Proton exchange membrane fuel cell wireless control distributed power generation system

Abstract

The invention relates to a proton exchange membrane fuel cell wireless control distributed power generation system, which comprises a main controller, a hydrogen supply system, an oxygen supply system, an electric pile system, an electric pile cooling system, a main DC / DC converter, an auxiliary cooling system, a lithium iron phosphate battery pack and an inverter, loRa communication modules are arranged in the hydrogen supply system, the oxygen supply system, the electric pile system, the electric pile cooling system, the main DC / DC converter, the auxiliary cooling system, the lithium iron phosphate battery pack and the inverter to serve as LoRa slave machines, all subsystems are managed through LoRa wireless communication by means of the main controller, and a high-voltage-to-low-voltage multi-path isolation DC / DC converter is adopted for supplying power to all the subsystems. Compared with the prior art, the system has the advantages of improving system stability and reliability and arrangement flexibility, being easy to maintain and reducing cost.

Description

Technical Field

[0001] The invention relates to the field of fuel cells, and in particular to a proton exchange membrane fuel cell wireless control distributed power generation system. Background Art

[0002] The existing proton exchange membrane fuel cell distributed power generation system mostly uses wired connections for data and information exchange between systems and subsystems, and between subsystems. This brings several problems. First, it increases the cost of cables. Fuel cell distributed power generation systems generally have more equipment and higher power, occupy a certain ground space, and the distance between equipment is far, so a lot of cables are required; second, there is the interference problem. Too many and too long cables between devices can easily introduce external interference signals, causing the system to malfunction; third, there is the reliability problem. Too many connecting cables will increase a large number of connectors. Any electrical connection failure or cable breakage may cause the system to crash and increase the difficulty of inspection and maintenance; fourth, there is the layout problem. A large number of cable connections will limit the layout area of ​​​​the equipment or subsystem. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a proton exchange membrane fuel cell distributed power generation system with improved system stability and reliability, relatively easy maintenance, flexible layout and reduced cost.

[0004] The purpose of the present invention can be achieved by the following technical solutions: A proton exchange membrane fuel cell wireless control distributed power generation system, comprising a main controller, a hydrogen supply system, an oxygen supply system, a stack system, a stack cooling system, a main DC / DC converter, an auxiliary cooling system, a lithium iron phosphate battery pack, an inverter, a high-voltage to low-voltage multi-channel output isolated DC / DC converter, a hydrogen supply pipeline, an oxygen supply pipeline, a stack cooling pipeline, an auxiliary cooling pipeline, a stack output voltage positive electrode, a stack output voltage negative electrode, a DC lithium battery bus positive electrode, a DC lithium battery bus negative electrode and a three-phase AC output.

[0005] Furthermore, the main controller includes a 4G communication module, a LoRa communication module, a microcontroller module, a 4G antenna, a LoRa antenna, a serial port 1 communication line, a serial port 2 communication line and a 485 communication port.

[0006] Furthermore, the hydrogen supply system includes a hydrogen supply system controller, an H2 high pressure sensor, a pressure regulating valve, an H2 inlet valve, an H2 low pressure sensor, and an H2 pipeline.

[0007] Furthermore, the oxygen supply system includes an oxygen supply system controller, an air compressor controller, an air compressor, an air flow sensor, an air pressure sensor, an air temperature sensor and an air pipeline.

[0008] Furthermore, the stack system includes a stack system controller, a stack, a stack H2 inlet, an H2 concentration sensor, a stack air inlet, a stack coolant inlet, a stack coolant outlet, a stack H2 outlet pipeline, a stack H2 outlet valve, a stack air outlet back pressure valve, and a stack air outlet pipeline.

[0009] Furthermore, the stack cooling system includes a stack cooling system controller, a stack inlet temperature sensor, a stack cooling circuit pressure sensor, a stack outlet temperature sensor, a stack cooling circuit flow sensor, a main water pump, a main radiator, a main fan, and a stack cooling circulation pipeline.

[0010] Furthermore, the DC / DC converter includes a LoRa communication module and a LoRa antenna, and the LoRa antenna is connected to the LoRa communication module.

[0011] Furthermore, the auxiliary cooling system includes an auxiliary cooling system controller, an auxiliary fan, an auxiliary radiator, an auxiliary water pump, an auxiliary cooling circuit pressure sensor, an auxiliary cooling circuit temperature sensor, and an auxiliary cooling circulation pipeline.

