Photovoltaic air conditioner controller fault detection device and method

Abstract

The invention discloses a photovoltaic air conditioner controller fault detection device and method. The device comprises a controller monitoring signal acquisition module, an air conditioner system main control module, a bus discharge control switch, a discharge loop, an energy storage module, a fault signal feedback module and a terminal. The controller monitoring signal acquisition module is used for acquiring health state data of the photovoltaic air conditioner controller; the air conditioner system main control module is used for controlling the connection condition of the bus discharge control switch, the discharge loop and the energy storage module after the air conditioner receives a shutdown instruction, so that the discharge of the direct current bus of the controller and the recovery of residual electric energy are realized; controller fault detection is carried out, and when a controller fault is detected, the fault signal feedback module is controlled to feed back fault information to the terminal; the energy storage module is used for supplying power to the fault signal feedback module. On the premise that an air conditioner outdoor unit is not disassembled, controller fault information can be rapidly positioned and confirmed through wireless transmission, the air conditioner overhaul process is accelerated, and energy waste is reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and specifically to a fault detection device and method for a photovoltaic air conditioning controller. Background Technology

[0002] With the rapid growth of global energy demand and the increasing severity of environmental pollution, solar energy, as an emerging power generation method, has shown enormous development potential and broad application prospects due to its advantages such as zero pollution, low noise, and ease of maintenance. Photovoltaic air conditioning is an important application area in this field.

[0003] The current mainstream photovoltaic air conditioning controller architecture revolves around the DC bus, enabling real-time parameter identification, data sharing, and logical complementarity for deep interactive control and monitoring of photovoltaic, energy storage, wind turbine, compressor, and DC load connected to the DC bus.

[0004] The mainstream methods for air conditioner controllers involve monitoring controller faults through the flashing frequency of LEDs on the panel and corresponding interpretation rules, or through communication with the outdoor unit and accompanying debugging software. Outdoor units typically have multiple controllers managing different functions, each equipped with corresponding fault protection measures and fault displays. Extracting fault information generally requires connecting a computer to a terminal block on the mainboard. Furthermore, outdoor units often operate in harsh environments, and displays such as digital tubes are usually built into the unit casing. Therefore, the aforementioned fault monitoring methods all require disassembling the outdoor unit casing to obtain data. Due to the complex installation scenarios of outdoor units, in special situations such as high-rise buildings, confined spaces, and multi-unit installations, on-site confirmation of controller fault information by maintenance, repair, and development personnel presents certain difficulties, delays, and dangers. In addition, currently, residual power on the DC bus is consumed through resistors on the control board, resulting in energy waste. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a novel photovoltaic air conditioner controller fault detection device and method. This device and method can quickly locate and confirm controller fault information through wireless transmission without disassembling the outdoor unit of the air conditioner, providing technical support for subsequent maintenance solutions and enabling the recovery and utilization of controller DC bus energy, thereby reducing energy waste.

[0006] The present invention adopts the following technical solution.

[0007] The first aspect of the present invention provides a photovoltaic air conditioner controller fault detection device, comprising a controller monitoring signal acquisition module, an air conditioning system main control module, a bus discharge control switch, a discharge circuit, an energy storage module, and a fault signal feedback module installed inside the air conditioner outdoor unit, as well as a terminal applied to the outside of the air conditioner outdoor unit;

[0008] The controller monitoring signal acquisition module, the bus discharge control switch, and the fault signal feedback module are all connected to the air conditioning system main control module.

[0009] The controller monitoring signal acquisition module is used to acquire health status data of the photovoltaic air conditioner controller;

[0010] The main control module of the air conditioning system is used to control the connection status of the bus discharge control switch, the discharge circuit and the energy storage module after the air conditioner receives a shutdown command, so as to realize the discharge of the DC bus of the controller and the recovery of residual energy; it is also used to perform controller fault detection based on the health status data of the photovoltaic air conditioning controller, and when a controller fault is detected, control the fault signal feedback module to feed back the fault information to the terminal in a wireless communication manner.

[0011] The energy storage module is used to power the fault signal feedback module using the recovered residual electrical energy.

