Energy management method and device of cogeneration system, control equipment and medium

Abstract

The invention discloses an energy management method and device of a combined heat and power system, control equipment and a medium. The method comprises the steps of determining an operation mode of the combined heat and power system at a current time point according to a connection mode of an off-grid and grid-connected direct-current and alternating-current converter, a user and a power grid; wherein the connection mode comprises the following steps: the off-grid and grid-connected DC-AC converter is connected with a user and a power grid at the same time; or, the off-grid and grid-connected DC-AC converter is only connected with the user; the operation mode comprises a grid-connected mode or an off-grid mode; calculating the initial power of the fuel cell system at the current time point according to a predetermined output power calculation mode corresponding to the operation mode; and acquiring the electric quantity of the energy storage battery at the current time point, and adjusting the initial power of the fuel cell system at the current time point according to the electric quantity of the energy storage battery at the current time point and the electric quantity threshold value. The output power of the fuel cell system can be prevented from being in a frequent change state, so that the service life of the fuel cell system is prolonged.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy technology, and in particular to an energy management method, device, control equipment and medium for a combined heat and power system. Background Art

[0002] Combined Heat and Power (CHP) is a highly efficient energy utilization system that can produce both electricity and heat. It generates electricity by using waste heat to generate steam to drive turbine generators, and at the same time can recycle waste heat for heating, industrial hot water, etc. The energy used by the combined heat and power system can be natural gas, fuel oil, biomass, etc. It can improve the efficiency of energy utilization, reduce the emission of pollutants such as carbon dioxide, and has the advantages of environmental protection, energy saving, and sustainable development. The combined heat and power system can be used in industry, commerce, medical care, tourism and other fields, and is one of the important directions of energy development in modern cities.

[0003] The combined heat and power system can usually include: a fuel cell system (FCS), a battery storage (BAT) and an off-grid DC-AC converter (DCAC); wherein the fuel cell system is used to provide energy for the combined heat and power system, and is an energy generating device of the combined heat and power system; the battery storage is responsible for storing electrical energy; the off-grid DC-AC converter is responsible for the conversion between DC and AC and the conversion between the grid-connected mode and the off-grid mode of the combined heat and power system.

[0004] In the prior art, the output power of the fuel cell system changes in real time with the power request of the off-grid DC-AC converter. This method causes the output power of the fuel cell system to be in a state of frequent changes, which has a great impact on the service life of the fuel cell system, and the frequent load changes also put forward higher requirements for the control of the fuel cell system. Summary of the invention

[0005] The present application provides an energy management method, device, control equipment and medium for a cogeneration system, which can prevent the output power of a fuel cell system from being in a state of frequent changes, thereby increasing the service life of the fuel cell system.

[0006] In a first aspect, an embodiment of the present application provides an energy management method for a combined heat and power system, wherein the combined heat and power system comprises at least: a fuel cell system, an energy storage battery, and an off-grid DC / AC converter; the method comprises:

[0007] Determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC / AC converter with the user and the grid; wherein the connection mode includes: the off-grid DC / AC converter is connected to the user and the grid at the same time; or the off-grid DC / AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode;

[0008] Calculating the initial power of the fuel cell system at the current time point according to the predetermined output power calculation method corresponding to the operation mode;

[0009] The power level of the energy storage battery at the current time point is obtained, and the initial power of the fuel cell system at the current time point is adjusted according to the power level of the energy storage battery at the current time point and the power level threshold.

[0010] In a second aspect, an embodiment of the present application further provides an energy management device for a cogeneration system, the device comprising: a determination module, a calculation module and an adjustment module; wherein:

[0011] The determination module is used to determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC / AC converter with the user and the grid; wherein the connection mode includes: the off-grid DC / AC converter is connected to the user and the grid at the same time; or the off-grid DC / AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode;

[0012] The calculation module is used to calculate the initial power of the fuel cell system at a current time point according to a predetermined output power calculation method corresponding to the operation mode;

[0013] The adjustment module is used to obtain the power of the energy storage battery at the current time point, and adjust the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold.

