CN-122015208-A - Control method and device of light storage off-grid air conditioning system and photovoltaic air conditioner

CN122015208ACN 122015208 ACN122015208 ACN 122015208ACN-122015208-A

Abstract

The application relates to a control method and a device of an optical storage and off-grid air conditioning system, a photovoltaic air conditioner and a storage medium, wherein the method comprises the steps of acquiring the current moment and determining the time range to which the current moment belongs under the condition that the optical storage and off-grid air conditioning system is in an off-grid mode, and acquiring the charge state of the energy storage system; and carrying out linkage control on the photovoltaic air conditioner, the photovoltaic system and the energy storage system according to the time range and the state of charge of the energy storage system. So as to realize that the stable operation can be maintained under the off-grid condition of photovoltaic power generation power fluctuation. The problem that the traditional photovoltaic air conditioning system without the storage off-grid is frequently started and stopped due to insufficient photovoltaic power supply in low-light time periods such as the morning and evening is solved, the service life and the operation reliability of core components such as an air conditioning compressor are guaranteed, indoor temperature fluctuation is remarkably smoothed, and the use experience of a user is improved.

Inventors

CHEN NINGNING
HUANG MENG
HUANG SONGRU
An Hongdi

Assignees

珠海格力电器股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (11)

1. The control method of the light storage off-grid air conditioning system is characterized in that the light storage off-grid air conditioning system comprises a photovoltaic air conditioner, a photovoltaic system and an energy storage system, wherein the photovoltaic air conditioner, the photovoltaic system and the energy storage system are all connected to a direct current bus, and the method comprises the following steps: under the condition that the optical storage and off-grid air conditioning system is in an off-grid mode, acquiring a current moment and determining a time range to which the current moment belongs; Acquiring the state of charge of the energy storage system; And carrying out linkage control on the photovoltaic air conditioner, the photovoltaic system and the energy storage system according to the time range and the state of charge of the energy storage system.
2. The method of claim 1, wherein the light storage off-grid air conditioning system further comprises an auxiliary power source, the auxiliary power source being coupled to the photovoltaic system, the method further comprising, prior to the current time of day: when the photovoltaic system has a power generation condition, the auxiliary power supply is started to supply power to the optical storage and off-grid air conditioning system, so that the optical storage and off-grid air conditioning system has a starting operation condition; And in the working process of the photovoltaic system, the voltage of the direct-current bus is always stabilized through the energy storage system.
3. The method of claim 1, wherein the performing coordinated control of the photovoltaic air conditioner, the photovoltaic system, and the energy storage system according to the time range and the state of charge of the energy storage system comprises: Under the condition that the time range is a first time range, the following linkage control is executed on the photovoltaic air conditioner, the photovoltaic system and the energy storage system: If the photovoltaic air conditioner is started, detecting whether the state of charge of the energy storage system is larger than a preset first threshold value; Controlling the photovoltaic system and the energy storage system to jointly drive the photovoltaic air conditioner to operate under the condition that the charge state of the energy storage system is larger than a preset first threshold value; controlling the photovoltaic system and the energy storage system to drive the photovoltaic air conditioner to operate together under the condition that the charge state of the energy storage system is smaller than or equal to a preset first threshold value, gradually reducing the frequency of a compressor of the photovoltaic air conditioner, and reducing the electricity supplementing of the energy storage system until the generated energy of the photovoltaic system and the electricity consumption of the photovoltaic air conditioner reach balance, wherein the energy storage system stops supplementing electricity; if the photovoltaic air conditioner is not started, detecting whether the state of charge of the energy storage system is smaller than a preset second threshold value; controlling the photovoltaic system to charge the energy storage system under the condition that the charge state of the energy storage system is smaller than a preset second threshold value; And under the condition that the state of charge of the energy storage system reaches a preset second threshold value, controlling the photovoltaic system to stop generating electricity.
4. The method of claim 1, wherein the performing coordinated control of the photovoltaic air conditioner, the photovoltaic system, and the energy storage system according to the time range and the state of charge of the energy storage system comprises: Under the condition that the time range is a second time range, the following linkage control is executed on the photovoltaic air conditioner, the photovoltaic system and the energy storage system: if the power supply power of the photovoltaic system is larger than the power consumption power of the photovoltaic air conditioner, detecting whether the state of charge of the energy storage system is smaller than a preset second threshold value; Controlling surplus electric energy of the photovoltaic system to charge the energy storage system under the condition that the state of charge of the energy storage system is smaller than a preset second threshold value; If the power supply of the photovoltaic system is smaller than the power consumption of the photovoltaic air conditioner, controlling the photovoltaic system and the energy storage system to drive the photovoltaic air conditioner to operate together, gradually reducing the frequency of a compressor of the photovoltaic air conditioner, and reducing the power supply of the energy storage system until the generated energy of the photovoltaic system and the power consumption of the photovoltaic air conditioner reach balance, and stopping the power supply of the energy storage system; And if the power supply of the photovoltaic system is equal to the power supply of the photovoltaic air conditioner, only controlling the photovoltaic system to drive the photovoltaic air conditioner to operate, and maintaining the current compressor frequency of the photovoltaic air conditioner.
