A method and device for adjusting a converter of a hydrogen production system

Abstract

The present invention relates to the technical field of photovoltaic electrolysis hydrogen production, and in particular to a method and device for adjusting a converter of a hydrogen production system. The method obtains parameters of a photovoltaic power generation device under the highest irradiance obtained by a measuring device; wherein the parameters under the highest irradiance include the maximum power generation power and the corresponding voltage under the highest irradiance; and then, based on the voltage and known electrolyzer parameters, adjusts the target parameter values ​​of the converter; wherein the target parameter values ​​include the inductance value, the minimum input capacitance value, and the minimum output capacitance value. The numerical values ​​of the target parameters in the converter are set according to the above calculation results. Then, when the photovoltaic power generation system generates electricity at the maximum power point under the highest irradiance in the area, the output voltage of the converter and the current passing through the load are exactly consistent with the voltage and current of the electrolyzer system under the rated operating conditions, so that the electrolyzer can stably produce hydrogen at the rated power. Therefore, the above technical solution can improve the efficiency of the hydrogen production system.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic electrolysis hydrogen production, and in particular to a method and device for regulating a converter of a hydrogen production system. Background Art

[0002] The connection methods between the photovoltaic power generation system and the water electrolysis hydrogen production system are divided into direct coupling and indirect coupling. In the direct coupling method, the photovoltaic array is directly connected to the electrolyzer. The structure is relatively simple and the energy loss is small. However, it is necessary to design the series and parallel connection of the photovoltaic strings in the photovoltaic array and the series connection number of the electrolytic cell units in the electrolyzer so that the voltage and current of the two sides are directly matched. There are problems such as poor dynamic adjustability. In the indirect coupling method, the photovoltaic power generation system is connected to the electrolyzer through the use of converters, controllers and batteries. Among them, the converter helps to match the voltage and current of the two sides. This is the connection method currently adopted by most photovoltaic electrolysis systems.

[0003] However, the existing technology requires frequent calculation of values ​​such as the second-order derivative of voltage changes, places high demands on the accuracy of sensors used in photovoltaic power generation systems, and the algorithm process is also relatively complex, which leads to low efficiency of the hydrogen production system.

[0004] Therefore, the present invention proposes a method and device for adjusting a converter of a hydrogen production system to solve the technical problem of low efficiency of the hydrogen production system. Summary of the Invention

[0005] The present invention describes a method and device for regulating a converter of a hydrogen production system, which can improve the efficiency of the hydrogen production system.

[0006] According to a first aspect, the present invention provides a method for regulating a converter of a hydrogen production system, which is applied to a controller of a photovoltaic electrolysis hydrogen production system. The photovoltaic electrolysis hydrogen production system includes a photovoltaic power generation device, a measuring device, a converter, and an electrolysis device. The photovoltaic power generation device, the converter, and the electrolysis device are connected in sequence. The controller is connected to the measuring device and the converter, respectively. The measuring device is connected to the photovoltaic power generation device. The method includes:

[0007] Obtaining parameters of the photovoltaic power generation device under the highest irradiance obtained by the measuring device; wherein the parameters under the highest irradiance include the maximum power generation power and the corresponding voltage under the highest irradiance;

[0008] Based on the input voltage and known electrolytic cell parameters, target parameter values ​​of the converter are adjusted; wherein the target parameter values ​​include an inductance value, a minimum input capacitance value, and a minimum output capacitance value.

[0009] According to a second aspect, a control device for active power distribution of a multi-machine parallel system is applied to a controller of a photovoltaic electrolysis hydrogen production system, wherein the photovoltaic electrolysis hydrogen production system includes a photovoltaic power generation device, a measuring device, a converter, and an electrolysis device, wherein the photovoltaic power generation device, the converter, and the electrolysis device are connected in sequence, the controller is connected to the measuring device and the converter, respectively, and the measuring device is connected to the photovoltaic power generation device, and the device includes:

[0010] an acquisition unit configured to acquire parameters of the photovoltaic power generation device under the highest irradiance obtained by the measuring device; wherein the parameters under the highest irradiance include the maximum power generation power and the corresponding voltage under the highest irradiance;

[0011] The regulating unit is configured to regulate target parameter values ​​of the converter based on the voltage and known electrolytic cell parameters; wherein the target parameter values ​​include an inductance value, a minimum input capacitance value, and a minimum output capacitance value.

[0012] In a third aspect, an embodiment of this specification further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method described in any embodiment of this specification is implemented.