[0012] Preferably, the health status data of the photovoltaic air conditioner controller includes bus voltage, IGBT temperature signal, photovoltaic DC voltage, photovoltaic DC current, photovoltaic insulation impedance, grid control switch signal, and communication signal.

[0013] Preferably, the strategy by which the main control module of the air conditioning system controls the connection between the bus discharge control switch and the discharge circuit and the energy storage module includes:

[0014] After the air conditioner receives the shutdown command, the main control module of the air conditioning system disconnects the control switch of the DC bus converter, so that the DC bus enters the discharge state. At the same time as the air conditioner receives the shutdown command, a control command is issued to delay disconnecting the AC side control switch, so as to ensure normal power supply when the main control module of the air conditioning system controls the connection between the bus discharge control switch and the discharge circuit and the energy storage module.

[0015] When the DC bus enters the discharge state, the air conditioning system main control module controls the bus discharge control switch to connect to the discharge circuit to discharge the DC bus; when the DC bus discharges to the set low voltage state, the air conditioning system main control module controls the bus discharge control switch to connect to the energy storage module, and uses the residual electrical energy of the DC bus to charge the energy storage module to realize the recovery of residual electrical energy.

[0016] Preferably, the device further includes a bus voltage indicator light, used to indicate the status of the DC bus under the control of the air conditioning system main control module, wherein the status of the DC bus includes high voltage status, discharge status and low voltage status.

[0017] Preferably, the fault signal feedback module includes active, standby, and sleep modes. In active mode, the fault signal feedback module communicates with the terminal and transmits data; in standby mode, it communicates with the terminal but does not transmit data; and in sleep mode, it does not communicate with the terminal.

[0018] Preferably, when the main control module of the air conditioning system does not detect a controller fault, it controls the fault signal feedback module to be in sleep mode; when a controller fault is detected, it sends the fault information to the fault signal feedback module and controls the fault signal feedback module to enter active mode to feed back the fault information to the terminal; after completing the fault information feedback in active mode, the fault signal feedback module enters standby mode and maintains it for a set time, and then enters sleep mode.

[0019] A second aspect of this invention provides a fault detection method for a photovoltaic air conditioner controller, comprising:

[0020] Obtain health status data of photovoltaic air conditioner controller;

[0021] After the air conditioner receives the shutdown command, it discharges the DC bus of the controller and recovers residual electrical energy.

[0022] The controller fault is detected based on the health status data of the photovoltaic air conditioner controller, and when a controller fault is detected, the residual electrical energy recovered is used to feed back the fault information wirelessly.

[0023] A third aspect of the present invention provides a photovoltaic air conditioner, including the aforementioned photovoltaic air conditioner controller fault detection device.

[0024] A fourth aspect of the present invention provides a computer device comprising a processor for implementing the fault detection method when executing a program stored in a memory.

[0025] The fifth aspect of the present invention provides a readable storage medium having a program stored thereon, which, when executed by a processor, implements the fault detection method described above.

[0026] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0027] This invention detects controller faults based on the health status data of the photovoltaic air conditioner controller. When a fault is detected, it controls a fault signal feedback module located inside the outdoor unit of the air conditioner to wirelessly transmit fault information to an external terminal. This allows for rapid location and confirmation of controller fault information without disassembling the outdoor unit, providing technical support for subsequent repair plans, accelerating the air conditioner maintenance process, and increasing user satisfaction. It is particularly suitable for obtaining controller fault information in complex installation scenarios of air conditioner outdoor units. Simultaneously, after the air conditioner receives a shutdown command, it controls the connection between the bus discharge control switch, the discharge circuit, and the energy storage module. This enables the discharge of the controller's DC bus and the recovery of residual energy, using the recovered residual energy to power the fault signal feedback module and reducing energy waste.

[0028] The health status data of the photovoltaic air conditioner controller obtained by this invention includes bus voltage, IGBT temperature signal, photovoltaic DC voltage, photovoltaic DC current, photovoltaic insulation impedance, grid control switch signal and communication signal, covering the key parameters of the controller's health status, and enabling comprehensive fault detection of the controller.

