Full-digital hydrogen production rectification power supply with high energy density and hydrogen production system

Abstract

The invention discloses a high-energy-density full-digital hydrogen production rectification power supply and a hydrogen production system, and belongs to the technical field of power electronics and electrical engineering. The power supply comprises an electric energy conversion unit and a measurement and control unit. The electric energy conversion unit is vertically arranged in the first cavity, the measurement and control unit is vertically arranged in the second cavity, the first cavity and the second cavity are horizontally arranged, and a metal isolation plate is arranged between the first cavity and the second cavity. The electric energy conversion unit comprises an upper bridge, a waterway system and a lower bridge which are vertically arranged from top to bottom, and the upper bridge and the lower bridge are vertically symmetrical. The measurement and control unit comprises a coordination controller, a pulse controller, a pulse trigger plate and a temperature transmitter which are located between the upper bridge and the lower bridge. The power supply can solve the problem that the power supply cannot be installed in the prefabricated cabin with limited volume due to large volume in the prior art, and has the advantages of reducing the cost, simplifying the software algorithm and improving the system reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics and electrical engineering, and in particular relates to a high-energy-density fully digital hydrogen-producing rectifier power supply and a hydrogen-producing system. Background Art

[0002] The hydrogen energy industry and new energy industry continue to develop, and a large number of new energy power generation are connected to the power grid. However, the notable feature of power production is that electricity cannot be stored in large quantities, and active power and reactive power must be balanced in real time, otherwise it will affect the voltage or frequency quality and even the stability of the power system. New energy power generation is characterized by randomness and volatility, and it is difficult to ensure the supply and demand matching of the power grid, which has caused a large number of wind and power abandonment phenomena. Using green electricity from new energy such as wind power and photovoltaics to produce green hydrogen, forming a wind, solar, hydrogen and storage integration, can well solve the problem of new energy power consumption and play a supporting role in the green transformation of energy.

[0003] At present, the traditional hydrogen production rectifier power supply mainly has small power requirements and low energy density per unit area, and is mainly used in the fields of petrochemical industry, industrial smelting, etc. The control unit and power unit in the electric control cabinet are arranged horizontally, and the power unit adopts multi-bridge parallel horizontal arrangement. 3 / h or above, the required rectifier power supply is mainly high-power. According to the design method of traditional rectifier power supply, the rectifier power supply is large in size and cannot be installed in a prefabricated cabin with limited volume. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-energy-density fully digital hydrogen production rectifier power supply and hydrogen production system in view of the above-mentioned deficiencies in the prior art, which has the characteristics of small size and high energy density per unit area and is easy to install in a prefabricated cabin.

[0005] In a first aspect, the present invention provides a high energy density fully digital hydrogen production rectifier power supply, comprising an electric energy conversion unit and a measurement and control unit.

[0006] The power conversion unit is arranged vertically in the first cavity, and the measurement and control unit is arranged vertically in the second cavity. The first cavity and the second cavity are arranged horizontally, and a metal isolation plate is provided between the two cavities. The power conversion unit includes an upper bridge, a water system, and a lower bridge, which are arranged vertically from top to bottom, and the upper bridge and the lower bridge are symmetrical from top to bottom. The measurement and control unit includes a coordination controller, a pulse controller, a pulse trigger board, and a temperature transmitter, which are located between the upper bridge and the lower bridge.

[0007] Preferably, the measurement and control unit further includes a measurement acquisition circuit. The measurement acquisition circuit includes a first cable, a second cable, a third cable, and a fourth cable. Among them, the number of the first cable, the second cable, the third cable, and the fourth cable is a plurality of cables, the cable lengths of the plurality of first cables are equal, the cable lengths of the plurality of second cables are equal, the cable lengths of the plurality of third cables are equal, and the cable lengths of the plurality of fourth cables are equal.

[0008] Preferably, the first cable has one end connected to the input of the fast fuse and the other end connected to the coordination controller and the pulse controller. The second cable connects the temperature measuring element and the temperature transmitter. The third cable connects the auxiliary contact of the fast fuse and the coordination controller. The fourth cable has one end connected to the control end of the power device and the other end connected to the pulse trigger board.

[0009] Preferably, the measurement and acquisition loop includes a high-voltage analog quantity acquisition circuit.

