Energy scheduling control method and system for photovoltaic off-grid electrolytic hydrogen production

Abstract

The invention provides an energy scheduling control method and system for photovoltaic off-grid electrolytic hydrogen production. The energy scheduling control method comprises the steps that photovoltaic input power is obtained through a photovoltaic module; the energy dispatching management module controls a hydrogen production power supply connected with the ALK electrolytic cell to work under constant current or constant power, and controls a hydrogen production power supply connected with the PEM electrolytic cell to work under an MPPT (Maximum Power Point Tracking) mode; the energy scheduling management module sets a plurality of photovoltaic power intervals according to photovoltaic input power; power distribution is carried out on the ALK electrolytic cell and the PEM electrolytic cell according to the multiple photovoltaic power intervals, and photovoltaic fluctuation power is dynamically adjusted; by means of the difference of the ALK electrolytic cell and the PEM electrolytic cell in the aspects of dynamic response speed and cost, the mode that multiple types of electrolytic cells operate cooperatively can be used at the same time, the adaptability of the electrolytic cells to photovoltaic fluctuation output is improved, differential utilization of the ALK electrolytic cell and the PEM electrolytic cell is achieved, the energy efficiency is improved, the cost is controlled, and economic benefits are maximized.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to an energy dispatching control method and system for off-grid photovoltaic electrolysis hydrogen production. Background Art

[0002] With the transformation of energy structure and large-scale application of renewable energy, photovoltaic hydrogen production, as a clean energy technology, can effectively utilize solar power generation to convert it into hydrogen energy, realizing photovoltaic consumption and green electricity hydrogen production.

[0003] Alkaline electrolysis hydrogen production technology is relatively mature and low-cost, but the energy conversion efficiency of the hydrogen production process is low. The cost of PEM electrolysis hydrogen production is relatively high compared to alkaline electrolysis, but the energy conversion efficiency is high. Economic benefits can be maximized through the coordinated production of hydrogen by multiple types of electrolyzers.

[0004] Different electrolyzers have different dynamic response characteristics. In addition, during off-grid hydrogen production, the randomness and volatility of photovoltaic energy causes the hydrogen production equipment to start and stop frequently. In addition, there is a cold start process during the startup of the electrolyzer. The unstable start and stop ultimately leads to a large amount of energy loss, resulting in low hydrogen production efficiency.

[0005] Common control strategies: The start-stop control strategy is used for a single electrolyzer, which needs to be started and stopped according to the actual power load. This method only considers the operating cost of the system, and does not consider the differences in response speed and hydrogen production efficiency of different electrolyzers. Although it can absorb photovoltaic energy, it does not further increase the system's hydrogen production. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide an energy scheduling control method and system for photovoltaic off-grid electrolysis hydrogen production, which utilizes the differences in dynamic response speed and cost between ALK electrolyzers and PEM electrolyzers, and can use multiple types of electrolyzers to operate in coordination at the same time, thereby improving the electrolyzer's adaptability to photovoltaic fluctuations, achieving differentiated utilization of ALK electrolyzers and PEM electrolyzers, improving energy efficiency and controlling costs, and maximizing economic benefits.

[0007] In a first aspect, an embodiment of the present invention provides an energy dispatching control method for off-grid photovoltaic electrolysis hydrogen production, which is applied to a control system, wherein the control system includes a photovoltaic module, an energy dispatching management module, a hydrogen production power supply group, an electrolyzer group, and a hydrogen storage device group;

[0008] The input end of the hydrogen production power supply group is connected to the photovoltaic module, the output end of the hydrogen production power supply group is connected to one end of the electrolyzer group, the other end of the electrolyzer group is connected to the hydrogen storage device group, and the hydrogen production power supply group is connected to the energy scheduling management module through an interface; wherein the hydrogen production power supply group includes multiple hydrogen production power supplies, and the electrolyzer group includes multiple ALK electrolyzers and multiple PEM electrolyzers; the method includes:

[0009] Acquiring photovoltaic input power through the photovoltaic module;

[0010] The energy scheduling management module controls the hydrogen production power supply connected to the ALK electrolyzer to operate under constant current or constant power, and controls the hydrogen production power supply connected to the PEM electrolyzer to operate under MPPT mode;

[0011] The energy scheduling management module sets a plurality of photovoltaic power intervals according to the photovoltaic input power;

[0012] Power is allocated to the ALK electrolyzer and the PEM electrolyzer according to the multiple photovoltaic power intervals, and the photovoltaic fluctuation power is dynamically adjusted.

