of the charging initialization operation is to arrange the battery modules in ascending order of the number of cycles to form a selection sequence. Select the first 3 / 4 of the battery modules in the selection sequence to be charged through the AC power grid. Set the current state of the charged battery modules to charged. Set the battery modules with the current state of charged in the discharge sequence and arrange them in ascending order of the number of cycles. Set the battery modules with the current state of standby after discharge in the photovoltaic charging sequence and arrange them in ascending order of the number of cycles. Set the state of some of the battery modules to charged.

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