[0013] In a fourth aspect, an embodiment of this specification further provides a computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to execute the method described in any embodiment of this specification.

[0014] According to a method and device for adjusting a converter of a hydrogen production system provided by the present invention, the parameters of a photovoltaic power generation device under the highest irradiance obtained by a measuring device are obtained; wherein the parameters under the highest irradiance include the maximum power generation power and the corresponding voltage under the highest irradiance; then, based on the voltage and known electrolyzer parameters, the target parameter values ​​of the converter are adjusted; wherein the target parameter values ​​include the inductance value, the minimum input capacitance value and the minimum output capacitance value, so that the electrolyzer can stably produce hydrogen at the rated power. Therefore, the above technical solution can improve the efficiency of the hydrogen production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1A schematic flow chart of a method for adjusting a converter of a hydrogen production system according to an embodiment is shown;

[0017] Figure 2 A schematic block diagram of a regulating device for a converter of a hydrogen production system according to an embodiment is shown;

[0018] Figure 3 A flow chart of a perturbation and observation method according to one embodiment is shown;

[0019] Figure 4 shows a converter topology diagram according to one embodiment;

[0020] Figure 5 shows a graph showing changes in solar irradiance during a day according to one embodiment;

[0021] Figure 6 A structural schematic diagram of a hydrogen production system according to an embodiment is shown. DETAILED DESCRIPTION

[0022] The solution provided by the present invention is described below with reference to the accompanying drawings.

[0023] Figure 1 The flow chart of a method for adjusting a converter of a hydrogen production system according to an embodiment is shown. It is understood that the method can be executed by any device, equipment, platform, or equipment cluster with computing and processing capabilities. Figure 1 As shown, a controller is applied to a photovoltaic electrolysis hydrogen production system, the photovoltaic electrolysis hydrogen production system includes a photovoltaic power generation device, a measuring device, a converter and an electrolysis device, the photovoltaic power generation device, the converter and the electrolysis device are connected in sequence, the controller is connected to the measuring device and the converter respectively, and the measuring device is connected to the photovoltaic power generation device, and the method includes:

[0024] Step 100: Obtain parameters of the photovoltaic power generation device under the highest irradiance obtained by a measuring device; wherein the parameters under the highest irradiance include the maximum power generation power and the corresponding voltage under the highest irradiance;

[0025] Step 102: Based on the input voltage and known electrolytic cell parameters, adjust the target parameter values ​​of the converter; wherein the target parameter values ​​include the inductance value, the minimum input capacitance value, and the minimum output capacitance value.

[0026] In this embodiment, if Figure 6As shown, by obtaining the parameters of the photovoltaic power generation device under the highest irradiance obtained by the measuring device; wherein, the parameters under the highest irradiance include the maximum power generation power and the corresponding voltage under the highest irradiance, and then, based on the voltage and the known electrolyzer parameters, the target parameter value of the converter is adjusted; wherein, the target parameter value includes the inductance value, the minimum input capacitance value and the minimum output capacitance value, and the numerical values ​​of the target parameters in the converter are set according to the above calculation results. Then, when the photovoltaic power generation system generates electricity at the maximum power point under the highest irradiance in the area, the output voltage of the converter and the current passing through the load are exactly consistent with the voltage and current under the rated operating conditions of the electrolyzer system, so that the electrolyzer system can stably produce hydrogen at the rated power. Therefore, the above technical solution can improve the efficiency of the hydrogen production system.

[0027] In this embodiment, by periodically applying small voltage disturbances to the output voltage of the photovoltaic module and observing whether the output power of the photovoltaic module increases or decreases before and after the disturbance, the maximum power point is gradually approached. Figure 3 As shown, the present invention uses the perturbation observation method to track the maximum power point of the photovoltaic power generation system, thereby improving the efficiency of photovoltaic power generation. A simple MPPT control algorithm is used to ensure that in the photovoltaic indirect coupled hydrogen production system, no matter how the solar irradiance changes, the photovoltaic array system always operates at the maximum power point, and the power consumption of the electrolyzer system is always within the safe operating range, thereby effectively improving the efficiency and safety of the hydrogen production system.

[0028] In one embodiment of the present invention, the electrolytic cell parameters include output voltage, current, diode forward voltage drop, switch tube switching frequency, inductor current ripple, maximum safe power and minimum safe power.