[0029] This invention issues a control command simultaneously with the air conditioner receiving a shutdown command, delaying the disconnection of the AC side control switch. This ensures normal power supply when the air conditioning system's main control module controls the bus discharge control switch, discharge circuit, and energy storage module. Furthermore, when the DC bus enters a discharge state, the invention connects the bus discharge control switch to the discharge circuit. When the DC bus discharges to a set low-voltage state, the invention connects the bus discharge control switch to the energy storage module. This achieves high-voltage discharge to avoid danger and low-voltage energy recovery to reduce waste.

[0030] This invention, by setting a bus voltage indicator light, can indicate the status of the DC bus, remind the air conditioner outdoor unit controller of the residual bus voltage, avoid electric shock, and ensure the electrical safety of personnel.

[0031] The fault signal feedback module of this invention has active, standby and sleep modes, which can flexibly adapt to different scenarios and are energy-saving and efficient. Attached Figure Description

[0032] Figure 1 This is a structural diagram of the photovoltaic air conditioner controller fault detection device of the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0034] like Figure 1 As shown, Embodiment 1 of the present invention provides a photovoltaic air conditioner controller fault detection device, including a controller monitoring signal acquisition module, an air conditioning system main control module, a bus discharge control switch, a discharge circuit, an energy storage module, and a fault signal feedback module installed inside the air conditioner outdoor unit, as well as a terminal applied to the outside of the air conditioner outdoor unit;

[0035] The controller monitoring signal acquisition module, the bus discharge control switch, and the fault signal feedback module are all connected to the air conditioning system main control module.

[0036] The controller monitoring signal acquisition module is used to acquire health status data of the photovoltaic air conditioner controller;

[0037] The main control module of the air conditioning system is used to control the connection status of the bus discharge control switch, the discharge circuit and the energy storage module after the air conditioner receives a shutdown command, so as to realize the discharge of the DC bus of the controller and the recovery of residual energy; it is also used to perform controller fault detection based on the health status data of the photovoltaic air conditioning controller, and when a controller fault is detected, control the fault signal feedback module to feed back the fault information to the terminal in a wireless communication manner.

[0038] The energy storage module is used to power the fault signal feedback module using the recovered residual electrical energy.

[0039] This invention detects controller faults based on the health status data of the photovoltaic air conditioner controller. When a fault is detected, it controls a fault signal feedback module located inside the outdoor unit of the air conditioner to wirelessly transmit fault information to an external terminal. This allows for rapid location and confirmation of controller fault information without disassembling the outdoor unit, providing technical support for subsequent repair plans, accelerating the air conditioner maintenance process, and increasing user satisfaction. It is particularly suitable for obtaining controller fault information in complex installation scenarios of air conditioner outdoor units. Simultaneously, after the air conditioner receives a shutdown command, it controls the connection between the bus discharge control switch, the discharge circuit, and the energy storage module. This enables the discharge of the controller's DC bus and the recovery of residual energy, using the recovered residual energy to power the fault signal feedback module and reducing energy waste.

[0040] More preferably, the health status data of the photovoltaic air conditioner controller includes detection items such as bus voltage, IGBT temperature signal, photovoltaic DC voltage, photovoltaic DC current, photovoltaic insulation impedance, grid control switch signal, and communication signal.

[0041] The acquisition of various signals and their corresponding fault types are as follows:

[0042] 1) Bus voltage detection: The current is converted to mA level through a resistor of several megohms and then converted by the AD conversion of the control chip of the air conditioning system main control module to complete the signal acquisition, which is used to monitor whether the power supply of the controller is normal in real time.

[0043] 2) The IGBT temperature signal can be converted into a small voltage signal by an external temperature sensor, and then the signal can be acquired by the AD conversion of the control chip of the air conditioning system main control module. This is used to monitor in real time whether the temperature of the DC boost circuit is within the normal range and prevent the controller components from being damaged due to excessive temperature.

[0044] 3) The photovoltaic DC voltage is converted into mA-level current through a resistor of several megohms, and then the signal is acquired by the AD conversion of the control chip of the air conditioning system main control module. This signal is used to monitor in real time whether the photovoltaic input voltage is within the normal range and to prevent the controller components from being damaged due to excessive voltage.

