SOFC power generation system and control method thereof, and fuel cell controller

Abstract

The invention discloses an SOFC power generation system, a control method thereof and a fuel cell controller, the SOFC power generation system comprises a power generation module and a cold and heat supply module, and the method comprises the following steps: under the condition that the current electricity price is the valley electricity price, controlling the power generation module to reduce the generated power to zero, and switching a currently adopted first fuel into a second fuel; the economic cost of the first fuel is higher than that of the second fuel; the current fuel component introduced into the power generation module is obtained, and the first flow value of the second fuel is adjusted according to the current fuel component, so that the power generation module is kept running at zero power; and the air flow and the tail gas temperature in the power generation module are obtained, and the second flow value of the second fuel is adjusted according to the air flow and the tail gas temperature, so that cold / heat supply of the cold and heat supply module is kept. The running cost of the SOFC power generation system can be reduced in the off-peak electricity period, so that the economic benefit of the SOFC power generation system is improved.

Description

Technical Field

[0001] The present application relates to the field of battery power generation, and specifically to a SOFC power generation system and a control method thereof, and a fuel cell controller. Background Art

[0002] SOFC (Solid Oxide Fuel Cell system) power generation system is a highly efficient power generation device with the characteristics of high power generation efficiency and diversified fuels. Its fuel can be natural gas, hydrogen, biogas, biomass gas and other compounds containing C (carbon) and H (hydrogen).

[0003] Although the SOFC power generation system has many advantages, it also has obvious disadvantages, such as long start-up and shutdown time, and limited start-up and shutdown times. Therefore, the SOFC system is more suitable for long-term continuous power generation or combined heat and power scenarios, such as hotels and hospitals with continuous electricity, heat, and cooling needs. The power supply of the power grid can be divided into three electricity price periods: parity, peak price, and valley price. They can also be called flat power period, peak power period, and valley power period. Generally, the valley power period is 5 consecutive hours, and the rest are flat power period and peak power period. During the valley power period, if the SOFC power generation system also uses natural gas to generate electricity, the cost will be higher than the power grid price, and the economic benefit will be negative. However, the SOFC system is limited by factors such as long start-up and shutdown time, and cannot be shut down during the valley power period. Therefore, how to reduce the operating cost of the existing SOFC power generation system and improve the economic benefits of the SOFC power generation system is an urgent problem to be solved.

[0004] It should be noted that the above statements are only used to provide background technical information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0005] In view of the above problems, the embodiments of the present application provide a SOFC power generation system and a control method thereof, and a fuel cell controller, which can reduce the operating cost of the SOFC power generation system during off-peak hours, thereby improving the economic benefits of the SOFC power generation system.

[0006] In a first aspect, an embodiment of the present application provides a method for controlling a SOFC power generation system, wherein the SOFC power generation system includes a power generation module and a cold and hot supply module, and the method includes:

[0007] When the current electricity price is a valley electricity price, the power generation module is controlled to reduce the power generation to zero, and the first fuel currently used is switched to a second fuel; the economic cost of the first fuel is higher than the economic cost of the second fuel;

[0008] Acquire the current fuel composition flowing into the power generation module, and adjust the first flow value of the second fuel according to the current fuel composition to keep the power generation module running at zero power;

[0009] The air flow and the exhaust gas temperature in the power generation module are obtained, and the second flow value of the second fuel is adjusted according to the air flow and the exhaust gas temperature to keep the cold / hot supply module performing cold / hot supply.

[0010] In some optional embodiments, the method further includes:

[0011] When the current electricity price changes from the valley electricity price to the non-valley electricity price, switching the second fuel currently used to the first fuel;

[0012] The flow rate of the first fuel is controlled to increase the power generation of the power generation module from zero power to target power.

[0013] In some optional embodiments, obtaining the current fuel composition passed into the power generation module includes:

[0014] Acquire real-time detection data of a gas composition detector; the gas composition detector is arranged on the air intake passage of the power generation module, and is used to detect the composition of the second fuel in the fuel passing into the power generation module in real time;

[0015] The current fuel composition entering the power generation module is determined based on the real-time detection data.

[0016] In some optional embodiments, the second fuel is a renewable energy source that can be used for battery power generation.