[0012] Furthermore, the lithium iron phosphate battery pack includes a LoRa communication module and a LoRa antenna, and the LoRa antenna is connected to the LoRa communication module.

[0013] Furthermore, the inverter includes a LoRa communication module and a LoRa antenna, and the LoRa antenna is connected to the LoRa communication module.

[0014] Furthermore, the high-voltage to low-voltage multi-output isolated DC / DC converter includes a main controller power supply, a hydrogen supply system power supply, an oxygen supply system power supply, a fuel cell system power supply, a fuel cell cooling system power supply, a DC / DC converter power supply, an auxiliary cooling system power supply, a lithium iron phosphate battery pack power supply, and an inverter power supply, which are isolated from the high voltage and each other.

[0015] Furthermore, the hydrogen supply system is connected to the stack system through a hydrogen supply pipeline, the oxygen supply system is connected to the stack system through an oxygen supply pipeline, the stack cooling system is connected to the stack system through a stack cooling pipeline, the DC / DC converter is connected to the auxiliary cooling system and the lithium iron phosphate battery pack through an auxiliary cooling pipeline, the inverter is connected to the auxiliary cooling system and the lithium iron phosphate battery pack through an auxiliary cooling pipeline, the DC / DC converter is connected to the positive electrode of the stack output voltage and the negative electrode of the stack output voltage of the stack system, the positive electrode of the DC bus voltage and the negative electrode of the DC bus voltage are connected to the DC / DC converter, the lithium iron phosphate battery pack, the inverter and the high-voltage to low-voltage multi-channel output isolated DC / DC converter, and the inverter has a three-phase AC 380V / 50Hz output.

[0016] Furthermore, the 4G antenna inside the main controller is connected to the 4G communication module, the LoRa antenna is connected to the LoRa communication module, the microcontroller module is connected to the 4G communication module through the serial port 1 communication line, connected to the LoRa communication module through the serial port 2 communication line, and connected to the 485 communication port.

[0017] Furthermore, the H2 high-pressure sensor, pressure regulating valve, H2 inlet valve, and H2 low-pressure sensor inside the hydrogen supply system are connected to the hydrogen supply system controller through cables, and are connected to each other through H2 pipelines.

[0018] Furthermore, the oxygen supply system controller inside the oxygen supply system is connected to the air compressor controller, the air flow sensor, the air pressure sensor, and the air temperature sensor through cables, the air compressor controller is connected to the air compressor through cables, and the air compressor is connected to the air flow sensor, the air pressure sensor, and the air temperature sensor through air pipelines.

[0019] Furthermore, the stack system controller inside the stack system is connected to the H2 concentration sensor, the stack H2 outlet valve, and the stack air outlet back pressure valve through cables, the H2 concentration sensor is fixed on the stack, and after the stack H2 outlet pipeline is connected to the hydrogen outlet of the stack, it is connected to the outlet end of the stack air outlet exhaust pipe through the stack H2 outlet valve, the stack air outlet back pressure valve is connected between the air outlet of the stack and the stack air outlet exhaust pipe, the stack H2 inlet is connected to the hydrogen supply pipeline, the stack air inlet is connected to the oxygen supply pipeline, and the stack coolant inlet and the stack coolant outlet are respectively connected to the stack cooling pipeline.

[0020] Furthermore, the stack cooling system controller inside the stack cooling system is connected to the stack inlet temperature sensor, the stack cooling circuit pressure sensor, the stack outlet temperature sensor, the stack cooling circuit flow sensor, the main water pump, and the main fan through cables, and the stack inlet temperature sensor, the stack cooling circuit pressure sensor, the stack outlet temperature sensor, the stack cooling circuit flow sensor, the main water pump, and the main radiator are connected to the stack cooling circulation pipeline.

[0021] Furthermore, the auxiliary cooling system controller inside the auxiliary cooling system is connected to the auxiliary fan, auxiliary water pump, auxiliary cooling circuit pressure sensor, and auxiliary cooling circuit temperature sensor through cables, and the auxiliary radiator, auxiliary water pump, auxiliary cooling circuit pressure sensor, and auxiliary cooling circuit temperature sensor are connected to the auxiliary cooling circulation pipeline.