[0010] The high voltage analog quantity acquisition circuit includes an electromagnetic compatibility EMC anti-interference circuit, a series voltage divider circuit, a high-frequency filter circuit, a follower circuit, a differential circuit, and an inverting circuit. The EMC anti-interference circuit includes a first capacitor, a second capacitor, a third capacitor, and a first inductor. The second capacitor and the third capacitor are connected in series to form a series branch. The series branch is connected in parallel with the first capacitor to form a parallel branch. One end of the parallel branch is connected to one end of the first inductor. The series voltage divider circuit includes a first resistor and a second resistor. The first resistor is connected in series with the second resistor. The other end of the first resistor is connected to the other end of the first inductor. The second resistor is connected in parallel with the high-frequency filter circuit. The high-frequency filter circuit includes a fourth capacitor and a fifth capacitor connected in parallel. The EMC anti-interference circuit, the series voltage divider circuit, and the high-frequency filter circuit are used to convert a high voltage signal into a low voltage signal. The follower circuit includes two operational amplifiers, the differential circuit includes several resistors and two operational amplifiers, and the follower circuit and the differential circuit are used to convert the low voltage signal into an inverted unipolar signal with a voltage rise preset threshold. The inverting circuit includes a plurality of resistors and an operational amplifier, and is used for converting the inverted unipolar signal into a unipolar signal which is in phase with the AC input signal and whose voltage is raised by a preset threshold.

[0011] Preferably, the preset threshold is 1.25V.

[0012] Preferably, the measurement and control unit also includes a human-machine interface and several sensors.

[0013] The human-machine interface is used for human-machine interaction. The network topology of the hydrogen production rectifier power supply adopts a three-layer two-network architecture. The lower layer includes a temperature transmitter and several sensors, the middle layer includes a coordination controller and a pulse controller, and the upper layer includes a human-machine interface and an external process host. The coordination controller is used to communicate with the human-machine interface, the pulse controller, and the external process host through the Ethernet port, and is also used to communicate with the temperature transmitter and several sensors through the bus.

[0014] Preferably, the fast fuse of the electric energy conversion unit has one end connected in series with the RC absorption module, and the other end connected in series with the half-bridge circuit.

[0015] Preferably, the water system includes a water inlet pipe, a water outlet pipe, a water inlet manifold, and a water outlet manifold, and the number of the water inlet pipe, the water outlet pipe, the water inlet manifold, and the water outlet manifold is 1.

[0016] Preferably, both the upper bridge and the lower bridge are fully controlled bridges.

[0017] In a second aspect, the present invention further provides a hydrogen production system, comprising an electrolyzer and the high energy density all-digital hydrogen production rectifier power supply described in the first aspect.

[0018] The high-energy-density all-digital hydrogen-producing rectifier power supply and hydrogen-producing system provided by the present invention vertically arrange the components in the power conversion unit and the measurement and control unit respectively to reduce the cabinet volume and the floor space. In addition, the upper bridge and the lower bridge of the power conversion unit are symmetrically arranged, and a water system is arranged in the middle position between the upper bridge and the lower bridge, and the measurement and control unit components are arranged between the upper bridge and the lower bridge, so that the distance between the relevant measurement points of the upper bridge and the lower bridge and the measurement and control unit is compact, thereby realizing a compact structure layout in the cabinet, further reducing the cabinet volume, and thus making the energy density per unit area high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a left view of a cross-sectional view of a high energy density all-digital hydrogen production rectifier power cabinet according to embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure layout of a high energy density all-digital hydrogen production rectifier power supply according to Example 1 of the present invention;

[0021] Figure 3 This is a front view of a high energy density all-digital hydrogen production rectifier power cabinet according to Example 1 of the present invention;

[0022] Figure 4 A top view of a cross-sectional view of a high energy density all-digital hydrogen production rectifier power cabinet according to embodiment 1 of the present invention;

[0023] Figure 5This is a schematic diagram of a portion of a high voltage analog quantity acquisition circuit according to Embodiment 1 of the present invention;

[0024] Figure 6 It is another partial schematic diagram of the high voltage analog quantity acquisition circuit of Embodiment 1 of the present invention;

[0025] Figure 7 A communication topology diagram of a high energy density all-digital hydrogen production rectifier power supply according to embodiment 1 of the present invention;

[0026] Figure 8 for Figure 4 The middle section of .

