A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer

Abstract

This invention relates to the field of photovoltaic renewable energy hydrogen production technology, specifically to a pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer. The structure includes a main controller, a variable frequency water supply unit, a dual-tank switching water supply unit, a multi-parameter online water quality monitoring component, a condensate recovery and pretreatment unit, and an emergency water supply unit. The main controller integrates a photovoltaic output prediction module, which collects real-time output data from an external photovoltaic power station via a data interface and generates a prediction signal. This invention provides a pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer, offering advantages such as adaptive photovoltaic output linkage water supply, real-time multi-parameter water quality monitoring and automatic water supply switching, and closed-loop condensate recovery and utilization. This effectively improves the stability and reliability of the water supply system, reduces water consumption, and extends the service life of the electrolyzer.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic renewable energy hydrogen production technology, specifically to a pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer. Background Technology

[0002] As is well known, photovoltaic renewable energy hydrogen production is the core technology route for achieving large-scale green hydrogen production. Hydrogen production is achieved by using distributed photovoltaic power stations to drive alkaline electrolyzers to electrolyze water, which can achieve zero carbon emissions throughout the process. It has been applied in multiple industrial demonstration projects. Pure water is the core reaction raw material for the electrolyzer, and the stability of its supply and the purity of the water directly determine the electrolysis efficiency, hydrogen purity, and the service life of the electrolyzer.

[0003] Currently, existing photovoltaic power output is highly intermittent and random, affected by sunlight, weather, and seasons, resulting in significant fluctuations in output. This leads to frequent and large-scale adjustments to the electrolyzer load. Existing pure water supply systems mostly use fixed-frequency pumps or single-parameter frequency conversion control based solely on outlet pressure, which cannot match the load changes of the electrolyzer in advance. The large fluctuations in water supply pressure and flow rate easily lead to a decrease in the gas-liquid separation effect of the electrolyzer and a reduction in hydrogen purity. In severe cases, it can cause local dry burning of the electrolyzer plates, accelerate plate corrosion, and shorten equipment life. At the same time, existing systems mostly rely on manual periodic sampling and testing of water quality, which has a long testing cycle and a large lag, making it impossible to monitor key parameters of pure water in real time. Substandard pure water entering the electrolyzer will cause electrolyte contamination and plate passivation, which in turn leads to a decrease in electrolysis efficiency and an increase in energy consumption. A large amount of condensate generated at the electrolyzer cathode is not effectively recycled, resulting in serious waste of water resources. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer. It features adaptive linkage water supply based on photovoltaic output, real-time monitoring of multiple water quality parameters and automatic water supply switching, and closed-loop utilization of condensate recovery. This structure effectively improves the stability and reliability of the water supply system, reduces water consumption, and extends the service life of the electrolyzer.

[0005] (II) Technical Solution The above-mentioned technical objective of this invention is achieved through the following technical solution: a pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer, comprising a main controller, a variable frequency water supply unit, a dual-tank switching water supply unit, a multi-parameter online water quality monitoring component, a condensate recovery and pretreatment unit, and an emergency water supply unit. The main controller integrates a photovoltaic output prediction module, which is used to collect real-time output data from an external photovoltaic power station via a data interface and generate a prediction signal. The output terminal of the main controller is electrically connected to the control terminal of the variable frequency water supply unit. The inlet terminal of the dual-tank switching water supply unit is connected to the outlet terminal of the variable frequency water supply unit and the condensate recovery and pretreatment unit, respectively. The outlet of the water recycling pretreatment unit and the outlet of the emergency water supply unit are connected. The outlet of the dual-tank switching water supply unit is used to connect with the pure water inlet of the external electrolysis cell. The multi-parameter online water quality monitoring component is respectively installed on the main outlet pipe of the dual-tank switching water supply unit and the outlet of the condensate recycling pretreatment unit. The signal output of the multi-parameter online water quality monitoring component is electrically connected to the input of the main controller. The output of the main controller is electrically connected to the control of the dual-tank switching water supply unit. The output of the main controller is electrically connected to the control of the condensate recycling pretreatment unit. The control of the emergency water supply unit is electrically connected to the output of the main controller.

[0006] The above technical solution involves setting up a main controller, a photovoltaic output prediction module, a variable frequency water supply unit, and a dual-tank switching water supply unit. The photovoltaic output prediction module establishes a data connection with the external photovoltaic power station, collects real-time sunlight and output data, generates a trend prediction signal for photovoltaic output changes, and transmits this signal to the input of the main controller. The output of the main controller is electrically connected to the control terminal of the variable frequency water supply unit. Based on the received photovoltaic output prediction signal, the main controller adjusts the operating status of the variable frequency water supply unit in advance, ensuring that the water supply flow matches the load changes of the electrolyzer under photovoltaic output fluctuations, thus avoiding a mismatch between the water supply flow and the actual needs of the electrolyzer. The pure water output from the variable frequency water supply unit is temporarily stored and buffered inside the dual-tank switching water supply unit. The dual-tank switching water supply unit can achieve alternating water storage and supply operations, stably outputting pure water and delivering it to the external electrolyzer, alleviating the problems of water supply pressure and flow fluctuations caused by photovoltaic output fluctuations, and ensuring the continuity and stability of pure water supply to the electrolyzer. This is further enhanced by setting up multi-parameter online water quality monitoring components, a condensate recovery pretreatment unit, and an emergency water supply unit. Multi-parameter online water quality monitoring components are deployed at two locations: the main outlet pipe of the dual-tank switching water supply unit and the outlet of the condensate recovery and pretreatment unit. These components monitor the quality of the pure water output from the dual-tank switching water supply unit and the quality of the condensate after treatment by the condensate recovery and pretreatment unit in real time, feeding the water quality detection signals back to the input of the main controller. The main controller controls the operation of the dual-tank switching water supply unit and the condensate recovery and pretreatment unit based on the water quality signals, intercepting and disposing of substandard water, supplying only compliant pure water to the electrolyzer. The condensate recovery and pretreatment unit collects and purifies the condensate generated at the cathode of the electrolyzer through multiple stages. The main controller controls the flow direction of the treated water based on the water quality detection signal at its outlet, achieving the recycling of qualified water and reducing water waste. The emergency water supply unit stores pure water in advance. When an anomaly occurs in the system's regular water supply path, the main controller activates the emergency water supply unit to replenish pure water to the dual-tank switching water supply unit. This, combined with the main controller's overall control of all units, ensures the continuous and stable operation of the entire pure water supply system.

