CN115642619A - Renewable energy hydrogen production system, control method thereof and storage medium - Google Patents
Renewable energy hydrogen production system, control method thereof and storage medium Download PDFInfo
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Abstract
The invention relates to a renewable energy hydrogen production system, a control method and a storage medium thereof, wherein the renewable energy hydrogen production system comprises a renewable energy power generation system, a hydrogen production system and a controller, wherein a main power circuit in a hydrogen production power supply of the controller is used for rectifying three-phase alternating current of a bus and then supplying power to one or more electrolytic cells under the condition that the main power circuit is in a first working mode; under the condition that the main circuit of the power supply is in a second working mode, the main circuit of the power supply is used for rectifying the three-phase alternating current of the bus and supplying power to one or more electrolytic cells, and simultaneously inverting and outputting the redundant electric energy into reactive current to realize reactive compensation; the controller is used for detecting the power generation power of the renewable energy power generation system and the active power and the reactive power of the grid-connected point of the hydrogen production system; and controlling the working state of the hydrogen production system and the working mode of the main circuit of the power supply according to the generated power, the active power and the reactive power of the grid-connected point.
Description
Technical Field
The disclosure relates to the field of hydrogen production, in particular to a renewable energy hydrogen production system, a control method and a storage medium thereof.
Background
The hydrogen production by renewable energy sources can ensure that the power source for hydrogen production by water electrolysis is clean energy by combining the renewable energy sources with the water electrolysis hydrogen production technology, thereby realizing cleanness and low carbon of the hydrogen energy industry in the whole life cycle. The hydrogen production by renewable energy can be connected with the renewable energy and the hydrogen energy, and the preparation process of the hydrogen is clean and low-carbon.
In the related art, because the generated electricity quantity of the renewable energy source is unstable, the situation of large fluctuation exists, and the influence on the electric energy quality of the whole hydrogen production system is larger under the situation. In such application scenarios, the increase of power electronic devices also has a great influence on the power quality of the power grid, resulting in a power factor lower than a required value. The current approach to increasing the power factor is usually to add additional reactive compensation equipment. Although the reactive compensation device has good compensation effect, the reactive compensation device can increase additional investment cost.
Disclosure of Invention
The purpose of this disclosure is to provide a renewable energy hydrogen production system, a control method thereof, and a storage medium.
According to a first aspect of the embodiments of the present disclosure, there is provided a renewable energy hydrogen production system, the system including a renewable energy power generation system, a hydrogen production system, and a controller, the renewable energy power generation system, the hydrogen production system, and the controller being connected by a bus and connected to a public power grid through a substation;
the hydrogen production system comprises a hydrogen production power supply and one or more electrolysis baths;
the power supply main circuit in the hydrogen production power supply is used for rectifying the three-phase alternating current of the bus to supply power to the one or more electrolytic cells under the condition that the power supply main circuit is in a first working mode; the power supply main circuit is used for rectifying the three-phase alternating current of the bus to supply power to the one or more electrolytic cells and inverting and outputting redundant electric energy to reactive current to realize reactive compensation under the condition that the power supply main circuit is in a second working mode;
the controller is used for detecting the power generation power of the renewable energy power generation system and the active power and the reactive power of the grid-connected point of the hydrogen production system; and controlling the working state of the hydrogen production system and the working mode of the main circuit of the power supply according to the generated power, the active power and the reactive power of the grid-connected point.
Optionally, the operating state of the hydrogen production system includes a start-stop state and a surge state, and the controller is configured to:
under the condition that the generated power is detected to be gradually increased from zero to first power and the increased time is kept to be greater than or equal to a first preset time, determining that the hydrogen production system is in a start-stop state; and the number of the first and second groups,
when the generated power is detected to be gradually reduced to a second power from the maximum generated power of the renewable energy power generation system, and the reduction duration is kept to be greater than or equal to a second preset duration, determining that the hydrogen production system is in a start-stop state;
under the condition that the generated power is detected to gradually increase from zero to the first power and the increasing duration is kept to be less than the first preset duration, or under the condition that the generated power is detected to start to increase from the third power to the fourth power, determining that the hydrogen production system is in a fluctuation state;
under the condition that the generated power is detected to be gradually reduced from the maximum generated power of the renewable energy power generation system to the second power and the reduction duration is kept less than the second preset duration, or under the condition that the generated power is detected to be reduced from the fifth power to the sixth power, determining that the hydrogen production system is in a fluctuation state;
wherein the third power is greater than zero and the fifth power is less than the maximum generated power.
Optionally, the controller is to:
and under the condition that the hydrogen production system is determined to be in a starting and stopping state, controlling the main power supply circuit to be in a first working mode, and controlling the plurality of electrolytic tanks to be started one by one or controlling the plurality of electrolytic tanks to be stopped one by one according to the generated power.
