KR101816839B1 - Complex power circuit for renewable energy directly connected hydrogen generating device and control method thereof - Google Patents

Abstract

Disclosed are a composite power circuit for a hydrogen generator directly connected to renewable energy, and a controlling method thereof. The composite power circuit comprises: a direct current (DC)-alternating current (AC) converter which converts direct currents applied from a renewable energy source into a preset alternating current voltage; a distribution unit which distributes the AC voltage converted in the DC-AC converter to a power applied to a water electrolyzer and to a power applied to an AC power supplying system, a power system; a converting rectifying unit which receives AC voltage corresponding to the power applied to the water electrolyzer, and converts the same into DC voltage which can be used in the water electrolyzer; and a control unit which analyzes a maximum hydrogen generating voltage by which the water electrolyzer can generate hydrogen at the maximum efficiency rate, a power corresponding to the analyzed maximum hydrogen generating voltage and a requirement power of the AC power supplying system, determines powers respectively provided to the water electrolyzer and the AC power supplying system, and controls the distribution unit according to the determination result. The purpose of the present invention is to provide a composite power circuit for a hydrogen generator directly connected to renewable energy which can use energy generated from renewable energy sources at the maximum efficiency rate.

Description

TECHNICAL FIELD [0001] The present invention relates to a hybrid power circuit for a direct-coupled hydrogen generator, and a control method thereof. BACKGROUND OF THE INVENTION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid power circuit and a control method thereof, and more particularly, to a hybrid power circuit and a control method thereof for a hydrogen generator directly connected to renewable energy.

Excessive use of fossil fuels has led to serious environmental problems such as global warming and the depletion of fossil resources. To solve these problems, various alternative energy sources and technologies to utilize them have been developed. In particular, the development and commercialization of renewable energy technologies such as solar power and wind power generation have been rapidly progressing. The biggest problem of these renewable energy sources is that energy is generated irregularly and it is difficult to use it as a stable power source. In order to overcome this, recently, it is a trend to add an energy storage device to a new and renewable energy generation source, to store the generated energy, and to stabilize the stored energy to be supplied to the load. As one of the energy storage methods, there is a method of producing hydrogen by using the energy obtained from a renewable energy source in association with a water electrolyzer, storing and selling the produced hydrogen, or using it as a fuel cell together with the fuel cell do. In particular, hydrogen is one of the fuels that can be supplied to fuel cells. It is attracting attention as a next-generation energy carrier to replace fossil fuels such as petroleum and coal. It does not generate greenhouse gases when burned, It is evaluated as an energy source. In addition, since hydrogen can be easily stored, it is possible to secure sufficient storage capacity to cope with irregular generation characteristics of renewable energy and long-term relief / no-wind days, and to provide balanced supply of electric power and thermal energy. Which is a fuel source.

If the characteristics of the electrolytic cell are simulated as an electric load, the amount of hydrogen generated increases proportional to the current, so that it can be simply interpreted as a resistance. That is, the hydrogen generation amount can be adjusted by varying the input current or voltage. Therefore, a device capable of efficiently connecting a water electrolytic cell with a new and renewable energy source is required to maximize hydrogen generation from renewable energy.

Korean Registered Patent No. 10-0754909 (registered on Aug. 28, 2007)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hybrid power circuit for a renewable energy direct connection type hydrogen generator which makes it possible to utilize energy generated from a renewable energy source with maximum efficiency.

Another object of the present invention is to provide a method for controlling a hybrid power circuit for a hydrogen generator directly connected to renewable energy to achieve the above object.

According to another aspect of the present invention, there is provided a hybrid power circuit for a hydrogen generator directly connected to a renewable energy, comprising: a DC-AC converter for converting DC power applied from a renewable energy source into a predetermined AC voltage; A distributor for distributing the AC voltage converted by the DC / AC converter to power applied to a water electrolytic bath and power applied to an AC power supply system, which is a power system; A conversion rectifying unit that receives the AC voltage corresponding to the electric power applied to the water electrolyzer and converts the AC voltage into a DC voltage usable in the water electrolyzer; And analyzing the maximum hydrogen generation voltage at which the water electrolyzer can generate hydrogen with maximum efficiency and analyzing the power corresponding to the analyzed maximum hydrogen generation voltage and the required electric power of the AC power supply system, A controller for discriminating power to be supplied to the AC power supply system and controlling the distributor according to a result of the discrimination; .