[0022] Furthermore, the hydrogen supply system controller inside the hydrogen supply system includes a LoRa communication module and a LoRa antenna, and the LoRa antenna is connected to the LoRa communication module.

[0023] Furthermore, the oxygen supply system controller inside the oxygen supply system includes a LoRa communication module and a LoRa antenna, and the LoRa antenna is connected to the LoRa communication module.

[0024] Furthermore, the battery stack system controller inside the battery stack system includes a LoRa communication module and a LoRa antenna, and the LoRa antenna is connected to the LoRa communication module.

[0025] Furthermore, the stack cooling system controller inside the stack cooling system includes a LoRa communication module and a LoRa antenna, and the LoRa antenna is connected to the LoRa communication module.

[0026] Furthermore, the auxiliary cooling system controller inside the auxiliary cooling system includes a LoRa communication module and a LoRa antenna, and the LoRa antenna is connected to the LoRa communication module.

[0027] Furthermore, the LoRa communication module inside the main controller acts as the LoRa host, and other LoRa communication modules act as LoRa slaves. Each subsystem controller transmits data bidirectionally with the LoRa host of the main controller through the LoRa slave, thereby realizing the main controller's parameter monitoring and control of the subsystem.

[0028] Compared with the prior art, the beneficial effects are: The wired communication connection control mode of the traditional proton exchange membrane fuel cell distributed power generation system has been effectively improved and changed to the connection mode of LoRa wireless communication. LoRa technology uses spread spectrum modulation technology, which allows a wider bandwidth to be occupied in the spectrum, so it can work in a noisy wireless environment and coexist with other wireless devices. It can still achieve reliable communication under weak signals, thereby greatly improving the reliability and anti-interference ability of communication. It also has low power consumption, long transmission distance, and low cost, saving a lot of cable and connector costs, including procurement costs, assembly and maintenance costs, and greatly reducing problems caused by poor contact or disconnection, improving system reliability.

[0029] The fuel cell distributed power generation system is divided into different subsystems according to its functional characteristics. Each subsystem function is implemented by a controller with LoRa wireless communication function and a LoRa slave, which receives instructions from the main controller and LoRa host and transmits data to the LoRa host. The LoRa host realizes the overall function of the system through the coordinated management of the LoRa slaves, and has the function of connecting to the Internet through 4G signals, so it is easier to play the function of the subsystem, and the system space layout is more flexible and convenient.

[0030] Different subsystems are powered by power supplies that are isolated from each other and from high voltage. This achieves complete electrical isolation between subsystems and from the high voltage system in both the power supply and signal links. The interference introduced by long wires is greatly reduced, greatly enhancing the system's anti-interference ability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The overall structure diagram of the proton exchange membrane fuel cell wireless control distributed power generation system according to the present invention. Among them, 1: main controller, 2: hydrogen supply system, 3: oxygen supply system, 4: battery stack system, 5: battery stack cooling system, 6: DC / DC converter, 7: auxiliary cooling system, 8: lithium iron phosphate battery pack, 9: inverter, 10: Hydrogen supply pipeline, 11: oxygen supply pipeline, 12 / 13: stack cooling pipeline, 14 / 15 / 16 / 17: auxiliary cooling pipeline, 18: stack output voltage positive pole, 19: stack output voltage negative pole, 20: DC lithium battery bus positive pole, 21: DC lithium battery bus negative pole, 22: three-phase AC 380V-50Hz, 23: high-voltage to low-voltage multi-channel output isolated DC / DC converter, 24: main controller power supply, 25: hydrogen supply system power supply, 26: oxygen supply system power supply, 27: stack system power supply, 28: stack cooling system power supply, 29: main DC / DC converter power supply, 30: auxiliary cooling system power supply, 31: lithium iron phosphate battery pack power supply, 32: inverter power supply, 100: main controller LoRa communication module, 101: main controller LoRa antenna, 102: supply Hydrogen system LoRa communication module, 103: Hydrogen supply system LoRa antenna, 104: Oxygen supply system LoRa communication module, 105: Oxygen supply system LoRa antenna, 106: Fuel cell system LoRa communication module, 107: Fuel cell system LoRa antenna, 108: Fuel cell cooling system LoRa communication module, 109: Fuel cell cooling system LoRa antenna, 110: DC / DC converter LoRa communication module, 111: DC / DC converter LoRa antenna, 112: Auxiliary cooling system LoRa communication module, 113: Auxiliary cooling system LoRa antenna, 114: Lithium iron phosphate battery pack LoRa communication module, 115: Lithium iron phosphate battery pack LoRa antenna, 116: Inverter LoRa communication module, 117: Inverter LoRa antenna.