Optionally, the controller is to:
under the condition that the hydrogen production system is determined to be in a fluctuation state, if the generated power is increased, controlling the main power supply circuit to be in the first working mode;
under the condition that the hydrogen production system is determined to be in a fluctuation state, if the generated power is reduced and is larger than a preset fluctuation threshold value, controlling the main power supply circuit to be in the first working mode;
and under the condition that the hydrogen production system is determined to be in a fluctuation state, if the generated power is reduced to be less than or equal to the preset fluctuation threshold value and a preset switching condition is met, controlling the main power supply circuit to be in the second working mode.
Optionally, the controller is to:
under the condition that the main power supply circuit is in the second working mode, determining a reactive compensation current value according to the active power and the reactive power of the grid-connected point of the hydrogen production system;
and sending the reactive compensation current value to the hydrogen production power supply so that the hydrogen production power supply carries out reactive compensation according to the reactive compensation current value.
Optionally, the controlling the plurality of electrolysis cells to be turned on one by one according to the generated power comprises:
determining the total value of the rated power of the started electrolytic cell;
and controlling the next electrolytic tank to be opened under the condition that the difference value between the generated power and the total value is greater than the minimum starting power of the electrolytic tank until the generated power reaches the first power.
Optionally, controlling the plurality of electrolysis cells to be shut down one by one according to the generated power comprises:
determining the total value of the rated power of N-1 electrolytic cells, wherein N is the number of the currently started electrolytic cells;
and under the condition that the difference value between the generated power and the total value is smaller than the minimum starting power of the electrolytic cell, controlling the Nth electrolytic cell to stop until the generated power reaches the second power.
Optionally, the controller is further configured to:
and averagely distributing the power difference value of the generated power and the total value of the rated power of the started electrolytic cell to the started electrolytic cell.
According to a second aspect of the embodiments of the present disclosure, there is provided a control method of a renewable energy hydrogen production system, applied to the renewable energy hydrogen production system according to any one of the first aspects of the present disclosure, the method including:
detecting the generated power of the renewable energy power generation system and the active power and the reactive power of a grid-connected point of the hydrogen production system;
and controlling the working state of the hydrogen production system and the working mode of the main circuit of the power supply according to the generated power, the active power and the reactive power of the grid-connected point.
According to a third aspect of embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of the second aspect of the present disclosure.
Through the technical scheme, through adopting novel power to utilize the controller to control the operating condition of hydrogen manufacturing system according to generated power, the active power and the reactive power of grid-connected point, and the mode of operation of power main circuit, so that this power main circuit not only can realize the function of rectification and can also when needing to carry out reactive compensation, will remove in the hydrogen manufacturing power supply and supply power for the electrolysis trough outer redundant electric energy contravariant output and for reactive current in order to realize reactive compensation, need not to set up extra reactive compensation equipment alone, reduced hydrogen manufacturing cost when guaranteeing electric energy quality effectively, the operation process capacity redundancy that can maximize performance power.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a renewable energy hydrogen production system, according to an exemplary embodiment.
FIG. 2 is a flow diagram illustrating a method for producing hydrogen from a renewable energy source, according to an exemplary embodiment.
FIG. 3 is a flow chart illustrating a method of determining an operating condition of a hydrogen production system in accordance with an exemplary embodiment.
FIG. 4 is a flow chart illustrating a method of controlling a surge condition in accordance with an exemplary embodiment.
FIG. 5 is a block diagram of an electronic device shown in accordance with an example embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In order to make those skilled in the art more understand the improvement of the technical solution provided by the present disclosure, the present disclosure first further introduces the related art.
The hydrogen production by renewable energy sources can ensure that the power source for hydrogen production by water electrolysis is clean energy by combining the renewable energy sources with the water electrolysis hydrogen production technology, thereby realizing cleanness and low carbon of the hydrogen energy industry in the whole life cycle. The hydrogen production by renewable energy can be connected with the renewable energy and the hydrogen energy, so that the hydrogen production process is clean and low-carbon, and the hydrogen production method plays a key role in the cleanness and low-carbon of the whole hydrogen energy industry. The key problem in the existing hydrogen production system by using renewable energy sources is that the power generated by the renewable energy sources has high fluctuation, the power is easily influenced by external factors, and the hydrogen production system is easily operated unstably. Frequent power fluctuation can cause the electrolytic cell to deviate from a rated working state, the hydrogen production efficiency is reduced, the starting and stopping times of the electrolytic cell are increased, and the service life of the electrolytic cell is shortened. In order to absorb the power generation amount of renewable energy sources, a plurality of electrolytic cells are usually operated in parallel or a booster station is commonly used, and the two modes have great influence on the power quality of a power grid. And a large amount of power electronic equipment is included in the project, the problems of unqualified grid-connected power factor, voltage deviation, voltage fluctuation, flicker and the like can be caused, and the safe and stable operation of the power supply and utilization equipment is seriously influenced by the quality problems of the electric energy.