[0017] In a second aspect, an embodiment of the present application provides a fuel cell controller, characterized in that it is applied to a SOFC power generation system including a power generation module and a cold and hot supply module, and the fuel cell controller includes:

[0018] A fuel switching module, used for controlling the power generation module to reduce the power generation to zero and switch the first fuel currently used to a second fuel when the current electricity price is a valley electricity price; the economic cost of the first fuel is higher than the economic cost of the second fuel;

[0019] a first adjustment module, configured to obtain a current fuel composition of the second fuel, and adjust a first flow value of the second fuel according to the current fuel composition, so as to keep the power generation module operating at zero power;

[0020] The second adjustment module is used to obtain the air flow and exhaust gas temperature in the power generation module, and adjust the second flow value of the second fuel according to the air flow and the exhaust gas temperature to maintain the cold / hot supply module.

[0021] In a third aspect, an embodiment of the present application provides a SOFC power generation system, characterized in that it includes a power generation module, a fuel supply module, a cold and hot supply module, and the fuel cell controller as described in claim 5.

[0022] In some optional embodiments, the fuel supply module includes a fuel gas circuit and a fuel switching controller, the fuel gas circuit is used to provide the first fuel and the second fuel; the fuel switching controller is used to control the on-off of the fuel gas circuit that provides fuel to the power generation module.

[0023] In some optional embodiments, the fuel supply module also includes a gas composition detector, which is arranged on the air intake passage of the power generation module, and is used to detect the composition of the second fuel in the fuel entering the power generation module in real time, and send the detection result to the fuel cell controller.

[0024] In some optional embodiments, the cold and hot supply module is connected to the fuel supply module and the power generation module, and is respectively connected to the second fuel and the high-temperature exhaust gas of the power generation module.

[0025] In some optional embodiments, the SOFC power generation system further includes a cloud platform, which is connected to the fuel cell controller via a bus protocol and sends the current electricity price to the fuel cell controller.

[0026] In the present application, when the current electricity price is the valley electricity price, the power generation module can be controlled to reduce the power generation to zero. When the power generation module is running at zero power, the first fuel with higher economic cost and carbon emission is switched to the second fuel with lower economic cost and carbon emission. And the flow rate of the second fuel introduced into the power generation module is continuously adjusted to keep the power generation module running normally at zero power. The above-mentioned second fuel can also be introduced into the cold and heat supply module, and the flow rate of the second fuel introduced into the cold and heat supply module is adjusted in real time to keep the cold and heat supply module for normal cold / heat supply. In this way, by switching between the two fuels, when the current electricity price is the valley electricity price, the economic cost and carbon emissions of the SOFC power generation system can be reduced while ensuring that the SOFC power generation system does not stop (the power generation module runs at zero power).

[0027] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation method of the present application is listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 A flow chart of a SOFC power generation system control method provided in some embodiments of the present application;

[0030] Figure 2 A schematic diagram of the framework structure of a SOFC power generation system provided in some embodiments of the present application;

[0031] Figure 3 A schematic diagram of the framework structure of a fuel supply module in a SOFC power generation system provided in some embodiments of the present application;

[0032] Figure 4 This is a specific flow chart of step S2 in some embodiments of the present application;

[0033] Figure 5 A schematic diagram of a specific flow chart of a SOFC power generation system control method provided in some embodiments of the present application;

[0034] Figure 6 A schematic diagram of the framework of a master control device for a SOFC power generation system provided in some embodiments of the present application;

[0035] Figure 7 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the embodiments of the present application; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of the present application, “plurality” means more than two, unless otherwise clearly and specifically defined.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] Some relevant terms involved in this embodiment are explained below.

[0042] SOFC (Solid Oxide Fuel Cell), solid oxide fuel cell, is a fully solid-state fuel cell that uses solid oxide as electrolyte. It directly converts the chemical energy in the fuel into electrical energy through electrochemical reactions. In SOFC, oxygen molecules are reduced to oxygen ions by obtaining electrons at the cathode. The oxygen ions transit to the anode through the oxygen vacancies in the electrolyte layer and undergo oxidation reactions with the fuel (such as natural gas, hydrogen, etc.). It is mainly used in portable power supplies, distributed power generation / cogeneration systems, high-performance power supplies, large power stations and other fields.

