Hydrogen production power supply system

Abstract

The utility model provides a kind of hydrogen production power supply system, comprising: hydrogen production power supply, input end is connected with the A, B, C three-phase of three-phase power grid;Electrolytic cell, input end is connected with the output end of hydrogen production power supply, negative pole ground;Insulation detection unit connected between the input end of three-phase power grid and hydrogen production power supply, comprising: controller connected with hydrogen production power supply and first isolated sampling module, second isolated sampling module and third isolated sampling module all being connected with controller, the first input end of three is respectively connected with the A, B, C three-phase of three-phase power grid, second input end all ground;First isolated sampling module, second isolated sampling module and third isolated sampling module respectively to A, B, C three-phase-to-ground ac voltage isolated sampling send controller, controller is used to when detecting the ac voltage signal exception of A, B, C three-phase to hydrogen production power supply sends alarm signal.The utility model can effectively monitor the ground insulation condition of each phase line of ac input end.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen production power technology, and in particular relates to a hydrogen production power system. Background Technology

[0002] In existing hydrogen production power systems, a three-phase three-wire IT system (ungrounded input power supply system) is commonly used to supply power. Meanwhile, the most common electrolyzers are currently alkaline water electrolyzers. Considering the safety of alkaline water electrolyzers, the cathode portion of the electrolyzer is grounded during operation. Therefore, the overall power supply system connection diagram is as follows: Figure 1 As shown.

[0003] For IT systems, grounding insulation abnormalities may go undetected without targeted testing. Therefore, even if a short circuit to ground occurs in the power supply before system startup, the hydrogen production power supply will continue operating and connect to the already grounded electrolyzer, resulting in a situation similar to... Figure 2 The system connection diagram is shown.

[0004] But regardless of whether it is based on thyristor type (such as Figure 3 Hydrogen production power source based on IGBTs (such as...) Figure 4 If the hydrogen production power supply is short-circuited to ground, and the unit is started, the power supply, hydrogen production power supply, and electrolyzer will form a short-circuit loop through the grounding wire, generating a large short-circuit surge current that will damage the hydrogen production power supply. Utility Model Content

[0005] This invention provides a hydrogen production power supply system, which aims to solve the technical problem that existing hydrogen production power supply systems lack relevant input-to-ground insulation detection, which can easily lead to damage to the hydrogen production power supply.

[0006] This invention is implemented as follows: a hydrogen production power system, comprising: A hydrogen production power supply, wherein the input terminal of the hydrogen production power supply is connected to the A, B, and C phases of a three-phase power grid; An electrolyzer, wherein the input terminal of the electrolyzer is connected to the output terminal of the hydrogen production power source, and the negative terminal of the electrolyzer is grounded; and An insulation detection unit is connected between the three-phase power grid and the input terminal of the hydrogen production power supply. The insulation detection unit includes: a controller connected to the hydrogen production power supply and a first isolation sampling module, a second isolation sampling module, and a third isolation sampling module, all of which are connected to the controller. The first input terminals of the first isolation sampling module, the second isolation sampling module, and the third isolation sampling module are respectively connected to the A, B, and C phases of the three-phase power grid, and the second input terminals of all three are grounded. The first isolation sampling module isolates and samples the AC voltage of phase A of the three-phase power grid relative to the ground terminal and sends it to the controller. The second isolation sampling module isolates and samples the AC voltage of phase B of the three-phase power grid relative to the ground terminal and sends it to the controller. The third isolation sampling module isolates and samples the AC voltage of phase C of the three-phase power grid relative to the ground terminal and sends it to the controller. The controller is used to send an alarm signal to the hydrogen production power source when it detects abnormal AC voltage signals of phases A, B, and C.

[0007] Furthermore, the first isolation sampling module includes a first resistor, a second resistor, and a first isolation chip, the first isolation chip being connected to the controller; One end of the first resistor is connected to phase A of the three-phase power grid, and the other end is connected to the first isolation chip; One end of the second resistor is grounded, and the other end is connected to the first isolation chip.