At present, a renewable energy hydrogen production system is in an initial development stage, the industry lacks a special research on a reactive compensation control strategy of the renewable energy hydrogen production system, and a reactive compensation device is added in a reactive compensation scheme of a new energy power station generally. At present, reactive power compensation devices mainly include synchronous phase modulators, mechanically switched parallel capacitor banks, large-capacity SVC (Static Var Compensator), SVG (Static Var Generator). The synchronous phase modulator has the advantages of high loss and noise during operation, tedious maintenance and low response speed, and can not meet the requirement of the current power grid on rapid dynamic compensation. Although the parallel capacitor bank is flexible and can be directly used in a high-voltage power grid, the impedance value of the parallel capacitor bank is fixed, and dynamic reactive compensation cannot be performed on the power grid. The SVC itself is a harmonic source, and although it can compensate for reactive power in the system, it also generates harmonic pollution itself, and filters are additionally added. Although SVG can realize dynamic real-time reactive power compensation, SVG has a high cost.
In addition, due to the fact that the fluctuation of the generated energy of the renewable energy sources is large, the capacity of the hydrogen production power supply does not work under the rated full-load working condition all the time, and the capacity redundancy phenomenon often occurs.
Based on the above background, in order to solve the technical problems in the related art, the present disclosure provides a renewable energy hydrogen production system, a control method thereof, and a storage medium.
Fig. 1 is a schematic diagram of a renewable energy hydrogen production system according to an exemplary embodiment, as shown in fig. 1, the renewable energy hydrogen production system includes a renewable energy power generation system 110, a hydrogen production system 120, and a controller 130, the renewable energy power generation system 110, the hydrogen production system 120, and the controller 130 are connected by a bus and are connected to a utility grid 150 by a substation 140;
the hydrogen production system 120 comprises a hydrogen production power supply 121 and one or more electrolysis cells 122, and a main power supply circuit in the hydrogen production power supply 121 is used for rectifying three-phase alternating current of the bus to supply power to the one or more electrolysis cells 122 under the condition of a first working mode; under the condition that the main power supply circuit is in a second working mode, the main power supply circuit is used for rectifying the three-phase alternating current of the bus and supplying power to the one or more electrolysis baths 122, and simultaneously inverting and outputting redundant electric energy into reactive current to realize reactive compensation;
the controller 130 is configured to detect the generated power of the renewable energy power generation system 110, and the active power and the reactive power of the grid-connected point of the hydrogen production system 120; and controlling the working state of the hydrogen production system 120 and the working mode of the main circuit of the power supply according to the generated power, the active power and the reactive power of the grid-connected point.
It is understood that the redundant power is the power remaining after rectification of the power generated by the renewable energy power generation system 110 to power the one or more electrolysis cells 122.
Referring to fig. 1, renewable energy power generation system 110 may be a water/tidal power generation system, a photovoltaic power generation system, a wind power generation system, etc., and hydrogen production system 120 may further include an aftertreatment system, etc., without limitation to the present disclosure.
The main circuit of the power supply may be a fully controlled IGBT (Insulated Gate Bipolar Transistor) device (including all devices capable of bidirectional flow), and when the main circuit is in the first operating mode, the main circuit may achieve a rectification function to supply power to the hydrogen production electrolytic cell 122. When the main circuit is in the second working mode, the reactive compensation function can be realized on the basis of rectification power supply.
Specifically, in the rectification mode, the three-phase alternating current of the power grid is rectified by the IGBT main circuit and then is connected with the positive and negative electrodes of the electrolytic cell 122, so as to be converted into the direct current required by the electrolytic cell 122. In the reactive compensation mode, the main power circuit can output the electric energy on the bus after being inverted by the IGBT main circuit and the reactive current of the power grid, the amplitude of the electric energy is equal to the reactive power consumed by the hydrogen production system 120, and the phase of the electric energy is opposite to that of the reactive power consumed by the hydrogen production system, so that the electric energy is offset with the reactive current of the power grid, and the reactive compensation function is realized.
Referring to fig. 1, the controller 130 is connected to the renewable energy power generation system 110, the hydrogen production system 120, and the utility grid 150, and is capable of monitoring the real-time power generated by the renewable energy and the active power and the reactive power of the hydrogen production grid-connected point in real time, and sending an operation instruction according to the electric quantity, for example, determining that the system control mode is in a start-stop state or a fluctuation state, and adjusting the system operation mode; adjusting the electrolyzer 122 to start and shut down; and adjusting the working mode of the power supply by combining the power generation power of the renewable energy source and the reactive power condition of the grid-connected point, selecting whether to perform reactive compensation or not, and feeding back power grid information to the power supply.
The Controller 130 may be a PLC (Programmable Logic Controller), an ARM (Advanced RISC machine, RISC microprocessor), or a DSP (Digital Signal Processing) chip, so as to ensure that the system requirement can be responded to quickly.
In the embodiment of the present disclosure, by using a novel power supply and controlling the operating state of the hydrogen production system 120 according to the generated power, the active power of the grid-connected point and the reactive power by using the controller 130, and the operating mode of the main power supply circuit, the main power supply circuit can not only realize the function of rectification, but also output the redundant electric energy inversion output except for supplying power to the electrolyzer in the hydrogen production power supply 121 as reactive current to realize reactive compensation when reactive compensation is needed, and no additional reactive compensation device is needed to be separately arranged, thereby effectively reducing the hydrogen production cost while ensuring the quality of the electric energy, and maximizing the capacity redundancy of the power supply in the operation process.