[0014] In a third aspect, an embodiment of the present application provides a control device, including:

[0015] one or more processors;

[0016] a memory for storing one or more programs,

[0017] When the one or more programs are executed by the one or more processors, the one or more processors implement the energy management method for the cogeneration system described in any embodiment of the present application.

[0018] In a fourth aspect, an embodiment of the present application provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the energy management method for the cogeneration system described in any embodiment of the present application.

[0019] The embodiment of the present application proposes an energy management method, device, control equipment and medium for a cogeneration system. First, the operation mode of the cogeneration system at the current time point is determined according to the connection mode between the off-grid DC-AC converter and the user and the power grid; then, the initial power of the fuel cell system at the current time point is calculated according to the output power calculation method corresponding to the predetermined operation mode; then the power of the energy storage battery at the current time point is obtained, and the initial power of the fuel cell system at the current time point is adjusted according to the power of the energy storage battery at the current time point and the power threshold. That is to say, in the technical solution of the present application, the output power of the fuel cell system does not change in real time, but the initial power of the fuel cell system at the current time point is adjusted according to the power of the energy storage battery at the current time point and the power threshold. In the prior art, the output power of the fuel cell system will change in real time with the power request of the off-grid DC-AC converter. Therefore, compared with the prior art, the energy management method, device, control equipment and medium of the cogeneration system proposed in the embodiment of the present application can avoid the output power of the fuel cell system from being in a frequently changing state, thereby improving the service life of the fuel cell system; and the technical solution of the embodiment of the present application is simple and convenient to implement, easy to popularize, and has a wider range of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A first flow chart of an energy management method for a combined heat and power system provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of a combined heat and power system provided in an embodiment of the present application;

[0022] Figure 3 A second flow chart of the energy management method for a combined heat and power system provided in an embodiment of the present application;

[0023] Figure 4 A third flow chart of the energy management method for a combined heat and power system provided in an embodiment of the present application;

[0024] Figure 5 A third flow chart of the energy management method for a combined heat and power system provided in an embodiment of the present application;

[0025] Figure 6 A fourth flow chart of the energy management method for a combined heat and power system provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the structure of an energy management device for a combined heat and power system provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram of the structure of a control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only the parts related to the present application, rather than all structures, are shown in the accompanying drawings.

[0029] Embodiment 1

[0030] Figure 1 This is a schematic diagram of the first process flow of the energy management method for a cogeneration system provided in an embodiment of the present application. The method can be executed by an energy management device or control device for a cogeneration system. The device or control device can be implemented by software and / or hardware. The device or control device can be integrated in any intelligent device with network communication function. Figure 1 As shown, the energy management method of the combined heat and power system may include the following steps:

[0031] S101. Determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC-AC converter with the user and the power grid; wherein the connection mode includes: the off-grid DC-AC converter is connected to the user and the power grid at the same time; or the off-grid DC-AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode.

[0032] Figure 2 This is a schematic diagram of the structure of the combined heat and power system provided in the embodiment of the present application. Figure 2 As shown, the combined heat and power system may at least include: a fuel cell system, an energy storage battery and an off-grid DC-AC converter; wherein, when the energy storage battery is in a charging state, part of the energy of the fuel cell system flows to the energy storage battery; another part of the energy flows to the off-grid DC-AC converter; when the energy storage battery is in a discharging state, both the energy of the fuel cell system and the energy of the energy storage battery flow to the off-grid DC-AC converter. The off-grid DC-AC converter may be connected to the grid and the user at the same time, or may be connected only to the user. When the off-grid DC-AC converter is connected to the grid and the user at the same time, the operation mode of the combined heat and power system is the grid-connected mode; when the off-grid DC-AC converter is only connected to the user, the operation mode of the combined heat and power system is the off-grid mode.