[0008] Furthermore, the first isolation chip is an optocoupler chip.

[0009] Furthermore, the second isolation sampling module includes a third resistor, a fourth resistor, and a second isolation chip, the second isolation chip being connected to the controller; One end of the third resistor is connected to phase B of the three-phase power grid, and the other end is connected to the second isolation chip; One end of the fourth resistor is grounded, and the other end is connected to the second isolation chip.

[0010] Furthermore, the second isolation chip is an optocoupler chip.

[0011] Furthermore, the third isolation sampling module includes a fifth resistor, a sixth resistor, and a third isolation chip, the third isolation chip being connected to the controller; One end of the fifth resistor is connected to phase C of the three-phase power grid, and the other end is connected to the third isolation chip; One end of the sixth resistor is grounded, and the other end is connected to the third isolation chip.

[0012] Furthermore, the third isolation chip is an optocoupler chip.

[0013] Furthermore, the controller is a DSP chip or a microcontroller.

[0014] Furthermore, the insulation detection unit is built into the hydrogen production power supply; or The insulation detection unit is an independent device externally located within the hydrogen production power source.

[0015] In the hydrogen production power system of this embodiment, an insulation detection unit for each phase line to ground is added to the AC input terminal of the hydrogen production power supply. The insulation detection unit includes a controller, a first isolation sampling module, a second isolation sampling module, and a third isolation sampling module. These modules isolate and sample the AC voltage of each phase line to ground before the hydrogen production power supply starts its main power circuit or before connecting to the electrolyzer, enabling the controller to monitor the insulation status of each phase line to ground at the AC input terminal in real time. Once an abnormal insulation condition is detected, the controller sends an alarm signal to the hydrogen production power supply, causing it to stop operating and not connect to the electrolyzer load, thus preventing short-circuit faults. Only when the insulation of each phase line to ground is normal is the hydrogen production power supply allowed to start normally and connect to the electrolyzer load to provide normal power to the electrolyzer, ensuring the electrical safety of the system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a hydrogen production power system provided by existing technology; Figure 2 yes Figure 1 The diagram shows the hydrogen production power system after the input AC power is grounded. Figure 3 yes Figure 1 The diagram shows a hydrogen production power system (thyristor-type hydrogen production power supply) where a short-circuit loop is formed after the input AC power is grounded. Figure 4 yes Figure 1 The diagram shows a hydrogen production power system (IGBT type hydrogen production power supply) where a short-circuit loop is formed after the input AC power is grounded. Figure 5 This is a schematic diagram of the hydrogen production power supply system provided in this embodiment of the utility model; Figure 6 This is a circuit diagram of the insulation detection unit provided in an embodiment of the present invention.

[0017] Explanation of key component symbols: Insulation detection unit-10; Controller-11; First isolation sampling module-12; First resistor-R1; Second resistor-R2; First isolation chip-U1; Second isolation sampling module-13; Third resistor-R3; Fourth resistor-R4; Second isolation chip-U2; Third isolation sampling module-14; Fifth resistor-R5; Sixth resistor-R6; Third isolation chip-U3; Hydrogen power supply-20; Electrolyzer-30. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0019] In the description of this utility model, it should be understood that the orientation or positional relationship indicated in the description of direction and positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of the present invention.

[0022] Furthermore, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0023] Please see Figure 5 and Figure 6 The hydrogen production power system of this utility model embodiment includes: Hydrogen power supply 20, the input terminal of hydrogen power supply 20 is connected to the A, B and C phases of the three-phase power grid; Electrolyzer 30, the input terminal of which is connected to the output terminal of hydrogen production power supply 20, and the negative terminal of electrolyzer 30 is grounded; and An insulation detection unit 10 is connected between the three-phase power grid and the input terminal of the hydrogen production power supply 20. The insulation detection unit 10 includes: a controller 11 connected to the hydrogen production power supply 20 and a first isolation sampling module 12, a second isolation sampling module 13 and a third isolation sampling module 14, all of which are connected to the controller 11. The first input terminals of the first isolation sampling module 12, the second isolation sampling module 13 and the third isolation sampling module 14 are respectively connected to the A, B and C phases of the three-phase power grid, and the second input terminals of the three modules are all grounded. The first isolation sampling module 12 isolates and samples the AC voltage of phase A of the three-phase power grid relative to the ground terminal and sends it to the controller 11. The second isolation sampling module 13 isolates and samples the AC voltage of phase B of the three-phase power grid relative to the ground terminal and sends it to the controller 11. The third isolation sampling module 14 isolates and samples the AC voltage of phase C of the three-phase power grid relative to the ground terminal and sends it to the controller 11. The controller 11 is used to send an alarm signal to the hydrogen production power supply 20 when it detects abnormal AC voltage signals of phases A, B, and C.