[0043] Renewable energy refers to sustainable resources from nature, such as solar energy, wind energy, geothermal energy, biomass energy, etc. These energies will not be exhausted during human use, so they are called renewable energy. Among them, biomass energy can include biomass gas and biogas.

[0044] Biomass gas usually refers to the gas produced by the biomass gasification process. Biomass gasification is a thermochemical process. Its biomass raw materials can include wood, crop residues, forestry waste, etc. Biomass gas is the synthesis gas of combustible gases such as CO (carbon monoxide), H2 (hydrogen) and low molecular hydrocarbons and non-combustible gases such as CO2 (carbon dioxide) decomposed from biomass raw materials under high temperature and oxygen-deficient (non-combustion state) conditions.

[0045] Biogas is produced through anaerobic digestion, which is the gas produced by the decomposition of organic matter by microorganisms under oxygen-free conditions. Its main components are methane (CH4) and carbon dioxide (CO2). Its biomass raw materials can include organic waste such as human and animal feces, crop residues, and food processing waste.

[0046] In the related technologies, most SOFC power generation systems directly use natural gas as fuel, and use natural gas to generate electricity regardless of whether it is during normal power periods, peak power periods, or valley power periods. Due to the high cost of natural gas, the cost may be higher than the power price of the power grid during valley power periods, thereby reducing the overall economic benefits of the SOFC power generation system.

[0047] Based on the above reasons, the embodiment of the present application proposes a control method for a SOFC power generation system, which can be applied to a SOFC power generation system including a power generation module and a cold and hot supply module, and can be specifically executed by a fuel cell system controller (Fuel-cell Control Unit, FCU) of the SOFC power generation system. In the method, when the current electricity price is a valley electricity price, the power generation module is controlled to reduce the power generation to zero, and the first fuel currently used is switched to a second fuel with a lower economic cost; then the first flow value of the second fuel is adjusted according to the current fuel composition passed into the power generation module to keep the power generation module running at zero power; and the second flow value of the second fuel is adjusted according to the air flow and exhaust gas temperature in the power generation module to keep the cold and hot supply module for cold / hot supply. In this way, when the current electricity price is a valley electricity price, on the one hand, the power generation module is controlled to reduce the power generation to zero, and when the power generation module is running at zero power, the first fuel with higher economic cost and carbon emission is switched to the second fuel with lower economic cost and carbon emission. And the flow of the second fuel passed into the power generation module is continuously adjusted to keep the power generation module running normally at zero power. On the other hand, the second fuel is also introduced into the cold and hot supply module, and the flow of the second fuel introduced into the cold and hot supply module is adjusted in real time to keep the cold and hot supply module performing normal cold / hot supply. In this way, by switching between the two fuels, when the current electricity price is the valley electricity price, the economic cost and carbon emissions of the SOFC power generation system can be reduced while ensuring that the SOFC power generation system does not stop (the power generation module operates at zero power).

[0048] The following is a detailed description of the SOFC power generation system control method provided by the embodiment of the present application in conjunction with the accompanying drawings. Figure 1 , Figure 1 A flow chart of a control method for a SOFC power generation system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the SOFC power generation system control method may include the following steps:

[0049] Step S1, when the current electricity price is a valley electricity price, control the power generation module to reduce the power generation to zero, and switch the currently used first fuel to the second fuel;

[0050] Step S2, obtaining the current fuel composition entering the power generation module, and adjusting the first flow value of the second fuel according to the current fuel composition to keep the power generation module running at zero power;

[0051] Step S3, obtaining the air flow and exhaust gas temperature in the power generation module, and adjusting the second flow value of the second fuel according to the air flow and exhaust gas temperature to keep the cold / hot supply module performing cold / hot supply.

[0052] Among them, the power generation efficiency and economic cost of the first fuel are higher than those of the second fuel. For example, the first fuel can be natural gas, hydrogen, etc. The second fuel can be a fuel with lower cost than natural gas and hydrogen, such as renewable energy gases such as biomass gas and marsh gas, which can not only reduce the cost of power generation, but also reduce carbon emissions, and be more environmentally friendly. The above-mentioned first flow value is the flow value of the second fuel passed into the power generation module, and the second flow value is the flow value of the second fuel passed into the power generation module. In addition, the first fuel and the second fuel can be single fuels or mixed fuels, and this embodiment does not make specific limitations on this.