[0007] The present invention is further configured such that: the variable frequency water supply unit includes at least two variable frequency pump sets connected in parallel, a main inlet valve, a main outlet valve, a pressure sensor, and a flow sensor; the main inlet valve is located on the main inlet pipe of the variable frequency water supply unit and is used to control the total intake of external pure water; each variable frequency pump set has an independent control valve at its inlet and outlet to realize independent start-up, shutdown, and maintenance switching of a single variable frequency pump set; the main outlet valve is located on the main outlet pipe of the variable frequency water supply unit and is used to control the total output of the variable frequency water supply unit; the pressure sensor and the flow sensor are both located on the main outlet pipe downstream of the main outlet valve, and the signal output terminals of the pressure sensor and the flow sensor are both electrically connected to the input terminal of the main controller.

[0008] Using the above technical solution, by setting up a variable frequency water supply unit, external pure water first enters the system through the main inlet valve set on the main inlet pipe, and then is distributed to at least two variable frequency pump sets set in parallel. The independent control valves at the inlet and outlet of each variable frequency pump set can be opened and closed individually, realizing the start-up, shutdown and maintenance switching of a single pump set. The pure water output by the variable frequency pump set passes through the main outlet valve set on the main outlet pipe. Pressure sensors and flow sensors set on the main outlet pipe downstream of the main outlet valve collect the pressure and flow data of the water supply in real time and transmit the signals to the main controller.

[0009] The present invention is further configured such that: the dual-tank switching water supply unit includes a first pure water tank, a second pure water tank, a first inlet valve, a second inlet valve, a first outlet valve, a second outlet valve, a level sensor, and an outlet pump. The level sensor is respectively disposed on the top of the first pure water tank and the second pure water tank. The sensing end of the level sensor penetrates through the top of the first pure water tank and the second pure water tank and extends into the interior. The signal output end of the level sensor is electrically connected to the input end of the main controller. The first inlet valve, the second outlet valve, the first outlet ... Two inlet valves are respectively installed on the top inlet pipes of the first pure water tank and the second pure water tank, and both the first and second inlet valves are connected to the main outlet pipe of the variable frequency water supply unit. The first and second outlet valves are respectively installed on the bottom outlet pipes of the first and second pure water tanks. The outlet pump is installed on the main outlet pipe of the dual-tank switching water supply unit. The outlet end of the outlet pump is used to connect to the pure water inlet of the external electrolytic cell, and the control end of the outlet pump is electrically connected to the main controller.

[0010] Using the above technical solution, by setting up a dual-tank switching water supply unit, the pure water output by the variable frequency water supply unit enters the corresponding first or second pure water tank for temporary storage through the first and second inlet valves set on the top inlet pipes of the first and second pure water tanks, respectively. The liquid level sensor set on the top of the two pure water tanks and whose sensing end extends into the tank detects the liquid level in the tank in real time and transmits the signal to the main controller. The pure water flows out from the first and second outlet valves set on the outlet pipes at the bottom of the two pure water tanks and flows into the main outlet pipe of the dual-tank switching water supply unit. The water is then transported to the pure water inlet of the external electrolytic cell by the outlet pump set on the main outlet pipe.

[0011] The present invention is further configured such that: the multi-parameter online water quality monitoring component includes a conductivity sensor, a hardness sensor, a dissolved oxygen sensor, and a pH sensor; the conductivity sensor, hardness sensor, dissolved oxygen sensor, and pH sensor are respectively installed on the outlet main pipe of the dual-tank switching water supply unit and the outlet end of the condensate recovery pretreatment unit; the multi-parameter online water quality monitoring component on the outlet main pipe of the dual-tank switching water supply unit is used to monitor the pure water quality entering the external electrolysis cell; and the multi-parameter online water quality monitoring component at the outlet end of the condensate recovery pretreatment unit is used to monitor the water quality of the recovered condensate.

[0012] By adopting the above technical solution, a multi-parameter online water quality monitoring component is set up. This component consists of a conductivity sensor, a hardness sensor, a dissolved oxygen sensor, and a pH sensor. One set of conductivity, hardness, dissolved oxygen, and pH sensors is arranged on the outlet main pipe of the dual-tank switching water supply unit to collect various water quality parameters of the pure water about to enter the external electrolyzer in real time. Another set of conductivity, hardness, dissolved oxygen, and pH sensors is arranged at the outlet of the condensate recovery pretreatment unit to collect various water quality parameters of the treated recovered condensate in real time. The water quality signals collected by both sets of sensors are transmitted to the main controller. The main controller controls the operation status of the corresponding water supply unit and recovery unit according to the received water quality signals to ensure that the pure water entering the electrolyzer and the recovered condensate meet the requirements.

[0013] The present invention is further configured such that: the condensate recovery pretreatment unit includes a condensate collection tank, an automatic condensate pump, a precision filter, an ion exchange column, an ultraviolet sterilizer, a three-way regulating valve, a pure water return pipe, an outlet pipe, and a discharge valve; the inlet of the condensate collection tank is connected to the cathode condensate outlet of an external electrolytic cell; the inlet of the automatic condensate pump is connected to the bottom outlet of the condensate collection tank; the outlet of the automatic condensate pump is connected to the inlet of the precision filter; the outlet of the precision filter is connected to the inlet of the ion exchange column; and the outlet of the ion exchange column is connected to the inlet of the ultraviolet sterilizer. The ultraviolet sterilizer's outlet is connected to the three-way regulating valve's inlet. The conductivity sensor, hardness sensor, dissolved oxygen sensor, and pH sensor are all installed on the side wall of the pipe between the ultraviolet sterilizer's outlet and the three-way regulating valve's inlet, with each sensor's sensing end extending into the pipe and directly contacting the water flow. The three-way regulating valve's first outlet is connected to the pure water return pipe's inlet, and the pure water return pipe's outlet is connected to the top inlet pipes of the first and second pure water tanks. The three-way regulating valve's second outlet is connected to the inlet of the outlet discharge pipe, and the discharge valve is installed on the outlet discharge pipe.