[0013] Furthermore, the conditional constraints of each photovoltaic power interval are implemented in the following manner:

[0014]

[0015] Among them, P pemRunMin is the minimum operating power of the PEM electrolyzer, P alkReadyMin is the lower limit of the hot standby power of the ALK electrolyzer, P pemDynamic is the allowable fluctuating power of the PEM electrolyzer, indicating the limit of the photovoltaic fluctuating power, P alkRunMin is the minimum operating power of the ALK electrolyzer, P alkAdvise The recommended power for the ALK electrolyser, P pemRunMax is the maximum operating power of the PEM electrolyzer, P alkRunMax is the maximum operating power of the ALK electrolyzer; P 0 ~P 6 are the upper and lower limits of the photovoltaic input power in each photovoltaic power range.

[0016] Furthermore, power is allocated to the ALK electrolyzer and the PEM electrolyzer according to the plurality of photovoltaic power intervals, and photovoltaic fluctuation power is dynamically adjusted, including:

[0017] When the photovoltaic input power falls into the first interval [0, P 0), the hydrogen production power supply corresponding to the ALK electrolyzer and the hydrogen production power supply corresponding to the PEM electrolyzer are both not working;

[0018] When the photovoltaic input power falls into the second interval [P 0 , P 1 ), the hydrogen production power supply corresponding to the PEM electrolyzer is turned on and hot standby is enabled;

[0019] When the photovoltaic input power falls into the third interval [P 1 , P 2 ), the ALK electrolyzer starts the hot standby;

[0020] When the photovoltaic input power falls into the fourth interval [P 2 , P 3 ), the hydrogen production power source corresponding to the ALK electrolyzer is turned on, the output power of the PEM electrolyzer is set to be the sum of the minimum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the first residual energy is used by the ALK electrolyzer;

[0021] When the photovoltaic input power falls into the fifth interval [P 3 , P 4 ), the ALK electrolyzer sets the output power to the recommended power of the ALK electrolyzer, and the second surplus energy is used by the PEM electrolyzer;

[0022] When the photovoltaic input power falls into the sixth interval [P 4 , P 5 ), the PEM electrolyzer sets the output power to be the difference between the maximum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the third residual energy is used by the ALK electrolyzer;

[0023] When the photovoltaic input power falls into the seventh interval [P 5 , P 6 ), the ALK electrolyzer sets the output power to the maximum operating power of the ALK electrolyzer, and the fourth remaining energy is used by the PEM electrolyzer.

[0024] Furthermore, the method further comprises:

[0025] Calculating the power requirement of the ALK electrolyzer according to the power requirement of the PEM electrolyzer and the input power of the photovoltaic cell;

[0026] The power requirement of the ALK electrolyzer is calculated according to the following formula:

[0027] P alk =P pv -Ppem

[0028] Among them, P alk is the power requirement of the ALK electrolyzer, P pv is the photovoltaic input power, P pem is the power requirement of the PEM electrolyzer.

[0029] Furthermore, the method further comprises:

[0030] The energy scheduling management module collects the voltage, current and power of each hydrogen production power source in real time;

[0031] Calculate the total current and the total power according to the voltage, the current and the power;

[0032] The power of each hydrogen production power source is dynamically dispatched according to the total current or the total power.

[0033] In a second aspect, an embodiment of the present invention provides an energy dispatching and control system for off-grid photovoltaic electrolysis hydrogen production, the control system comprising a photovoltaic module, an energy dispatching and management module, a hydrogen production power supply group, an electrolyzer group and a hydrogen storage device group;

[0034] The input end of the hydrogen production power supply group is connected to the photovoltaic module, the output end of the hydrogen production power supply group is connected to one end of the electrolyzer group, the other end of the electrolyzer group is connected to the hydrogen storage device group, and the hydrogen production power supply group is connected to the energy scheduling management module through an interface; wherein the hydrogen production power supply group includes a plurality of hydrogen production power supplies, and the electrolyzer group includes a plurality of ALK electrolyzers and a plurality of PEM electrolyzers;

[0035] The photovoltaic module is used to obtain photovoltaic input power;

[0036] The energy scheduling management module is used to control the hydrogen production power supply connected to the ALK electrolyzer to operate under constant current or constant power, and to control the hydrogen production power supply connected to the PEM electrolyzer to operate under MPPT mode; to set multiple photovoltaic power intervals according to the photovoltaic input power; to distribute power to the ALK electrolyzer and the PEM electrolyzer according to the multiple photovoltaic power intervals, and to dynamically adjust the photovoltaic fluctuating power.