[0045] 4) The photovoltaic DC voltage is converted into a small voltage by a component-level current sensor and then converted by the AD conversion of the control chip of the air conditioning system main control module to complete the signal acquisition. This is used to monitor in real time whether the photovoltaic input current is within the normal range and prevent the controller components from being damaged due to excessive current.

[0046] 5) Photovoltaic insulation impedance: The photovoltaic to ground (PE) leakage current is collected through a specific modular circuit. This is used to monitor the presence of leakage current in real time and prevent the photovoltaic cable from causing injury to people due to leakage current caused by damage to the outer sheath. If leakage current is present, the control system will take protective measures, disconnect the photovoltaic source and indicate the fault.

[0047] 6) Grid control switch signal. Generally, this type of switch is a relay. The relay is controlled by voltage to open and close, and is used to monitor whether the photovoltaic air conditioner controller can disconnect the mains power normally.

[0048] 7) Communication signals: Generally, there are multiple controllers inside an air conditioner, which are responsible for controlling each module. Whether they can communicate normally is very important. The normal communication between controllers is usually detected by judging the signal transmission and response method of the agreed communication protocol. If the communication between controllers is abnormal, the air conditioner cannot be turned on normally.

[0049] The aforementioned bus voltage, IGBT temperature signal, photovoltaic DC voltage, photovoltaic DC current, photovoltaic insulation impedance, grid control switch signal, and communication signal cover the key parameters of the controller's health status, enabling comprehensive fault detection of the controller.

[0050] In practical implementation, the main control module of the air conditioning system primarily functions as an information processing, detection, and logic control unit. The raw signal is converted into a small voltage and current through sampling circuits such as filtering, scaling, and comparison. This signal then flows into the A / D converter of the control chip in the main control module. The acquired value is logically compared with the value given in the program code burned into the chip. The given logical judgment value is based on the value written in the code. The logical judgment is mostly based on comparison of magnitude and range. If the value exceeds or falls below the value / range given in the program code, a fault is reported. After a fault occurs, the control chip of the main control module sends the information to the fault signal feedback module via a transmission line. Existing signal acquisition circuits and judgment logic can be used.

[0051] More preferably, the strategy by which the main control module of the air conditioning system controls the connection between the bus discharge control switch and the discharge circuit and the energy storage module includes:

[0052] After the air conditioner receives the shutdown command, the main control module of the air conditioning system disconnects the control switch of the DC bus converter, so that the DC bus enters the discharge state. At the same time as the air conditioner receives the shutdown command, a control command is issued to delay disconnecting the AC side control switch, so as to ensure normal power supply when the main control module of the air conditioning system controls the connection between the bus discharge control switch and the discharge circuit and the energy storage module.

[0053] When the DC bus enters the discharge state, the air conditioning system main control module controls the bus discharge control switch to connect to the discharge circuit to discharge the DC bus; when the DC bus discharges to the set low voltage state, the air conditioning system main control module controls the bus discharge control switch to connect to the energy storage module, and uses the residual electrical energy of the DC bus to charge the energy storage module to realize the recovery of residual electrical energy.

[0054] The above strategy issues a control command at the same time the air conditioner receives the shutdown command, delaying the disconnection of the AC side control switch. This ensures normal power supply when the air conditioning system's main control module controls the bus discharge control switch, discharge circuit, and energy storage module. When the DC bus enters the discharge state, the control bus discharge control switch is connected to the discharge circuit. When the DC bus discharges to the set low voltage state, the control bus discharge control switch is connected to the energy storage module. This achieves high-voltage discharge to avoid danger and low-voltage energy recovery to reduce waste.

[0055] In practice, if there is still residual energy after the energy storage module is fully charged, it can be dissipated as heat through the resistor in the low-impedance discharge circuit.

[0056] More preferably, the device further includes a bus voltage indicator light, used to indicate the status of the DC bus under the control of the air conditioning system main control module, wherein the status of the DC bus includes high voltage status, discharge status and low voltage status.