[0033] The combined heat and power system is an efficient way of energy utilization. It can simultaneously utilize the thermal energy and mechanical energy of the fuel and convert them into electrical energy and thermal energy. The working modes of the combined heat and power system are different in the grid-connected mode and the off-grid mode, as follows: 1) Grid-connected mode: When the combined heat and power system works in the grid-connected mode, it can both transmit electricity to the grid and supply thermal energy to local users. The combined heat and power system can sell the generated electricity to the power company through the power company's grid, thereby achieving economic benefits. The grid-connected combined heat and power system has higher advantages, can provide more reliable power supply, and reduce the problem of grid voltage drop. In the grid-connected mode, the combined heat and power system needs to be able to meet the safety and stability requirements of the grid, so it needs to comply with relevant power standards and regulations. 2) Off-grid mode: When the combined heat and power system works in the off-grid mode, it does not need to be connected to the grid, but provides electricity and thermal energy to a household or enterprise alone. The off-grid combined heat and power system is relatively small, mainly providing power supply solutions for occasions that do not need to be connected to the main grid. At this time, the combined heat and power system needs to store electricity through internal control systems and batteries to ensure uninterrupted power supply and achieve the highest possible degree of autonomy. The off-grid combined heat and power system can save electricity costs, reduce environmental pollution, and has the potential to export electricity. Whether in grid-connected or off-grid mode, the combined heat and power system can improve energy efficiency, reduce production costs, and reduce environmental impact.

[0034] S102: Calculate the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined operation mode.

[0035] The fuel cell system is an energy system based on fuel cells that can react hydrogen and oxygen to produce water and electricity. Compared with traditional combustion power generation methods, the fuel cell system has the advantages of high efficiency, environmental protection, and low noise. It can be used as a power source for mobile equipment such as cars, ships, and airplanes, and can also be used for energy supply for fixed equipment such as power stations. The fuel cell system includes components such as fuel cells, hydrogen storage, and control systems. The fuel cell is the core part. Its working principle is to pass hydrogen through the anode and oxygen through the cathode to interact with the catalyst to produce electrons, ions, and molecules. The control equipment can monitor and adjust the working status of the fuel cell system in real time to ensure its safe and reliable operation, while ensuring the life and performance of the fuel cell.

[0036] In this step, the control device can calculate the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined operation mode. Specifically, if the operation mode is the grid-connected mode, the control device can calculate the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined operation mode. ac Calculate the output power P of the fuel cell system fcs; If the output power of the fuel cell system P fcs If the output power P of the fuel cell system is greater than or equal to a preset percentage of the rated power of the fuel cell system, the control device can fcs Determined as the initial power output by the fuel cell system to the energy storage battery and the off-grid DC-AC converter at the current time point; if the output power P of the fuel cell system fcs If the output power P of the fuel cell system is greater than or equal to a preset percentage of the rated power of the fuel cell system, the control device can fcs is determined as the initial power of the fuel cell system at the current time point; if the output power P of the fuel cell system fcs If the power of the fuel cell system is smaller than a preset percentage of the rated power of the fuel cell system, the control device may determine the preset percentage of the rated power of the fuel cell system as the initial power of the fuel cell system at the current time point.

[0037] Optionally, if the operation mode is the off-grid mode, the control device may determine a preset percentage of the rated power of the fuel cell system as the initial power of the fuel cell system at the current time point.

[0038] S103, obtaining the power of the energy storage battery at the current time point, and adjusting the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold.

[0039] In this step, the control device can obtain the power of the energy storage battery at the current time point, and adjust the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. Specifically, if the operation mode is the grid-connected mode and the power of the energy storage battery at the current time point is greater than the first preset percentage of the full power, the control device can reduce the initial power of the fuel cell system at the current time point by the first preset power X1; if the power of the energy storage battery at the current time point is less than the second preset percentage of the full power, the control device can increase the initial power of the fuel cell system at the current time point by the second preset power Y1; wherein the first preset percentage is greater than the second preset percentage. In the embodiment of the present application, the first preset percentage can be 60%; the second preset percentage can be 40%. The first preset power X1 and the second preset power Y1 are calibrated according to the charging and discharging capacity of the energy storage battery, and are not necessarily fixed values, and are intended to meet the energy storage battery power between the second preset percentage and the first preset percentage, for example, between 40% and 60%.