In some alternative embodiments, the operating conditions of hydrogen production system 120 include a start-stop condition and a surge condition, and controller 130 is configured to:
under the condition that the generated power is detected to be gradually increased from zero to first power, and the increased time length is kept to be greater than or equal to a first preset time length, determining that the hydrogen production system 120 is in a start-stop state; and the number of the first and second groups,
when it is detected that the generated power is gradually reduced from the maximum generated power of the renewable energy power generation system 110 to a second power, and the reduction duration is kept to be greater than or equal to a second preset duration, determining that the hydrogen production system 120 is in a start-stop state;
determining that the hydrogen production system 120 is in a fluctuating state in the case of detecting that the generated power gradually increases from zero to a first power and keeping the increasing time period less than the first preset time period, or in the case of detecting that the generated power starts to increase from a third power to a fourth power;
determining that the hydrogen production system 120 is in a fluctuating state in the case where it is detected that the generated power is gradually reduced from the maximum generated power of the renewable energy power generation system 110 to the second power for a period of time less than the second preset period of time, or in the case where it is detected that the generated power is reduced from the fifth power to the sixth power;
wherein the third power is greater than zero and the fifth power is less than the maximum generated power.
The specific magnitudes of the first power, the second power, the third power, the fourth power, the fifth power and the sixth power, and the specific duration of the preset duration are not limited in the present disclosure, for example, the preset duration may be 10 minutes, 15 minutes or 20 minutes, the first power may be any power value greater than zero, less than or equal to the maximum generated power, the second power may be any power value less than the maximum generated power, greater than or equal to zero, and the like.
It is to be understood that the increase from the third power to the fourth power may be from the third power to the fourth power after the third power is maintained for a certain period of time, or the generated power may start to increase after the generated power gradually decreases to the third power. The reduction from the fifth power to the sixth power may be performed by starting to reduce the generated power from the fifth power to the sixth power after the generated power is maintained at the fifth power for a certain period of time, or may be performed by starting to reduce the generated power after the generated power is increased to the fifth power.
That is, when the generated power rises from zero and the electric quantity falls from the highest value, and both the generated power and the electric quantity are maintained for a long operation time (for example, higher than 20 min), the state is determined as the start-stop state, and a control scheme corresponding to the start-stop state can be executed; when the generated power rises from zero or falls from the highest value within a short time (for example, less than 20 min), or the starting point of the generated power starting to rise is not zero, or the starting point of the generated power starting to fall is not the maximum generated power, the state is judged to be a fluctuation state, and a control scheme corresponding to the fluctuation state is executed.
By adopting the scheme, in order to adapt to the power generation characteristics of the renewable energy source, the system control method is divided into a start-stop state and a fluctuation state, the increase or decrease of the power generation is detected by the controller 130, the current working mode of the hydrogen production system 120 is accurately determined according to the change condition of the power generation, the hydrogen production system 120 is controlled based on different working modes, and the robustness of the control of the working mode of the hydrogen production system 120 is effectively ensured.
In some optional embodiments, the controller 130 is configured to:
and under the condition that the hydrogen production system 120 is determined to be in a start-stop state, controlling the main power supply circuit to be in a first working mode, and controlling the plurality of electrolytic cells 122 to be started one by one or controlling the plurality of electrolytic cells 122 to be stopped one by one according to the generated power.
Wherein, the hydrogen production system 120 is in a start-stop state, that is, under the condition that the hydrogen production system 120 keeps decreasing or increasing from the highest generated power or zero, the main circuit of the power supply is controlled to work in a forward direction (that is, in a first working mode), so as to realize a rectification function, and supply power to the hydrogen production electrolytic cell 122.
And, the opening or closing of the electrolytic bath 122 is sequentially controlled according to the current actual magnitude of the generated power.
By adopting the above scheme, under the condition that the hydrogen production system 120 is determined to be in the on-off state, the main circuit of the hydrogen production power supply 121 is controlled to work in the forward direction to rectify power to supply power to the hydrogen production electrolytic tank 122, and the on-off state of the electrolytic tank 122 is sequentially controlled according to the generated power, so that the generated power of renewable energy sources and the margin of the hydrogen production power supply 121 can be more fully utilized.
In other alternative embodiments, the controller 130 is configured to:
under the condition that the hydrogen production system 120 is determined to be in a fluctuation state, if the generated power is increased, controlling the main power supply circuit to be in the first working mode;
under the condition that the hydrogen production system 120 is determined to be in a fluctuation state, if the generated power is reduced and is greater than a preset fluctuation threshold value, controlling the main power supply circuit to be in the first working mode;
and under the condition that the hydrogen production system 120 is determined to be in a fluctuation state, if the generated power is reduced to be less than or equal to the preset fluctuation threshold value and a preset switching condition is met, controlling the main power supply circuit to be in the second working mode.