[0027] In the figure, 1. fast fuse, 2. upper bridge AC busbar, 3. water-cooled power component, 4. DC busbar, 5. water jacket inlet, 6. water jacket outlet, 7. water distributor outlet pipe, 8. water distributor inlet pipe, 9. water inlet flange, 10. water outlet flange, 11. upper bridge AC sampling point, 12. SCR resistor and capacitor, 13. upper bridge temperature measurement point, 14. DC voltage sampling point, 15. lower bridge AC sampling point, 16. lower bridge temperature measurement point, 17. control main board layer, 18. transmitter layer, 19. water inlet manifold, 20. water outlet manifold, 21. power device water inlet point, 22. power device water outlet point, 23. flow meter, 24. DC voltmeter, 25. DC ammeter, 26. touch screen, 27. operation button, 28 emergency stop knob. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] It should be understood that the specific embodiments and drawings described herein are only used to explain the present invention rather than to limit the present invention.

[0030] It can be understood that, in the absence of conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other.

[0031] It can be understood that, for the convenience of description, the drawings of the present invention only show the parts related to the present invention, while the parts irrelevant to the present invention are not shown in the drawings.

[0032] It can be understood that each unit and module involved in the embodiments of the present invention may correspond to only one physical structure, or may be composed of multiple physical structures, or multiple units and modules may be integrated into one physical structure.

[0033] It can be understood that, without conflict, the functions and steps marked in the flowcharts and block diagrams of the present invention may occur in an order different from that marked in the drawings.

[0034] It is understood that the flowcharts and block diagrams of the present invention illustrate the possible architectures, functions, and operations of the systems, devices, equipment, and methods according to the various embodiments of the present invention. Each box in the flowchart or block diagram may represent a unit, module, program segment, or code, which contains executable instructions for implementing the specified functions. Moreover, each box or combination of boxes in the block diagram and flowchart may be implemented by a hardware-based system that implements the specified functions, or may be implemented by a combination of hardware and computer instructions.

[0035] It can be understood that the units and modules involved in the embodiments of the present invention can be implemented by software or hardware. For example, the units and modules can be located in a processor.

[0036] Embodiment 1:

[0037] like Figure 1 As shown, this embodiment provides a high-energy-density fully digital hydrogen-producing rectifier power supply, which realizes AC-to-DC conversion of electric energy and controls the magnitude of DC voltage and current by controlling the on and off of power electronic semiconductor devices. It is applied to the electrolysis of water to produce hydrogen industry powered by conventional power grids and new energy power (photovoltaic, wind power), or petrochemical, electronics, metallurgical, power plants and other production processes that require hydrogen participation and have a demand for self-made hydrogen.

[0038] The high energy density fully digital hydrogen production rectifier power supply includes an electric energy conversion unit and a measurement and control unit.

[0039] The power conversion unit is arranged vertically in the first cavity, and the measurement and control unit is arranged vertically in the second cavity. The first cavity and the second cavity are arranged horizontally, and a metal isolation plate is provided between the two cavities. The power conversion unit includes an upper bridge, a water system, and a lower bridge, which are arranged vertically from top to bottom, and the upper bridge and the lower bridge are symmetrical from top to bottom. The measurement and control unit includes a coordination controller, a pulse controller, a pulse trigger board, and a temperature transmitter, which are located between the upper bridge and the lower bridge.

