Photovoltaic power generation direct electrolysis water and power grid power supply coupling cooperative control method

Abstract

The invention relates to a photovoltaic power generation direct electrolysis water and power grid power supply coupling cooperative control method. The method comprises two steps of system configuration and electrolysis operation. The system has the characteristics of high integration and high modularization, meets normal operation of electrolyzed water, effectively overcomes the defects existing in operation of a photovoltaic system, improves the utilization rate of photovoltaic energy, and effectively reduces the operation cost of electrolyzed water operation; and on the other hand, in the operation process, the stability and reliability of the power supply quality under the action of electrolyzed water are effectively improved, the interference and influence of voltage fluctuation and harmonic interference on electrolyzed water production operation are reduced, the control precision of the electrolyzed water operation is effectively improved, and therefore the purposes of improving the safety and reliability of the electrolyzed water operation and the stability of the yield are achieved.

Description

Technical Field

[0001] This invention pertains to power transmission and transformation technology, and particularly relates to a method for the coordinated control of direct water electrolysis by photovoltaic power generation and power grid power supply coupling. Background Technology

[0002] Electrolysis of water is an important method for hydrogen production. However, in actual water electrolysis production, a large amount of electrical energy is often consumed, resulting in high costs. Furthermore, interference noise, voltage fluctuations, and current fluctuations in the power supply system significantly impact the stability and safety of the process. While research is underway to utilize photovoltaic power generation for water electrolysis, the power output of photovoltaic systems is highly susceptible to natural factors, making it difficult to effectively meet the needs of continuous water electrolysis. Although current photovoltaic systems can be easily connected to AC power grids, converting the direct current (DC) from the photovoltaic system to AC, and then using voltage regulation and rectification to obtain DC to drive water electrolysis, leads to significant energy losses and makes the power supply system overly complex.

[0003] Therefore, in order to address the shortcomings in current practical work, it is necessary to develop a solar photovoltaic power generation device based on tea-solar complementary technology to meet the needs of practical work. Summary of the Invention

[0004] The purpose of this invention is to provide a solar photovoltaic power generation device and its usage method based on tea-photovoltaic complementarity. This invention effectively features high integration and modularity. While meeting the normal operation requirements of water electrolysis, it effectively overcomes the defects in photovoltaic system operation, improves the utilization rate of photovoltaic energy, and thus effectively reduces the operating cost of water electrolysis. On the other hand, during operation, it effectively improves the stability and reliability of power supply quality for water electrolysis, reduces the interference and impact of voltage fluctuations and harmonic interference on water electrolysis production, and effectively improves the control accuracy of water electrolysis, thereby improving the safety, reliability, and output stability of water electrolysis.

[0005] To achieve the above objectives, the present invention provides a solar photovoltaic power generation device based on tea-photovoltaic complementarity: A method for coordinated control of photovoltaic power generation for direct water electrolysis and power grid coupling includes the following steps: S1, System Configuration: First, construct a photovoltaic power station and at least one water electrolysis production line. Then, the photovoltaic power station is electrically connected to the AC power grid and the water electrolysis production line respectively through an inverter coupling system. S2, Electrolysis Operation: After completing step S1, the voltage, current, and total power of the electrolyzed water production line are first set. The power generation and voltage fluctuation rate of the photovoltaic power station are detected through the inverter coupling system, while the supply voltage, voltage fluctuation rate, and harmonics of the AC power grid are also detected. Then, the inverter coupling system adjusts and rectifies the voltage of the photovoltaic power station according to its voltage regulation, and adjusts and rectifies the AC power supply to compensate for the insufficient power of the photovoltaic power station according to the energy consumption requirements of the electrolyzed water production line. Subsequently, the DC power from the photovoltaic power station after inverter rectification and the DC power from the AC power grid after rectification are combined, and the final output voltage and current values ​​are set to meet the requirements of the electrolyzed water production line before outputting to drive the actual electrolysis of water.

[0006] Furthermore, in step S2, during the setup, a logical connection function between the voltage and current values ​​for water electrolysis is established based on the temperature, ion concentration, and type of the water to be electrolyzed, and the optimal operating voltage and current values ​​are set.