[0057] Considering that air conditioner outdoor unit controllers typically perform discharge operations but lack corresponding warning circuits, controller designers and developers have occasionally experienced electric shocks during testing. This invention addresses this by incorporating a bus voltage indicator light to alert the air conditioner outdoor unit controller to residual bus voltage, preventing electric shock and ensuring personnel electrical safety. In practice, since the operating environment of air conditioner outdoor units is generally harsh, the bus voltage indicator light is typically located inside the outdoor unit.

[0058] Generally, the DC bus voltage changes during the start-up and shutdown of a photovoltaic air conditioner are roughly as follows: When the air conditioner is turned on, the DC bus voltage rises and then remains stable (the DC bus voltage of an air conditioner is around 400V); when the air conditioner is turned off, the DC bus voltage discharges, and it generally takes 10-30 seconds for the DC bus voltage to fully release its energy. This invention controls the connection between the bus discharge control switch, the discharge circuit, and the energy storage module after the air conditioner receives a shutdown command. This enables the controller's DC bus to discharge and recover residual energy, achieving high-voltage discharge to avoid danger and low-voltage energy recovery to reduce waste. The discharge circuit and energy storage module can be selected as a low-impedance discharge circuit or a small power storage module. A specific implementation example is given below, combined with the bus voltage indicator light:

[0059] 1) When the air conditioner is running normally and the DC bus voltage is around 400V, the main control module of the air conditioning system will make the bus voltage indicator light red, indicating a high voltage state;

[0060] 2) When the air conditioner receives the shutdown command, the main control module of the air conditioning system disconnects the control switch of the DC bus converter. At the same time as receiving the shutdown command, it sends a command to disconnect the AC side control switch after a 30-second delay. This ensures that the main control module of the air conditioning system has normal power supply when controlling the connection between the bus discharge control switch, the discharge circuit, and the energy storage module during the 30-second delay. It can also collect the bus voltage and control indicator lights normally.

[0061] 3) When the DC bus is in the discharge state, the main control module of the air conditioning system controls the bus discharge switch to connect to the low impedance discharge circuit for discharge, so that the bus voltage indicator light is yellow, indicating the discharge state;

[0062] 4) When the DC bus discharges to the set low voltage of about 36V, the main control module of the air conditioning system controls the bus discharge switch to connect to the small power storage module, so that the DC bus charges this module. The bus voltage indicator light will show a green light, indicating a low voltage state. 36V is a safe voltage that people can touch and is also a common power supply voltage, which can complete the charging of the energy storage device under safe conditions.

[0063] 5) When the discharge time reaches 30 seconds, the main control module of the air conditioning system disconnects the AC power supply, the discharge ends, and the indicator light goes out.

[0064] The above process enables the discharge of the controller's DC bus and the recovery and utilization of residual electrical energy, ensuring the electrical safety of design, maintenance, and other personnel.

[0065] More preferably, a fault signal feedback module with low power consumption and small size is used as an integrated small module of the controller motherboard, and signals are transmitted to the terminal APP via wireless communication. The fault signal feedback module has three operating modes:

[0066] ①Active mode, in a state of being connected to the terminal APP and transmitting data;

[0067] ② Standby mode: The device is connected to the terminal app but does not transmit data.

[0068] ③ Sleep mode, which is in a state where it is not connected to the terminal APP.

[0069] The three modes described above can extend the operating time of the fault signal feedback module and reduce power consumption.

[0070] The strategies for fault information feedback and reporting include:

[0071] (1) When the main control module of the air conditioning system does not detect a controller fault, it controls the fault signal feedback module to be in sleep mode to reduce the power consumption of the module;

[0072] (2) When a controller fault is detected, the fault information is sent to the fault signal feedback module and the fault signal feedback module is controlled to enter the active mode. When the fault signal feedback module is connected to its terminal and data is transmitted, the fault information is fed back to the terminal.

[0073] (3) After the fault signal feedback module completes the fault information feedback in the active mode, it switches to the standby mode and maintains it for a set time, and then switches to the hibernation mode.

[0074] In practice, the switching of the above modes is contingent on the energy storage module having power, i.e., being able to supply power to the fault feedback module. If the energy storage module is out of power, it can be charged by turning the air conditioner on and off.