[0032] Figure 2 The main controller structure diagram of the proton exchange membrane fuel cell wireless control distributed power generation system according to the present invention is shown in FIG. 33: 4G antenna, 35: 4G communication module, 37: serial port 1 communication line, 38: serial port 2 communication line, 39: MCU microcontroller, 40: 485 communication port, 100: LoRa communication module, and 101: LoRa antenna.

[0033] Figure 3 The structure diagram of the hydrogen supply system of the proton exchange membrane fuel cell wireless control distributed power generation system according to the present invention is shown in FIG. 41: hydrogen supply system controller, 44: H2 high pressure sensor, 45: pressure regulating valve, 46: H2 inlet valve, 47: H2 low pressure sensor, 48: H2 pipeline, 102: LoRa communication module, and 103: LoRa antenna.

[0034] Figure 4 The oxygen supply system structure diagram of the proton exchange membrane fuel cell wireless control distributed power generation system according to the present invention, wherein 49: oxygen supply system controller, 52: air compressor controller, 53: air compressor, 54: air flow sensor, 55: air pressure sensor, 56: air temperature sensor, 57: air pipeline, 104: LoRa communication module, 105: LoRa antenna.

[0035] Figure 5 The structure diagram of the stack system of the wireless control distributed power generation system of the proton exchange membrane fuel cell according to the present invention. Among them, 58: stack system controller, 61: stack, 62: stack H2 inlet, 63: H2 concentration sensor, 64: stack air inlet, 65: stack coolant inlet, 66: stack coolant outlet, 67: stack H2 outlet pipeline, 68: stack H2 outlet valve, 69: stack air outlet back pressure valve, 70: stack air outlet exhaust pipe, 106: LoRa communication module, 107: LoRa antenna.

[0036] Figure 6 The structure diagram of the stack cooling system of the proton exchange membrane fuel cell wireless control distributed power generation system according to the present invention. Among them, 71: stack cooling system controller, 74: stack inlet temperature sensor, 75: stack cooling circuit pressure sensor, 76: stack outlet temperature sensor, 77: stack cooling circuit flow sensor, 78: main water pump, 79: main radiator, 80: main fan, 81: stack cooling circulation pipeline, 108: LoRa communication module, 109: LoRa antenna.

[0037] Figure 7 The auxiliary cooling system structure diagram of the proton exchange membrane fuel cell wireless control distributed power generation system according to the present invention, wherein 82: auxiliary cooling system controller, 83: auxiliary fan, 84: auxiliary radiator, 85: auxiliary water pump, 86: auxiliary cooling circuit pressure sensor, 87: auxiliary cooling circuit temperature sensor, 88: auxiliary cooling circulation pipeline, 112: LoRa communication module, 113: LoRa antenna. DETAILED DESCRIPTION

[0038] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0039] like Figure 1 As shown, the present invention provides a proton exchange membrane fuel cell wireless control distributed power generation system, including a main controller 1, a hydrogen supply system 2, an oxygen supply system 3, a stack system 4, a stack cooling system 5, a main DC / DC converter 6, an auxiliary cooling system 7, a lithium iron phosphate battery pack 8, an inverter 9, a high-voltage to low-voltage multi-channel output isolation DC / DC converter 23, a hydrogen supply pipeline 10, an oxygen supply pipeline 11, a stack cooling pipeline 12-13, an auxiliary cooling pipeline 14-15-16-17, a stack output voltage positive electrode 18, a stack output voltage negative electrode 19, a DC lithium battery bus positive electrode 20, a DC lithium battery bus negative electrode 21 and a three-phase AC output 22. The DC / DC converter 6 includes a LoRa communication module 110 and a LoRa antenna 111, the lithium iron phosphate battery pack 8 includes a LoRa communication module 114 and a LoRa antenna 115, and the inverter 9 includes a LoRa communication module 116 and a LoRa antenna 117. The high-voltage to low-voltage multi-channel output isolation DC / DC converter 23 has multiple mutually isolated subsystem power supplies 24 to 32 that are input through high-voltage isolation and then output. The interconnection of each subsystem is shown in this figure.