[0007] Furthermore, in step S2, when the electricity generated by the photovoltaic power station exceeds the production requirements of the water electrolysis production line, the electricity generated by the photovoltaic power station is stored in reserve through an energy storage system. When the electricity supply from the photovoltaic power station to the water electrolysis production line is insufficient, the stored electricity is used to drive the operation of the water electrolysis production line.

[0008] Furthermore, the inverter coupling system includes a prefabricated substation, a support bracket, a ring main unit, a rectifier cabinet, a control cabinet, a rectifier circuit, an inverter circuit, a filter circuit, a switching circuit, a control circuit, an operating interface, and a drive circuit. The support bracket covers the prefabricated substation and is connected to the ring main unit, the rectifier cabinet, and the control cabinet respectively. The rectifier circuit, the inverter circuit, and the filter circuit are all located inside the rectifier cabinet, and the control circuit and the drive circuit are all located inside the control cabinet. The input and output terminals of the inverter circuit are electrically connected to at least one rectifier circuit, and the inverter circuit and the rectifier circuit connected to it form a rectifier group. There are at least two rectifier groups, and the rectifier groups are interconnected through switching circuits. Meanwhile, the rectifier circuit at the input end of the inverter circuit is electrically connected to the prefabricated substation via a switching circuit. The prefabricated substation is electrically connected to the photovoltaic power station and the AC power grid, and the photovoltaic power station and the AC power grid are each electrically connected to at least one prefabricated substation. The rectifier circuit at the output end of the inverter circuit is electrically connected to the ring main unit via a switching circuit. The ring main unit is also electrically connected to the AC power grid and the water electrolysis production line. The AC power grid, the prefabricated substation, and the ring main unit are all electrically connected via a filter circuit. The control circuit and the drive circuit are electrically connected to each other and are also electrically connected to the prefabricated substation, the ring main unit, and the control interface, which is embedded on the outer side of the control cabinet.

[0009] Furthermore, the control circuit is a circuit system with an industrial computer as the core, and a data storage circuit is provided; the drive circuit is a circuit system based on a programmable controller, and a MOS drive bus is additionally provided; the operation interface includes, but is not limited to, any one or several combinations of a display, a keyboard, buttons, knobs, and potentiometers.

[0010] Furthermore, the box-type substation is either a buried type or a semi-buried type.

[0011] Furthermore, the bearing bracket includes a bearing cross beam, bearing guide rails, connecting cross arms, adjusting screws, sliders, and adjusting bolts. The bearing cross beam is a strip structure with a rectangular cross-section of the cross arm surface. There are at least two and they are distributed in parallel. Several connecting cross arms are used to connect between adjacent bearing cross beams. The connecting cross arms and the connecting beam are vertically distributed. The two ends of the connecting cross arms are respectively connected to the bearing cross beam through two adjusting screws. The rear end surface of the adjusting screw is hinged to the end surface of the connecting cross arm through an elastic hinge, and the front end surface is connected to the bearing cross beam and the bearing guide rail through a slider. At least one adjusting bolt is provided on the upper end surface of the slider, and the adjusting bolt is vertically distributed with the upper end surface of the slider.

[0012] Furthermore, the slider is a groove structure with a "C"-shaped cross-section. Its groove body wraps around the bearing cross beam and the bearing guide rails and is slidably connected to the bearing cross beam and the bearing guide rails. At the same time, the slider and the bearing guide rail are additionally connected through a positioning bolt. [[ID=I2]]

[0013] Furthermore, the bearing guide rail is either of an "L"-shaped or "H"-shaped cross-section.