[0075] Since the energy of the fault signal feedback module comes from the residual electrical energy recovered from the busbar by the energy storage module, to prevent the fault feedback module from being without power, the air conditioning fault investigator can first perform a brief, quick switch-on to charge the energy storage module during fault detection (the residual electrical energy on the busbar after the module is fully charged can be discharged through a low-impedance discharge circuit), ensuring that the module has power and can supply power to the fault signal feedback module. Then, the air conditioner is started, i.e., the detection device is activated and begins fault detection. When a controller fault is detected, the fault information is transmitted to the fault feedback module and sent to the terminal.

[0076] The above operations ensure that the energy storage module is powered and can supply power to the fault signal feedback module. Normally, when users perform such operations, they are only charging the energy storage module and it does not affect normal operation.

[0077] A power detection program can also be added to automatically detect the power supply status of the fault signal feedback module after power-on. If the fault signal feedback module is found to be powered, there is no need to charge the energy storage module by switching the air conditioner on and off.

[0078] Embodiment 2 of the present invention provides a method for fault detection of a photovoltaic air conditioner controller, comprising:

[0079] Obtain health status data of photovoltaic air conditioner controller;

[0080] After the air conditioner receives the shutdown command, it discharges the DC bus of the controller and recovers residual electrical energy.

[0081] The controller fault is detected based on the health status data of the photovoltaic air conditioner controller, and when a controller fault is detected, the residual electrical energy recovered is used to feed back the fault information wirelessly.

[0082] Embodiment 3 of the present invention provides a photovoltaic air conditioner, including the photovoltaic air conditioner controller fault detection device described in Embodiment 1.

[0083] Embodiment 4 of the present invention provides a computer device, the computer device including a processor, the processor being used to implement the fault detection method described in Embodiment 2 when executing a program stored in a memory.

[0084] Embodiment 5 of the present invention provides a readable storage medium on which a program is stored, and when the program is executed by a processor, it implements the fault detection method described in Embodiment 2.

[0085] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0086] This invention detects controller faults based on the health status data of the photovoltaic air conditioner controller. When a fault is detected, it controls a fault signal feedback module located inside the outdoor unit of the air conditioner to wirelessly transmit fault information to an external terminal. This allows for rapid location and confirmation of controller fault information without disassembling the outdoor unit, providing technical support for subsequent repair plans, accelerating the air conditioner maintenance process, and increasing user satisfaction. It is particularly suitable for obtaining controller fault information in complex installation scenarios of air conditioner outdoor units. Simultaneously, after the air conditioner receives a shutdown command, it controls the connection between the bus discharge control switch, the discharge circuit, and the energy storage module. This enables the discharge of the controller's DC bus and the recovery of residual energy, using the recovered residual energy to power the fault signal feedback module and reducing energy waste.

[0087] The health status data of the photovoltaic air conditioner controller obtained by this invention includes bus voltage, IGBT temperature signal, photovoltaic DC voltage, photovoltaic DC current, photovoltaic insulation impedance, grid control switch signal and communication signal, covering the key parameters of the controller's health status, and enabling comprehensive fault detection of the controller.

[0088] This invention issues a control command simultaneously with the air conditioner receiving a shutdown command, delaying the disconnection of the AC side control switch. This ensures normal power supply when the air conditioning system's main control module controls the bus discharge control switch, discharge circuit, and energy storage module. Furthermore, when the DC bus enters a discharge state, the invention connects the bus discharge control switch to the discharge circuit. When the DC bus discharges to a set low-voltage state, the invention connects the bus discharge control switch to the energy storage module. This achieves high-voltage discharge to avoid danger and low-voltage energy recovery to reduce waste.

[0089] This invention, by setting a bus voltage indicator light, can indicate the status of the DC bus, remind the air conditioner outdoor unit controller of the residual bus voltage, avoid electric shock, and ensure the electrical safety of personnel.

[0090] The fault signal feedback module of this invention has active, standby and sleep modes, which can flexibly adapt to different scenarios and are energy-saving and efficient.