The preset switching conditions may include that all of the electrolysis cells 122 have been safely shut down and do not require power.
Illustratively, the preset fluctuation threshold may be, for example, 30% of the rated power of the electrolyzer 122, for example, if the rated power of the electrolyzer 122 is P, the generated power drops to 40% P, and all the electrolyzers 122 are stopped, the main power circuit of the power supply may be controlled to be in the second operation mode, so as to invert the redundant electric energy in the hydrogen-producing power supply 121 except for supplying power to the electrolyzer to output reactive current for reactive power compensation.
In some possible embodiments, the controller 130 may be further configured to: and controlling the main power supply circuit to be in a first working mode under the condition that the generated power is detected to be larger than seventh power. The seventh power may be equal to or close to the full power of the renewable energy power generation system. That is, when the renewable energy power generation system is detected to be in the full-power state, the power main circuit can be directly controlled to be in the first working mode so as to supply power to the electrolytic cell.
Furthermore, in other possible embodiments, it may be further determined whether it is necessary to switch the power main circuit to the first operation mode or the second operation mode in a case where it is determined that the generated power is less than the seventh power.
By adopting the scheme, under the condition that the hydrogen production system 120 is determined to be in the fluctuation state, if the generated power is increased or reduced in a small amplitude, the main power circuit is kept in the rectification state to provide electric energy for each electrolytic cell 122, when the generated power fluctuates to the preset fluctuation threshold value, whether the preset switching condition is met or not is judged, and the main power circuit is controlled to be switched from the first working mode to the second working mode after the preset switching condition is met, so that the reactive compensation function is realized.
In some examples, the controller 130 is to:
under the condition that the main power supply circuit is in the second working mode, determining a reactive compensation current value according to the active power and the reactive power of the grid-connected point of the hydrogen production system 120;
and sending the reactive compensation current value to the hydrogen production power supply 121, so that the hydrogen production power supply 121 performs reactive compensation according to the reactive compensation current value.
By adopting the scheme, the controller 130 detects the active power and the reactive power of the grid-connected point to determine the reactive compensation current value and sends the reactive compensation current value to the hydrogen production power supply 121, so that the hydrogen production power supply 121 generates the reactive current according to the reactive current value fed back by the controller 130 to perform reactive compensation, on the basis of adapting to the randomness and the volatility of the renewable energy sources, the renewable energy sources of the hydrogen production power supply 121 allowance are effectively utilized to perform reactive compensation control, and the cost is effectively reduced.
In some embodiments, said controlling said plurality of electrolysis cells 122 to be turned on one by one according to said generated power comprises:
determining the total value of the power rating of the activated cells 122;
and under the condition that the difference value between the generated power and the total value is greater than the minimum starting power of the electrolytic cell 122, controlling the next electrolytic cell 122 to be opened until the generated power reaches the first power.
The minimum starting power Ps may be a pre-calibrated value, for example, 40% P, 50% P, or 60% P, etc., which is not specifically limited in this disclosure.
Specifically, when the generated power is greater than the minimum starting power Ps of the first electrolytic tank 122, the first electrolytic tank 122 is opened; then when the generated power continues to increase and exceeds the rated power P of the first electrolytic tank 122 and exceeds the minimum starting power Ps of the second electrolytic tank 122, the second electrolytic tank 122 is started; and so on until all cells 122 are activated.
Through the scheme, the opening of the electrolytic cells 122 can be effectively and sequentially controlled by determining the difference between the sum of the rated power of the started electrolytic cells 122 and the generated power, the working power of each electrolytic cell 122 can be effectively ensured to be kept in a certain range, and the service life of the electrolytic cells 122 is prolonged.
In other embodiments, controlling the plurality of electrolysis cells 122 to shut down on a case-by-case basis based on the generated power comprises:
determining the total value of the rated power of N-1 electrolytic cells 122, wherein N is the number of the currently started electrolytic cells 122;
and under the condition that the difference value between the generated power and the total value is less than the minimum starting power of the electrolytic cell 122, controlling the Nth electrolytic cell 122 to stop the machine until the generated power reaches the second power.
Specifically, when the generated power is greater than the rated power (N-1) P of the N-1 electrolytic cells 122 and less than the minimum starting power Ps of the Nth electrolytic cell 122, the Nth electrolytic cell 122 is stopped, and so on until all the electrolytic cells 122 are stopped.
By adopting the scheme, the shutdown of the electrolytic cells 122 can be effectively and sequentially controlled by determining the number of the started electrolytic cells minus the difference between the sum of the rated power of the electrolytic cells and the generated power, the working power of the electrolytic cells 122 can be effectively ensured to be kept in a certain range, and the service life of the electrolytic cells 122 is prolonged.
Optionally, the controller 130 is further configured to:
the power difference between the generated power and the total value of the rated power of the activated electrolytic cell 122 is evenly distributed to the activated electrolytic cells 122.