The control unit communicates with the AC power supply system to control the distribution unit so that all of the AC voltage converted from the DC / AC converter is applied to the conversion / rectification unit when it is determined that the AC power supply system does not require power. And a power corresponding to the maximum hydrogen generation voltage is applied to the conversion rectification unit and the rest of the power is supplied to the AC power supply system when it is determined that the AC power supply system requires power .

At least one transformer for adjusting the voltage level of the AC voltage to a predetermined voltage level; And at least one rectifier for rectifying the AC voltage whose voltage level is adjusted in each of the at least one transformer and converting the rectified AC voltage into a DC voltage usable in the water electrolyzer; And a control unit.

The DC-AC converter converts the DC power into a three-phase commercial AC voltage usable directly in the AC power supply system.

Wherein the at least one transformer is a plurality of transformers having different wiring schemes.

According to an aspect of the present invention, there is provided a method of controlling a hybrid power circuit for a hydrogen generator directly connected to a renewable energy, the method comprising: Converting the DC power applied from the renewable energy source to a predetermined AC voltage; Analyzing the maximum hydrogen generation voltage at which the combined electrolytic cell can generate hydrogen with maximum efficiency; The composite power circuit communicating with an AC power supply system that is a power system to determine whether the AC power supply system requires power; If the AC power supply system determines that the AC power supply system requires power, analyzes the power corresponding to the analyzed maximum hydrogen generation voltage and the required power of the AC power supply system analyzed by the hybrid power circuit, Discriminating and distributing power to be supplied to each of the supply systems; And converting the AC voltage corresponding to the power applied to the water electrolytic bath to a DC voltage usable in the water electrolytic bath, .

Wherein the distributing step comprises the steps of: distributing the mixed power circuit such that power corresponding to the maximum hydrogen generating voltage is applied to the water electrolyzer when it is determined that the AC power supply system requires electric power; And distributing the remaining electric power to the AC power supply system except the electric power applied to the water electrolysis vessel; And a control unit.

The method of controlling the hybrid power circuit includes the steps of applying all of the AC voltage converted by the DC / AC converter to the conversion rectification unit when it is determined that the AC power supply system does not require power; And further comprising:

Wherein the step of converting the voltage into the DC voltage comprises: adjusting a voltage level of the AC voltage to a predetermined voltage level; And rectifying the AC voltage whose voltage level is adjusted and converting the AC voltage into a usable DC voltage in the water electrolyzer; And a control unit.

Therefore, the hybrid power circuit and its control method for a hydrogen generator directly connected to renewable energy of the present invention can convert power generated from a renewable energy source into alternating-current power, control the alternating-current power, It is possible to more effectively control the electric power supplied to the water electrolytic bath. In addition, the power generated from the renewable energy source can be directly transmitted to the AC power supply system, thereby preventing the efficiency degradation that may occur in the hydrogen conversion process. In addition, when the AC power supply system does not require electric power, it is reconverted to DC power higher than the maximum hydrogen generation voltage to increase the hydrogen production amount of the water electrolytic cell, so that the power generated from the renewable energy source is maximized So that it can be utilized. In other words, it is possible to apply not only the power supply of water electrolytic cell but also the grid-connected operation, so that it can be applied to various loads and it is easy to expand to a large capacity system.

1 shows a renewable energy supply system according to an embodiment of the present invention.
Fig. 2 shows a detailed configuration of the composite power circuit of Fig.
FIG. 3 shows a hybrid power circuit control method for a hydrogen generator directly connected to renewable energy according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in various different forms, and is not limited to the embodiments described. In order to clearly describe the present invention, parts that are not related to the description are omitted, and the same reference numerals in the drawings denote the same members.

Throughout the specification, when an element is referred to as "including" an element, it does not exclude other elements unless specifically stated to the contrary. The terms "part", "unit", "module", "block", and the like described in the specification mean units for processing at least one function or operation, And a combination of software.