5. The method of claim 1, wherein the performing coordinated control of the photovoltaic air conditioner, the photovoltaic system, and the energy storage system according to the time range and the state of charge of the energy storage system comprises: Under the condition that the time range is a third time range, the following linkage control is executed on the photovoltaic air conditioner, the photovoltaic system and the energy storage system: Controlling the photovoltaic system and the energy storage system to jointly drive the photovoltaic air conditioner to operate, and gradually reducing the frequency of a compressor of the photovoltaic air conditioner until the generated power of the photovoltaic system is close to a preset power threshold value, reducing the frequency of the compressor of the photovoltaic air conditioner to the preset frequency threshold value, and stopping the photovoltaic storage and off-grid air conditioner system; Detecting whether the state of charge of the energy storage system is smaller than a preset third threshold value in real time in the process of gradually reducing the frequency of the compressor of the photovoltaic air conditioner; And under the condition that the charge state of the energy storage system is smaller than a preset third threshold value, closing the compressor of the photovoltaic air conditioner, stopping the photovoltaic air conditioner system, and controlling the photovoltaic system to charge the energy storage system until the generated power of the photovoltaic system is close to the preset power threshold value.
6. A method according to claim 3, wherein said step-down the compressor frequency of the photovoltaic air conditioner comprises: Monitoring the state of charge of the energy storage system in real time, and searching a step interval where the state of charge of the energy storage system is located; acquiring a first frequency-reducing step length corresponding to the step interval, and gradually reducing the frequency of a compressor of the photovoltaic air conditioner according to the first frequency-reducing step length; Or alternatively Acquiring real-time illumination intensity through an irradiance sensor of the photovoltaic system, and searching an illumination intensity interval in which the real-time illumination intensity is located; And obtaining a second frequency-reducing step length corresponding to the illumination intensity interval, and gradually reducing the frequency of the compressor of the photovoltaic air conditioner according to the second frequency-reducing step length.
7. The method of claim 4, wherein the step-down the compressor frequency of the photovoltaic air conditioner comprises: acquiring a power difference value between the power supply power of the photovoltaic system and the power consumption power of the photovoltaic air conditioner; Searching a third frequency-reducing step length corresponding to the power difference value, and gradually reducing the frequency of a compressor of the photovoltaic air conditioner according to the third frequency-reducing step length; Or alternatively Acquiring a fixed basic frequency-reducing step length, and determining the electricity-supplementing quantity reduction rate of the energy storage system; Searching a correction step length corresponding to the compensation quantity reduction rate, and obtaining the sum of the fixed basic frequency-reducing step length and the correction step length; and gradually reducing the frequency of the compressor of the photovoltaic air conditioner according to the sum of the fixed basic frequency-reducing step length and the correction step length.
8. The method of claim 5, wherein said gradually reducing the compressor frequency of the photovoltaic air conditioner comprises: calculating the attenuation rate of the generated power of the photovoltaic system in real time, and fitting a linear frequency-reducing curve of the frequency of the compressor based on the attenuation rate; Gradually reducing the compressor frequency of the photovoltaic air conditioner according to the linear frequency-reducing curve of the compressor frequency; Or alternatively When the generated power of the photovoltaic system is attenuated to a critical power generation threshold value, gradually reducing the frequency of a compressor of the photovoltaic air conditioner according to a basic frequency-reducing step length; When the state of charge of the energy storage system reaches a critical state threshold value, gradually reducing the frequency of a compressor of the photovoltaic air conditioner according to an emergency frequency reduction step; Or alternatively Predicting the power supply duration of the photovoltaic system, and dividing the power supply duration into a plurality of sub-duration intervals; Determining a target sub-duration interval in which the current moment is located from a plurality of sub-duration intervals; gradually reducing the frequency of a compressor of the photovoltaic air conditioner according to the frequency-reducing step length corresponding to the target sub-duration interval; The frequency-reducing step length corresponding to each sub-long interval is gradually increased.
9. The utility model provides a light stores up and off-grid air conditioning system's controlling means, its characterized in that, light stores up and off-grid air conditioning system includes photovoltaic air conditioner, photovoltaic system, energy storage system, photovoltaic air conditioner photovoltaic system reaches energy storage system all connects on direct current bus, the device includes: The range determining module is used for acquiring the current moment and determining the time range of the current moment under the condition that the optical storage and off-grid air conditioning system is in an off-grid mode; the state acquisition module is used for acquiring the state of charge of the energy storage system; And the linkage control module is used for carrying out linkage control on the photovoltaic air conditioner, the photovoltaic system and the energy storage system according to the time range and the state of charge of the energy storage system.
10. The photovoltaic air conditioner is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus; a memory for storing a computer program; a processor for implementing the method of any one of claims 1-8 when executing a program stored on a memory.
11. A storage medium having stored thereon a computer program, which when executed by a processor performs the method of any of claims 1-8.