[0037] Furthermore, the conditional constraints of each photovoltaic power interval are implemented in the following manner:

[0038]

[0039] Among them, P pemRunMin is the minimum operating power of the PEM electrolyzer, P alkReadyMin is the lower limit of the hot standby power of the ALK electrolyzer, P pemDynamicis the allowable fluctuating power of the PEM electrolyzer, indicating the limit of the photovoltaic fluctuating power, P alkRunMin is the minimum operating power of the ALK electrolyzer, P alkAdvise The recommended power for the ALK electrolyser, P pemRunMax is the maximum operating power of the PEM electrolyzer, P alkRunMax is the maximum operating power of the ALK electrolyzer; P 0 ~P 6 are the upper and lower limits of the photovoltaic input power in each photovoltaic power range.

[0040] Furthermore, the energy scheduling management module is specifically used to:

[0041] When the photovoltaic input power falls into the first interval [0, P 0 ), the hydrogen production power supply corresponding to the ALK electrolyzer and the hydrogen production power supply corresponding to the PEM electrolyzer are both not working;

[0042] When the photovoltaic input power falls into the second interval [P 0 , P 1 ), the hydrogen production power supply corresponding to the PEM electrolyzer is turned on and hot standby is enabled;

[0043] When the photovoltaic input power falls into the third interval [P 1 , P 2 ), the ALK electrolyzer starts the hot standby;

[0044] When the photovoltaic input power falls into the fourth interval [P 2 , P 3 ), the hydrogen production power source corresponding to the ALK electrolyzer is turned on, the output power of the PEM electrolyzer is set to be the sum of the minimum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the first residual energy is used by the ALK electrolyzer;

[0045] When the photovoltaic input power falls into the fifth interval [P 3 , P 4 ), the ALK electrolyzer sets the output power to the recommended power of the ALK electrolyzer, and the second surplus energy is used by the PEM electrolyzer;

[0046] When the photovoltaic input power falls into the sixth interval [P 4 , P 5 ), the PEM electrolyzer sets the output power to be the difference between the maximum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the third residual energy is used by the ALK electrolyzer;

[0047] When the photovoltaic input power falls into the seventh interval [P 5 , P 6 ), the ALK electrolyzer sets the output power to the maximum operating power of the ALK electrolyzer, and the fourth remaining energy is used by the PEM electrolyzer.

[0048] In a third aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor implements the method described above when executing the computer program.

[0049] In a fourth aspect, an embodiment of the present invention provides a computer-readable medium having a non-volatile program code executable by a processor, wherein the program code enables the processor to execute the method as described above.

[0050] The embodiment of the present invention provides an energy scheduling control method and system for off-grid photovoltaic electrolysis hydrogen production, which is applied to a control system, wherein the control system includes a photovoltaic component, an energy scheduling management module, a hydrogen production power supply group, an electrolyzer group and a hydrogen storage device group; the input end of the hydrogen production power supply group is connected to the photovoltaic component, the output end of the hydrogen production power supply group is connected to one end of the electrolyzer group, the other end of the electrolyzer group is connected to the hydrogen storage device group, and the hydrogen production power supply group is connected to the energy scheduling management module through an interface; wherein the hydrogen production power supply group includes a plurality of hydrogen production power supplies, and the electrolyzer group includes a plurality of ALK electrolyzers and a plurality of PEM electrolyzers; the method includes: obtaining photovoltaic input power through the photovoltaic component; the energy scheduling management module controls the ALK electrolyzer group to be connected to the ALK electrolyzer group; The connected hydrogen production power source operates at constant current or constant power, and the hydrogen production power source connected to the PEM electrolyzer is controlled to operate in MPPT mode; the energy scheduling management module sets multiple photovoltaic power intervals according to the photovoltaic input power; power is allocated to the ALK electrolyzer and the PEM electrolyzer according to the multiple photovoltaic power intervals, and the photovoltaic fluctuation power is dynamically adjusted; by utilizing the differences in dynamic response speed and cost between the ALK electrolyzer and the PEM electrolyzer, multiple types of electrolyzers can be used in a coordinated operation mode at the same time, which improves the adaptability of the electrolyzer to the photovoltaic fluctuation output, realizes the differentiated utilization of the ALK electrolyzer and the PEM electrolyzer, improves energy efficiency and controls costs, and maximizes economic benefits.

[0051] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 A flow chart of an energy dispatching control method for off-grid photovoltaic electrolysis hydrogen production provided in the first embodiment of the present invention;

[0055] Figure 2 A schematic diagram of an energy dispatching and control system for off-grid photovoltaic electrolysis hydrogen production provided in the second embodiment of the present invention;

[0056] Figure 3 A schematic diagram of another energy dispatching and control system for off-grid photovoltaic electrolysis hydrogen production provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] To facilitate understanding of this embodiment, the embodiment of the present invention is described in detail below.