1 shows a renewable energy supply system according to an embodiment of the present invention.

1, the renewable energy production and supply system of the present invention includes a renewable energy source 100, a hydrogen generation and storage device 200 and a renewable energy source 100 such as a solar power and a wind power generation system, And a hybrid power circuit (CPCS) disposed between the hydrogen production storage device (200). The renewable energy production and supply system receives hydrogen from the AC power supply system (ACPS), which is an electric power system directly receiving the AC power from the complex power circuit (CPCS), and the hydrogen generation storage device 200, (HFC) that produces hydrogen.

In FIG. 1, a hydrogen supply device (HSD) is a device that receives hydrogen from a hydrogen generating and storing device (200), directly supplies power using hydrogen, and supplies hydrogen to various devices performing predetermined operations, A commercial power load (ELD) is a power consuming device that receives AC or DC power from an AC power supply system (ACPS) or a hydrogen fuel cell (HFC) to perform a specified operation.

In FIG. 1, the renewable energy source 100 may use not only the above-described solar and wind power generation systems, but also geothermal, biomass, hydroelectric energy, and the like. However, since the renewable energy that is currently being actively studied in Korea and available as a commercial energy source is solar energy and wind energy, FIG. 1 shows solar and wind energy as an example.

On the other hand, the renewable energy source (100) is configured to acquire energy from the natural environment in the form of electric power, and a large difference occurs in the amount of electric power production according to the change of the environment. In some cases, do. That is, power generation is irregular and prediction is also very difficult. If the generated power is irregular, it is not possible to stably supply the required power at the lower stage as described above, but may have an unnecessary adverse effect on the load depending on the fluctuation range of the power. The power produced by the renewable energy source 100 can not be directly supplied to the power load.

Accordingly, the present invention includes a complex power circuit (CPCS) for converting the power generated by the renewable energy source 100 into power suitable for the load and stably supplying the power. In the present invention, the hybrid power circuit (CPCS) first analyzes the power and the amount of power that the hydrogen generating and storing device 200 can produce and store hydrogen at the maximum efficiency, And supplies the converted power to the hydrogen generating and storing device 200. [ The combined power circuit (CPCS) first analyzes the electric power and the amount of power that the water electrolyzer (WEZ) of the hydrogen generating and storing device 200 relative to the power generated by the renewable energy source 100 can produce hydrogen with the maximum efficiency do.

The water electrolysis cell (WEZ) generates hydrogen and oxygen by electrolyzing water when electric power is applied, and it is possible to generate hydrogen with a high energy conversion efficiency of up to 90% in the case of a solid polymer electrolytic cell in a water electrolysis cell. The water electrolysis bath (WEZ) can simulate an electric load exhibiting a characteristic in which the amount of generated hydrogen increases proportionally to the input electric current, and thus exhibits electrical characteristics similar to those of the resistance element. That is, by varying the voltage applied to the water electrolysis bath WEZ, the amount of hydrogen generated in the water electrolysis bath WEZ can be adjusted. In the present invention, since the voltage applied to the water electrolyzer (WEZ) is one of the outputs of the complex power circuit (CPCS), the complex power circuit (CPCS) is controlled by the maximum power point tracking (MPPT) The power generation efficiency of the new and renewable energy source 100 and the hydrogen generation efficiency of the water electrolysis tank (WEZ) are all converted into the power for satisfying both of the hydrogen generation efficiency and the maximum hydrogen generation voltage. For example, when the renewable energy source 100 generates and transmits power at a voltage level capable of producing the maximum power according to the maximum output follow-up control scheme, the complex power circuit CPCS transmits the applied power to the water electrolyzer (WEZ) To the maximum hydrogen generation voltage capable of maximizing the hydrogen generation efficiency of the hydrogen generator. In particular, in the present invention, the composite power circuit (CPCS) is configured to convert the DC power applied from the renewable energy source 100 into AC power, convert the converted AC power into DC power, and supply the converted DC power to the water electrolyzer (WEZ) do. In particular, the combined power circuit (CPCS) converts DC power applied from the renewable energy source 100 into commercial AC power used in the AC Power Supply System (ACPS).