[0040] Optionally, if the operation mode is off-grid mode and the power of the energy storage battery at the current time point is greater than the third preset percentage of the full power, the control device may reduce the initial power of the fuel cell system at the current time point by the third preset power X2; if the operation mode is off-grid mode and the power of the energy storage battery at the current time point is less than the fourth preset percentage of the full power, the control device may increase the initial power of the fuel cell system at the current time point by the fourth preset power Y2; wherein the third preset percentage is greater than the fourth preset percentage. The third preset percentage in the embodiment of the present application may be 60%; the fourth preset percentage may be 40%. The settings of the third preset power X2 and the fourth preset power Y2 are similar to the settings of the first preset power X1 and the second preset power Y1 described above, and are intended to satisfy that the power of the energy storage battery is between the fourth preset percentage and the third preset percentage, for example, between 40% and 60%.

[0041] The energy management method of the cogeneration system proposed in the embodiment of the present application first determines the operation mode of the cogeneration system at the current time point according to the connection mode between the off-grid DC-AC converter and the user and the power grid; then calculates the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined operation mode; then obtains the power of the energy storage battery at the current time point, and adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. That is to say, in the technical solution of the present application, the output power of the fuel cell system does not change in real time, but adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. In the prior art, the output power of the fuel cell system will change in real time with the power request of the off-grid DC-AC converter. Therefore, compared with the prior art, the energy management method of the cogeneration system proposed in the embodiment of the present application can avoid the output power of the fuel cell system from being in a frequently changing state, thereby improving the service life of the fuel cell system; and the technical solution of the embodiment of the present application is simple and convenient to implement, easy to popularize, and has a wider range of application.

[0042] Embodiment 2

[0043] Figure 3 The second flow chart of the energy management method for the combined heat and power system provided in the embodiment of the present application is further optimized and expanded based on the above technical solution, and can be combined with the above optional implementation methods. Figure 3 As shown, the energy management method of the combined heat and power system may include the following steps:

[0044] S301. Determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC-AC converter with the user and the power grid; wherein the connection mode includes: the off-grid DC-AC converter is connected to the user and the power grid at the same time; or the off-grid DC-AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode.

[0045] S302: If the operation mode is the grid-connected mode, the output power of the fuel cell system is calculated according to the power generation power of the combined heat and power system input in advance by the user.

[0046] In this step, if the operation mode is the grid-connected mode, the control device can set the power generation power P of the cogeneration system pre-entered by the user. ac Calculate the output power P of the fuel cell system fcs Specifically, the control device can calculate the output power P according to the following formula: fcs :P fcs =P ac / η; where P fcs is the output power of the fuel cell system; P ac is the power generation capacity of the combined heat and power system input by the user; η is the predetermined conversion parameter.

[0047] S303 : Determine the initial power of the fuel cell system at the current time point according to the output power of the fuel cell system and a preset percentage of the rated power of the fuel cell system.

[0048] In this step, the control device can be based on the output power P of the fuel cell system fcs and a preset percentage of the rated power of the fuel cell system to determine the initial power of the fuel cell system at the current time point. Specifically, if the output power P of the fuel cell system fcs If the output power P of the fuel cell system is greater than or equal to a preset percentage of the rated power of the fuel cell system, the control device can fcs is determined as the initial power of the fuel cell system at the current time point; if the output power P of the fuel cell system fcs If the power of the fuel cell system is smaller than a preset percentage of the rated power of the fuel cell system, the control device may determine the preset percentage of the rated power of the fuel cell system as the initial power of the fuel cell system at the current time point.

[0049] S304, determining whether the power of the energy storage battery at the current time point is greater than a first preset percentage of the full power; if so, executing S305; otherwise, executing S306.

[0050] In this step, the control device can determine whether the power of the energy storage battery at the current time point is greater than the first preset percentage of the full power; if the power of the energy storage battery at the current time point is greater than the first preset percentage of the full power, S305 is executed; if the power of the energy storage battery at the current time point is less than or equal to the first preset percentage of the full power, S306 is executed. The first preset percentage in the embodiment of the present application can be 60%.

[0051] S305 , reducing the initial power of the fuel cell system at the current time point by a first predetermined power X1.

[0052] S306, determining whether the power level of the energy storage battery at the current time point is less than a second preset percentage of the full power level; if so, executing S307; otherwise, executing S308.