[0059] Embodiment 1:

[0060] Figure 1 This is a flow chart of the energy scheduling control method for off-grid photovoltaic electrolysis hydrogen production provided in Example 1 of the present invention.

[0061] Reference Figure 1 , applied to the control system, the control system includes photovoltaic components, energy scheduling management module, hydrogen production power group, electrolyzer group and hydrogen storage device group; the input end of the hydrogen production power group is connected to the photovoltaic components, the output end of the hydrogen production power group is connected to one end of the electrolyzer group, the other end of the electrolyzer group is connected to the hydrogen storage device group, and the hydrogen production power group is connected to the energy scheduling management module through an interface; wherein, the hydrogen production power group includes multiple hydrogen production power supplies, and the electrolyzer group includes multiple ALK electrolyzers and multiple PEM electrolyzers; the control strategy software of the energy scheduling management module communicates with multiple hydrogen production power supplies through a 485 interface, can collect the current and power of the hydrogen production power supply, and can control the mode of the hydrogen production power supply, target voltage, target current, target power, etc.

[0062] The method comprises the following steps:

[0063] Step S101, obtaining photovoltaic input power through photovoltaic modules;

[0064] Step S102, the energy scheduling management module controls the hydrogen production power source connected to the ALK electrolyzer to operate under constant current or constant power, and controls the hydrogen production power source connected to the PEM electrolyzer to operate under MPPT mode;

[0065] Here, the energy scheduling management module can also control the hydrogen production power source connected to the PEM electrolyzer to operate in the MPPT (Maximum Power Point Tracking) mode, that is, the maximum power point tracking method is adopted to ensure the maximum output of the photovoltaic.

[0066] Step S103, the energy scheduling management module sets a plurality of photovoltaic power intervals according to the photovoltaic input power;

[0067] Step S104, allocating power to the ALK electrolyzer and the PEM electrolyzer according to a plurality of photovoltaic power intervals, and dynamically adjusting the photovoltaic fluctuation power.

[0068] In this embodiment, during the dynamic operation of the control strategy, the system controls the distribution of photovoltaic energy according to the capacity configuration of the hydrogen production electrolyzer equipment, and distributes photovoltaic energy with lower fluctuations to the ALK electrolyzer (alkaline electrolyzer) for consumption and utilization, thereby ensuring the stability of the alkaline electrolyzer; photovoltaic energy with larger fluctuations is distributed to the PEM electrolyzer to fully utilize the advantage of the PEM electrolyzer's fast response.

[0069] Furthermore, the conditional constraints of each photovoltaic power interval are implemented in the following way:

[0070]

[0071] Among them, P pemRunMin is the minimum operating power of the PEM electrolyzer, P alkReadyMin is the lower limit of the hot standby power of the ALK electrolyzer, P pemDynamic is the allowable fluctuating power of the PEM electrolyzer, indicating the limit of the photovoltaic fluctuating power, P alkRunMin is the minimum operating power of the ALK electrolyzer, P alkAdvise The recommended power of ALK electrolyzer, P pemRunMax is the maximum operating power of the PEM electrolyzer, P alkRunMax is the maximum operating power of the ALK electrolyzer; P 0 ~P 6 It is the upper and lower limits of the photovoltaic input power in each photovoltaic power range.

[0072] Specifically, when designing, the control strategy software of the energy scheduling management module needs to configure the upper and lower power limits and hot standby power required by the PEM electrolyzer and ALK electrolyzer to ensure the safety of the electrolyzer, while also dynamically adjusting the photovoltaic fluctuation power. Therefore, 7 photovoltaic power intervals are set to distribute power to the system consisting of the PEM electrolyzer and the ALK electrolyzer. The conditional constraints for each power interval can refer to formula (2).

[0073] P pemDynamic Indicates the limit of the photovoltaic power fluctuation, which is absorbed by the PEM electrolyzer; when the power is small and about to drop, ensure that the PEM electrolyzer is allocated at least P pemRunMin +P pemDynamic , so that when the photovoltaic power decreases, it can avoid touching P pemRunMin , ensure the stable operation of PEM electrolyzer;

[0074] When the power is large and rising, ensure that the PEM electrolyzer operates at P pemRunMax -P pemDynamic , can not touch P pemRunMax , ensuring that the excess power caused by increased photovoltaic fluctuations is allocated to the ALK electrolyzer for use.