This is for the purpose of enabling the hybrid power circuit (CPCS) of the present invention not only to supply power for generating hydrogen but also to operate as a grid-connected power supply for an AC power supply system (ACPS). As described above, the power generated in most of the renewable energy sources 100 is currently DC, while the power system currently used for commercial purposes is based on AC. Therefore, the power generated by the renewable energy source 100 can not be immediately supplied to the used power system.

Therefore, the complex power circuit (CPCS) first converts the DC power generated by the renewable energy source 100 into AC power that can be directly supplied to the AC power supply system (ACPS) of the power system. Then, the maximum hydrogen generation voltage to be supplied to the water electrolysis tank (WEZ) is first generated from the converted AC power. As described above, since the maximum hydrogen generation voltage is DC, the composite power circuit (CPCS) converts the converted AC power back to DC power and supplies it.

The combined power circuit (CPCS) may supply the AC power to the ACPS other than the power converted back to DC power to supply the converted AC power to the water electrolyzer (WEZ). At this time, the complex power circuit (CPCS) has already converted the power generated by the renewable energy source 100 into the AC power usable in the AC power supply system (ACPS), so that the AC power can be supplied immediately without any additional processing . That is, in order to maximize the efficiency of power utilization, the complex power circuit (CPCS) of the present invention first generates the maximum hydrogen generation voltage that allows the water electrolysis tank (WEZ) to generate hydrogen with the maximum efficiency, Power supply system (ACPS).

In this case, the combined power circuit (CPCS) does not supply electric power to the AC power supply system (ACPS), and the voltage exceeding the maximum hydrogen generation voltage Can be generated. The AC power supply system (ACPS), which is a conventional power system, basically includes a separate power generation means except for the renewable energy source 100, and is configured to supply the generated power using the power generation means. However, power demand may fluctuate from time to time, and it may happen that the power generation means of AC Power Supply System (ACPS) can not cope with fluctuating power demand, and a new and renewable energy source 100 ), It is preferable to use a renewable energy source 100 as much as possible. However, as described above, in the renewable energy source 100, electric power is irregularly produced, and the existing electric power generating means is a structure that is difficult to immediately change the electric power production amount in real time. Therefore, it is very frequent that existing power generation means produce electric power at a level that can sufficiently supply the total electric power demand. There is no need for the combined power circuit (CPCS) to supply power to the ACPS when the existing power producing means produces power at a level sufficient to provide the full power demand. This is because power is a form of energy with poor storage efficiency.

If no additional power is required in the AC Power Supply System (ACPS), the combined power circuit (CPCS) will convert the converted AC power beyond the maximum hydrogen generation voltage at which the water electrolyzer (WEZ) can produce hydrogen with maximum efficiency DC voltage, and can be supplied to the water electrolysis bath (WEZ). This is because further production of hydrogen from the power already produced by the renewable energy source 100 is more effective in terms of utilization, even if the efficiency of generating hydrogen in the water electrolysis tank (WEZ) is lowered.

The hydrogen generating and storing device 200 includes a water electrolysis bath (WEZ) and a hydrogen storage tank (HTK). The water electrolysis cell (WEZ) generates hydrogen and oxygen by electrolyzing water according to the voltage applied in the complex power circuit (CPCS). The generated hydrogen is stored in a hydrogen storage tank (HTK), and oxygen is treated separately. Generally, the generated oxygen can also be used for various purposes, but it is not related to the power generation, so the present invention does not specifically mention the method of post-treatment of the generated oxygen.

Meanwhile, the hydrogen stored in the hydrogen tank (HTK) may be supplied to a hydrogen fuel cell (HFC) or may be provided to a hydrogen supply device (HSD) supplying hydrogen. Hydrogen fuel cells (HFCs) are devices that produce electricity using hydrogen. They produce electricity by reacting hydrogen and oxygen using the reverse reaction of a water electrolyzer (WEZ) that decomposes water into hydrogen and oxygen by electrolysis. The hydrogen supply device (HSD) supplies hydrogen to various hydrogen loads (not shown), such as a hydrogen vehicle, which is supplied with hydrogen and generates electric power directly from hydrogen.