[0040] In this embodiment, the power conversion unit includes two upper and lower bridges composed of power devices and their RC absorption circuits, a fast fuse connected in series with the rectifier, a RC absorption circuit of the AC incoming line, a temperature measuring resistor fixed to the power device, a DC busbar, a DC Hall element, an AC incoming line busbar, a cooling water circuit, etc. Figure 2As shown, the power conversion unit is divided into three layers: upper, middle and lower. The upper layer is the upper bridge (UB bridge), and the lower layer is the lower bridge (DB bridge). The two power bridges are fully controlled bridges. The upper bridge and the lower bridge include power devices and RC absorption circuits connected in parallel with the positive and negative electrodes of the power devices, heat dissipation water bags, and water-cooled busbars. The middle layer is the water system, which is composed of water inlet flange 9, water outlet flange 10, water inlet pipe 8, water outlet pipe 7, water pressure gauge, and flow meter. The branch of the water inlet pipe is connected to the rubber hose through the water-cooled busbar or water bag and then connected to the water outlet pipe through the rubber hose. The DC outputs of the upper bridge and the lower bridge are connected in parallel (see DC busbar 4) and led downward to the external hydrogen electrolyzer. The positive output busbars of the two bridges are connected to the DC Hall sensor, which is used to measure the DC current. The measurement and control unit includes a coordination controller, a pulse controller, a pulse trigger board, a temperature transmitter, a DC voltmeter 24, a DC ammeter 25, a touch screen 26, an operation button 27, an emergency stop button 28, an external terminal block, etc. Among them, the components in the RC absorption circuit play a role in preventing the power unit from phase-changing overvoltage and operating overvoltage, and the output of the DC Hall element is connected to the coordination controller to detect the DC current of the system. The DC voltmeter and ammeter can display the DC voltage and current output by the hydrogen production rectifier power supply in real time; the touch screen is the main on-site human-computer interaction tool, and the system parameters and set values ​​can be input and viewed through it. The operating information and working status of the device can be viewed in real time through the touch screen. The traditional hydrogen production rectifier power supply cabinet is arranged horizontally. If the cabinet is directly changed from a horizontal layout to a vertical layout, the control unit is located at the upper or lower end of the power conversion unit, and the energy density per unit area will become higher, but the volume of the cabinet will not change. Figure 3 Shown and Figure 4 As shown, the measurement and control unit is located at the front of the cabinet, and the power conversion unit is located at the rear of the cabinet. In this embodiment, the measurement and control unit and the power conversion unit are arranged horizontally, and the internal components of the two are arranged vertically, which can improve the energy density per unit area and reduce the volume of the cabinet. In addition, the upper bridge and the lower bridge of the power conversion unit are arranged symmetrically up and down with the area where the water system is located as the axis, and the upper bridge and the lower bridge are connected by a set of water system, and the coordination controller, pulse controller, pulse trigger board, and temperature transmitter of the measurement and control unit are arranged between the upper bridge and the lower bridge (such as Figure 1 The middle control main board layer 17 and the transmitter layer 18 are arranged between the upper bridge and the lower bridge. The control main board layer 17 is provided with a coordination controller, a pulse controller, and a pulse trigger board, and the transmitter layer 18 is provided with a temperature transmitter), so that the structure inside the cabinet is more compact and the cabinet volume can be further reduced. A metal isolation plate with good shielding performance is used between the measurement and control unit and the power conversion unit for electromagnetic shielding and physical isolation, which can effectively block electromagnetic interference EMI and radio frequency interference RFI, and can also be used to physically isolate circuits of different voltage levels or different functions to prevent adverse interference and short circuit risks between the measurement and control unit and the power conversion unit.

[0041] Optionally, the measurement and control unit also includes a measurement acquisition circuit.

[0042] The measurement acquisition circuit includes a first cable, a second cable, a third cable, and a fourth cable. Among them, the number of the first cable, the second cable, the third cable, and the fourth cable is several, the cable lengths of the several first cables are equal, the cable lengths of the several second cables are equal, the cable lengths of the several third cables are equal, and the cable lengths of the several fourth cables are equal. The first cable is used to transmit the measurement signal of the AC voltage, the second cable is used to transmit the temperature measurement signal, the third cable is used to transmit the switch signal of the fast fuse state, and the fourth cable is used to transmit the control trigger signal of the power device.

[0043] Optionally, the first cable has one end connected to the input end of the fast fuse 1 of the power conversion unit, and the other end connected to the coordination controller and the pulse controller. The second cable connects the temperature measuring element and the temperature transmitter of the power conversion unit. The third cable connects the auxiliary contact of the fast fuse and the coordination controller. The fourth cable has one end connected to the control end of the power device of the power conversion unit, and the other end connected to the pulse trigger board.

[0044] In this embodiment, the measurement and control unit includes an upper bridge measurement and acquisition circuit and a lower bridge measurement and acquisition circuit. The measurement and acquisition circuits of the upper bridge and the lower bridge both include a first cable, a second cable, a third cable, and a fourth cable, wherein the several first cables of the upper bridge and the several first cables of the lower bridge are symmetrically arranged and have the same cable length, and the lengths of the other symmetrically arranged cables are the same. Since the main components of the measurement and control unit of this embodiment are arranged in the middle of the cabinet, a compact structural layout has been achieved, and the effect of reducing the volume of the cabinet is achieved compared to the prior art. This embodiment provides a more preferred method, which sets reasonable positions for the coordination controller, the pulse controller, and the temperature transmitter, so that the cable lengths of the several cables from the sampling point to the transmitter are equal, and the cable lengths of the several cables from the power device to the pulse trigger board are equal, so that the cable lengths of the cables for collecting the same type of signals are consistent (i.e., equal), avoiding inconsistent signal parameters of the same type due to unequal distances of the same type of signals, increasing the complexity of software processing, and avoiding more uncontrollable noise interference due to cable length coupling, thereby increasing the robustness and stability of the hydrogen production rectifier power supply. For example, Figure 1As shown, one end of several first cables of the upper bridge is respectively connected to the upper bridge AC sampling point 11, one end of several first cables of the lower bridge is respectively connected to the lower bridge AC sampling point 15, and the other end of the first cables of the upper and lower bridges are connected to the control main board layer (on which a coordination controller and a pulse controller are provided) 17. In other words, the cable lengths of 11, 15 to 17 are equal. One end of the second cable of the upper bridge is connected to the upper bridge temperature measurement point 13, one end of the second cable of the lower bridge is connected to the lower bridge temperature measurement point 16, and the other end of the second cables of the upper and lower bridges are connected to the transmitter layer 18. The cable lengths of several second cables are equal. In other words, the cable lengths of 13, 16 to 18 are equal. It should be noted that the measurement and acquisition loop also includes several fifth cables connected to the DC voltage sampling point 14, and the cable lengths of several fifth cables are equal. The fifth cable is used to transmit the measurement signal of the DC voltage.