[0014] Using the above technical solution, by setting up a condensate recovery pretreatment unit, the condensate generated by the cathode of the external electrolytic cell first enters the condensate collection tank through the inlet end for temporary storage. An automatic condensate pump connected to the outlet end of the condensate collection tank extracts the condensate from the tank and first sends it to a precision filter for impurity filtration. The filtered water then flows to an ion exchange column to remove ionic impurities, and then enters an ultraviolet sterilizer for sterilization. After the above three-stage treatment, the water flows through the pipeline between the outlet end of the ultraviolet sterilizer and the inlet end of the three-way regulating valve. The conductivity sensor, hardness sensor, dissolved oxygen sensor, and pH sensor, which are located on the side wall of this section of the pipe and whose sensing ends extend into the pipe, directly contact the water flow to complete water quality testing. The tested water flow enters the three-way regulating valve. The first outlet of the three-way regulating valve is connected to the top inlet pipes of the first and second pure water tanks through the pure water return pipe, which can deliver the treated water to the pure water tanks. The second outlet of the three-way regulating valve is connected to the outlet discharge pipe, which can discharge the treated water outward. The discharge valve installed on the outlet discharge pipe is used to control the opening and closing of the pipeline.

[0015] The present invention is further configured such that: the emergency water supply unit includes an emergency pure water tank, an emergency water supply pump, and an emergency water outlet valve; the inlet of the emergency pure water tank is used to connect with an external pure water source; the inlet of the emergency water supply pump is connected with the outlet of the emergency pure water tank; the outlet of the emergency water supply pump is connected with the inlet of the emergency water outlet valve; the outlet of the emergency water outlet valve is connected with the inlet of the dual-tank switching water supply unit; and the control terminal of the emergency water outlet valve is electrically connected to the output terminal of the main controller.

[0016] By adopting the above technical solution, an emergency water supply unit is set up. The emergency pure water tank of the emergency water supply unit is pre-filled with water from an external pure water source. During normal operation, the main controller controls the emergency outlet valve to be closed, cutting off the connection between the emergency water supply path and the dual-tank switching water supply unit. This prevents the pressure of the regular water supply from flowing back into the emergency tank and does not affect the pressure and flow of the regular water supply. When the variable frequency water supply unit malfunctions and cannot supply water normally, or when the amount of recycled water from the condensate recovery cannot meet the water demand of the electrolyzer, the main controller first controls the emergency outlet valve to open, and then controls the emergency water supply pump to start, delivering the pure water pre-stored in the emergency pure water tank to the inlet of the dual-tank switching water supply unit, maintaining the normal water output of the two tanks, ensuring that the pure water supply to the electrolyzer is uninterrupted, and preventing the electrolyzer from stopping operation due to insufficient water supply.

[0017] The present invention is further configured such that: the main controller is configured to adjust the operating parameters and number of operating units of the variable frequency pump group according to the feedback signals of the pressure sensor and the flow sensor, and to control the opening and closing actions of the independent control valves at the inlet and outlet of each variable frequency pump group.

[0018] By adopting the above technical solution and configuring the main controller as described above, the main controller receives signals transmitted from the pressure sensor and flow sensor downstream of the main outlet valve, adjusts the operating parameters and number of variable frequency pump sets according to the signals, and simultaneously controls the opening and closing of the independent control valves at the inlet and outlet of each variable frequency pump set to adjust the water supply status.

[0019] The present invention is further configured such that: the main controller is configured to control the opening and closing actions of the first outlet valve and the second outlet valve according to the detection signal of the multi-parameter online water quality monitoring component, and to control the opening and closing actions of the first inlet valve and the second inlet valve according to the detection signal of the liquid level sensor.

[0020] By adopting the above technical solution and configuring the main controller as described above, the main controller receives the water quality signal of the electrolytic cell inlet water transmitted by the multi-parameter online water quality monitoring component, and controls the opening and closing of the first outlet valve and the second outlet valve accordingly. At the same time, it receives the liquid level signal transmitted by the liquid level sensor at the top of the first pure water tank and the second pure water tank, and controls the opening and closing of the first inlet valve and the second inlet valve accordingly, thereby realizing the automatic switching operation and water replenishment of the two tanks.

[0021] The present invention is further configured such that: the main controller is configured to control the opening of the three-way regulating valve according to the water quality detection signal at the outlet of the condensate recovery pretreatment unit, so that the treated water flows to the pure water return pipe or the outlet discharge pipe.

[0022] Using the above technical solution, by setting the configuration of the main controller, the main controller receives the water quality detection signal from the outlet of the condensate recovery pretreatment unit, and adjusts the opening of the three-way regulating valve according to the signal, so that the treated water with qualified water quality flows to the pure water return pipe and enters the dual tank storage, and the treated water with unqualified water quality flows to the outlet discharge pipe and is discharged outward.

[0023] The present invention is further configured such that: the main controller is equipped with a remote communication module, which is used to upload system operating parameters, water quality data and alarm information.

[0024] By adopting the above technical solution and setting up a remote communication module, the main controller can upload the operating parameters of the entire system, water quality detection data at various locations, and alarm information generated by the system to a remote end, so that relevant personnel can check the system status.

[0025] (III) Beneficial Effects Compared with the prior art, the present invention provides a pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer, which has the following beneficial effects: This invention relates to a pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer. It includes a photovoltaic output prediction module, a variable frequency water supply unit, a dual-tank switching water supply unit, and a multi-parameter online water quality monitoring component. The photovoltaic output prediction module transmits the photovoltaic output prediction signal to the main controller, which adjusts the operation of the variable frequency water supply unit based on this signal to match the water supply flow rate with the load changes of the electrolyzer. The dual-tank switching water supply unit buffers and stores the water supply, further reducing fluctuations in water pressure and flow rate, and preventing problems such as decreased gas-liquid separation efficiency and dry burning of the electrodes caused by water supply fluctuations. The multi-parameter online water quality monitoring component monitors the water quality parameters of the supplied water and the recovered condensate in real time and transmits the detection signal to the main controller. The main controller controls the opening and closing of the outlet valve of the dual-tank switching water supply unit based on the water quality detection signal, preventing unqualified pure water from entering the electrolyzer and preventing electrolyte contamination and electrode passivation. This invention relates to a pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer. It comprises a condensate recovery and pretreatment unit, an emergency water supply unit, and a main controller. The condensate recovery and pretreatment unit collects and treats the condensate generated at the electrolyzer cathode. After treatment, the water is monitored by a multi-parameter online water quality monitoring component, and its flow is controlled by the main controller. The qualified condensate is then transported to a dual-tank switching water supply unit for reuse, reducing water consumption. The emergency water supply unit provides emergency pure water to the dual-tank switching water supply unit in case of a main water supply system failure, ensuring continuous operation of the electrolyzer. The main controller coordinates the operation of each unit, ensuring stable operation of the entire water supply system and extending the electrolyzer's service life. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the main controller in this invention; Figure 3 This is a schematic diagram of the variable frequency water supply unit in this invention; Figure 4 This is a schematic diagram of the dual-tank switching water supply unit in this invention; Figure 5 This is a schematic diagram of the structure of the multi-parameter online water quality monitoring component in this invention; Figure 6 This is a schematic diagram of the structure of the condensate recovery pretreatment unit in this invention; Figure 7 This is a schematic diagram of the emergency water supply unit in this invention; Figure 8 This is a schematic diagram of the electrical connections in this invention.