By adopting the scheme, the power difference value between the generated power and the total value of the rated power of the started electrolytic cell is evenly distributed to the started electrolytic cell, so that the electric energy can be effectively utilized, the working power of each electrolytic cell 122 can be ensured to be still kept in a certain range, and the service life of the electrolytic cell 122 is effectively ensured.
Based on the same inventive concept, fig. 2 is a flowchart illustrating a method for controlling a renewable energy hydrogen production system according to an exemplary embodiment, which may be applied to the renewable energy hydrogen production system shown in fig. 1, and in particular, to the controller 130 shown in fig. 1, as shown in fig. 2, the method including:
s201, detecting the power generation power of the renewable energy power generation system and the active power and the reactive power of the grid-connected point of the hydrogen production system.
S202, controlling the working state of the hydrogen production system and the working mode of the main circuit of the power supply according to the generated power, the active power of the grid-connected point and the reactive power.
Optionally, the operating state of the hydrogen production system includes a start-stop state and a fluctuation state, and the operating state of the hydrogen production system controlled according to the generated power, the active power of the grid-connected point, and the reactive power includes:
under the conditions that the generated power is gradually increased from zero to the first power and the increased duration is greater than or equal to a first preset duration, determining that the hydrogen production system is in a start-stop state; and (c) a second step of,
when the situation that the generated power is gradually reduced to second power from the maximum generated power of the renewable energy power generation system and the reduction duration is greater than or equal to a second preset duration is detected, determining that the hydrogen production system is in a start-stop state;
under the condition that the generated power is detected to be gradually increased from zero to the first power and the increasing duration is kept to be less than a first preset duration, or under the condition that the generated power is detected to be increased from the third power to the fourth power, the hydrogen production system is determined to be in a fluctuation state;
under the condition that the generated power is detected to be gradually reduced from the maximum generated power of the renewable energy power generation system to the second power and the reduction duration is less than a second preset duration, or under the condition that the generated power is detected to be reduced from the fifth power to the sixth power, the hydrogen production system is determined to be in a fluctuation state;
and the third power is greater than zero, and the fifth power is less than the maximum generated power.
Optionally, controlling the operating state of the hydrogen production system according to the generated power, the active power of the grid-connected point and the reactive power, and the operating mode of the main circuit of the power supply comprises:
and under the condition that the hydrogen production system is determined to be in a start-stop state, controlling the main circuit of the power supply to be in a first working mode, and controlling the plurality of electrolytic cells to be started one by one or controlling the plurality of electrolytic cells to be stopped one by one according to the power generation power.
Optionally, the controlling the operating state of the hydrogen production system according to the generated power, the active power of the grid-connected point and the reactive power, and the operating mode of the main circuit of the power supply comprises:
under the condition that the hydrogen production system is determined to be in a fluctuation state, if the generated power is increased, controlling the main circuit of the power supply to be in a first working mode;
under the condition that the hydrogen production system is determined to be in a fluctuation state, if the generated power is reduced and is greater than a preset fluctuation threshold value, controlling a main circuit of a power supply to be in a first working mode;
and under the condition that the hydrogen production system is determined to be in a fluctuation state, if the generated power is reduced to be less than or equal to a preset fluctuation threshold value and a preset switching condition is met, controlling the main circuit of the power supply to be in a second working mode.
Optionally, controlling the operating state of the hydrogen production system according to the generated power, the active power of the grid-connected point and the reactive power, and the operating mode of the main circuit of the power supply comprises:
under the condition that the main circuit of the power supply is in a second working mode, determining a reactive compensation current value according to the active power and the reactive power of the grid-connected point of the hydrogen production system;
and sending the reactive compensation current value to the hydrogen production power supply so that the hydrogen production power supply performs reactive compensation according to the reactive compensation current value.
Optionally, the controlling the plurality of electrolysis cells to be opened one by one according to the power generation power comprises:
determining the total value of the rated power of the started electrolytic cell;
and controlling the next electrolytic tank to be opened under the condition that the difference value between the generated power and the total value is greater than the minimum starting power of the electrolytic tank until the generated power reaches the first power.
Optionally, controlling the plurality of electrolysis cells to be shut down one by one according to the power generation power comprises:
determining the total value of the rated power of N-1 electrolytic cells, wherein N is the number of the currently started electrolytic cells;
and under the condition that the difference value between the generated power and the total value is less than the minimum starting power of the electrolytic cell, controlling the Nth electrolytic cell to stop until the generated power reaches the second power.
Optionally, controlling the operating state of the hydrogen production system according to the generated power, the active power of the grid-connected point and the reactive power, and the operating mode of the main circuit of the power supply comprises:
the power difference between the generated power and the total value of the rated power of the started electrolytic cell is evenly distributed to the started electrolytic cell.
In order to make those skilled in the art understand the technical solutions provided by the present disclosure, the present disclosure further provides a flowchart of a method for determining an operating state of a hydrogen production system according to an exemplary embodiment as shown in fig. 3, where as shown in fig. 3, the method includes:
s301, judging whether the generated power is increased from 0.