[0075] Further, step S104 includes the following steps:

[0076] Step S301: When the photovoltaic input power falls into the first interval [0, P 0 ), the hydrogen production power supply corresponding to the ALK electrolyzer and the hydrogen production power supply corresponding to the PEM electrolyzer are both inoperative;

[0077] Here, when the photovoltaic input power falls into the first interval [0, P 0 ), the photovoltaic power is insufficient, and the hydrogen production power supply corresponding to the ALK electrolyzer and the hydrogen production power supply corresponding to the PEM electrolyzer do not work.

[0078] Step S302: When the photovoltaic input power falls into the second interval [P 0 , P 1 ), the hydrogen production power supply corresponding to the PEM electrolyzer is turned on and hot standby is enabled;

[0079] Here, when the photovoltaic input power falls into the second interval [P 0 , P 1 ) when it exceeds P pemRunMin , the hydrogen production power supply corresponding to the PEM electrolyzer is turned on and hot standby is enabled. Among them, hot standby refers to the equipment that heats the electrolyte.

[0080] Step S303: When the photovoltaic input power falls into the third interval [P 1 , P2 ) when the ALK electrolyzer starts hot standby;

[0081] Here, when the photovoltaic input power falls into the third interval [P 1 , P 2 ) when it exceeds P pemRunMin +P alkReadyMin , ALK electrolyzer starts hot standby.

[0082] Step S304: When the photovoltaic input power falls into the fourth interval [P 2 , P 3 ), the hydrogen production power supply corresponding to the ALK electrolyzer is turned on, the output power of the PEM electrolyzer is set to be the sum of the minimum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the first residual energy is used by the ALK electrolyzer;

[0083] Here, when the photovoltaic input power falls into the fourth interval [P 2 , P 3 ) when it exceeds P pemRunMin +P pemDynamic +P alkRunMin , the hydrogen production power supply corresponding to the ALK electrolyzer is turned on, and the output power of the PEM electrolyzer is set to P pemRunMin +P pemDynamic , the first surplus energy is used by the ALK electrolyzer.

[0084] Step S305: When the photovoltaic input power falls into the fifth interval [P 3 , P 4 ), the ALK electrolyzer sets the output power to the recommended power of the ALK electrolyzer, and the second remaining energy is used by the PEM electrolyzer;

[0085] Here, when the photovoltaic input power falls into the fifth interval [P 3 , P 4 ) when it exceeds P pemRunMin +P pemDynamic +P alkAdvise , ALK electrolyzer set output power to P alkAdvise , and the second surplus energy is used by the PEM electrolyzer.

[0086] Step S306: When the photovoltaic input power falls into the sixth interval [P 4 , P 5 ), the output power of the PEM electrolyzer is set to the difference between the maximum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the third residual energy is used by the ALK electrolyzer;

[0087] Here, when the photovoltaic input power falls into the sixth interval [P 4 , P 5) when it exceeds P pemRunMax -P pemDynamic +P alkAdvise , the PEM electrolyzer is set to output power P pemRunMax -P pemDynamic , and the third remaining energy is used by the ALK electrolyzer.

[0088] Step S307: When the photovoltaic input power falls into the seventh interval [P 5 , P 6 ), the ALK electrolyzer sets the output power to the maximum operating power of the ALK electrolyzer, and the fourth remaining energy is used by the PEM electrolyzer.

[0089] Here, when the photovoltaic input power falls into the seventh interval [P 5 , P 6 ) when it exceeds P pemRunMax -P pemDynamic +P alkRunMax , ALK electrolyzer set output power to P alkRunMax , and the fourth remaining energy is used by the PEM electrolyzer.

[0090] Due to the volatility of photovoltaic energy output, when PPV crosses intervals, it is necessary to set a certain time hysteresis and energy hysteresis to avoid frequent interval jumps.

[0091] Collect energy efficiency data such as hydrogen production and electricity consumption of electrolyzers, adjust power weights, and further optimize energy efficiency. The power boundaries of each of the above intervals can be fine-tuned according to energy efficiency conditions.

[0092] Furthermore, the method further comprises the following steps:

[0093] Step S401, calculating the required power of the ALK electrolyzer according to the required power of the PEM electrolyzer and the input power of the photovoltaic;

[0094] The required power of the ALK electrolyzer is calculated according to formula (2):

[0095] P alk =P pv -P pem (2)

[0096] Among them, P alk is the power requirement of ALK electrolyzer, P pv is the photovoltaic input power, P pem is the power requirement of the PEM electrolyzer.

[0097] Specifically, the energy obtained by the hydrogen production power source from the output side of the photovoltaic module is used for the electrolyzer except for a small amount of backup loss, and the damage energy is negligible.