[0040] like Figure 2 As shown, the main controller 1 includes a 4G communication module 35, a LoRa communication module 100, a microcontroller module 39, a 4G antenna 33, a LoRa antenna 101, a serial port 1 communication line 37, a serial port 2 communication line 38 and a 485 communication port 40, which are connected according to this figure.

[0041] like Figure 3 As shown, the hydrogen supply system 2 includes a hydrogen supply system controller 41, an H2 high-pressure sensor 44, a pressure regulating valve 45, an H2 inlet valve 46, an H2 low-pressure sensor 47, and an H2 pipeline 48, wherein the hydrogen supply system controller includes a LoRa communication module 102 and a LoRa antenna 103, and the high-pressure sensor, the pressure regulating valve, the H2 inlet valve, and the H2 low-pressure sensor are connected to the hydrogen supply system controller through cables, and are connected to each other through the H2 pipeline.

[0042] like Figure 4 As shown, the oxygen supply system 3 includes an oxygen supply system controller 49, an air compressor controller 52, an air compressor 53, an air flow sensor 54, an air pressure sensor 55, an air temperature sensor 56, and an air pipeline 57, wherein the oxygen supply system controller includes a LoRa communication module 104 and a LoRa antenna 105. The oxygen supply system controller is connected to the air compressor controller, the air flow sensor, the air pressure sensor, and the air temperature sensor through cables, the air compressor controller is connected to the air compressor through cables, and the air compressor is connected to the air flow sensor, the air pressure sensor, and the air temperature sensor through air pipelines.

[0043] like Figure 5 As shown, the stack system 4 includes a stack system controller 58, a stack 61, a stack H2 inlet 62, an H2 concentration sensor 63, a stack air inlet 64, a stack coolant inlet 65, a stack coolant outlet 66, a stack H2 outlet pipeline 67, a stack H2 outlet valve 68, a stack air outlet back pressure valve 69, and a stack air outlet pipeline 70, wherein the stack system controller 58 includes a LoRa communication module 106 and a LoRa antenna 107. The stack system controller is connected to the H2 concentration sensor, the stack H2 outlet valve, and the stack air outlet back pressure valve through cables. The H2 concentration sensor is fixed on the stack. After the stack H2 outlet pipeline is connected to the hydrogen outlet of the stack, it is connected to the outlet end of the stack air outlet exhaust pipe through the stack H2 outlet valve. The stack air outlet back pressure valve is connected between the air outlet of the stack and the stack air outlet exhaust pipe. The stack H2 inlet is connected to the hydrogen supply pipeline, the stack air inlet is connected to the oxygen supply pipeline, and the stack coolant inlet and the stack coolant outlet are respectively connected to the stack cooling pipeline.

[0044] like Figure 6 As shown, the stack cooling system 5 includes a stack cooling system controller 71, a stack inlet temperature sensor 74, a stack cooling circuit pressure sensor 75, a stack outlet temperature sensor 76, a stack cooling circuit flow sensor 77, a main water pump 78, a main radiator 79, a main fan 80, and a stack cooling circulation pipeline 81, wherein the stack cooling system controller 71 includes a LoRa communication module 108 and a LoRa antenna 109. The stack cooling system controller is connected to the stack inlet temperature sensor, the stack cooling circuit pressure sensor, the stack outlet temperature sensor, the stack cooling circuit flow sensor, the main water pump, and the main fan through cables, and the stack inlet temperature sensor, the stack cooling circuit pressure sensor, the stack outlet temperature sensor, the stack cooling circuit flow sensor, the main water pump, and the main radiator are connected to the stack cooling circulation pipeline.

[0045] like Figure 7 As shown, the auxiliary cooling system 7 includes an auxiliary cooling system controller 82, an auxiliary fan 83, an auxiliary radiator 84, an auxiliary water pump 85, an auxiliary cooling circuit pressure sensor 86, an auxiliary cooling circuit temperature sensor 87, and an auxiliary cooling circulation pipeline 88. The auxiliary cooling system controller 82 includes a LoRa communication module 112 and a LoRa antenna 113. The auxiliary cooling system controller is connected to the auxiliary fan, the auxiliary water pump, the auxiliary cooling circuit pressure sensor, and the auxiliary cooling circuit temperature sensor through cables, and the auxiliary radiator, the auxiliary water pump, the auxiliary cooling circuit pressure sensor, and the auxiliary cooling circuit temperature sensor are connected to the auxiliary cooling circulation pipeline.