[0045] Specifically, the three-phase voltage of the two bridges is collected from the input end of the fast fuse, and connected to the coordination controller and pulse controller of the measurement and control unit via a BVR1.5 copper cable (such as the first cable); the temperature measurement element of the power device uses a thermistor, one end of the thermistor is fixed on the power device, and the other end is connected to the temperature transmitter of the measurement and control unit via a lead (such as the second cable); the auxiliary contacts of the fast fuse are connected in parallel and connected to the coordination controller of the measurement and control unit via a BVR1.5 copper cable (such as the third cable); the control trigger signal line of the power device (such as the fourth cable) is connected to the trigger pulse board of the measurement and control unit at one end, and connected to the control end of the power device at the other end. Due to the large size of the traditional rectifier power supply, the sampling points are scattered in the cabinet, the distance between the sampling point and the acquisition main board, and the distance between the trigger transformer and the power device is far, and the distance of the same type of signal is different, resulting in inconsistent parameters of the same type of signal, increasing the complexity of software processing, and at the same time, the long cable between the two is easily affected by electromagnetic interference. In this embodiment, the UB bridge and the DB bridge are symmetrical up and down, and the cable lengths of the cables from each measuring point to the measurement and control unit are consistent, and the lengths of the control trigger signal lines are consistent, so that the signal delay is consistent, and there will be no inconsistent parameters (such as impedance) due to inconsistent cable lengths, and there will be no more uncontrollable noise interference due to the coupling of long cables. In addition, the UB bridge and the DB bridge are symmetrical up and down, which not only increases the energy density per unit area of ​​the power supply and reduces the cabinet volume, but also reduces the amount of DC bus and AC bus material, thereby reducing the power supply cost.

[0046] Optionally, the measurement acquisition circuit includes a high voltage analog quantity acquisition circuit. The high voltage analog quantity acquisition circuit includes an electromagnetic compatibility (EMC) anti-interference circuit, a series voltage divider circuit, a high frequency filter circuit, a follower circuit, a differential circuit, and an inverting circuit.

[0047] The EMC anti-interference circuit includes a first capacitor, a second capacitor, a third capacitor and a first inductor, the second capacitor and the third capacitor are connected in series to form a series branch, the series branch is connected in parallel with the first capacitor to form a parallel branch, and one end of the parallel branch is connected to one end of the first inductor. The series voltage divider circuit includes a first resistor and a second resistor, the first resistor is connected in series with the second resistor, the other end of the first resistor is connected to the other end of the first inductor, the second resistor is connected in parallel with the high-frequency filter circuit, and the high-frequency filter circuit includes a fourth capacitor and a fifth capacitor connected in parallel. The EMC anti-interference circuit, the series voltage divider circuit and the high-frequency filter circuit are used to convert a high voltage signal into a low voltage signal. The follower circuit includes two operational amplifiers, the differential circuit includes a plurality of resistors and two operational amplifiers, and the follower circuit and the differential circuit are used to convert the low voltage signal into an inverted unipolar signal with a voltage rise of a preset threshold. The inverting circuit includes a plurality of resistors and an operational amplifier, which is used to convert the inverted unipolar signal into a unipolar signal that is in phase with the AC input signal and has a voltage rise of a preset threshold.