[0014] The present invention effectively has the characteristics of high integration and modularization. While meeting the normal operation of electrolyzed water, on the one hand, it effectively overcomes the defects existing in the operation of the photovoltaic system, improves the utilization rate of photovoltaic energy, and thus effectively reduces the operation cost of electrolyzed water operation; on the other hand, during operation, it effectively improves the stability and reliability of the power supply quality of electrolyzed water, reduces the interference and influence of voltage fluctuations and harmonic interference on the electrolyzed water production operation, and effectively improves the control accuracy of electrolyzed water operation, so as to achieve the improvement of the safety, reliability, and production stability of electrolyzed water operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] <s Figure 1 It is a schematic structural diagram of the system of the present invention; Figure 2 It is a schematic structural diagram of the bearing bracket; Figure 3 It is a schematic flowchart of the method of the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1 to 3 As shown, a method for coordinated control of photovoltaic power generation for direct water electrolysis and power grid coupling includes the following steps: S1, System Configuration: First, construct a photovoltaic power station and at least one water electrolysis production line. Then, the photovoltaic power station is electrically connected to the AC power grid and the water electrolysis production line respectively through an inverter coupling system. S2, Electrolysis Operation: After completing step S1, the voltage, current, and total power of the electrolyzed water production line are first set. The power generation and voltage fluctuation rate of the photovoltaic power station are detected through the inverter coupling system, while the supply voltage, voltage fluctuation rate, and harmonics of the AC power grid are also detected. Then, the inverter coupling system adjusts and rectifies the voltage of the photovoltaic power station according to its voltage regulation, and adjusts and rectifies the AC power supply to compensate for the insufficient power of the photovoltaic power station according to the energy consumption requirements of the electrolyzed water production line. Subsequently, the DC power from the photovoltaic power station after inverter rectification and the DC power from the AC power grid after rectification are combined, and the final output voltage and current values ​​are set to meet the requirements of the electrolyzed water production line before outputting to drive the actual electrolysis of water.

[0018] In this embodiment, during step S2, a logical connection function between the voltage and current values ​​for water electrolysis is established based on the temperature, ion concentration, and type of the water to be electrolyzed, and the optimal operating voltage and current values ​​are set.

[0019] Meanwhile, in step S2, when the electricity generated by the photovoltaic power station exceeds the production needs of the water electrolysis production line, the electricity generated by the photovoltaic power station is stored in reserve through the energy storage system. When the electricity supply from the photovoltaic power station to the water electrolysis production line is insufficient, the stored electricity is used to drive the operation of the water electrolysis production line.

[0020] As specifically noted, the inverter coupling system includes a prefabricated substation 1, a support bracket 2, a ring main unit 3, a rectifier cabinet 4, a control cabinet 5, a rectifier circuit 6, an inverter circuit 7, a filter circuit 8, a switching circuit 9, a control circuit 10, an operating interface 11, and a drive circuit 12. The support bracket 2 covers the prefabricated substation 1 and is connected to the ring main unit 3, the rectifier cabinet 4, and the control cabinet 5 respectively. The rectifier circuit 6, the inverter circuit 7, and the filter circuit 8 are all located inside the rectifier cabinet 4, and the control circuit 10 and the drive circuit 11 are both located inside the control cabinet 5. The input and output terminals of the inverter circuit 7 are electrically connected to at least one rectifier circuit 6, and the inverter circuit 7 and the rectifier circuit 7 connected to it form a rectifier group. There are at least two rectifier groups, and the rectifier groups are interconnected through the switching circuit 9. The rectifier circuit 6 at the input of the inverter circuit 7 is electrically connected to the box-type substation 1 via the switch circuit 9. The box-type substation 1 is electrically connected to the photovoltaic power station 13 and the AC power grid 14, and the photovoltaic power station 13 and the AC power grid 14 are each electrically connected to at least one box-type substation 1. The rectifier circuit 6 at the output of the inverter circuit 7 is electrically connected to the ring main unit 3 via the switch circuit 9. The ring main unit 3 is also electrically connected to the AC power grid 14 and the water electrolysis production line 15. Meanwhile, the AC power grid 14 is electrically connected to the box-type substation 1 and the ring main unit 3 via the filter circuit 8. The control circuit 10 and the drive circuit 12 are electrically connected to each other and to the box-type substation 1, the ring main unit 3, and the control interface 11, respectively. The control interface 11 is embedded on the outer side of the control cabinet 5.

[0021] In this embodiment, the control circuit 10 is a circuit system based on an industrial computer and includes a data storage circuit; the drive circuit 12 is a circuit system based on a programmable controller and also includes a MOS drive bus; the control interface 11 includes, but is not limited to, any one or more of the following: display, keyboard, buttons, knobs, and potentiometers.