[0046] The working principle of the present invention is: After the microcontroller module 39 inside the main controller 1 receives the power-on or power-off instructions issued by the host computer through the 485 communication port 40, it sends the system power-on or power-off process to the LoRa communication module 100 through the serial port 2 communication line 38. The LoRa communication module 100 acts as a LoRa host, modulates the instructions from the microcontroller module into LoRa signals and sends them to each subsystem through the LoRa antenna 101, and sets the output power during operation. Through the polling of the main controller 1, the relevant parameters of each subsystem are transmitted back through each LoRa slave via LoRa wireless communication, so as to monitor the status of each subsystem. The emergency shutdown command caused by a fault or abnormality is determined by the abnormal parameters sent by each subsystem 2 to 9 to the main controller 1. The microcontroller module 39 communicates with the 4G wireless communication module 35 through the serial port 1 communication line 37, and then connects to the Internet through the 4G antenna 33 to realize the Internet remote monitoring function, and connects to the host computer through the 485 port 40, and uses the host computer to realize the system startup, shutdown, output power and other parameter settings, data recording and analysis, fault detection, debugging and maintenance and real-time monitoring functions.

[0047] After receiving the operation instruction from the main controller 1 through the LoRa antenna 103 and the LoRa communication module 102, the internal controller 41 of the hydrogen supply system 2 opens the H2 inlet valve 46 and the pressure regulating valve 45, and supplies hydrogen to the fuel cell system 4 through the H2 pipeline 48. The high-pressure sensor 44 checks the remaining amount of the H2 source, and the sub-controller 41 uploads the relevant parameters of the hydrogen supply system to the main controller 1 through the LoRa communication module 102 and the LoRa antenna 103, and adjusts the opening of the pressure regulating valve 45 by PID adjustment according to the difference between the reading value of the low-pressure sensor 47 and the set value, so as to achieve precise control of the H2 pressure entering the stack. After receiving the shutdown instruction through the LoRa antenna and the LoRa communication module, the sub-controller 41 closes the inlet valve 46 and the pressure regulating valve 45.

[0048] After the internal controller 49 of the oxygen supply system 3 receives the operating instructions from the main controller 1 through the LoRa antenna 105 and the LoRa communication module 104, the air compressor 53 is started to operate through the air compressor controller 52, and oxygen is supplied to the fuel cell system 4 through the oxygen supply pipeline 57. The air flow sensor 54, the air pressure sensor 55, and the air temperature sensor 56 monitor the air path parameters and upload them to the main controller 1 through the LoRa communication module 104 and the LoRa antenna 105. The controller 49 then adjusts the speed of the air compressor 53 in real time according to the power setting parameters issued by the main controller 1, and shuts down the air compressor 53 after receiving the shutdown command issued.

[0049] After the internal controller 71 of the stack cooling system 5 receives the operation instruction from the main controller 1 through the LoRa antenna 109 and the LoRa communication module 108, the main water pump 78 is turned on, and the coolant flows internally between the stack system 4, the circulation pipeline 81, the radiator 79 and the main water pump. The stack inlet temperature sensor 74, the stack outlet temperature sensor 76, the stack cooling circuit pressure sensor 75, and the stack cooling circuit flow sensor 77 monitor the cooling circuit parameters and transmit them to the main controller 1 through the LoRa communication module 108 and the LoRa antenna 109 of the controller 71. When the temperature is too high, the controller 71 increases the speed of the main fan 80 through PID regulation, and reduces the speed when the temperature is low to ensure that the temperature of the stack is within the appropriate range. If the stack cooling circuit leaks or the liquid stagnates, the main controller 1 can judge by the pressure and flow parameters and issue a shutdown command through LoRa communication in time. After receiving any shutdown command, the controller 71 shuts down the main water pump 78 and the main fan 80.