[0027] In the diagram: 1. Main controller; 2. Photovoltaic output prediction module; 3. Variable frequency water supply unit; 301. Variable frequency pump unit; 302. Main inlet valve; 303. Main outlet valve; 304. Pressure sensor; 305. Flow sensor; 4. Dual-tank switching water supply unit; 401. First pure water tank; 402. Second pure water tank; 403. First inlet valve; 404. Second inlet valve; 405. First outlet valve; 406. Second outlet valve; 407. Liquid level sensor; 408. Outlet water transfer pump; 5. Multi-parameter online water quality monitoring component; 01. Conductivity sensor; 502. Hardness sensor; 503. Dissolved oxygen sensor; 504. pH sensor; 6. Condensate recovery and pretreatment unit; 601. Condensate collection tank; 602. Automatic condensate pump; 603. Precision filter; 604. Ion exchange column; 605. Ultraviolet sterilizer; 606. Three-way regulating valve; 607. Pure water return pipe; 608. Outlet water discharge pipe; 609. Discharge valve; 7. Emergency water supply unit; 701. Emergency pure water tank; 702. Emergency water supply pump; 703. Emergency outlet valve. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1 Please see Figure 1-5A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer includes a main controller 1, a variable frequency water supply unit 3, and a dual-tank switching water supply unit 4. The main controller 1 integrates a photovoltaic output prediction module 2, which collects real-time output data from an external photovoltaic power station via a data interface and generates a prediction signal. The output of the main controller 1 is electrically connected to the control terminal of the variable frequency water supply unit 3. By configuring the main controller 1, the photovoltaic output prediction module 2, the variable frequency water supply unit 3, and the dual-tank switching water supply unit 4, the photovoltaic output prediction module 2 establishes a data connection with the external photovoltaic power station, collects real-time sunlight and output data from the photovoltaic power station, and generates a prediction signal for the changing trend of photovoltaic output. The signal is transmitted to the input of the main controller 1. The output of the main controller 1 is electrically connected to the control terminal of the variable frequency water supply unit 3. Based on the received photovoltaic output prediction signal, the main controller 1 adjusts the operating status of the variable frequency water supply unit 3 in advance so that the water supply flow is adapted to the load change of the electrolyzer under the photovoltaic output fluctuation, avoiding the mismatch between the water supply flow and the actual demand of the electrolyzer. The pure water output by the variable frequency water supply unit 3 is temporarily stored and buffered inside the dual-tank switching water supply unit 4. The dual-tank switching water supply unit 4 can realize alternating water storage and water supply operations, stably output pure water and deliver it to the external electrolyzer, alleviate the water supply pressure and flow fluctuation problems caused by photovoltaic output fluctuation, and ensure the continuity and stability of pure water supply to the electrolyzer.

[0030] The variable frequency water supply unit 3 includes at least two variable frequency pump sets 301 connected in parallel, a main inlet valve 302, a main outlet valve 303, a pressure sensor 304, and a flow sensor 305. The main inlet valve 302 is located on the main inlet pipe of the variable frequency water supply unit 3 and is used to control the total intake of external pure water. Each variable frequency pump set 301 has an independent control valve at its inlet and outlet to enable independent start-up, shutdown, and maintenance switching of a single variable frequency pump set 301. The main outlet valve 303 is located on the main outlet pipe of the variable frequency water supply unit 3 and is used to control the total output of the variable frequency water supply unit 3. The pressure sensor 304 and the flow sensor 305 are both located on the main outlet pipe downstream of the main outlet valve 303. The signal output terminals of force sensor 304 and flow sensor 305 are both electrically connected to the input terminal of main controller 1. By setting up variable frequency water supply unit 3, external pure water first enters the system through the inlet main valve 302 set on the inlet main pipe, and then is distributed to at least two variable frequency pump sets 301 set in parallel. The independent control valves at the inlet and outlet of each variable frequency pump set 301 can be opened and closed separately to realize the start-up, shutdown and maintenance switching of a single pump set. The pure water output by variable frequency pump set 301 passes through the outlet main valve 303 set on the outlet main pipe. The pressure sensor 304 and flow sensor 305 set on the outlet main pipe downstream of the outlet main valve 303 collect the pressure and flow data of the water supply in real time and transmit the signals to the main controller 1.

[0031] The dual-tank switching water supply unit 4 includes a first pure water tank 401, a second pure water tank 402, a first inlet valve 403, a second inlet valve 404, a first outlet valve 405, a second outlet valve 406, a level sensor 407, and an outlet water delivery pump 408. The level sensor 407 is respectively installed on the top of the first pure water tank 401 and the second pure water tank 402, and the sensing end of the level sensor 407 passes through the top of the first pure water tank 401 and the second pure water tank 402 and extends into the interior. The signal output terminal of the liquid level sensor 407 is electrically connected to the input terminal of the main controller 1. The first inlet valve 403 and the second inlet valve 404 are respectively installed on the top inlet pipes of the first pure water tank 401 and the second pure water tank 402, and both the first inlet valve 403 and the second inlet valve 404 are connected to the main outlet pipe of the variable frequency water supply unit 3. The first outlet valve 405 and the second outlet valve 406 are respectively installed on the bottom outlet pipes of the first pure water tank 401 and the second pure water tank 402. The outlet water pump 408 is installed on the main outlet pipe of the dual-tank switching water supply unit 4. The outlet end of the outlet water pump 408 is used to connect to the pure water inlet of the external electrolytic cell, and the control end of the outlet water pump 408 is electrically connected to the main controller 1. By setting up the dual-tank switching water supply unit 4, the pure water output by the variable frequency water supply unit 3 enters the corresponding tanks through the first inlet valve 403 and the second inlet valve 404 installed on the top inlet pipes of the first pure water tank 401 and the second pure water tank 402, respectively. The first pure water tank 401 or the second pure water tank 402 temporarily stores the water. A liquid level sensor 407, which is installed on the top of the two pure water tanks and whose sensing end extends into the tank, detects the liquid level in the tank in real time and transmits the signal to the main controller 1. Pure water flows out from the first outlet valve 405 and the second outlet valve 406 installed on the outlet pipes at the bottom of the two pure water tanks and flows into the main outlet pipe of the dual-tank switching water supply unit 4. The water is then transported to the pure water inlet of the external electrolytic cell by the outlet pump 408 installed on the main outlet pipe.