[0048] In this embodiment, the number of high voltage analog quantity acquisition circuits is 6. Figure 5 and Figure 6 As shown, Figure 5 AO and Figure 6AO connection, AI refers to the input end of analog input, and AN refers to the common end of analog input. AI and AN are connected to the AC sampling point, C1, C2, and C3 are safety capacitors, and L1 forms a series mode interference and common mode interference filtering circuit, R1~R6 forms a series voltage divider circuit, and C4 and C5 form a high-pass filter circuit; A1, A2, and A3 form a differential circuit to raise the AO signal by 1.25V (that is, the preset threshold), and the output ADI after A4 inversion is in the same phase as AO. Specifically, the high-voltage analog quantity is connected from AI and AN, and passes through the EMC anti-interference circuit composed of C1, C2, C3, and L1. After the EMC anti-interference circuit, the high-voltage AC input is connected to the series voltage divider circuit composed of R1~R6, and the high-frequency filter circuit composed of C4 and C5 converts the high-voltage signal into a low-voltage signal. The small voltage signal is converted into an inverted unipolar signal with a voltage increase of 1.25V after passing through the follower circuit composed of op amps A1 and A2 and the differential circuit composed of R8~R11, A3 and A4. The inverted unipolar signal is converted into a unipolar signal with a voltage increase of 1.25V in phase with the input AC signal through the inverting circuit composed of R12, R13 and A4, and is input into the post-stage AD. The high-voltage signal at the sampling point is divided by the sampling circuit to form a small unipolar signal with the same phase as the input signal and an amplitude within 5V. The high-voltage analog quantity acquisition circuit in the traditional design uses an electromagnetic PT (Potential Transformer) to convert a high voltage into a small voltage of 3.3V. The voltage transformer is costly, large in size and weight, and is prone to ferromagnetic resonance, waveform distortion and other problems. In consideration of cost reasons, manufacturers reduce the acquisition and monitoring of analog quantities. The trigger control of the corresponding phase power device relies on the phase shift of the reference phase (i.e., the estimation result), which cannot guarantee the authenticity and real-time performance of the signal. This embodiment uses a high voltage analog quantity acquisition circuit composed of basic electronic components such as capacitors, inductors, resistors, and operational amplifiers. Compared with the traditional use of voltage transformers, it has obvious advantages in reducing costs and saving board space, reducing waveform distortion, and reducing ferromagnetic resonance. Among them, the upper and lower bridges of this embodiment can reduce 6 voltage transformers compared to conventional technologies, greatly reducing the cost of the power supply.

[0049] Optionally, the preset threshold is 1.25V.

[0050] Optionally, the measurement and control unit also includes a human-machine interface (such as a touch screen, buttons) and several sensors. The human-machine interface is used for human-machine interaction. The network topology of the hydrogen production rectifier power supply adopts a three-layer two-network architecture. The lower layer includes a temperature transmitter and several sensors, the middle layer includes a coordination controller and a pulse controller, and the upper layer includes a human-machine interface and an external process host. The coordination controller is used to communicate with the human-machine interface, the pulse controller, and the external process host through the Ethernet port, and is also used to communicate with the temperature transmitter and several sensors through the bus.

[0051] Traditionally, 4-20mA low current signals are used to exchange information between the hydrogen production rectifier power supply and the process system host. The amount of information that can be exchanged is small and the signal is easily interfered with, which is not conducive to the stability of the system. In this embodiment, the information exchange between the various intelligent units inside the hydrogen production rectifier power supply (such as coordination controller, pulse controller, human-machine interface, temperature transmitter, sensor), and the information interaction between the hydrogen production rectifier power supply and the external remote process host all use digital communication to increase the amount of interactive information and improve the degree of digitization of the hydrogen production rectifier power supply. In addition, optical fiber communication is used for the interaction between the intelligent unit and the outside to reduce delays and ensure reliability and timeliness. Specifically, Figure 7 As shown, the communication network topology in the power cabinet adopts a three-layer two-network architecture. The coordination controller communicates with the HMI (Human-Machine Interface), pulse controller, and remote process host through different Ethernet ports to achieve data interaction, and communicates with the sensor layer through the 485 bus; various parameters and set values ​​are input through the touch screen or the remote process host and saved in the coordination controller; external non-electrical protection information is input to the coordination controller, and the coordination controller determines whether to shut down or trip the high-voltage side switch; all weak current signals are concentrated in the chamber where the measurement and control unit is located. For example, the coordination controller reads the information of each sensor through the 485 bus and transmits it to the process host and HMI through the upper network, and is connected to the process host through optical fiber; the coordination controller and the pulse controller exchange data through the 2404 port of Ethernet.

[0052] Optionally, one end of the fast fuse of the electric energy conversion unit is connected in series with the RC absorption module, and the other end is connected in series with the half-bridge circuit.