[0091] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0092] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0093] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A photovoltaic air conditioner controller fault detection device, comprising a controller monitoring signal acquisition module, an air conditioning system main control module, a bus discharge control switch, a discharge circuit, an energy storage module, and a fault signal feedback module installed inside the outdoor unit of the air conditioner, and a terminal applied to the outside of the outdoor unit of the air conditioner, characterized in that: The controller monitoring signal acquisition module, the bus discharge control switch, and the fault signal feedback module are all connected to the air conditioning system main control module. The controller monitoring signal acquisition module is used to acquire health status data of the photovoltaic air conditioner controller; The main control module of the air conditioning system is used to control the connection status of the bus discharge control switch, the discharge circuit and the energy storage module after the air conditioner receives a shutdown command, so as to realize the discharge of the DC bus of the controller and the recovery of residual energy; it is also used to perform controller fault detection based on the health status data of the photovoltaic air conditioning controller, and when a controller fault is detected, control the fault signal feedback module to feed back the fault information to the terminal in a wireless communication manner. The energy storage module is used to power the fault signal feedback module using the recovered residual electrical energy.

2. The photovoltaic air conditioner controller fault detection device according to claim 1, characterized in that: The health status data of the photovoltaic air conditioning controller includes bus voltage, IGBT temperature signal, photovoltaic DC voltage, photovoltaic DC current, photovoltaic insulation impedance, grid control switch signal, and communication signal.

3. The photovoltaic air conditioner controller fault detection device according to claim 1, characterized in that: The strategy employed by the main control module of the air conditioning system to control the connection between the bus discharge control switch, the discharge circuit, and the energy storage module includes: After the air conditioner receives the shutdown command, the main control module of the air conditioning system disconnects the control switch of the DC bus converter, so that the DC bus enters the discharge state. At the same time as the air conditioner receives the shutdown command, a control command is issued to delay disconnecting the AC side control switch, so as to ensure normal power supply when the main control module of the air conditioning system controls the connection between the bus discharge control switch and the discharge circuit and the energy storage module. When the DC bus enters the discharge state, the air conditioning system main control module controls the bus discharge control switch to connect to the discharge circuit to discharge the DC bus; when the DC bus discharges to the set low voltage state, the air conditioning system main control module controls the bus discharge control switch to connect to the energy storage module, and uses the residual electrical energy of the DC bus to charge the energy storage module to realize the recovery of residual electrical energy.

4. The photovoltaic air conditioner controller fault detection device according to claim 1, characterized in that: The device also includes a bus voltage indicator light, which is used to indicate the status of the DC bus under the control of the air conditioning system main control module. The status of the DC bus includes high voltage status, discharge status and low voltage status.

5. The photovoltaic air conditioner controller fault detection device according to claim 1, characterized in that: The fault signal feedback module includes active, standby, and sleep modes. In active mode, the fault signal feedback module communicates with the terminal and transmits data; in standby mode, it communicates with the terminal but does not transmit data; and in sleep mode, it does not communicate with the terminal.

6. The photovoltaic air conditioner controller fault detection device according to claim 5, characterized in that: When no controller fault is detected, the main control module of the air conditioning system controls the fault signal feedback module to be in sleep mode; when a controller fault is detected, the fault information is sent to the fault signal feedback module and the fault signal feedback module is controlled to enter active mode to feed back the fault information to the terminal; after completing the fault information feedback in active mode, the fault signal feedback module enters standby mode and remains in standby mode for a set time, and then enters sleep mode.

7. A method for detecting faults in a photovoltaic air conditioner controller, implemented based on the photovoltaic air conditioner controller fault detection device according to any one of claims 1-6, characterized in that, The method includes: Obtain health status data of photovoltaic air conditioner controller; After the air conditioner receives the shutdown command, it discharges the DC bus of the controller and recovers residual electrical energy. The controller fault is detected based on the health status data of the photovoltaic air conditioner controller, and when a controller fault is detected, the residual electrical energy recovered is used to feed back the fault information wirelessly.

8. A photovoltaic air conditioner, characterized in that, Including the photovoltaic air conditioner controller fault detection device according to any one of claims 1-6.

9. A computer device, characterized in that: The computer device includes a processor that executes a program stored in a memory to implement the fault detection method according to claim 7.

10. A readable storage medium having a program stored thereon, characterized in that: When the program is executed by the processor, it implements the fault detection method according to claim 7.

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