[0032] The working principle of this embodiment is as follows: First, the photovoltaic output prediction module 2 establishes a data interface with the external photovoltaic power station, collects real-time sunlight conditions and output-related data of the photovoltaic power station, and generates a prediction signal of the photovoltaic output change trend. The photovoltaic output prediction module 2 sends the generated prediction signal to the input terminal of the main controller 1. During the use of the entire structure, after receiving the signal transmitted by the photovoltaic output prediction module 2, the main controller 1 sends control commands to the variable frequency water supply unit 3 through its own output terminal. Based on the change trend of photovoltaic output, it matches the water demand of the electrolyzer load and manages the overall working status of the variable frequency water supply unit 3. External pure water is supplied through the main inlet pipe of the variable frequency water supply unit 3. The water enters the pipeline through the main inlet valve 302 and is then diverted to at least two parallel variable frequency pump sets 301. Each variable frequency pump set 301 is equipped with an independent control valve at both its inlet and outlet, allowing for on / off control of a single pump set 301. This facilitates start-up, shutdown, and maintenance switching of individual units. The purified water delivered by the variable frequency pump sets 301 flows through the main outlet valve 303 on the main outlet pipe, completing the overall pipeline on / off control. The water then flows to the main outlet pipe downstream of the main outlet valve 303. Pressure sensors 304 and flow sensors 305, installed on this pipeline, collect real-time data on the water supply pressure and flow rate within the pipeline and transmit the collected signals to the main controller 1. The input terminal provides data for subsequent control by the main controller 1. The pure water supplied by the variable frequency water supply unit 3 is diverted into the first pure water tank 401 and the second pure water tank 402 for storage via the first inlet valve 403 and the second inlet valve 404 respectively installed on the top inlet pipes of the first pure water tank 401 and the second pure water tank 402. Liquid level sensors 407, installed on the top of the first pure water tank 401 and the second pure water tank 402, extend through the top of the tank and into the tank body, respectively, to detect the pure water storage level in real time and transmit the liquid level detection signal to the input terminal of the main controller 1. Based on the received liquid level signal, the main controller 1 controls the first inlet valve accordingly. 403. The opening and closing of the second inlet valve 404 enables the alternating water intake and storage operation between the first pure water tank 401 and the second pure water tank 402. The pure water in the tanks flows out from the first outlet valve 405 and the second outlet valve 406 installed on the bottom outlet pipes of the first pure water tank 401 and the second pure water tank 402, respectively, and is collected and merged into the outlet main pipe of the dual-tank switching water supply unit 4. Then, the water is transported outward by the outlet pump 408 installed on the outlet main pipe. The outlet end of the outlet pump 408 is connected to the pure water inlet of the external electrolytic cell, so as to continuously transport the pressure-stabilized and buffered pure water to the inside of the electrolytic cell, adapt to the normal water supply of the electrolytic cell under the power output fluctuation of the photovoltaic power station, and maintain the stable operating conditions of the equipment.

[0033] Example 2 refer to Figure 6-7A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer also includes a multi-parameter online water quality monitoring component 5, a condensate recovery and pretreatment unit 6, and an emergency water supply unit 7. The inlet of the dual-tank switching water supply unit 4 is connected to the outlet of the variable frequency water supply unit 3, the outlet of the condensate recovery and pretreatment unit 6, and the outlet of the emergency water supply unit 7, respectively. The outlet of the dual-tank switching water supply unit 4 is connected to the pure water inlet of an external electrolyzer. The multi-parameter online water quality monitoring component 5 is respectively installed at the outlet of the dual-tank switching water supply unit 4. The main pipe and the outlet of the condensate recovery and pretreatment unit 6 are connected, and the signal output terminal of the multi-parameter online water quality monitoring component 5 is electrically connected to the input terminal of the main controller 1. The output terminal of the main controller 1 is electrically connected to the control terminal of the dual-tank switching water supply unit 4, the control terminal of the main controller 1 is electrically connected to the control terminal of the condensate recovery and pretreatment unit 6, and the control terminal of the emergency water supply unit 7 is electrically connected to the output terminal of the main controller 1. By setting up the multi-parameter online water quality monitoring component 5, the condensate recovery and pretreatment unit 6, and the emergency water supply unit 7, multi-parameter online water quality monitoring is achieved. Component 5 is positioned at two locations: the main outlet pipe of the dual-tank switching water supply unit 4 and the outlet of the condensate recovery pretreatment unit 6. It monitors the quality of the pure water output from the dual-tank switching water supply unit 4 and the quality of the condensate after treatment by the condensate recovery pretreatment unit 6 in real time, and feeds the water quality detection signals back to the input of the main controller 1. The main controller 1 controls the operation of the dual-tank switching water supply unit 4 and the condensate recovery pretreatment unit 6 based on the water quality signals, intercepting and disposing of substandard water, supplying only the qualified pure water to the electrolyzer, and controlling the condensate... The recycling pretreatment unit 6 collects and purifies the condensate generated at the cathode of the electrolytic cell. The main controller 1 controls the flow direction of the treated water based on the water quality detection signal at its outlet, realizing the recycling of qualified water and reducing water waste. The emergency water supply unit 7 stores pure water in advance. When the normal water supply path of the system is abnormal, the main controller 1 controls the emergency water supply unit 7 to work and replenish pure water to the dual-tank switching water supply unit 4. In coordination with the main controller 1, the overall control of all units ensures the continuous and stable operation of the entire pure water supply system.