[0024] In the hydrogen production power system of this embodiment, an insulation detection unit 10 for each phase line to ground is added to the AC input terminal of the hydrogen production power supply 20. The insulation detection unit 10 includes a controller 11, a first isolation sampling module 12, a second isolation sampling module 13, and a third isolation sampling module 14. The first isolation sampling module 12, the second isolation sampling module 13, and the third isolation sampling module 14 isolate and sample the AC voltage of each phase line to ground before the hydrogen production power supply 20 starts its main power circuit or before the hydrogen production power supply 20 is connected to the electrolyzer 30, so that the controller 11 can detect the insulation status of each phase line to ground at the AC input terminal in real time. Once an abnormal insulation of each phase line to ground is detected, the controller 11 sends an alarm signal to the hydrogen production power supply 20, causing the hydrogen production power supply 20 to stop working and not connect to the load of the electrolyzer 30, thus avoiding a short circuit fault. Only when the insulation of each phase line to ground is normal is the hydrogen production power supply 20 allowed to start normally to connect to the load of the electrolyzer 30, providing normal power to the electrolyzer 30 and ensuring the electrical safety of the system.

[0025] Furthermore, the controller 11 is a DSP chip or a microcontroller; any commercially available DSP chip or microcontroller will suffice. Preferably, the controller 11 is a DSP chip.

[0026] Specifically, the DSP chip, as the core processing element of the insulation detection unit 10, is used to receive the AC voltage signals to ground of the three phases A, B, and C after isolation sampling. By analyzing and processing the AC voltage signals to ground of the three phases A, B, and C respectively, the insulation detection function is realized. When an abnormality is detected, an alarm signal is sent to the hydrogen power supply 20 to stop the hydrogen power supply 20 from working and avoid the occurrence of short circuit.

[0027] Please see Figure 5 and Figure 6 Furthermore, the first isolation sampling module 12 includes a first resistor R1, a second resistor R2 and a first isolation chip U1. The first isolation chip U1 is connected to the controller 11. One end of the first resistor R1 is connected to phase A of the three-phase power grid, and the other end is connected to the first isolation chip U1. One end of the second resistor R2 is grounded, and the other end is connected to the first isolation chip U1.

[0028] Specifically, in this embodiment, the first isolation sampling module 12 serves as the detection branch of phase A in the three-wire power grid. It is connected in series with a first resistor R1 and a second resistor R2 before being grounded (PE), forming a voltage divider circuit. The first resistor R1 and the second resistor R2 limit the current and divide the voltage, providing a suitable signal for subsequent sampling. The first isolation chip U1 is located between the voltage divider resistors R1 / R2 and the controller 11, achieving electrical isolation and preventing high-voltage lines from interfering with or damaging low-voltage control components such as the controller 11, thus ensuring system safety. The controller 11 receives the AC voltage signal of phase A after isolation sampling, analyzes and calculates the AC voltage signal, and sends an alarm signal to the hydrogen production power supply 20 when an abnormal AC voltage signal is detected, causing it to stop working.

[0029] Please see Figure 5 and Figure 6 Furthermore, the second isolation sampling module 13 includes a third resistor R3, a fourth resistor R4 and a second isolation chip U2. The second isolation chip U2 is connected to the controller 11. One end of the third resistor R3 is connected to phase B of the three-phase power grid, and the other end is connected to the second isolation chip U2. One end of the fourth resistor R4 is grounded, and the other end is connected to the second isolation chip U2.