In a case where it is determined that the generated power is increased from 0, step S303 is executed; in a case where it is determined that the generated power does not rise from 0, step S302 is executed.
S302, judging whether the generated power is reduced from the maximum generated power.
In a case where it is determined that the generated power is decreased from the maximum generated power, step S303 is executed; in the case where it is determined that the generated power does not decrease from the maximum generated power, step S304 is executed.
S303, judging whether the time length for which the generated power keeps increasing or decreasing is greater than a preset time length threshold value T.
In the case where it is determined that the period of time for which the generated power remains increased or decreased is greater than T, step S305 is executed; in the case where it is determined that the period of time for which the generated power remains increased or decreased is less than or equal to T, step S304 is executed.
And S304, determining that the hydrogen production system is in a fluctuation state.
S305, determining that the hydrogen production system is in a start-stop state.
It is to be understood that the execution sequence of the steps S301 and S302 may be to execute the step S302 first and then execute the step S301, and the disclosure is not limited thereto. The time period T may be, for example, 20 minutes, 30 minutes, or the like.
FIG. 4 is a flow chart illustrating a method for controlling a surge condition in accordance with an exemplary embodiment, wherein the following steps are performed upon determining that the hydrogen production system is in a surge condition, as shown in FIG. 4, the method comprising the steps of:
and S401, judging whether the generated power floats.
In the case where it is determined that the generated power floats, step S402 is executed; in the case where it is determined that the generated power is floating, step S403 is executed.
S402, uniformly distributing the floating power to the started electrolytic cell.
Wherein, the step S402 may be executed when the power main circuit is in the first operation mode.
And S403, judging whether the generated power floats to a preset fluctuation threshold Pt.
The preset fluctuation threshold Pt may be, for example, 30% P, i.e., 30% rated power.
In the case where it is determined that the generated power is greater than or equal to the preset fluctuation threshold value Pt, step S404 is executed and in the case where it is determined that the generated power is less than the preset fluctuation threshold value Pt, step S405 is executed.
And S404, controlling a main circuit of the power supply in the hydrogen production power supply to be in a first working mode.
If the power main circuit is originally in the first working mode, the power main circuit can be kept in the first working mode.
S405, judging whether a preset switching condition is met.
The preset switching conditions may include that all of the cells 122 have been safely shut down and do not require power.
In the case where the preset switching condition is satisfied, steps S406 to S408 are performed.
And S406, switching a main power supply circuit in the hydrogen production power supply to a second working mode.
And S407, determining a reactive compensation current value according to the active power and the reactive power of the grid-connected point of the hydrogen production system.
And S408, sending the reactive compensation current value to the hydrogen production power supply so that the hydrogen production power supply performs reactive compensation according to the reactive compensation current value.
It is understood that in step S408, the hydrogen-producing power supply may also be rectified to supply power to one or more electrolysis cells while performing reactive power compensation.
The main body of execution of the flow diagrams shown in fig. 2-4 described above may be controller 130 in the renewable energy hydrogen production system shown in fig. 1. Or other electronic devices.
Fig. 5 is a block diagram illustrating an electronic device 500 in accordance with an example embodiment. As shown in fig. 5, the electronic device 500 may include: a processor 501 and a memory 502. The electronic device 500 may also include one or more of a multimedia component 503, an input/output (I/O) interface 504, and a communication component 505. The electronic device 500 may be provided as the controller 130 in the renewable energy hydrogen generation system shown in fig. 1.
The processor 501 is configured to control the overall operation of the electronic device 500, so as to complete all or part of the steps in the control method of the renewable energy hydrogen production system. The memory 502 is used to store various types of data to support operations at the electronic device 500, which may include, for example, instructions for any application or method operating on the electronic device 500, as well as application-related data, such as generated power, reactive power, number of activated electrolysis cells, and so forth. The Memory 502 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically Erasable Programmable Read-Only Memory (EEPROM), erasable Programmable Read-Only Memory (EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk. The multimedia component 503 may include a screen and an audio component. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving an external audio signal. The received audio signal may further be stored in the memory 502 or transmitted through the communication component 505. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 504 provides an interface between the processor 501 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 505 is used for wired or wireless communication between the electronic device 500 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, near Field Communication (NFC for short), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, which is not limited herein. The corresponding communication component 505 may thus comprise: wi-Fi modules, bluetooth modules, NFC modules, and the like.
In an exemplary embodiment, the electronic Device 500 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for executing the above-mentioned control method of the renewable energy hydrogen production system.
In another exemplary embodiment, a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the control method for a renewable energy hydrogen production system described above is also provided. For example, the computer readable storage medium may be the memory 502 described above that includes program instructions that are executable by the processor 501 of the electronic device 500 to perform the method for controlling a renewable energy hydrogen generation system described above.