[0053] In this embodiment, the AC incoming line is connected to a fast fuse after passing through a resistor-capacitor absorption module and then to a rectifier bridge. A fast fuse is used in the AC input circuit in series in a half-bridge circuit to reduce the number of fast fuses at the primary input end. Compared with the traditional hydrogen production rectifier power supply, a full bridge reduces 3. If each bridge arm adopts two thyristors in parallel mode, a full bridge can reduce 9 fast fuses. The improved design of the high-voltage analog quantity acquisition circuit and the fast fuse in this embodiment can greatly reduce the material cost, with a cost reduction of about 15%. In addition, it can simplify the production process, reduce the difficulty of installation, and ensure production quality.

[0054] Optionally, the water system includes a water inlet pipe, a water outlet pipe, a water inlet manifold, and a water outlet manifold, and the number of the water inlet pipe, the water outlet pipe, the water inlet manifold, and the water outlet manifold is 1 each.

[0055] In this embodiment, Figure 8As shown, the water system includes a water-cooled power component 3, a water jacket inlet 5, a water jacket outlet 6, an inlet water manifold 19, an outlet water manifold 20, a flow meter, etc. In a traditional design, the number of inlet water manifolds and outlet water manifolds of the water system is consistent with the number of bridges. The number of water systems in this embodiment is one set, which further reduces the cost.

[0056] The following is a description of the internal and external connections of the high energy density all-digital hydrogen production rectifier power supply of this embodiment, as well as a description of the working process:

[0057] The high energy density all-digital hydrogen production rectifier power supply is connected to the external rectifier transformer side through the upper bridge AC busbar 2 and the lower bridge AC busbar; the positive and negative electrodes of the electrolyzer are connected through the positive DC busbar 4 and the negative DC busbar; the water inlet 5 and the water outlet 6 of the power device are connected to the power device water inlet point 21 and the power device water outlet point 22; the water inlet flange 9 and the water outlet flange 10 of the water distributor are connected to the water outlet and the water inlet of the water cooling device; the AC sampling point (such as Figure 1 11, 14 and 15) are connected to the control main board of the measurement and control unit; the temperature measurement point (such as Figure 1 13, 16) are connected to the temperature transmitter of the measurement and control unit; the external cable of the control device is connected to the external system through the external terminal of the measurement and control unit; the Ethernet signal of the power supply is connected to the external remote process host through the optical fiber transceiver.

[0058] When the machine is started, the external remote process host transmits the control mode, target voltage, target current and other parameters to the coordination controller of the power supply of this embodiment through optical cable and photoelectric conversion. The microprocessor of the coordination controller parses the above-mentioned commands received, and converts them into internal protocols and transmits them to the pulse controller through the Ethernet 2404 port. The pulse control board calculates the trigger angle according to the control mode, target voltage, target current, and real-time collected voltage and current information of the process host, generates a double narrow trigger pulse, controls the pulse transformer of the pulse trigger board, triggers the power devices of the upper and lower bridges, and outputs a DC voltage.

[0059] During the hydrogen production process, the coordination controller processor detects the temperature of the power device, the flow, pressure, voltage, current and other data of the water system in real time, and packages these data in the Profinet protocol format and uploads them to the remote process host through optical fiber; the coordination controller determines the status of the system based on the detected real-time data. If a fault is found, on the one hand, it notifies the pulse controller through the 2404 port of Ethernet to block the output pulse and at the same time trips the high-voltage side switch of the rectifier transformer; if there is no fault, the pulse controller adjusts the trigger angle according to the pre-set parameters and the feedback DC voltage and current values, and adjusts the output DC voltage and current to form a closed-loop control.

[0060] When shutting down, the coordination controller processor receives the shutdown command from the process host, notifies the pulse controller, blocks the trigger pulse, and completes the hydrogen production process.

[0061] The high energy density fully digital hydrogen production rectifier power supply provided in this embodiment has the beneficial effects of small size, compact structure, high energy density per unit area, low cost, strong robustness, full digitization of interactive data between intelligent modules, and simplified production process.

[0062] Embodiment 2:

[0063] This embodiment provides a hydrogen production system, including an electrolyzer and the high energy density all-digital hydrogen production rectifier power supply described in Embodiment 1.