[0030] Specifically, in this embodiment, the second isolation sampling module 13 serves as the detection branch of phase B in the three-phase power grid. It is connected in series with the third resistor R3 and the fourth resistor R4 and then grounded (PE) to form a voltage divider circuit. The third resistor R3 and the fourth resistor R4 are used to limit the current and divide the voltage, providing a suitable signal for subsequent sampling. The second isolation chip U2 is located between the voltage divider resistors R3 / R4 and the controller 11, achieving electrical isolation and preventing high-voltage lines from interfering with or damaging low-voltage control components such as the controller 11, thus ensuring system safety. The controller 11 receives the AC voltage signal of phase B after isolation sampling, analyzes and calculates the AC voltage signal, and sends an alarm signal to the hydrogen production power supply 20 when an abnormal AC voltage signal is detected, causing it to stop working.

[0031] Please see Figure 5 and Figure 6Furthermore, the third isolation sampling module 14 includes a fifth resistor R5, a sixth resistor R6, and a third isolation chip U3, which is connected to the controller 11. One end of the fifth resistor R5 is connected to phase C of the three-phase power grid, and the other end is connected to the third isolation chip U3. One end of the sixth resistor R6 is grounded, and the other end is connected to the third isolation chip U3.

[0032] Specifically, in this embodiment, the third isolation sampling module 14 serves as the detection branch for phase C in the three-phase power grid. It is connected in series with the fifth resistor R5 and the sixth resistor R6 and then grounded (PE) to form a voltage divider circuit. The fifth resistor R5 and the sixth resistor R6 limit the current and divide the voltage, providing a suitable signal for subsequent sampling. The third isolation chip U3 is located between the voltage divider resistors R5 / R6 and the controller 11, achieving electrical isolation and preventing high-voltage lines from interfering with or damaging low-voltage control components such as the controller 11, thus ensuring system safety. The controller 11 receives the AC voltage signal of phase C after isolation sampling, analyzes and calculates the AC voltage signal, and sends an alarm signal to the hydrogen production power supply 20 when an abnormal AC voltage signal is detected, causing it to stop working.

[0033] Furthermore, in this embodiment, the first isolation chip U1, the second isolation chip U2, and the third isolation chip U3 are all optocoupler chips.

[0034] The insulation detection unit 10 of this embodiment mainly consists of three structurally similar detection branches (i.e., the first isolation sampling module 12, the second isolation sampling module 13, and the third isolation sampling module 14) and a DSP chip (i.e., the controller 11), wherein: Each detection branch corresponds to a phase line (A, B, C phase) of a three-phase power grid. The detection branch contains two resistors connected in series. One end of the resistor is connected to the AC input terminal (i.e., connected to the corresponding phase line), and the other end is grounded (PE). The function of the series resistor is to divide the voltage between the AC input terminal and the ground terminal to prevent excessively high voltage from directly entering the subsequent circuit. An isolation chip is connected after the resistor. The isolation chip is connected to the DSP chip. The isolation chip is used to achieve electrical isolation to prevent high voltage in the line from interfering with or damaging low voltage control parts such as the DSP chip, and to ensure the safety and stability of the detection branch. The DSP chip, as the core processing element, is used to receive the AC voltage signal to ground after isolation and sampling of the phase line, analyze and process the AC voltage signal, and send an alarm signal to the hydrogen power supply 20 when an abnormality is detected, so that the hydrogen power supply 20 stops working, avoids the occurrence of short circuit, and realizes the insulation detection function.