[0098] Furthermore, the method further comprises the following steps:

[0099] Step S501, the energy scheduling management module collects the voltage, current and power of each hydrogen production power source in real time;

[0100] Step S502, calculating the total current and the total power according to the voltage, current and power;

[0101] Step S503: dynamically dispatch the power of each hydrogen production power source according to the total current or total power.

[0102] Specifically, the control strategy software of the energy scheduling management module can also collect and summarize the voltage, current, power and other parameters of each hydrogen production power source in real time, and dynamically schedule the power of each hydrogen production power source after feedback of the total current or total power parameter, such as giving the target power of the alkali cell power source in real time. Among them, the current, voltage and power of the hydrogen production power source need to set the working upper limit, and match the capacity of the electrolyzer equipment.

[0103] The present application utilizes fluctuating power, taking advantage of the fast response speed of the PEM electrolyzer to absorb the photovoltaic fluctuating power as much as possible, and adopts the maximum power tracking method to ensure the maximum output of the photovoltaic power and realize the maximum utilization of solar energy; it is necessary to use the ALK electrolyzer to absorb the stable power of the photovoltaic power as much as possible; and finally achieve the optimal solution for electrolysis efficiency and cost.

[0104] Embodiment 2:

[0105] Figure 2 Schematic diagram of an energy dispatching and control system for off-grid photovoltaic electrolysis hydrogen production provided in Embodiment 2 of the present invention.

[0106] Reference Figure 2 The control system includes a photovoltaic module, an energy scheduling management module, a hydrogen production power supply group, an electrolyzer group and a hydrogen storage device group; the input end of the hydrogen production power supply group is connected to the photovoltaic module, the output end of the hydrogen production power supply group is connected to one end of the electrolyzer group, the other end of the electrolyzer group is connected to the hydrogen storage device group, and the hydrogen production power supply group is connected to the energy scheduling management module through an interface;

[0107] Among them, refer to Figure 3 , the hydrogen production power supply group includes multiple hydrogen production power supplies, and the electrolyzer group includes multiple ALK electrolyzers and multiple PEM electrolyzers;

[0108] Photovoltaic modules, used to obtain photovoltaic input power;

[0109] The energy scheduling management module is used to control the hydrogen production power supply connected to the ALK electrolyzer to operate under constant current or constant power, and to control the hydrogen production power supply connected to the PEM electrolyzer to operate under MPPT mode; set multiple photovoltaic power intervals according to the photovoltaic input power; allocate power to the ALK electrolyzer and the PEM electrolyzer according to the multiple photovoltaic power intervals, and dynamically adjust the photovoltaic fluctuation power.

[0110] Furthermore, the conditional constraints of each photovoltaic power interval are implemented in the following way:

[0111]

[0112] Among them, P pemRunMin is the minimum operating power of the PEM electrolyzer, P alkReadyMin is the lower limit of the hot standby power of the ALK electrolyzer, P pemDynamic is the allowable fluctuating power of the PEM electrolyzer, indicating the limit of the photovoltaic fluctuating power, P alkRunMin is the minimum operating power of the ALK electrolyzer, P alkAdvise The recommended power of ALK electrolyzer, P pemRunMax is the maximum operating power of the PEM electrolyzer, P alkRunMax is the maximum operating power of the ALK electrolyzer; P 0 ~P 6 It is the upper and lower limits of the photovoltaic input power in each photovoltaic power range.

[0113] Furthermore, the energy scheduling management module is specifically used for:

[0114] When the photovoltaic input power falls into the first interval [0, P 0 ), the hydrogen production power supply corresponding to the ALK electrolyzer and the hydrogen production power supply corresponding to the PEM electrolyzer are both inoperative;

[0115] When the photovoltaic input power falls into the second interval [P 0 , P 1 ), the hydrogen production power supply corresponding to the PEM electrolyzer is turned on and hot standby is enabled;

[0116] When the photovoltaic input power falls into the third interval [P 1 , P 2 ) when the ALK electrolyzer starts hot standby;

[0117] When the photovoltaic input power falls into the fourth interval [P 2 , P 3 ), the hydrogen production power supply corresponding to the ALK electrolyzer is turned on, the output power of the PEM electrolyzer is set to be the sum of the minimum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the first residual energy is used by the ALK electrolyzer;

[0118] When the photovoltaic input power falls into the fifth interval [P 3 , P 4 ), the ALK electrolyzer sets the output power to the recommended power of the ALK electrolyzer, and the second remaining energy is used by the PEM electrolyzer;

[0119] When the photovoltaic input power falls into the sixth interval [P 4 , P 5 ), the output power of the PEM electrolyzer is set to the difference between the maximum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the third residual energy is used by the ALK electrolyzer;

[0120] When the photovoltaic input power falls into the seventh interval [P 5 , P 6 ), the ALK electrolyzer sets the output power to the maximum operating power of the ALK electrolyzer, and the fourth remaining energy is used by the PEM electrolyzer.