In another exemplary embodiment, a computer program product is also provided, which comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-described control method of a renewable energy hydrogen production system when executed by the programmable apparatus.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. The renewable energy hydrogen production system is characterized by comprising a renewable energy power generation system, a hydrogen production system and a controller, wherein the renewable energy power generation system, the hydrogen production system and the controller are connected through a bus and are connected to a public power grid through a transformer substation;
the hydrogen production system comprises a hydrogen production power supply and one or more electrolysis baths;
the power supply main circuit in the hydrogen production power supply is used for rectifying the three-phase alternating current of the bus to supply power to the one or more electrolytic cells under the condition that the power supply main circuit is in a first working mode; the main circuit of the power supply is used for rectifying the three-phase alternating current of the bus to supply power to the one or more electrolytic cells and inverting and outputting redundant electric energy to reactive current to realize reactive compensation under the condition that the main circuit of the power supply is in a second working mode;
the controller is used for detecting the power generation power of the renewable energy power generation system and the active power and the reactive power of the grid-connected point of the hydrogen production system; and controlling the working state of the hydrogen production system and the working mode of the main circuit of the power supply according to the generated power, the active power and the reactive power of the grid-connected point.
2. The system for renewable energy hydrogen production of claim 1 wherein the operating conditions of the hydrogen production system include a start-stop condition and a surge condition, the controller being configured to:
under the condition that the generated power is detected to be gradually increased from zero to first power and the increased time is kept to be greater than or equal to a first preset time, determining that the hydrogen production system is in a start-stop state; and the number of the first and second groups,
under the condition that the generated power is detected to be gradually reduced from the maximum generated power of the renewable energy power generation system to second power, and the reduction duration is kept to be greater than or equal to second preset duration, determining that the hydrogen production system is in a start-stop state;
under the condition that the generated power is detected to gradually increase from zero to first power and the increased time is kept to be less than the first preset time, or under the condition that the generated power is detected to start to increase from third power to fourth power, the hydrogen production system is determined to be in a fluctuation state;
under the condition that the generated power is detected to be gradually reduced from the maximum generated power of the renewable energy power generation system to the second power and the reduction duration is kept less than the second preset duration, or under the condition that the generated power is detected to be reduced from the fifth power to the sixth power, determining that the hydrogen production system is in a fluctuation state;
wherein the third power is greater than zero and the fifth power is less than the maximum generated power.
3. The system for renewable energy hydrogen production according to claim 2 wherein the controller is configured to:
and under the condition that the hydrogen production system is determined to be in a start-stop state, controlling the main power supply circuit to be in a first working mode, and controlling the plurality of electrolytic cells to be started one by one or controlling the plurality of electrolytic cells to be stopped one by one according to the generated power.
4. The system for renewable energy hydrogen production according to claim 2 wherein the controller is configured to:
under the condition that the hydrogen production system is determined to be in a fluctuation state, if the generated power is increased, controlling the main power supply circuit to be in the first working mode;
under the condition that the hydrogen production system is determined to be in a fluctuation state, if the generated power is reduced and is larger than a preset fluctuation threshold value, controlling the main power supply circuit to be in the first working mode;
and under the condition that the hydrogen production system is determined to be in a fluctuation state, if the generated power is reduced to be less than or equal to the preset fluctuation threshold value and meets the preset switching condition, controlling the main power supply circuit to be in the second working mode.
5. The system for renewable energy hydrogen production according to claim 1 wherein the controller is configured to:
under the condition that the main power supply circuit is in the second working mode, determining a reactive compensation current value according to the active power and the reactive power of the grid-connected point of the hydrogen production system;
and sending the reactive compensation current value to the hydrogen production power supply so that the hydrogen production power supply carries out reactive compensation according to the reactive compensation current value.
6. The system for renewable energy hydrogen production according to claim 3 wherein said controlling said plurality of electrolysis cells to be turned on one by one based on said generated power comprises:
determining the total value of the rated power of the started electrolytic cell;
and controlling the next electrolytic tank to be opened under the condition that the difference value between the generated power and the total value is greater than the minimum starting power of the electrolytic tank until the generated power reaches the first power.
7. The system for renewable energy hydrogen production according to claim 3 wherein controlling the plurality of electrolysis cells to shut down one by one based on the generated power comprises:
determining the total value of the rated power of N-1 electrolytic cells, wherein N is the number of the currently started electrolytic cells;
and under the condition that the difference value between the generated power and the total value is smaller than the minimum starting power of the electrolytic cell, controlling the Nth electrolytic cell to stop until the generated power reaches the second power.
8. The system for renewable energy hydrogen production according to any one of claims 1-7, wherein the controller is further configured to:
and evenly distributing the power difference value of the generated power and the total value of rated power of the started electrolytic cell to the started electrolytic cell.
9. A method for controlling a renewable energy hydrogen production system, which is applied to the renewable energy hydrogen production system according to any one of claims 1 to 8, the method comprising:
detecting the power generation power of the renewable energy power generation system and the active power and the reactive power of a grid-connected point of the hydrogen production system;
and controlling the working state of the hydrogen production system and the working mode of the main circuit of the power supply according to the generated power, the active power and the reactive power of the grid-connected point.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method as claimed in claim 9.
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