[0029] In one embodiment of the present invention, the converter includes an input capacitor, a switching tube, a diode, an inductor and an output capacitor, the first end of the input capacitor is respectively connected to the positive electrode of the input voltage and the first end of the switching tube, the second end of the switching tube is respectively connected to the negative electrode of the diode and the first end of the inductor, the second end of the inductor is respectively connected to the first end of the output capacitor and the first end of the electrolysis device, the second end of the input capacitor, the positive electrode of the diode, the second end of the output capacitor and the second end of the electrolysis device are all connected to the negative electrode of the input voltage.

[0030] See also Figure 4In this embodiment, the converter can adjust the on and off time of the switch tube so that the input voltage is reduced to the required output voltage level on average over time. When the switch tube is driven to a high level, the switch tube is turned on and the diode is turned off. The input voltage charges the output capacitor through the energy storage inductor, providing electrical energy to the electrolysis device, and the current flowing through the inductor increases linearly; when the switch tube is driven to a low level, the switch tube is turned off, the energy storage inductor continues to flow to generate reverse electromotive force, the current flowing through the inductor decreases linearly, and the output voltage is maintained by the output capacitor and the inductor current.

[0031] An input capacitor is added to the input end of the converter because in actual applications, the photovoltaic power generation system may be far away, so there are long wirings and correspondingly large parasitic inductance. The photovoltaic power generation system cannot respond quickly to the input current requirements of the converter, and the added input capacitor can help solve this problem.

[0032] In one embodiment of the present invention, the inductance value is determined by the following formula:

[0033]

[0034] Where L is the inductance, V i is the input voltage, V o is the output voltage, V d is the forward conduction voltage drop of the diode, f is the switching frequency of the switch tube, ΔI L is the inductor current ripple.

[0035] In one embodiment of the present invention, the minimum input capacitance is determined by the following formula:

[0036]

[0037] Where C imin is the minimum input capacitance, I o For current.

[0038] In one embodiment of the present invention, the minimum value of the output capacitance is determined by the following formula:

[0039]

[0040] Where C omin is the minimum value of output capacitance.

[0041] In one embodiment of the present invention, the method further comprises:

[0042] When the generated power is greater than or equal to the minimum safe power, the electrolysis device is turned on;

[0043] When the generated power is less than the minimum safe power, the electrolysis device is shut down.

[0044] In this embodiment, the shape of the photovoltaic power generation curve in an actual day is similar to Figure 5 The PV power generation gradually increases in the morning, reaches its peak at noon, and then gradually decreases in the afternoon. Therefore, a sensor detects the PV array power generation. In the morning, if the sensor detects that the power is greater than or equal to the minimum safe power of the electrolyzer, the electrolyzer system switch is closed and the electrolyzer system starts operating. In the afternoon, if the sensor detects that the power is less than the minimum safe power of the electrolyzer system, the sensor turns off the electrolyzer system and the electrolyzer system stops operating.

[0045] According to another embodiment, the present invention provides a regulating device for a converter of a hydrogen production system. Figure 2 A schematic block diagram of a regulating device for a hydrogen production system converter according to an embodiment is shown. It is understood that the device can be implemented by any device, equipment, platform, or device cluster with computing and processing capabilities. Figure 2 As shown, a controller is applied to a photovoltaic electrolysis hydrogen production system. The photovoltaic electrolysis hydrogen production system includes a photovoltaic power generation device, a measuring device, a converter, and an electrolysis device. The photovoltaic power generation device, the converter, and the electrolysis device are connected in sequence. The controller is connected to the measuring device and the converter respectively, and the measuring device is connected to the photovoltaic power generation device. The device includes: an acquisition unit 200 and an adjustment unit 202. The main functions of each component unit are as follows:

[0046] An acquisition unit 200 is configured to acquire parameters of the photovoltaic power generation device under the highest irradiance obtained by the measuring device; wherein the parameters under the highest irradiance include the maximum power generation and the corresponding voltage under the highest irradiance;

[0047] The adjustment unit 202 is configured to adjust target parameter values ​​of the converter based on the voltage and known electrolytic cell parameters; wherein the target parameter values ​​include inductance value, minimum input capacitance value and minimum output capacitance value.

[0048] According to another embodiment, there is also provided a computer readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to execute a combination of Figure 1 The method described.

[0049] According to another embodiment, an electronic device is provided, including a memory and a processor, wherein the memory stores an executable code, and when the processor executes the executable code, the Figure 1 method.

[0050] The various embodiments of the present invention are described in a progressive manner. Similar portions between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the device embodiments are generally similar to the method embodiments, so their description is relatively simple. For relevant portions, refer to the description of the method embodiments.