[0050] The auxiliary cooling system 7 is used to cool the main DC / DC converter 6, the lithium iron phosphate battery pack 8, and the inverter 9. After the controller 82 receives the operation instruction of the main controller 1 through the LoRa antenna 113 and the LoRa communication module 112, the auxiliary water pump 85 is turned on. The coolant forms a loop through the cooling pipes 14, 15, 16, 17, 88 and the radiator 84. At the same time, the controller 82 transmits the parameters of the auxiliary cooling system pressure sensor 86 and the temperature sensor 87 to the main controller 1 through LoRa communication, and controls the speed of the auxiliary fan 83 according to the temperature value to ensure that the temperature does not exceed the limit. The main controller 1 determines whether there is a leakage or liquid stagnation fault in the circuit according to the pressure value. When the controller 82 receives the shutdown instruction of the main controller 1 through LoRa communication, the auxiliary water pump 85 and the auxiliary fan 83 are turned off.

[0051] The controller 58 of the stack system 4 receives the data of the H2 concentration sensor 63 and transmits it to the main controller 1 through the LoRa communication module 106 and the LoRa antenna 107. The main controller 1 determines whether there is a H2 leakage accident in the system based on the hydrogen concentration data. The main controller 1 sends an operation command through LoRa communication. After the controller 58 receives the command through LoRa communication, it periodically controls the opening and closing of the outlet valve 68 on the stack H2 outlet pipeline 67, so that the water of the reaction additives on the H2 side of the stack can be discharged in time through the stack air outlet exhaust pipe 70. The function of the back pressure valve 69 at the air outlet end is to adjust the air flow. The H2 inlet end 62 of the stack 61 is used to connect the hydrogen supply pipeline, the air inlet end 64 is connected to the oxygen supply pipeline, and the coolant inlet and outlet ends 65 and 66 are connected to the stack cooling pipeline.

[0052] The main DC / DC converter 6 operates in the current control mode, the positive and negative electrodes 18 and 19 of the battery stack are connected to its input end, and the output end is connected to the DC lithium battery bus. The voltage between the positive electrode 19 and the negative electrode 20 of the bus is determined by the lithium iron phosphate battery pack 8. The output power value is sent by the main controller 1 through the LoRa communication module 100 and the LoRa antenna 101. The main DC / DC converter 6 controls the power output after receiving it through the LoRa communication module 110 and the LoRa antenna 111, and uploads the input and output voltage and current and other parameters to the main controller 1 through LoRa communication.

[0053] The BMS parameters of the lithium iron phosphate battery pack 8 are transmitted to the main controller 1 through the internal LoRa communication module 114 and the LoRa antenna 115 to determine its working status and receive the command issued by the main controller 1 to turn on / off the lithium battery output.

[0054] The inverter 9 converts the DC voltage at the input terminals 20 and 21 into a three-phase AC 380V / 50Hz mains voltage 22 to supply the AC load, and its electrical parameters are transmitted to the main controller 1 through the internal LoRa communication module 116 and the LoRa antenna 117.

[0055] In order to further improve the anti-interference and stability of the system, the above subsystems must be isolated from the high voltage and from each other to ensure complete electrical isolation. For this purpose, a high-voltage to low-voltage multi-channel output isolated DC / DC converter 23 is used, and its high-voltage end 20 and 21 input from the lithium iron phosphate battery pack 8 generate a total of nine low-voltage power supplies 24 to 32 that are isolated from each other and isolated from the high-voltage input, including 24-main controller power supply, 25-hydrogen supply system power supply, 26-oxygen supply system power supply, 27-fuel cell system power supply, 28-fuel cell cooling system power supply, 29-main DC / DC converter power supply, 30-auxiliary cooling system power supply, 31-lithium iron phosphate battery pack power supply, and 32-inverter power supply, which are supplied to their respective subsystems.

[0056] The LoRa network is set to point-to-point master-slave mode, the main controller 1 is set to the LoRa host, and subsystems 2 to 9 are set to LoRa slaves with different addresses. A private protocol is used, and the host polls the slaves. When the response from the slave times out or the software verification fails, it can be regarded as a LoRa communication failure. The data processing capability, anti-interference and transmission distance of LoRa communication can meet the control requirements of the proton exchange membrane fuel cell distributed power generation system.