[0121] An embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the energy scheduling control method for photovoltaic off-grid electrolysis hydrogen production provided in the above embodiment are implemented.

[0122] An embodiment of the present invention also provides a computer-readable medium having a non-volatile program code executable by a processor, wherein a computer program is stored on the computer-readable medium, and when the computer program is executed by the processor, the steps of the energy scheduling control method for photovoltaic off-grid electrolysis hydrogen production of the above embodiment are executed.

[0123] The computer program product provided in the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be found in the method embodiment and will not be repeated here.

[0124] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0125] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0126] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0127] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0128] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An energy dispatching and control method for off-grid photovoltaic electrolysis hydrogen production, characterized in that: Applied to a control system, the control system includes a photovoltaic module, an energy dispatch management module, a hydrogen production power supply group, an electrolyzer group and a hydrogen storage device group; The input end of the hydrogen production power supply group is connected to the photovoltaic module, the output end of the hydrogen production power supply group is connected to one end of the electrolyzer group, the other end of the electrolyzer group is connected to the hydrogen storage device group, and the hydrogen production power supply group is connected to the energy scheduling management module through an interface; wherein the hydrogen production power supply group includes multiple hydrogen production power supplies, and the electrolyzer group includes multiple ALK electrolyzers and multiple PEM electrolyzers; the method includes: Acquiring photovoltaic input power through the photovoltaic module; The energy scheduling management module controls the hydrogen production power supply connected to the ALK electrolyzer to operate under constant current or constant power, and controls the hydrogen production power supply connected to the PEM electrolyzer to operate under MPPT mode; The energy scheduling management module sets a plurality of photovoltaic power intervals according to the photovoltaic input power; Power is allocated to the ALK electrolyzer and the PEM electrolyzer according to the multiple photovoltaic power intervals, and the photovoltaic fluctuation power is dynamically adjusted.

2. The energy dispatching and control method for off-grid photovoltaic electrolysis hydrogen production according to claim 1, characterized in that: The conditional constraints of each photovoltaic power interval are implemented in the following way: Among them, P pemRunMin is the minimum operating power of the PEM electrolyzer, P alkReadyMin is the lower limit of the hot standby power of the ALK electrolyzer, P pemDynamic is the allowable fluctuating power of the PEM electrolyzer, indicating the limit of the photovoltaic fluctuating power, P alkRunMin is the minimum operating power of the ALK electrolyzer, P alkAdvise The recommended power for the ALK electrolyser, P pemRunMax is the maximum operating power of the PEM electrolyzer, P alkRunMax is the maximum operating power of the ALK electrolyzer; P0~P6 are the upper and lower limits of the photovoltaic input power in each photovoltaic power range.

3. The energy dispatching and control method for off-grid photovoltaic electrolysis hydrogen production according to claim 2 is characterized in that: Power is distributed to the ALK electrolyzer and the PEM electrolyzer according to the plurality of photovoltaic power intervals, and photovoltaic fluctuation power is dynamically adjusted, including: When the photovoltaic input power falls into the first interval [0, P0), the hydrogen production power supply corresponding to the ALK electrolyzer and the hydrogen production power supply corresponding to the PEM electrolyzer do not work; When the photovoltaic input power falls into the second interval [P0, P1), the hydrogen production power supply corresponding to the PEM electrolyzer is turned on and hot standby is enabled; When the photovoltaic input power falls into the third interval [P1, P2), the ALK electrolyzer turns on the hot standby; When the photovoltaic input power falls into the fourth interval [P2, P3), the hydrogen production power source corresponding to the ALK electrolyzer is turned on, the PEM electrolyzer sets the output power to be the sum of the minimum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the first residual energy is used by the ALK electrolyzer; When the photovoltaic input power falls into the fifth interval [P3, P4), the ALK electrolyzer sets the output power to the recommended power of the ALK electrolyzer, and the second residual energy is used by the PEM electrolyzer; When the photovoltaic input power falls into the sixth interval [P4, P5), the PEM electrolyzer sets the output power to be the difference between the maximum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the third residual energy is used by the ALK electrolyzer; When the photovoltaic input power falls into the seventh interval [P5, P6), the ALK electrolyzer sets the output power to the maximum operating power of the ALK electrolyzer, and the fourth remaining energy is used by the PEM electrolyzer.