[0053] In this step, the control device can determine whether the power of the energy storage battery at the current time point is less than the second preset percentage of the full power; if the power of the energy storage battery at the current time point is less than the second preset percentage of the full power, S307 is executed; if the power of the energy storage battery at the current time point is greater than or equal to the second preset percentage of the full power, S308 is executed. The second preset percentage in the embodiment of the present application is 40%.

[0054] S307, increasing the initial power of the fuel cell system at the current time point by a second predetermined power Y1.

[0055] S308: Keep the initial power of the fuel cell system at the current time point unchanged.

[0056] The energy management method of the cogeneration system proposed in the embodiment of the present application first determines the operation mode of the cogeneration system at the current time point according to the connection mode between the off-grid DC-AC converter and the user and the power grid; then calculates the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined operation mode; then obtains the power of the energy storage battery at the current time point, and adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. That is to say, in the technical solution of the present application, the output power of the fuel cell system does not change in real time, but adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. In the prior art, the output power of the fuel cell system will change in real time with the power request of the off-grid DC-AC converter. Therefore, compared with the prior art, the energy management method of the cogeneration system proposed in the embodiment of the present application can avoid the output power of the fuel cell system from being in a frequently changing state, thereby improving the service life of the fuel cell system; and the technical solution of the embodiment of the present application is simple and convenient to implement, easy to popularize, and has a wider range of application.

[0057] Embodiment 3

[0058] Figure 4 The third flow chart of the energy management method of the combined heat and power system provided in the embodiment of the present application is further optimized and expanded based on the above technical solution, and can be combined with the above optional implementation methods. Figure 4 As shown, the energy management method of the combined heat and power system may include the following steps:

[0059] S401. Determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC-AC converter with the user and the power grid; wherein the connection mode includes: the off-grid DC-AC converter is connected to the user and the power grid at the same time; or the off-grid DC-AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode.

[0060] S402: If the operation mode is the off-grid mode, a preset percentage of the rated power of the fuel cell system is determined as the initial power of the fuel cell system at the current time point.

[0061] In this step, if the operation mode is off-grid mode, the control device can determine a preset percentage of the rated power of the fuel cell system as the initial power of the fuel cell system at the current time point. The preset percentage in the embodiment of the present application can be 60%.

[0062] S403, determining whether the power of the energy storage battery at the current time point is greater than a first preset percentage of the full power; if so, executing S404; otherwise, executing S405.

[0063] S404, reducing the initial power of the fuel cell system at the current time point by a first predetermined power X2.

[0064] S405, determining whether the power level of the energy storage battery at the current time point is less than a second preset percentage of the full power level; if so, executing S406; otherwise, executing S407.

[0065] S406, increasing the initial power of the fuel cell system at the current time point by a second predetermined power Y2.

[0066] S407: Keep the initial power of the fuel cell system at the current time point unchanged.

[0067] The energy management method of the cogeneration system proposed in the embodiment of the present application first determines the operation mode of the cogeneration system at the current time point according to the connection mode between the off-grid DC-AC converter and the user and the power grid; then calculates the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined operation mode; then obtains the power of the energy storage battery at the current time point, and adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. That is to say, in the technical solution of the present application, the output power of the fuel cell system does not change in real time, but adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. In the prior art, the output power of the fuel cell system will change in real time with the power request of the off-grid DC-AC converter. Therefore, compared with the prior art, the energy management method of the cogeneration system proposed in the embodiment of the present application can avoid the output power of the fuel cell system from being in a frequently changing state, thereby improving the service life of the fuel cell system; and the technical solution of the embodiment of the present application is simple and convenient to implement, easy to popularize, and has a wider range of application.

[0068] Embodiment 4

[0069] Figure 5 The third flow chart of the energy management method of the combined heat and power system provided in the embodiment of the present application is further optimized and expanded based on the above technical solution, and can be combined with the above optional implementation methods. Figure 5 As shown, the energy management method of the combined heat and power system may include the following steps:

[0070] S501, calculating the time it takes for the power of the energy storage battery at the current time point to approach a first power setting value.