[0053] In actual applications, after the first fuel is switched to the second fuel, the power generation module will have both the first fuel and the second fuel for a period of time, that is, the switching of the power generation module from the first fuel to the second fuel is a process change, not a sudden change. In this process, the flow rate of the first fuel gradually changes from the flow rate value at non-valley electricity prices to zero, while the flow rate of the second fuel changes from zero to the target flow rate value at valley electricity prices. Therefore, the current fuel composition of the power generation module can be understood as the respective components of the first fuel and the second fuel. If the first fuel and / or the second fuel is a mixed fuel, the components of each fuel in the mixed fuel can also be included here.

[0054] Specifically, the structure of the above-mentioned SOFC power generation system can be as follows: Figure 2As shown, it includes a fuel cell system controller (Fuel-cell Control Unit, FCU), a fuel supply module, a power generation module, and a cold and hot supply module. Among them, the fuel supply module can integrate the supply of multiple different fuels to provide an appropriate amount of clean gas to the power generation module and / or the cold and hot supply module. And the fuel supply module can also include a fuel gas circuit and a fuel switching controller, the fuel gas circuit is used to provide a clean first fuel and a second fuel; the fuel switching controller is used to control the on and off of the fuel gas circuit that provides fuel to the power generation module. The fuel cell system controller can calculate the blending ratio of multiple fuels according to the changes in the gas source components, and then adjust the fuel flow value entering the power generation module and / or the cold and hot supply module. The cold and hot supply module is used to provide cooling or heating to cold / hot equipment or places.

[0055] It should be noted that the specific structure of the above-mentioned SOFC power generation system and its fuel supply module indicates an implementation mode of this embodiment, and this embodiment is not limited thereto, as long as the fuel cell system controller can implement the above-mentioned SOFC power generation system control method.

[0056] In some optional embodiments, such as Figure 3 As shown, the fuel supply module of the SOFC power generation system may also include a gas composition detector, which may be arranged on the air inlet passage of the power generation module, for real-time detection of the composition of the second fuel in the fuel entering the power generation module, and sending the detection result to the fuel cell controller. Accordingly, the above-mentioned step of obtaining the current fuel composition entering the power generation module may include the following specific processing procedures: obtaining real-time detection data of the gas composition detector; determining the current fuel composition entering the power generation module based on the real-time detection data.

[0057] It is understandable that the present embodiment does not specifically limit the specific structure of the gas composition detector, as long as it is installed on the air intake passage of the power generation module and can detect the fuel composition entering the power generation module in real time. When the fuel components entering the power generation module include only one or two, it can detect only one fuel component, and then based on the known fuel type and the composition of one of the fuels, it can calculate the composition of each of the two fuels. Of course, the gas composition detector can also be more advanced to detect the composition of each fuel in all the fuels entering the power generation module, so that the composition value of each fuel can be directly obtained without calculation, thereby improving the control sensitivity and the working efficiency of the power generation system.

[0058] In this embodiment, a gas composition detector can be set on the air inlet passage of the power generation module to detect the composition of the second fuel in the fuel entering the power generation module, that is, the proportion of the second fuel in all the fuel gases in the power generation module. Then, according to the respective proportions of the first fuel and the second fuel, it can be calculated whether the fuel currently entering the power generation module can keep the power generation module running at zero power without stopping. And according to the calculation results, the proportion coefficient of the second fuel can be adjusted to keep the power generation module running at zero power. Specifically, since the first fuel will become less and less during the fuel switching process, it is necessary to increase the composition coefficient of the second fuel to keep the power generation module running at zero power.

[0059] In some other optional embodiments, Figure 4 As shown, the control method may also include the following processing steps: step S4, when the current electricity price changes from a valley electricity price to a non-valley electricity price, switching the currently used second fuel to the first fuel; step S5, controlling the flow rate of the first fuel to increase the power generation power of the power generation module from zero power to the target power.

[0060] The target power may be a power value preset in the fuel cell controller or a customer-set power value sent by the customer. The target power may be determined according to actual conditions, and this embodiment does not make any specific limitation on this.