As a result, in the present invention, the complex power circuit (CPCS) first converts the power generated in the renewable energy source 100 into commercial AC power that can be used immediately in the AC power supply system (ACPS) The power for generating the maximum hydrogen generation voltage to be supplied to the power supply WEZ is preferentially re-converted to the DC power. After analyzing the power demanded by the ACPS, if the AC power supply system requires power, it converts the converted commercial AC power directly to the AC power supply system (ACPS) , Thereby preventing a decrease in efficiency that may occur in the hydrogen conversion process. Further, when the AC power supply system (ACPS) does not require electric power, it is re-converted to DC power equal to or higher than the maximum hydrogen generation voltage to increase the hydrogen production amount of the water electrolysis tank (WEZ) So that it can be utilized at maximum efficiency according to the situation.

In other words, it can be applied to various loads because it is possible to operate not only power supply but also grid-connected operation, and it is easy to expand to a large-capacity system.

Fig. 2 shows a detailed configuration of the composite power circuit of Fig.

Referring to FIG. 2, the complex power circuit (CPCS) includes a DC-AC converter (CONV), a distribution unit (DIV), a conversion rectification unit (CRCF), and a control unit CON.

The DC-AC converter (CONV) receives the direct current power (Ppv) from the renewable energy source (100) and converts it into an alternating voltage (Vinv) having a predetermined voltage and transfers it to the distributor (DIV). At this time, the AC voltage (Vinv) may be a three-phase AC voltage.

The control unit CON performs the maximum output follow-up control (MPPT) and the maximum hydrogen generation voltage analysis of the renewable energy to determine both the power production efficiency of the renewable energy source 100 and the hydrogen generation efficiency of the water electrolysis tank (WEZ) Calculate the maximum hydrogen generation voltage that can maximize the hydrogen generation efficiency of the water electrolysis tank (WEZ). And analyzes power to be transferred to the CRCF among the powers applied from the renewable energy source 100 to generate the calculated maximum hydrogen generation voltage.

Further, the control unit CON receives and analyzes the power demand from the AC power supply system (ACPS). To this end, the control unit CON can communicate with the AC power supply system (ACPS). The control unit CON controls the distribution unit DIV in response to the electric power to be transmitted to the analyzed conversion rectification unit CRCF and the electric power demand amount of the AC power supply system ACPS, And adjusts the amount of power to be applied to the system (ACPS).

The distribution unit DIV transfers the AC voltage applied from the DC-AC converter CONV to at least one of the conversion rectification unit CRCF and the AC power supply system ACPS under the control of the control unit CON. At this time, the distribution unit DIV can be controlled so that the power applied by the control unit CON is distributed and transmitted. As shown in FIG. 2, the distribution unit DIV may be implemented by two switches SW1 and SW2. In some cases, a power divider may be provided to distribute power.

The conversion rectification section (CRCF) converts and rectifies the AC voltage applied from the distribution section DIV to a usable voltage level in the water treatment tank WEZ and converts it to the DC voltage Vhydro again. In the present invention, as shown in FIG. 2, the conversion rectification unit (CRCF) includes two or more transformers (TF1 and TF2) and transformers (TF1 and TF2) having different wiring schemes, such as Δ-Y wiring and Δ- It is possible to generate a stable high-quality direct-current voltage Vhydro by crossing each phase of the alternating-current voltage Vinv, which is a three-phase alternating current, using the rectifiers RCF1 and RCF2 for rectifying the output.

On the other hand, in FIG. 2, in the case where the AC voltage Vinv converted from the DC-AC converter CONV is not output to the commercial AC power which can be directly used in the AC power supply system ACPS, the third transformer TF3, If the DC-to-AC converter (CONV) outputs the AC voltage (Vinv) to the commercial AC power available directly in the AC power supply system (ACPS), it can be omitted.

FIG. 3 shows a hybrid power circuit control method for a hydrogen generator directly connected to renewable energy according to an embodiment of the present invention.

3, the DC-AC converter (CONV) of the combined power circuit (CPCS) receives the DC power from the renewable energy source 100 first , And converts it into a preset AC voltage (S10). The converted AC voltage may be a commercial three-phase AC voltage used in an AC power supply system (ACPS).