[0071] In this step, the control device can calculate the amount of electricity of the energy storage battery at the current time point to be close to the first electricity setting value SOC according to the following formula: setpoint1 Time: Among them, t1 is the current time when the power of the energy storage battery approaches the first power setting value SOC setpoint1 Time; SOC setpoint1 is the first power setting value; SOC is the power of the energy storage battery at the current time point; V bat is the predetermined voltage of the energy storage battery; Ah is the predetermined maximum capacitance of the energy storage battery; P bat is the output power of the energy storage battery at the current time point. In addition, the control device can also calculate the output power P of the energy storage battery at the current time point according to the following formula: bat : It should be noted that, in the grid-connected mode, the power generation power P of the cogeneration system in the embodiment of the present application is ac is fixed; the output power P of the fuel cell system fcs And the output power P of the energy storage battery bat In off-grid mode, the output power P of the fuel cell system in the embodiment of the present application is variable. fcs is fixed; the power generation power P of the combined heat and power system ac And the output power P of the energy storage battery bat is mutable.

[0072] S502. If the time when the power of the energy storage battery at the current time point approaches the first power setting value and the pre-calculated time when the power of the fuel cell system at the previous N time points at the current time point approaches the first power setting value are both less than the first predetermined time length, and the power of the energy storage battery at the current time point is greater than the fifth preset percentage of the full power, the fuel cell system is turned on.

[0073] The first power setting value SOC in the embodiment of the present application setpoint1 It may be 90% of the full power; the first predetermined time may be 1 minute; and the fifth preset percentage may be 30%.

[0074] S503. Determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC-AC converter with the user and the power grid; wherein the connection mode includes: the off-grid DC-AC converter is connected to the user and the power grid at the same time; or the off-grid DC-AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode.

[0075] S504: Calculate the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined operation mode.

[0076] S505: Acquire the power of the energy storage battery at the current time point, and adjust the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold.

[0077] S506, calculating the time it takes for the power of the energy storage battery at the current time point to approach a second power setting value; wherein the first power setting value is less than the second power setting value.

[0078] In this step, the control device can calculate the amount of electricity of the energy storage battery at the current time point to be close to the second electricity setting value SOC according to the following formula: setpoint2 Time: Among them, t2 is the current time point when the power of the energy storage battery approaches the first power setting value SOC setpoint2 Time; SOC setpoint2 is the first power setting value; SOC is the power of the energy storage battery at the current time point; V bat is the predetermined voltage of the energy storage battery; Ah is the predetermined maximum capacitance of the energy storage battery; P bat is the output power of the energy storage battery at the current time point. In addition, the control device can also calculate the output power P of the energy storage battery at the current time point according to the following formula: bat : The first power setting value SOC in the embodiment of the present application setpoint1 Less than the second power setting value SOC setpoint2 .

[0079] S507. If the time when the power of the energy storage battery at the current time point approaches the second power setting value and the pre-calculated time when the power of the fuel cell system at the previous N time points at the current time point approaches the second power setting value are both less than the second predetermined time length, and the power of the energy storage battery at the current time point is greater than the sixth preset percentage of the full power, the fuel cell system is shut down.

[0080] The second power setting value SOC in the embodiment of the present application setpoint1 It may be 10% of the full amount of electricity; the second predetermined time may also be 1 minute; and the sixth preset percentage may be 70%.

[0081] The energy management method of the cogeneration system proposed in the embodiment of the present application first determines the operation mode of the cogeneration system at the current time point according to the connection mode between the off-grid DC-AC converter and the user and the power grid; then calculates the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined operation mode; then obtains the power of the energy storage battery at the current time point, and adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. That is to say, in the technical solution of the present application, the output power of the fuel cell system does not change in real time, but adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. In the prior art, the output power of the fuel cell system will change in real time with the power request of the off-grid DC-AC converter. Therefore, compared with the prior art, the energy management method of the cogeneration system proposed in the embodiment of the present application can avoid the output power of the fuel cell system from being in a frequently changing state, thereby improving the service life of the fuel cell system; and the technical solution of the embodiment of the present application is simple and convenient to implement, easy to popularize, and has a wider range of application.