[0061] In this embodiment, when the current electricity price changes from a valley electricity price to a non-valley electricity price, it is necessary to increase the power generation power of the power generation module. The fuel can be switched to a more efficient first fuel, and the flow rate of the first fuel can be continuously increased to increase the power generation power of the power generation module to the target power, thereby increasing the power production capacity of the power generation module and then improving the economic benefits.

[0062] In summary, the SOFC power generation system control method provided in this embodiment can control the power generation module to reduce the power generation to zero when the current electricity price is the valley electricity price, and when the power generation module is running at zero power, the first fuel with higher economic cost and carbon emission is switched to the second fuel with lower economic cost and carbon emission. And the flow rate of the second fuel introduced into the power generation module is continuously adjusted to keep the power generation module running normally at zero power. The above-mentioned second fuel can also be introduced into the cold and heat supply module, and the flow rate of the second fuel introduced into the cold and heat supply module is adjusted in real time to keep the cold and heat supply module for normal cold / heat supply. In this way, by switching between the two fuels, when the current electricity price is the valley electricity price, the economic cost and carbon emissions of the SOFC power generation system can be reduced while ensuring that the SOFC power generation system does not stop (the power generation module is running at zero power).

[0063] Based on the same concept as the above-mentioned SOFC power generation system control method, the embodiment of the present application also provides a fuel cell controller, which is applied to the above-mentioned SOFC power generation system and is used to implement the above-mentioned SOFC power generation system control method, such as Figure 5 As shown, the fuel cell controller includes:

[0064] The fuel switching module is used to control the power generation module to reduce the power generation to zero and switch the first fuel currently used to the second fuel when the current electricity price is the valley electricity price; the power generation efficiency and economic cost of the first fuel are higher than those of the second fuel;

[0065] a first adjustment module, used for obtaining a current fuel composition of the second fuel, and adjusting a first flow value of the second fuel according to the current fuel composition, so as to keep the power generation module running at zero power;

[0066] The second adjustment module is used to obtain the air flow and exhaust gas temperature in the power generation module, and adjust the second flow value of the second fuel according to the air flow and exhaust gas temperature to keep the cold / hot supply module performing cold / hot supply.

[0067] It can be understood that the master control device for the SOFC power generation system provided in this embodiment is used to execute the above-mentioned SOFC power generation system control method, so it can at least achieve the beneficial effects that can be achieved by the above-mentioned SOFC power generation system control method, and the various implementation methods of the above-mentioned SOFC power generation system control method are also applicable to the master control device for the SOFC power generation system, which will not be repeated here.

[0068] Based on the same concept as the above-mentioned SOFC power generation system control method, the embodiment of the present application also provides a SOFC power generation system, such as Figure 2 As shown, the SOFC power generation system includes a power generation module, a fuel supply module, a cold and hot supply module, and a fuel cell controller according to claim 5. The fuel cell controller can be connected to the fuel supply module, the grid-connected and off-grid module, and each power generation module, and execute the SOFC power generation system control method in any of the above embodiments.

[0069] It can be understood that the SOFC power generation system provided in this embodiment includes a fuel cell controller for executing the above-mentioned SOFC power generation system control method, so it can at least achieve the beneficial effects that can be achieved by the above-mentioned SOFC power generation system control method, and the various embodiments of the above-mentioned SOFC power generation system control method are also applicable to the SOFC power generation system, which will not be repeated here.

[0070] In some optional embodiments, such as Figure 3As shown, the fuel supply module may include a fuel gas circuit and a fuel switching controller, the fuel gas circuit is used to provide a first fuel and a second fuel; the fuel switching controller is used to control the on-off of the fuel gas circuit that provides fuel to the power generation module, thereby realizing switching between the first fuel and the second fuel.

[0071] Specifically, the fuel supply module may also include a gas composition detector, which is arranged on the air intake passage of the power generation module, for real-time detection of the composition of the second fuel in the fuel entering the power generation module, and sending the detection result to the fuel cell controller.

[0072] In this embodiment, a fuel gas composition detector may be provided on the air intake passage of the power generation module to detect the composition of the second fuel in the fuel entering the power generation module, that is, the proportion of the second fuel in all fuel gases in the power generation module.