[0064] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A high energy density all-digital hydrogen production rectifier power supply, characterized in that: Including power conversion unit and measurement and control unit, The electric energy conversion unit is vertically arranged in the first cavity, the measurement and control unit is vertically arranged in the second cavity, the first cavity and the second cavity are arranged horizontally, and a metal isolation plate is arranged between the two cavities. The power conversion unit includes an upper bridge, a waterway system, and a lower bridge, which are arranged vertically from top to bottom. The upper bridge and the lower bridge are symmetrical. The measurement and control unit includes a coordination controller, a pulse controller, a pulse trigger board, and a temperature transmitter, and the four are located between the upper bridge and the lower bridge.

2. The high energy density all-digital hydrogen production rectifier power supply according to claim 1 is characterized in that: The measurement and control unit also includes a measurement acquisition circuit. The measurement acquisition loop includes a first cable, a second cable, a third cable, and a fourth cable. Among them, the number of the first cable, the second cable, the third cable, and the fourth cable are all several, the cable lengths of the several first cables are all equal, the cable lengths of the several second cables are all equal, the cable lengths of the several third cables are all equal, and the cable lengths of the several fourth cables are all equal.

3. The high energy density all-digital hydrogen production rectifier power supply according to claim 2 is characterized in that: The first cable has one end connected to the input end of the fast fuse and the other end connected to the coordination controller and the pulse controller. The second cable connects the temperature measuring element and the temperature transmitter. The third cable connects the auxiliary contacts of the fast fuse and the coordination controller. A fourth cable has one end connected to the control end of the power device and the other end connected to the pulse trigger board.

4. The high energy density all-digital hydrogen production rectifier power supply according to claim 1 is characterized in that: The measurement acquisition circuit includes a high voltage analog quantity acquisition circuit. The high voltage analog quantity acquisition circuit includes an electromagnetic compatibility (EMC) anti-interference circuit, a series voltage divider circuit, a high-frequency filter circuit, a follower circuit, a differential circuit, and an inverting circuit. The EMC anti-interference circuit includes a first capacitor, a second capacitor, a third capacitor and a first inductor. The second capacitor and the third capacitor are connected in series to form a series branch. The series branch is connected in parallel with the first capacitor to form a parallel branch. One end of the parallel branch is connected to one end of the first inductor. The series voltage divider circuit includes a first resistor and a second resistor, the first resistor and the second resistor are connected in series, the other end of the first resistor is connected to the other end of the first inductor, the second resistor is connected in parallel with the high-frequency filter circuit, and the high-frequency filter circuit includes a fourth capacitor and a fifth capacitor connected in parallel, EMC anti-interference circuit, series voltage divider circuit and high-frequency filter circuit are used to convert high voltage signals into low voltage signals. The follower circuit includes two operational amplifiers, and the differential circuit includes a plurality of resistors and two operational amplifiers. The follower circuit and the differential circuit are used to convert a small voltage signal into an inverted unipolar signal with a voltage rise of a preset threshold. The inverting circuit includes a plurality of resistors and an operational amplifier, and is used for converting the inverted unipolar signal into a unipolar signal which is in phase with the AC input signal and whose voltage is raised by a preset threshold.

5. The high energy density all-digital hydrogen production rectifier power supply according to claim 4 is characterized in that: The preset threshold is 1.25V.

6. The high energy density all-digital hydrogen production rectifier power supply according to claim 1 is characterized in that: The measurement and control unit also includes a human-machine interface and several sensors. Human-machine interface, used for human-machine interaction, The network topology of the hydrogen production rectifier power supply adopts a three-layer two-network architecture. The lower layer includes a temperature transmitter and several sensors, the middle layer includes a coordination controller and a pulse controller, and the upper layer includes a human-machine interface and an external process host. The coordination controller is used to communicate with the human-machine interface, the pulse controller, and the external process host through the Ethernet port, and is also used to communicate with the temperature transmitter and several sensors through the bus.

7. The high energy density all-digital hydrogen production rectifier power supply according to claim 1 is characterized in that: The fast fuse of the electric energy conversion unit has one end connected in series with the RC absorption module and the other end connected in series with the half-bridge circuit.

8. The high energy density all-digital hydrogen production rectifier power supply according to claim 1 is characterized in that: The water system includes water inlet pipe, water outlet pipe, water inlet manifold, water outlet manifold, The number of the water inlet pipe, the water outlet pipe, the water inlet manifold, and the water outlet manifold is 1 each.

9. The high energy density all-digital hydrogen production rectifier power supply according to claim 1 is characterized in that: Both the upper and lower bridges are fully controlled bridges.

10. A hydrogen production system, characterized in that: It comprises an electrolyzer and a high energy density fully digital hydrogen production rectifier power supply as described in any one of claims 1-9.

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