[0035] The insulation detection unit 10 of this embodiment of the invention can indirectly assess the insulation status of each phase line (A, B, C phases) of a three-phase power grid relative to the grounding terminal (PE) by detecting the AC voltage signal. Under normal insulation conditions, the insulation between the phase line and the grounding terminal is good, the leakage current between them is small, and the sampling voltage is stable within a reasonable range. When the insulation deteriorates, the leakage current between them increases, causing a voltage change on the voltage divider resistor. The DSP chip analyzes this voltage change to detect and determine whether the insulation between the phase line and the grounding terminal is abnormal. If an abnormality is detected, an alarm signal is sent to the hydrogen production power supply 20 to stop its operation. This simple and effective method achieves real-time monitoring of the insulation status of each phase line of the three-phase power grid.

[0036] The insulation detection unit 10 of this utility model embodiment is an insulation detection circuit, which can be built into the hydrogen power supply 20, thereby improving the integration of the hydrogen power supply 20 and the hydrogen power supply system; or, the insulation detection unit 10 can be an independent device external to the hydrogen power supply 20, which can be independently assembled and connected with the hydrogen power supply 20 as an independent device, which is convenient for production, assembly and maintenance, etc.

[0037] In this specification, the terms "in one embodiment," "in another embodiment," etc., refer to specific features, structures, materials, or characteristics described in connection with embodiments or examples that are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydrogen production power system, characterized in that, include: A hydrogen production power supply, wherein the input terminal of the hydrogen production power supply is connected to the A, B, and C phases of a three-phase power grid; An electrolyzer, wherein the input end of the electrolyzer is connected to the output end of the hydrogen production power supply, and the negative terminal of the electrolyzer is grounded; as well as An insulation detection unit is connected between the three-phase power grid and the input terminal of the hydrogen production power supply. The insulation detection unit includes: a controller connected to the hydrogen production power supply and a first isolation sampling module, a second isolation sampling module, and a third isolation sampling module, all of which are connected to the controller. The first input terminals of the first isolation sampling module, the second isolation sampling module, and the third isolation sampling module are respectively connected to the A, B, and C phases of the three-phase power grid, and the second input terminals of all three are grounded. The first isolation sampling module isolates and samples the AC voltage of phase A of the three-phase power grid relative to the ground terminal and sends it to the controller. The second isolation sampling module isolates and samples the AC voltage of phase B of the three-phase power grid relative to the ground terminal and sends it to the controller. The third isolation sampling module isolates and samples the AC voltage of phase C of the three-phase power grid relative to the ground terminal and sends it to the controller. The controller is used to send an alarm signal to the hydrogen production power source when it detects abnormal AC voltage signals of phases A, B, and C.

2. The hydrogen production power system according to claim 1, characterized in that, The first isolation sampling module includes a first resistor, a second resistor, and a first isolation chip, the first isolation chip being connected to the controller; One end of the first resistor is connected to phase A of the three-phase power grid, and the other end is connected to the first isolation chip; One end of the second resistor is grounded, and the other end is connected to the first isolation chip.

3. The hydrogen production power system according to claim 2, characterized in that, The first isolation chip is an optocoupler chip.

4. The hydrogen production power system according to claim 1, characterized in that, The second isolation sampling module includes a third resistor, a fourth resistor, and a second isolation chip, the second isolation chip being connected to the controller; One end of the third resistor is connected to phase B of the three-phase power grid, and the other end is connected to the second isolation chip; One end of the fourth resistor is grounded, and the other end is connected to the second isolation chip.

5. The hydrogen production power system according to claim 4, characterized in that, The second isolation chip is an optocoupler chip.

6. The hydrogen production power system according to claim 1, characterized in that, The third isolation sampling module includes a fifth resistor, a sixth resistor, and a third isolation chip, and the third isolation chip is connected to the controller. One end of the fifth resistor is connected to phase C of the three-phase power grid, and the other end is connected to the third isolation chip; One end of the sixth resistor is grounded, and the other end is connected to the third isolation chip.

7. The hydrogen production power system according to claim 6, characterized in that, The third isolation chip is an optocoupler chip.

8. The hydrogen production power system according to claim 1, characterized in that, The controller is a DSP chip or a microcontroller.

9. The hydrogen production power system according to claim 1, characterized in that, The insulation detection unit is built into the hydrogen production power supply; or The insulation detection unit is an independent device externally located within the hydrogen production power source.

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