[0073] It is understandable that the present embodiment does not specifically limit the specific structure of the gas composition detector, as long as it is installed on the air intake passage of the power generation module and can detect the fuel composition entering the power generation module in real time. When the fuel components entering the power generation module include only one or two, it can detect only one fuel component, and then based on the known fuel type and the composition of one of the fuels, it can calculate the composition of each of the two fuels. Of course, the gas composition detector can also be more advanced to detect the composition of each fuel in all the fuels entering the power generation module, so that the composition value of each fuel can be directly obtained without calculation, thereby improving the control sensitivity and the working efficiency of the power generation system.

[0074] In some other optional embodiments, the cold and hot supply module is connected to the fuel supply module and the power generation module, and is connected to the second fuel and the high-temperature tail gas of the power generation module respectively. In this way, the high-temperature tail gas of the power generation module is used in the heating system of the cold and hot supply module, which can improve the fuel utilization rate, reduce the overall cost, and thus improve the overall economic benefits. And the problem of insufficient heat generation of biomass gas can be solved by adding fuel to the cold and hot supply module.

[0075] In addition, the SOFC power generation system also includes a cloud platform, which is connected to the fuel cell controller via a bus protocol and sends the current electricity price to the fuel cell controller.

[0076] In this embodiment, the cloud platform can be used to connect with the client device and external devices, and receive messages sent by the client device and other external devices, such as receiving the current electricity price and the power set by the customer. By connecting to the cloud platform, the Internet of Things of multiple devices can be realized, making the system more intelligent. Specifically, the instructions and data sent by the client device can be received through the interactive interface.

[0077] In a specific embodiment, the SOFC power generation system control method provided in the embodiment of the present application is applied to Figure 3 In the power generation system shown in FIG. 1 , the specific implementation process can be as shown in FIG. Figure 6 As shown, the following steps are included:

[0078] a) The cloud platform sends the current real-time electricity price to the FCU via bus 1;

[0079] b) FCU determines whether the current electricity price is a valley price. If not, it uses natural gas to generate electricity according to the power set by the customer. If it is a valley price, it will operate in the valley price mode;

[0080] c) FCU controls the SOFC system to reduce power to zero power and controls the natural gas to switch to biomass gas;

[0081] d) FCU corrects the fuel composition correction coefficient of biomass MFC1 (flow controller 1) in real time according to the fuel composition detector, so as to adjust the gas flow and ensure the normal operation of the system;

[0082] e) FCU adjusts the flow rate of biomass gas MFC2 (flow controller 2) according to the current air flow rate and exhaust gas temperature to ensure the cold / hot supply of the absorption cold / hot supplier;

[0083] f) When the electricity price is off-peak, the FCU controls the fuel to switch from biomass gas to natural gas and gradually increases the output power to the target value;

[0084] g) After the system output power reaches the target value, the system continues to generate electricity stably until the next valley power time period arrives, and steps cg are repeated.

[0085] The present application also provides an electronic device to execute the above-mentioned SOFC power generation system control method. Figure 7 , which shows a schematic diagram of an electronic device provided by some embodiments of the present application. Figure 7 As shown, the electronic device 7 includes: a processor 701, a memory 702, a storage 703 and a communication interface 704, and the processor 701, the communication interface 704 and the storage 702 are connected through the storage 703; the storage 702 stores a computer program that can be run on the processor 701, and when the processor 701 runs the computer program, it executes the SOFC power generation system control method provided in any of the aforementioned embodiments of the present application.

[0086] The memory 702 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The communication connection between the device network element and at least one other network element is realized through at least one communication interface 704 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0087] The memory 703 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory 702 is used to store programs, and the processor 701 executes the programs after receiving the execution instructions. The control method of the SOFC power generation system disclosed in any of the embodiments of the present application may be applied to the processor 701, or implemented by the processor 701.

[0088] The processor 701 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 701. The above processor 701 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a readily available programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor can be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702 and completes the steps of the above method in combination with its hardware.

[0089] The electronic device provided in the embodiment of the present application and the SOFC power generation system control method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, operated or implemented therein.

[0090] An embodiment of the present application also provides a computer-readable storage medium corresponding to the SOFC power generation system control method provided in the aforementioned embodiment, on which a computer program (i.e., a program product) is stored. When the computer program is run by a processor, it will execute the SOFC power generation system control method provided in any of the aforementioned embodiments.

[0091] It should be noted that computer-readable storage media may include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory, optical disks or other optical or magnetic storage media, etc., which are not listed here one by one.