[0034] The multi-parameter online water quality monitoring component 5 includes a conductivity sensor 501, a hardness sensor 502, a dissolved oxygen sensor 503, and a pH sensor 504. These sensors are respectively installed on the main outlet pipe of the dual-tank switching water supply unit 4 and the outlet of the condensate recovery pretreatment unit 6. The multi-parameter online water quality monitoring component 5 on the main outlet pipe of the dual-tank switching water supply unit 4 monitors the quality of the pure water entering the external electrolyzer. The multi-parameter online water quality monitoring component 5 at the outlet of the condensate recovery pretreatment unit 6 monitors the quality of the recovered condensate. By installing the multi-parameter online water quality monitoring component 5, which consists of the conductivity sensor 501, hardness sensor 502, and dissolved oxygen sensor 503... It consists of a conductivity sensor 501, a hardness sensor 502, a dissolved oxygen sensor 503, and a pH sensor 504. One set of conductivity sensors 501, hardness sensors 502, dissolved oxygen sensors 503, and pH sensors 504 is arranged on the outlet main pipe of the dual-tank switching water supply unit 4 to collect various water quality parameters of the pure water that is about to enter the external electrolyzer in real time. The other set of conductivity sensors 501, hardness sensors 502, dissolved oxygen sensors 503, and pH sensors 504 is arranged at the outlet of the condensate recovery pretreatment unit 6 to collect various water quality parameters of the treated condensate in real time. The water quality signals collected by both sets of sensors are transmitted to the main controller 1. The main controller 1 controls the operation status of the corresponding water supply unit and recovery unit according to the received water quality signals to ensure that the pure water entering the electrolyzer and the condensate recovered and reused meet the requirements.

[0035] The condensate recovery pretreatment unit 6 includes a condensate collection tank 601, an automatic condensate pump 602, a precision filter 603, an ion exchange column 604, an ultraviolet sterilizer 605, a three-way regulating valve 606, a pure water return pipe 607, an outlet pipe 608, and an outlet valve 609. The inlet of the condensate collection tank 601 is connected to the cathode condensate outlet of an external electrolytic cell. The inlet of the automatic condensate pump 602 is connected to the bottom outlet of the condensate collection tank 601. The outlet of the automatic condensate pump 602 is connected to the inlet of the precision filter 603. The outlet of the precision filter 603 is connected to the inlet of the ion exchange column 604. The ion exchange column 604... The outlet end is connected to the inlet end of the ultraviolet sterilizer 605, and the outlet end of the ultraviolet sterilizer 605 is connected to the inlet end of the three-way regulating valve 606. The conductivity sensor 501, hardness sensor 502, dissolved oxygen sensor 503, and pH sensor 504 are all installed on the side wall of the pipe between the outlet end of the ultraviolet sterilizer 605 and the inlet end of the three-way regulating valve 606, with the sensing ends of each sensor extending into the pipe and directly contacting the water flow. The first outlet end of the three-way regulating valve 606 is connected to the inlet end of the pure water return pipe 607, and the outlet end of the pure water return pipe 607 is connected to the top inlet pipe of the first pure water tank 401 and the second pure water tank 402. The second outlet end of the three-way regulating valve 606... The outlet end is connected to the inlet end of the outlet discharge pipe 608. The discharge valve 609 is installed on the outlet discharge pipe 608. Through the condensate recovery pretreatment unit 6, the condensate generated by the cathode of the external electrolytic cell first enters the tank through the inlet end of the condensate collection tank 601 for temporary storage. The condensate automatic pump 602, which is connected to the outlet end of the bottom of the condensate collection tank 601, draws out the condensate from the tank and first sends it to the precision filter 603 for impurity filtration. The filtered water flows to the ion exchange column 604 to remove ionic impurities in the water, and then enters the ultraviolet sterilizer 605 for sterilization. After the above three-stage treatment, the water flows through the outlet end of the ultraviolet sterilizer 605 and the inlet end of the three-way regulating valve 606. The pipeline between these sections contains conductivity sensors 501, hardness sensors 502, dissolved oxygen sensors 503, and pH sensors 504, all installed on the side wall of the pipeline with their sensing ends extending into the pipeline. These sensors directly contact the water flow to perform water quality testing. The tested water flows into a three-way regulating valve 606. The first outlet of the three-way regulating valve 606 is connected to the top inlet pipes of the first pure water tank 401 and the second pure water tank 402 via a pure water return pipe 607, allowing the treated water to be transported to the pure water tanks. The second outlet of the three-way regulating valve 606 is connected to a water discharge pipe 608, allowing the treated water to be discharged. A discharge valve 609 installed on the water discharge pipe 608 is used to control the opening and closing of this pipeline.

[0036] The emergency water supply unit 7 includes an emergency pure water tank 701, an emergency water supply pump 702, and an emergency outlet valve 703. The inlet of the emergency pure water tank 701 is connected to an external pure water source. The inlet of the emergency water supply pump 702 is connected to the outlet of the emergency pure water tank 701, and the outlet of the emergency water supply pump 702 is connected to the inlet of the emergency outlet valve 703. The outlet of the emergency outlet valve 703 is connected to the inlet of the dual-tank switching water supply unit 4. The control terminal of the emergency outlet valve 703 is electrically connected to the output terminal of the main controller 1. By setting up the emergency water supply unit 7, the emergency pure water tank 701 of the emergency water supply unit 7 is pre-filled with water from an external pure water source. During normal operation, the main controller... The controller 1 controls the emergency water outlet valve 703 to be closed, cutting off the connection between the emergency water supply path and the dual-tank switching water supply unit 4, preventing the pressure of the regular water supply from flowing back into the emergency tank, and also not affecting the pressure and flow of the regular water supply. When the variable frequency water supply unit 3 malfunctions and cannot supply water normally, or when the amount of recycled water from the condensate recovery cannot meet the water demand of the electrolyzer, the main controller 1 first controls the emergency water outlet valve 703 to open, and then controls the emergency water supply pump 702 to start, delivering the pre-stored pure water in the emergency pure water tank 701 to the inlet of the dual-tank switching water supply unit 4, maintaining the normal water output of the two tanks, ensuring that the pure water supply to the electrolyzer is uninterrupted, and preventing the electrolyzer from stopping operation due to insufficient water supply.

[0037] The main controller 1 is configured to adjust the operating parameters and number of variable frequency pump sets 301 based on the feedback signals from the pressure sensor 304 and the flow sensor 305, and to control the opening and closing of the independent control valves at the inlet and outlet of each variable frequency pump set 301. By setting the configuration of the main controller 1 as described above, the main controller 1 receives the signals transmitted by the pressure sensor 304 and the flow sensor 305 downstream of the main outlet valve 303, adjusts the operating parameters and number of variable frequency pump sets 301 based on the signals, and simultaneously controls the opening and closing of the independent control valves at the inlet and outlet of each variable frequency pump set 301 to adjust the water supply status.