4. The energy dispatching and control method for off-grid photovoltaic electrolysis hydrogen production according to claim 1, characterized in that: The method further comprises: Calculating the power requirement of the ALK electrolyzer according to the power requirement of the PEM electrolyzer and the input power of the photovoltaic cell; The power requirement of the ALK electrolyzer is calculated according to the following formula: P alk =P pv -P pem Among them, P alk is the power requirement of the ALK electrolyzer, P pv is the photovoltaic input power, P pem is the power requirement of the PEM electrolyzer.

5. The energy dispatching and control method for off-grid photovoltaic electrolysis hydrogen production according to claim 1, characterized in that: The method further comprises: The energy scheduling management module collects the voltage, current and power of each hydrogen production power source in real time; Calculate the total current and the total power according to the voltage, the current and the power; The power of each hydrogen production power source is dynamically dispatched according to the total current or the total power.

6. An energy dispatching and control system for off-grid photovoltaic electrolysis hydrogen production, characterized in that: The control system includes a photovoltaic module, an energy dispatching management module, a hydrogen production power supply group, an electrolyzer group and a hydrogen storage device group; The input end of the hydrogen production power supply group is connected to the photovoltaic module, the output end of the hydrogen production power supply group is connected to one end of the electrolyzer group, the other end of the electrolyzer group is connected to the hydrogen storage device group, and the hydrogen production power supply group is connected to the energy scheduling management module through an interface; wherein the hydrogen production power supply group includes a plurality of hydrogen production power supplies, and the electrolyzer group includes a plurality of ALK electrolyzers and a plurality of PEM electrolyzers; The photovoltaic module is used to obtain photovoltaic input power; The energy scheduling management module is used to control the hydrogen production power supply connected to the ALK electrolyzer to operate under constant current or constant power, and to control the hydrogen production power supply connected to the PEM electrolyzer to operate under MPPT mode; to set multiple photovoltaic power intervals according to the photovoltaic input power; to distribute power to the ALK electrolyzer and the PEM electrolyzer according to the multiple photovoltaic power intervals, and to dynamically adjust the photovoltaic fluctuating power.

7. The energy dispatching and control system for off-grid photovoltaic electrolysis hydrogen production according to claim 6, characterized in that: The conditional constraints of each photovoltaic power interval are implemented in the following way: Among them, P pemRunMin is the minimum operating power of the PEM electrolyzer, P alkReadyMin is the lower limit of the hot standby power of the ALK electrolyzer, P pemDynamic is the allowable fluctuating power of the PEM electrolyzer, indicating the limit of the photovoltaic fluctuating power, P alkRunMin is the minimum operating power of the ALK electrolyzer, P alkAdvise The recommended power for the ALK electrolyser, P pemRunMax is the maximum operating power of the PEM electrolyzer, P alkRunMax is the maximum operating power of the ALK electrolyzer; P0~P6 are the upper and lower limits of the photovoltaic input power in each photovoltaic power range.

8. The energy dispatching and control system for off-grid photovoltaic electrolysis hydrogen production according to claim 7, characterized in that: The energy scheduling management module is specifically used for: When the photovoltaic input power falls into the first interval [0, P0), the hydrogen production power supply corresponding to the ALK electrolyzer and the hydrogen production power supply corresponding to the PEM electrolyzer do not work; When the photovoltaic input power falls into the second interval [P0, P1), the hydrogen production power supply corresponding to the PEM electrolyzer is turned on and hot standby is enabled; When the photovoltaic input power falls into the third interval [P1, P2), the ALK electrolyzer turns on the hot standby; When the photovoltaic input power falls into the fourth interval [P2, P3), the hydrogen production power source corresponding to the ALK electrolyzer is turned on, the PEM electrolyzer sets the output power to be the sum of the minimum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the first residual energy is used by the ALK electrolyzer; When the photovoltaic input power falls into the fifth interval [P3, P4), the ALK electrolyzer sets the output power to the recommended power of the ALK electrolyzer, and the second residual energy is used by the PEM electrolyzer; When the photovoltaic input power falls into the sixth interval [P4, P5), the PEM electrolyzer sets the output power to be the difference between the maximum operating power of the PEM electrolyzer and the allowable fluctuating power of the PEM electrolyzer, and the third residual energy is used by the ALK electrolyzer; When the photovoltaic input power falls into the seventh interval [P5, P6), the ALK electrolyzer sets the output power to the maximum operating power of the ALK electrolyzer, and the fourth remaining energy is used by the PEM electrolyzer.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 5 is implemented.

10. A computer readable medium having a non-volatile program code executable by a processor, characterized in that: The program code enables the processor to execute the method according to any one of claims 1 to 5.

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