[0022] Further optimization is that the box-type substation 1 can be either underground or semi-underground.

[0023] Meanwhile, the carrying bracket 2 includes a carrying crossbeam 21, a carrying guide rail 22, a connecting cross arm 23, an adjusting screw 24, a slider 25, and an adjusting bolt 26. The carrying crossbeam 21 is a strip structure with a rectangular cross-sectional surface of the cross arm, and at least two are distributed in parallel with each other. A number of connecting cross arms 23 are used to connect between adjacent carrying crossbeams 21. The connecting cross arm 23 is vertically distributed with the connecting crossbeam 21, and its two ends are respectively connected to the carrying crossbeam 21 through two adjusting screws 24. The rear end surface of the adjusting screw 24 is hinged to the end surface of the connecting cross arm 23 through an elastic hinge, and the front end surface is connected to the carrying crossbeam 21 and the carrying guide rail 22 through the slider 25. At least one adjusting bolt 26 is provided on the upper end surface of the slider 25, and the adjusting bolt 26 is vertically distributed with the upper end surface of the slider 25.

[0024] In this embodiment, the slider 25 is a groove-shaped structure with a "C" - shaped cross-section. Its groove body covers the outside of the carrying crossbeam 21 and the carrying guide rail 22 and is slidably connected to the carrying crossbeam 21 and the carrying guide rail 22. At the same time, the slider 25 and the carrying guide rail 22 are connected by a positioning bolt.

[0025] In this embodiment, the carrying guide rail 22 is any one of an "L" - shaped or "H" - shaped cross-section.

[0026] In use, the structural strength of the carrying crossbeam and the carrying guide rail can effectively connect and carry - position the box - type substation, ring - main unit, rectifier cabinet, and control cabinet. At the same time, the set connecting cross arm further improves the carrying strength and structural stability. At the same time, the set adjusting screw and elastic hinge can adjust the distance and relative angle between the carrying crossbeam and the carrying guide rail. At the same time, the set slider adjusts the connection position and positioning height of the substation, ring - main unit, rectifier cabinet, and control cabinet through the adjusting bolt.

[0027] The present invention effectively has the characteristics of high integration and modularization. While meeting the normal operation of electrolyzed water, on the one hand, it effectively overcomes the defects existing in the operation of the photovoltaic system, improves the utilization rate of photovoltaic energy, and thus effectively reduces the operation cost of electrolyzed water operation; on the other hand, during operation, it effectively improves the stability and reliability of the power supply quality of electrolyzed water, reduces the interference and influence of voltage fluctuations and harmonic interference on electrolyzed water production operation, and effectively improves the control accuracy of electrolyzed water operation, so as to achieve improving the safety, reliability, and production stability of electrolyzed water operation.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] In the description of this specification, the terms "connection", "installation", "fixing", "setting", etc. are interpreted broadly. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect. It can also be an integral connection or a partial connection. In such cases, those skilled in the art can understand the specific meaning of the above terms in this invention or invention according to the specific circumstances.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for coupling and cooperative control of photovoltaic power generation, direct electrolysis of water and power supply of power grid, characterized in that, The method for using the tea light complementary based solar photovoltaic power generation device comprises the following steps: S1, system configuration, first build photovoltaic power station, and at least one electrolytic water production line, then the photovoltaic power station is coupled with the alternating current power grid and the electrolytic water production line through the inverter system respectively; S2, electrolysis operation, after completing the step S1, first set the voltage value and the current value and the total power of the electrolytic water production line during the electrolysis operation, detect the power generation, voltage fluctuation rate of the photovoltaic power station through the inverter system, and detect the power supply voltage, voltage fluctuation rate, and harmonic of the alternating current power grid; then, according to the voltage regulation and rectification of the photovoltaic power station, and according to the energy consumption requirement of the electrolytic water production line operation, the insufficient power of the photovoltaic power station is supplemented by the voltage regulation and rectification of the alternating current power supply, so as to obtain the complementary power to make up for the insufficient power of the photovoltaic power station, and then the rectified photovoltaic power station and the rectified alternating current power grid are connected in parallel, and the final output voltage and current value reach the operating voltage and current value of the electrolytic water production line, and then the electrolytic water production operation is driven.