In order to generate the maximum hydrogen generation voltage capable of maximizing the hydrogen generation efficiency of the water electrolysis unit WEZ, the control unit CON controls the electric power to be transferred to the conversion rectification unit (CRCF) among the electric power applied from the renewable energy source 100 (S20).

Also, the control unit CON communicates with the AC power supply system (ACPS) to determine whether the AC power supply system ACPS requests power (S30). If it is determined that the AC power supply system (ACPS) requires power, the control unit CON responds to the power to be delivered to the analyzed conversion rectifier (CRCF) and the power demand of the AC power supply system (ACPS) (DIV) to adjust and distribute the amount of power to be applied to the conversion rectification unit (CRCF) and the AC power supply system (ACPS) (S40). The power to be applied to the power supply system (ACPS) among the distributed power is converted into the commercial AC power already in the DC-AC converter (CONV), and is immediately transmitted to the power supply system (ACPS). However, if it is determined that the AC power supply system (ACPS) does not require power, the control unit CON transfers all the power output from the DC-AC converter (CONV) to the conversion rectification unit (CRCF).

On the other hand, the conversion rectification unit (CRCF) re-converts the transmitted electric power into a DC voltage of a form suitable for use in the water electrolysis bath (WEZ) (S50). Then, the re-converted power is transmitted to the water tank (WEZ) so that hydrogen can be produced with the maximum efficiency from the power generated by the renewable energy source (100).

The method according to the present invention can be implemented as a computer-readable code on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and a carrier wave (for example, transmission via the Internet). The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (9)

A DC-AC converter that converts the DC power applied from a renewable energy source into a three-phase commercial AC voltage that can be directly used in an AC power supply system;
A distributor for distributing the AC voltage converted by the DC / AC converter to power applied to the water electrolytic bath and power applied to the AC power supply system;
And a plurality of transformers having different connection methods for adjusting the voltage level of the AC voltage to a usable voltage level in the water electrolysis vessel by receiving the AC voltage corresponding to the electric power applied to the water electrolyzer, A rectifying unit for rectifying the rectified AC voltage and converting it into a DC voltage usable in the water electrolytic bath; And
Analyzing the maximum hydrogen generation voltage at which the water electrolysis vessel can generate hydrogen with maximum efficiency and analyzing the power corresponding to the analyzed maximum hydrogen generation voltage and the required electric power of the AC power supply system, And a control unit for discriminating power to be supplied to the AC power supply system, respectively, and controlling the distributing unit according to the discrimination result,
Wherein the controller communicates with the AC power supply system to determine that the AC power supply system does not require power so that all of the AC voltage converted in the DC- And controls the AC power supply system such that power corresponding to the maximum hydrogen generation voltage is applied to the conversion rectification unit and the rest of the power is supplied to the AC power supply system when it is determined that the AC power supply system requires power Combined power circuit for renewable energy direct - coupled hydrogen generator. delete delete delete delete A control method of a hybrid power circuit for a renewable energy direct-coupled hydrogen generator,
Converting the direct current power applied from the renewable energy source into a three-phase commercial alternating current voltage which can be directly used in an alternating current power supply system which is a power system;
Analyzing the maximum hydrogen generation voltage at which the combined electrolytic cell can generate hydrogen with maximum efficiency;
The hybrid power circuit communicating with the AC power supply system to determine whether the AC power supply system requires power;
If the AC power supply system determines that the AC power supply system requires power, analyzes the power corresponding to the analyzed maximum hydrogen generation voltage and the required power of the AC power supply system analyzed by the hybrid power circuit, Discriminating and distributing power to be supplied to each of the supply systems; And
Wherein the combined power circuit adjusts the voltage level of the AC voltage to a voltage level usable in the water electrolysis tank by receiving the AC voltage corresponding to the electric power applied to the water electrolytic bath, And converting the DC voltage into a usable DC voltage in the water electrolyzer,
Wherein the distributing step comprises the steps of: distributing the mixed power circuit such that power corresponding to the maximum hydrogen generation voltage is applied to the water electrolyzer if it is determined that the AC power supply system requires power; And distributing the remaining power to the AC power supply system except for the power applied to the water electrolysis vessel. delete delete delete

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