[0057] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any staff familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A proton exchange membrane fuel cell wireless control distributed power generation system, characterized in that: The invention comprises a main controller (1), a hydrogen supply system (2), an oxygen supply system (3), a stack system (4), a stack cooling system (5), a main DC / DC converter (6), an auxiliary cooling system (7), a lithium iron phosphate battery pack (8), an inverter (9), a high-voltage to low-voltage multi-channel output isolated DC / DC converter (23), a hydrogen supply pipeline (10), an oxygen supply pipeline (11), a stack cooling pipeline (12) (13), an auxiliary cooling pipeline (14) (15) (16) (17), A stack output voltage positive electrode (18), a stack output voltage negative electrode (19), a DC lithium battery bus positive electrode (20), a DC lithium battery bus negative electrode (21) and a three-phase AC output (22), wherein the main controller (1) includes a 4G communication module (35), a LoRa communication module (100), a microcontroller module (39), a 4G antenna (33), a LoRa antenna (101), a serial port 1 communication line (37), a serial port 2 communication line (38) and a 485 communication port (40).

2. A proton exchange membrane fuel cell wireless control distributed power generation system according to claim 1, characterized in that: The hydrogen supply system (2) comprises a hydrogen supply system controller (41), an H2 high pressure sensor (44), a pressure regulating valve (45), an H2 inlet valve (46), an H2 low pressure sensor (47), and an H2 pipeline (48); the oxygen supply system (3) comprises an oxygen supply system controller (49), an air compressor controller (52), an air compressor (53), an air flow sensor (54), an air pressure sensor (55), an air temperature sensor (56), and an air pipeline (57).

3. A proton exchange membrane fuel cell wireless control distributed power generation system according to claim 1, characterized in that: The stack system (4) comprises a stack system controller (58), a stack (61), a stack H2 inlet (62), an H2 concentration sensor (63), a stack air inlet (64), a stack coolant inlet (65), a stack coolant outlet (66), a stack H2 outlet pipeline (67), a stack H2 outlet valve (68), a stack air outlet back pressure valve (69), and a stack air outlet pipeline (70); the stack cooling system (5) comprises a stack cooling system controller (71), a stack inlet temperature sensor (74), a stack cooling circuit pressure sensor (75), a stack outlet temperature sensor (76), a stack cooling circuit flow sensor (77), a main water pump (78), a main radiator (79), a main fan (80), and a stack cooling circulation pipeline (81).

4. A proton exchange membrane fuel cell wireless control distributed power generation system according to claim 1, characterized in that: The DC / DC converter (6) internally comprises a LoRa communication module (110) and a LoRa antenna (111), and the LoRa antenna (111) is connected to the LoRa communication module (110); the lithium iron phosphate battery pack (8) internally comprises a LoRa communication module (114) and a LoRa antenna (115), and the LoRa antenna (115) is connected to the LoRa communication module (114); the inverter (9) internally comprises a LoRa communication module (116) and a LoRa antenna (117), and the LoRa antenna (117) is connected to the LoRa communication module (116).

5. A proton exchange membrane fuel cell wireless control distributed power generation system according to claim 1, characterized in that: The 4G antenna (33) inside the main controller (1) is connected to the 4G communication module (35), the LoRa antenna (101) is connected to the LoRa communication module (100), the microcontroller module (39) is connected to the 4G communication module (35) via the serial port 1 communication line (37), is connected to the LoRa communication module (100) via the serial port 2 communication line (38), and is connected to the 485 communication port (40).

6. According to claim 1, the hydrogen supply system controller (41) inside the hydrogen supply system (2) includes a LoRa communication module (102) and a LoRa antenna (103), and the LoRa antenna (103) is connected to the LoRa communication module (102); the oxygen supply system controller (49) inside the oxygen supply system (3) includes a LoRa communication module (104) and a LoRa antenna (105), and the LoRa antenna (105) is connected to the LoRa communication module (104).

7. The stack system controller (58) inside the stack system (4) according to claim 1 comprises a LoRa communication module (106) and a LoRa antenna (107), and the LoRa antenna (107) is connected to the LoRa communication module (106).

8. The stack cooling system controller (71) inside the stack cooling system (5) according to claim 1 comprises a LoRa communication module (108) and a LoRa antenna (109), and the LoRa antenna (109) is connected to the LoRa communication module (108).

9. The auxiliary cooling system controller (82) inside the auxiliary cooling system (7) according to claim 1 comprises a LoRa communication module (112) and a LoRa antenna (113), and the LoRa antenna (113) is connected to the LoRa communication module (112).

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