[0082] Embodiment 5

[0083] Figure 6 The fourth flow chart of the energy management method of the combined heat and power system provided in the embodiment of the present application is further optimized and expanded based on the above technical solution, and can be combined with the above optional implementation methods. Figure 6 As shown, the energy management method of the combined heat and power system may include the following steps:

[0084] S601: If the power level of the energy storage battery at the current time point is less than the seventh preset percentage of the full power level, the fuel cell system is turned on.

[0085] In this step, if the power of the energy storage battery at the current time point is less than the seventh preset percentage of the full power, the control device can start the fuel cell system. The seventh preset percentage in the embodiment of the present application can be 20%.

[0086] S602. Determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC-AC converter with the user and the power grid; wherein the connection mode includes: the off-grid DC-AC converter is connected to the user and the power grid at the same time; or the off-grid DC-AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode.

[0087] S603: Calculate the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined row mode.

[0088] S604, obtaining the power of the energy storage battery at the current time point, and adjusting the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold.

[0089] S605: If the power level of the energy storage battery at the current time point is greater than the eighth preset percentage of the full power level, the fuel cell system is shut down.

[0090] In this step, if the power of the energy storage battery at the current time point is greater than the eighth preset percentage of the full power, the control device can shut down the fuel cell system. The eighth preset percentage in the embodiment of the present application can be 80%.

[0091] The energy management method of the cogeneration system proposed in the embodiment of the present application first determines the operation mode of the cogeneration system at the current time point according to the connection mode between the off-grid DC-AC converter and the user and the power grid; then calculates the initial power of the fuel cell system at the current time point according to the output power calculation method corresponding to the predetermined operation mode; then obtains the power of the energy storage battery at the current time point, and adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. That is to say, in the technical solution of the present application, the output power of the fuel cell system does not change in real time, but adjusts the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold. In the prior art, the output power of the fuel cell system will change in real time with the power request of the off-grid DC-AC converter. Therefore, compared with the prior art, the energy management method of the cogeneration system proposed in the embodiment of the present application can avoid the output power of the fuel cell system from being in a frequently changing state, thereby improving the service life of the fuel cell system; and the technical solution of the embodiment of the present application is simple and convenient to implement, easy to popularize, and has a wider range of application.

[0092] Embodiment 6

[0093] Figure 7 This is a schematic diagram of the structure of the energy management device of the combined heat and power system provided in the embodiment of the present application. Figure 7 As shown, the energy management device of the cogeneration system includes: a determination module 701, a calculation module 702 and an adjustment module 703; wherein,

[0094] The determination module 701 is used to determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC / AC converter with the user and the grid; wherein the connection mode includes: the off-grid DC / AC converter is connected to the user and the grid at the same time; or the off-grid DC / AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode;

[0095] The calculation module 702 is used to calculate the initial power of the fuel cell system at the current time point according to the predetermined output power calculation method corresponding to the operation mode;

[0096] The adjustment module 703 is used to obtain the power of the energy storage battery at the current time point, and adjust the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold.

[0097] The energy management device of the above-mentioned cogeneration system can execute the method provided in any embodiment of the present application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the energy management method of the cogeneration system provided in any embodiment of the present application.

[0098] Embodiment 7

[0099] Figure 8 A schematic diagram of the structure of a control device provided in an embodiment of the present application. Figure 8 A block diagram of an exemplary control device suitable for implementing the embodiments of the present application is shown. Figure 8 The control device 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0100] like Figure 8 As shown, the control device 12 is in the form of a general purpose computing device. The components of the control device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 connecting various system components (including the system memory 28 and the processing unit 16).

[0101] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0102] The control device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the control device 12, including volatile and non-volatile media, removable and non-removable media.

[0103] The system memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The control device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media ( Figure 8 not shown, usually called a "hard drive"). Although Figure 8 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical medium) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present application.

[0104] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in the memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 42 generally perform the functions and / or methods of the embodiments described herein.