[0092] The computer-readable storage medium provided in the embodiment of the present application and the SOFC power generation system control method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the method adopted, run or implemented by the application program stored therein.

[0093] The embodiment of the present application also provides a computer program product corresponding to the SOFC power generation system control method provided in the above embodiment, including a computer program, which is executed by a processor to implement the above SOFC power generation system control method.

[0094] The computer program product provided in the embodiment of the present application is based on the same inventive concept as the SOFC power generation system control method provided in the embodiment of the present application, and has the same beneficial effects as the method implemented by executing the computer program thereof by a processor.

[0095] It can be understood that the above description of the various embodiments tends to emphasize the differences between the various embodiments, and the same or similar points can be referenced to each other. For the sake of brevity, they will not be repeated herein.

[0096] It is understood by those skilled in the art that in the above method of the specific embodiment, the order of writing each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for controlling a SOFC power generation system, characterized in that: The SOFC power generation system includes a power generation module and a cold and hot supply module, and the method includes: When the current electricity price is a valley electricity price, the power generation module is controlled to reduce the power generation to zero, and the first fuel currently used is switched to a second fuel; the economic cost of the first fuel is higher than the economic cost of the second fuel; Acquire the current fuel composition flowing into the power generation module, and adjust the first flow value of the second fuel according to the current fuel composition to keep the power generation module running at zero power; The air flow and the exhaust gas temperature in the power generation module are obtained, and the second flow value of the second fuel is adjusted according to the air flow and the exhaust gas temperature to keep the cold / hot supply module performing cold / hot supply.

2. The method according to claim 1, characterized in that The method further comprises: When the current electricity price changes from the valley electricity price to the non-valley electricity price, switching the second fuel currently used to the first fuel; The flow rate of the first fuel is controlled to increase the power generation of the power generation module from zero power to target power.

3. The method according to claim 1, characterized in that The obtaining of the current fuel composition passed into the power generation module comprises: Acquire real-time detection data of a gas composition detector; the gas composition detector is arranged on the air intake passage of the power generation module, and is used to detect the composition of the second fuel in the fuel passing into the power generation module in real time; The current fuel composition entering the power generation module is determined based on the real-time detection data.

4. The method according to claim 1, characterized in that The second fuel is a renewable energy source that can be used to generate electricity in the battery.

5. A fuel cell controller, characterized in that: The SOFC power generation system applied to the power generation module and the cold and heat supply module includes: the fuel cell controller includes: A fuel switching module, used for controlling the power generation module to reduce the power generation to zero and switch the first fuel currently used to a second fuel when the current electricity price is a valley electricity price; the economic cost of the first fuel is higher than the economic cost of the second fuel; a first adjustment module, configured to obtain a current fuel composition of the second fuel, and adjust a first flow value of the second fuel according to the current fuel composition, so as to keep the power generation module operating at zero power; The second adjustment module is used to obtain the air flow and exhaust gas temperature in the power generation module, and adjust the second flow value of the second fuel according to the air flow and the exhaust gas temperature to maintain the cold / hot supply module.

6. A SOFC power generation system, characterized in that: It comprises a power generation module, a fuel supply module, a cold and hot supply module and the fuel cell controller as claimed in claim 5.

7. The SOFC power generation system according to claim 6, characterized in that: The fuel supply module includes a fuel gas circuit and a fuel switching controller, wherein the fuel gas circuit is used to provide the first fuel and the second fuel; the fuel switching controller is used to control the on-off of the fuel gas circuit that provides fuel to the power generation module.

8. The SOFC power generation system according to claim 7, characterized in that: The fuel supply module also includes a gas composition detector, which is arranged on the air intake passage of the power generation module and is used to detect the composition of the second fuel in the fuel entering the power generation module in real time and send the detection result to the fuel cell controller.

9. The SOFC power generation system according to claim 6, characterized in that: The cold and hot supply module is connected to the fuel supply module and the power generation module, and is respectively connected to the second fuel and the high-temperature exhaust gas of the power generation module.

10. The SOFC power generation system according to claim 6, characterized in that: The SOFC power generation system also includes a cloud platform, which is connected to the fuel cell controller via a bus protocol and sends the current electricity price to the fuel cell controller.

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