[0038] The main controller 1 is configured to control the opening and closing of the first outlet valve 405 and the second outlet valve 406 based on the detection signal from the multi-parameter online water quality monitoring component 5, and to control the opening and closing of the first inlet valve 403 and the second inlet valve 404 based on the detection signal from the level sensor 407. By setting the configuration of the main controller 1 as described above, the main controller 1 receives the electrolytic cell inlet water quality signal transmitted by the multi-parameter online water quality monitoring component 5 and controls the opening and closing of the first outlet valve 405 and the second outlet valve 406 accordingly. At the same time, it receives the level signal transmitted by the level sensor 407 at the top of the first pure water tank 401 and the second pure water tank 402 and controls the opening and closing of the first inlet valve 403 and the second inlet valve 404 accordingly, thereby realizing the automatic switching operation and water replenishment of the two tanks.

[0039] The main controller 1 is configured to control the opening of the three-way regulating valve 606 according to the water quality detection signal at the outlet of the condensate recovery pretreatment unit 6, so that the treated water flows to the pure water return pipe 607 or the outlet pipe 608. By setting the above configuration of the main controller 1, the main controller 1 receives the water quality detection signal at the outlet of the condensate recovery pretreatment unit 6, and adjusts the opening of the three-way regulating valve 606 according to the signal, so that the treated water with qualified water quality flows to the pure water return pipe 607 and enters the dual tank storage, and the treated water with unqualified water quality flows to the outlet pipe 608 and is discharged.

[0040] The main controller 1 is equipped with a remote communication module, which is used to upload system operating parameters, water quality data and alarm information. By setting up the remote communication module, the main controller 1 can upload the operating parameters of the entire system, water quality detection data at each location and alarm information generated by the system to the remote end, so that relevant personnel can check the system status.

[0041] The working principle of this embodiment is as follows: First, the basic operation process of photovoltaic output prediction, frequency conversion water supply, and dual-tank switching water storage and supply is the same as in Embodiment 1. On this basis, the newly added multi-parameter online water quality monitoring component 5, condensate recovery pretreatment unit 6, and emergency water supply unit 7 work together to further improve the water supply guarantee of the entire system. The system is equipped with two sets of multi-parameter online water quality monitoring components 5. One set is installed on the outlet main pipe of the dual-tank switching water supply unit 4 and consists of conductivity sensor 501, hardness sensor 502, dissolved oxygen sensor 503, and pH sensor 504, which collect various water quality parameters of the pure water about to enter the electrolyzer in real time. The other set is installed at the outlet of the condensate recovery pretreatment unit 6 and also consists of the above four types of sensors. The system collects water quality parameters of the processed recycled condensate in real time. Signals from both sets of sensors are transmitted to the input of the main controller 1. Upon receiving the water quality signal, the main controller 1 controls the opening and closing of the first outlet valve 405 and the second outlet valve 406 to intercept substandard water, supplying only compliant pure water to the electrolyzer. Simultaneously, based on the signals from the liquid level sensors 407 at the top of the two pure water tanks, it controls the opening and closing of the first inlet valve 403 and the second inlet valve 404, enabling automatic switching and water replenishment between the two tanks. The condensate generated at the cathode of the external electrolyzer first enters the condensate collection tank 601 for temporary storage. An automatic condensate pump 602, connected to the bottom outlet of the condensate collection tank 601, extracts the condensate from the tank, which then passes through a precision filter 603 and an ion exchanger. The column replacement 604 and ultraviolet sterilizer 605 complete the three-stage purification process. The treated water flows through the pipeline between the ultraviolet sterilizer 605 and the three-way regulating valve 606. The sensor at this location performs water quality detection. The main controller 1 adjusts the opening of the three-way regulating valve 606 according to the detection signal. Water with qualified water quality is transported to the top inlet pipeline of the two pure water tanks through the pure water return pipeline 607 and enters the pure water tank for storage and reuse. Water with unqualified water quality is discharged through the outlet discharge pipe 608. The discharge valve 609 set on the outlet discharge pipe 608 cooperates to open and close the pipeline, thereby realizing the recycling of qualified water and reducing water waste. The emergency pure water tank 701 of the emergency water supply unit 7 is pre-filled with water from an external pure water source. When the frequency converter... When the water supply unit 3 malfunctions and cannot supply water normally, or when the amount of recycled water from the condensate recovery is insufficient to meet the water demand of the electrolyzer, the main controller 1 first controls the emergency outlet valve 703 to open, and then controls the emergency water supply pump 702 to start, delivering the pre-stored pure water in the emergency pure water tank 701 to the inlet of the dual-tank switching water supply unit 4, maintaining the normal water output of the dual tanks, ensuring uninterrupted pure water supply to the electrolyzer, and preventing the electrolyzer from stopping operation due to insufficient water supply. The remote communication module configured in the main controller 1 can upload the operating parameters of the entire system, water quality detection data at each location, and alarm information generated by the system to the remote end, so that relevant personnel can check the system status. The main controller 1 coordinates the operation of all units to ensure the continuous and stable operation of the entire pure water supply system.

[0042] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. Those skilled in the art can make modifications to this embodiment without contributing any inventive step after reading this specification. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer, comprising a main controller (1), a variable frequency water supply unit (3), a double-tank switching water supply unit (4), a multi-parameter water quality online monitoring assembly (5), a condensate water recovery pretreatment unit (6), and an emergency water supply unit (7), characterized in that: The main controller (1) integrates a photovoltaic power output prediction module (2). The photovoltaic power output prediction module (2) is used to collect real-time power output data of the external photovoltaic power station through the data interface and generate prediction signals. The output terminal of the main controller (1) is electrically connected to the control terminal of the variable frequency water supply unit (3). The inlet of the dual-tank switching water supply unit (4) is connected to the outlet of the variable frequency water supply unit (3), the outlet of the condensate recovery pretreatment unit (6), and the outlet of the emergency water supply unit (7), respectively. The outlet of the dual-tank switching water supply unit (4) is used to connect with the pure water inlet of the external electrolytic cell. The water inlets are connected, and the multi-parameter online water quality monitoring component (5) is respectively installed at the outlet of the main water supply unit (4) and the outlet of the condensate recovery pretreatment unit (6). The signal output terminal of the multi-parameter online water quality monitoring component (5) is electrically connected to the input terminal of the main controller (1). The output terminal of the main controller (1) is electrically connected to the control terminal of the dual-tank switching water supply unit (4). The output terminal of the main controller (1) is electrically connected to the control terminal of the condensate recovery pretreatment unit (6). The control terminal of the emergency water supply unit (7) is electrically connected to the output terminal of the main controller (1).

2. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer according to claim 1, characterized in that: The variable frequency water supply unit (3) includes at least two variable frequency pump sets (301) connected in parallel, a main inlet valve (302), a main outlet valve (303), a pressure sensor (304), and a flow sensor (305). The main inlet valve (302) is installed on the main inlet pipe of the variable frequency water supply unit (3) and is used to control the total intake of external pure water. Each variable frequency pump set (301) has an independent control valve at its inlet and outlet to realize the control of the flow of water from a single pump set. The independent start-up, shutdown, and maintenance switching of the frequency pump unit (301) are achieved. The main outlet valve (303) is installed on the main outlet pipe of the frequency converter water supply unit (3) to control the total water output of the frequency converter water supply unit (3). The pressure sensor (304) and the flow sensor (305) are both installed on the main outlet pipe downstream of the main outlet valve (303), and the signal output terminals of the pressure sensor (304) and the flow sensor (305) are electrically connected to the input terminal of the main controller (1).

3. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer according to claim 1, characterized in that: The dual-tank switching water supply unit (4) includes a first pure water tank (401), a second pure water tank (402), a first inlet valve (403), a second inlet valve (404), a first outlet valve (405), a second outlet valve (406), a level sensor (407), and an outlet pump (408). The level sensor (407) is respectively installed on the top of the first pure water tank (401) and the second pure water tank (402). The sensing end of the level sensor (407) passes through the top of the first pure water tank (401) and the second pure water tank (402) and extends into them. The signal output end of the level sensor (407) is electrically connected to the input end of the main controller (1). The first inlet valve (403) The first and second inlet valves (403 and 404) are respectively installed on the top inlet pipes of the first pure water tank (401) and the second pure water tank (402), and the first inlet valve (403) and the second inlet valve (404) are connected to the main outlet pipe of the variable frequency water supply unit (3). The first outlet valve (405) and the second outlet valve (406) are respectively installed on the bottom outlet pipes of the first pure water tank (401) and the second pure water tank (402). The outlet pump (408) is installed on the main outlet pipe of the dual tank switching water supply unit (4). The outlet end of the outlet pump (408) is used to connect to the pure water inlet of the external electrolytic cell, and the control end of the outlet pump (408) is electrically connected to the main controller (1).

4. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer according to claim 3, characterized in that: The multi-parameter online water quality monitoring component (5) includes a conductivity sensor (501), a hardness sensor (502), a dissolved oxygen sensor (503), and a pH sensor (504). The conductivity sensor (501), hardness sensor (502), dissolved oxygen sensor (503), and pH sensor (504) are respectively installed on the main outlet pipe of the dual-tank switching water supply unit (4) and the outlet end of the condensate recovery pretreatment unit (6). The multi-parameter online water quality monitoring component (5) on the main outlet pipe of the dual-tank switching water supply unit (4) is used to monitor the pure water quality entering the external electrolysis cell. The multi-parameter online water quality monitoring component (5) at the outlet end of the condensate recovery pretreatment unit (6) is used to monitor the water quality of the recovered condensate.

5. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer according to claim 4, characterized in that: The condensate recovery pretreatment unit (6) includes a condensate collection tank (601), an automatic condensate pump (602), a precision filter (603), an ion exchange column (604), an ultraviolet sterilizer (605), a three-way regulating valve (606), a pure water return pipe (607), an outlet pipe (608), and an outlet valve (609). The inlet of the condensate collection tank (601) is connected to the cathode condensate outlet of the external electrolytic cell. The inlet of the automatic condensate pump (602) is connected to the bottom outlet of the condensate collection tank (601). The outlet of the automatic condensate pump (602) is connected to the inlet of the precision filter (603). The outlet of the precision filter (603) is connected to the inlet of the ion exchange column (604). The outlet of the ion exchange column (604) is connected to the inlet of the ultraviolet sterilizer (605). The outlet of the ultraviolet sterilizer (605) is connected to the inlet of the three-way regulating valve (606). The conductivity sensor (501), hardness sensor (502), dissolved oxygen sensor (503), and pH sensor (504) are all installed on the side wall of the pipe between the outlet of the ultraviolet sterilizer (605) and the inlet of the three-way regulating valve (606), and the sensing ends of each sensor extend into the pipe and are in direct contact with the water flow. The first outlet of the three-way regulating valve (606) is connected to the inlet of the pure water return pipe (607). The outlet of the pure water return pipe (607) is connected to the top inlet pipe of the first pure water tank (401) and the second pure water tank (402). The second outlet of the three-way regulating valve (606) is connected to the inlet of the outlet drain pipe (608). The drain valve (609) is installed on the outlet drain pipe (608).

6. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer according to claim 1, characterized in that: The emergency water supply unit (7) includes an emergency pure water tank (701), an emergency water supply pump (702), and an emergency outlet valve (703). The inlet of the emergency pure water tank (701) is used to connect with an external pure water source. The inlet of the emergency water supply pump (702) is connected to the outlet of the emergency pure water tank (701). The outlet of the emergency water supply pump (702) is connected to the inlet of the emergency outlet valve (703). The outlet of the emergency outlet valve (703) is connected to the inlet of the dual-tank switching water supply unit (4). The control terminal of the emergency outlet valve (703) is electrically connected to the output terminal of the main controller (1).

7. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer according to claim 2, characterized in that: The main controller (1) is configured to adjust the operating parameters and number of operating units of the variable frequency pump group (301) according to the feedback signals of the pressure sensor (304) and the flow sensor (305), and to control the opening and closing actions of the independent control valves at the inlet and outlet of each variable frequency pump group (301).

8. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer according to claim 3, characterized in that: The main controller (1) is configured to control the opening and closing of the first outlet valve (405) and the second outlet valve (406) according to the detection signal of the multi-parameter online water quality monitoring component (5), and to control the opening and closing of the first inlet valve (403) and the second inlet valve (404) according to the detection signal of the liquid level sensor (407).

9. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer according to claim 5, characterized in that: The main controller (1) is configured to control the opening of the three-way regulating valve (606) according to the water quality detection signal at the outlet of the condensate recovery pretreatment unit (6), so that the treated water flows to the pure water return pipe (607) or the outlet discharge pipe (608).

10. A pure water supply structure for a photovoltaic renewable energy hydrogen production electrolyzer according to claim 1, characterized in that: The main controller (1) is equipped with a remote communication module, which is used to upload system operating parameters, water quality data and alarm information.

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