2. The method of claim 1, wherein the method is characterized by, In the step S2, the logical function between the voltage and the current value for electrolytic water is established based on the temperature, ion concentration, and example type of the electrolytic water, and the optimal working voltage value and the optimal current value are set.

3. The method of claim 1, wherein the method further comprises: In the step S2, when the power generated by the photovoltaic power station is greater than the power required by the electrolytic water production line, the power generated by the photovoltaic power station is stored in the energy storage system for standby, and when the power supplied by the photovoltaic power station to the electrolytic water production line is insufficient, the stored power is used to drive the electrolytic water production line.

4. The method of claim 1, wherein the method further comprises: The inverter coupling system comprises a box-type substation, a bearing bracket, a ring network cabinet, a rectifier cabinet, a control cabinet, a rectifier circuit, an inverter circuit, a filter circuit, a switching circuit, a control circuit, an operation interface, and a driving circuit. The bearing bracket is wrapped outside the box-type substation and is connected with the ring network cabinet, the rectifier cabinet, and the control cabinet respectively. The rectifier circuit, the inverter circuit, and the filter circuit are located in the rectifier cabinet. The control circuit and the driving circuit are located in the control cabinet. The input end and the output end of the inverter circuit are electrically connected with at least one rectifier circuit, and the inverter circuit and the connected rectifier circuit form a rectifier group. There are at least two rectifier groups, and the rectifier groups are connected in parallel through the switching circuit. The rectifier circuit of the input end of the inverter circuit is electrically connected with the box-type substation through the switching circuit. The box-type substation is electrically connected with the photovoltaic power station and the alternating current power grid respectively, and the photovoltaic power station and the alternating current power grid are electrically connected with at least one box-type substation respectively. The rectifier circuit of the output end of the inverter circuit is electrically connected with the ring network cabinet through the switching circuit. The ring network cabinet is electrically connected with the alternating current power grid and the electrolytic water production line respectively. The alternating current power grid and the box-type substation are electrically connected with the ring network cabinet through the filter circuit. The control circuit and the driving circuit are electrically connected and are electrically connected with the box-type substation, the ring network cabinet, and the operation interface respectively. The operation interface is embedded on the outer side of the control cabinet.

5. The method of claim 4, wherein the method further comprises: The control circuit is a circuit system with an industrial computer as a core, and is provided with a data storage circuit; the driving circuit is a circuit system based on a programmable controller, and is further provided with a MOS driving bus; the operation interface includes, but is not limited to, any one or several of a display, a keyboard, a button, a knob, and a potentiometer.

6. The method of claim 4, wherein the method further comprises: The box-type substation is any one of a buried type and a semi-buried type.

7. The method of claim 4, wherein the method further comprises: The bearing bracket includes a bearing beam, a bearing guide rail, a connecting cross arm, an adjusting screw, a sliding block, and an adjusting bolt, wherein the bearing beam is a strip structure with a rectangular cross arm face, at least two of which are distributed in parallel, and adjacent two bearing beams are connected with each other through a plurality of connecting cross arms, the connecting cross arm is distributed perpendicularly between the connecting cross arm and the connecting beam, and both ends of the connecting cross arm are connected with the bearing beam through two adjusting screws, respectively, the rear end face of the adjusting screw is hinged to the end face of the connecting cross arm through an elastic hinge, the front end face is connected with the bearing beam and the bearing guide rail through a sliding block, at least one adjusting bolt is additionally arranged on the upper end face of the sliding block, and the adjusting bolt is distributed perpendicularly to the upper end face of the sliding block.

8. The method of claim 7, wherein the method further comprises: The sliding block is a "Fang" character-shaped groove structure in cross section, the groove body of which is covered outside the bearing beam and the bearing guide rail and is connected with the bearing beam and the bearing guide rail in sliding mode, and the sliding block and the bearing guide rail are further connected through a positioning bolt.

9. The method of claim 7, wherein the method further comprises: The bearing guide rail is any one of an "L" type and an "H" type in cross section.

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