[0051] Those skilled in the art will appreciate that, in one or more of the above examples, the functions described herein may be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions may be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium.

[0052] The above specific implementation methods further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for adjusting a converter of a hydrogen production system, characterized in that: A controller for a photovoltaic electrolysis hydrogen production system, wherein the photovoltaic electrolysis hydrogen production system includes a photovoltaic power generation device, a measuring device, a converter, and an electrolysis device, wherein the photovoltaic power generation device, the converter, and the electrolysis device are connected in sequence, the controller is connected to the measuring device and the converter, respectively, and the measuring device is connected to the photovoltaic power generation device, and the method includes: Obtaining parameters of the photovoltaic power generation device under the highest irradiance obtained by the measuring device; wherein the parameters under the highest irradiance include the maximum power generation power and the corresponding voltage under the highest irradiance; Adjusting target parameter values ​​of the converter based on the voltage and known electrolytic cell parameters; wherein the target parameter values ​​include an inductance value, a minimum input capacitance value, and a minimum output capacitance value; The electrolytic cell parameters include output voltage, current, diode forward voltage drop, switch tube switching frequency, inductor current ripple, maximum safe power and minimum safe power; The converter includes an input capacitor, a switching tube, a diode, an inductor, and an output capacitor. The first end of the input capacitor is connected to the positive electrode of the input voltage and the first end of the switching tube respectively. The second end of the switching tube is connected to the negative electrode of the diode and the first end of the inductor respectively. The second end of the inductor is connected to the first end of the output capacitor and the first end of the electrolysis device respectively. The second end of the input capacitor, the positive electrode of the diode, the second end of the output capacitor, and the second end of the electrolysis device are all connected to the negative electrode of the input voltage. The inductance value is determined by the following formula: Where L is the inductance, V i is the input voltage, V o is the output voltage, V d is the forward conduction voltage drop of the diode, f is the switching frequency of the switch tube, ΔI L is the inductor current ripple; The minimum input capacitance is determined by the following formula: Where C imin is the minimum input capacitance, I o is the current; The minimum output capacitance is determined by the following formula: Where C omin is the minimum value of output capacitance.

2. The method according to claim 1, characterized in that Also includes: When the generated power is greater than or equal to the minimum safe power, turning on the electrolysis device; When the generated power is less than the minimum safe power, the electrolysis device is shut down.

3. A regulating device for a converter of a hydrogen production system, characterized in that: A controller for a photovoltaic electrolysis hydrogen production system, wherein the photovoltaic electrolysis hydrogen production system includes a photovoltaic power generation device, a measuring device, a converter, and an electrolysis device, wherein the photovoltaic power generation device, the converter, and the electrolysis device are connected in sequence, the controller is connected to the measuring device and the converter, respectively, and the measuring device is connected to the photovoltaic power generation device, and the device includes: an acquisition unit configured to acquire parameters of the photovoltaic power generation device under the highest irradiance obtained by the measuring device; wherein the parameters under the highest irradiance include the maximum power generation power and the corresponding voltage under the highest irradiance; an adjusting unit configured to adjust target parameter values ​​of the converter based on the voltage and known electrolytic cell parameters; wherein the target parameter values ​​include an inductance value, a minimum input capacitance value, and a minimum output capacitance value; The electrolytic cell parameters include output voltage, current, diode forward voltage drop, switch tube switching frequency, inductor current ripple, maximum safe power and minimum safe power; The converter includes an input capacitor, a switching tube, a diode, an inductor, and an output capacitor. The first end of the input capacitor is connected to the positive electrode of the input voltage and the first end of the switching tube respectively. The second end of the switching tube is connected to the negative electrode of the diode and the first end of the inductor respectively. The second end of the inductor is connected to the first end of the output capacitor and the first end of the electrolysis device respectively. The second end of the input capacitor, the positive electrode of the diode, the second end of the output capacitor, and the second end of the electrolysis device are all connected to the negative electrode of the input voltage. The inductance value is determined by the following formula: Where L is the inductance, V i is the input voltage, V o is the output voltage, V d is the forward conduction voltage drop of the diode, f is the switching frequency of the switch tube, ΔI L is the inductor current ripple; The minimum input capacitance is determined by the following formula: Where C imin is the minimum input capacitance, I o is the current; The minimum output capacitance is determined by the following formula: Where C omin is the minimum value of output capacitance.

4. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method according to any one of claims 1 to 2 is implemented.

5. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed in a computer, the computer is caused to execute the method according to any one of claims 1 to 2.

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