Description

Control method and device of light storage off-grid air conditioning system and photovoltaic air conditioner Technical Field The application relates to the technical field of intelligent home, in particular to a control method and device of an optical storage and off-grid air conditioning system and a photovoltaic air conditioner. Background Along with the wide application of photovoltaic energy sources and the improvement of energy conservation and emission reduction requirements, the photovoltaic air conditioning system without storage and off-grid gradually becomes an important direction in the field of photovoltaic application due to the advantages of no energy storage device and controllable cost. The system is designed with two running modes of grid connection and grid disconnection, when the power grid is normal, the photovoltaic power generation is preferentially supplied to an air conditioner load, and redundant electric energy can be integrated into the power grid or distributed to other electric equipment, so that the efficient utilization of the photovoltaic energy is realized, and the development trend of the current energy multi-element utilization is met. In order to cope with sudden situations such as power grid faults, the non-storage off-grid type photovoltaic air conditioning system is provided with a mode switching function, when the power grid is abnormal, the off-grid mode is automatically switched, the photovoltaic power generation is used for independently driving the air conditioner internal and external units to operate, and the basic refrigerating or heating requirements of the air conditioner are guaranteed. However, photovoltaic power generation is obviously influenced by natural factors such as illumination intensity, weather change and the like, natural randomness and uncertainty exist, and the output power of the photovoltaic power generation can be greatly fluctuated along with day-night alternation and illumination change. In the off-grid mode, when the photovoltaic output power cannot stably meet the operation power requirements of the indoor unit and the outdoor unit of the air conditioner, particularly in the early morning and evening hours when the illumination is weak, the air conditioner is extremely easy to stop and start frequently. The frequent start and stop can not only seriously shorten the service lives of core components such as an air conditioner compressor and the like and reduce the running reliability of the whole machine, but also cause overlarge indoor temperature fluctuation and seriously influence the use experience of users. Disclosure of Invention In order to solve the problems that in the off-grid mode, when the photovoltaic output power cannot stably meet the operation power requirements of the indoor unit and the outdoor unit of the air conditioner, particularly in the early morning and evening hours when the illumination is weak, the air conditioner is easy to stop and start frequently. The frequent start and stop not only can seriously shorten the service life of core components such as an air conditioner compressor and the like and reduce the operation reliability of the whole machine, but also can cause the technical problems that the indoor temperature fluctuation is too large and the use experience of a user is seriously influenced. The specific technical scheme is as follows: in a first aspect, the present application provides a control method for an optical storage and off-grid air conditioning system, where the optical storage and off-grid air conditioning system includes a photovoltaic air conditioner, a photovoltaic system, and an energy storage system, and the photovoltaic air conditioner, the photovoltaic system, and the energy storage system are all connected to a dc bus, and the method includes: under the condition that the optical storage and off-grid air conditioning system is in an off-grid mode, acquiring a current moment and determining a time range to which the current moment belongs; Acquiring the state of charge of the energy storage system; And carrying out linkage control on the photovoltaic air conditioner, the photovoltaic system and the energy storage system according to the time range and the state of charge of the energy storage system. In an optional embodiment, the light storing and off-grid air conditioning system further includes an auxiliary power source, the auxiliary power source is connected with the photovoltaic system, and before the current time is obtained, the method further includes: when the photovoltaic system has a power generation condition, the auxiliary power supply is started to supply power to the optical storage and off-grid air conditioning system, so that the optical storage and off-grid air conditioning system has a starting operation condition; And in the working process of the photovoltaic system, the voltage of the direct-current bus is always stabilized through the energy storage system.