[0105] The control device 12 may also communicate with one or more external devices 14 (e.g., a keyboard, a pointing device, a display 24, etc.), one or more devices that enable a user to interact with the control device 12, and / or any device that enables the control device 12 to communicate with one or more other computing devices (e.g., a network card, a modem, etc.). Such communication may be performed via an input / output (I / O) interface 22. Furthermore, the control device 12 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 20. As shown, the network adapter 20 communicates with the other modules of the control device 12 via the bus 18. It should be understood that although Figure 8Not shown, other hardware and / or software modules may be used in conjunction with the control device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0106] The processing unit 16 executes various functional applications and data processing by running the programs stored in the system memory 28, such as implementing the energy management method of the cogeneration system provided in the embodiment of the present application.

[0107] Embodiment 8

[0108] An embodiment of the present application provides a computer storage medium.

[0109] The computer-readable storage medium of the embodiment of the present application can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, - but not limited to - a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive lists) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, a device or a device or used in combination with it.

[0110] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0111] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0112] Computer program code for performing the operation of the present application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0113] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An energy management method for a combined heat and power system, characterized in that: The cogeneration system comprises at least: a fuel cell system, an energy storage battery and an off-grid DC / AC converter; the method comprises: Determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC / AC converter with the user and the grid; wherein the connection mode includes: the off-grid DC / AC converter is connected to the user and the grid at the same time; or the off-grid DC / AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode; Calculating the initial power of the fuel cell system at the current time point according to the predetermined output power calculation method corresponding to the operation mode; The power level of the energy storage battery at the current time point is obtained, and the initial power of the fuel cell system at the current time point is adjusted according to the power level of the energy storage battery at the current time point and the power level threshold.

2. The method according to claim 1, characterized in that Calculating the initial power of the fuel cell system at the current time point according to a predetermined calculation method corresponding to the operation mode, including: If the operation mode is the grid-connected mode, the power generation power P of the cogeneration system pre-entered by the user is ac Calculate the output power P of the fuel cell system fcs ; According to the output power P of the fuel cell system fcs and a preset percentage of the rated power of the fuel cell system to determine the initial power of the fuel cell system at the current time point.

3. The method according to claim 2, characterized in that The output power P of the fuel cell system is calculated according to the following formula fcs :P fcs =P ac / η; where P fcs is the output power of the fuel cell system; P ac is the power generation of the combined heat and power system input by the user; η is the predetermined conversion parameter; According to the output power P of the fuel cell system fcs and a preset percentage of the rated power of the fuel cell system, determining the initial power of the fuel cell system at a current time point, comprising: If the output power P of the fuel cell system fcs If the output power P of the fuel cell system is greater than or equal to a preset percentage of the rated power of the fuel cell system, the output power P of the fuel cell system is fcs is determined as the initial power of the fuel cell system at the current time point; if the output power P of the fuel cell system fcs If the power consumption of the fuel cell system is less than a preset percentage of the rated power of the fuel cell system, the preset percentage of the rated power of the fuel cell system is determined as the initial power of the fuel cell system at the current time point.

4. The method according to claim 1, characterized in that Calculating the initial power of the fuel cell system at the current time point according to a predetermined calculation method corresponding to the operation mode, including: If the operation mode is the off-grid mode, a preset percentage of the rated power of the fuel cell system is determined as the initial power of the fuel cell system at the current time point.

5. The method according to claim 1, characterized in that Adjusting the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point includes: If the operation mode is the grid-connected mode and the power of the energy storage battery at the current time point is greater than a first preset percentage of the full power, the initial power of the fuel cell system at the current time point is reduced by a first predetermined power X1; If the power of the energy storage battery at the current time point is less than the second preset percentage of the full power, the initial power of the fuel cell system at the current time point is increased by a second predetermined power Y1; wherein the first preset percentage is greater than the second preset percentage.

6. The method according to claim 1, characterized in that Adjusting the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point includes: If the operation mode is the off-grid mode and the power of the energy storage battery at the current time point is greater than a third preset percentage of the full power, the initial power of the fuel cell system at the current time point is reduced by a third predetermined power X2; If the operating mode is an off-grid mode and the power of the energy storage battery at the current time point is less than the fourth preset percentage of the full power, the initial power of the fuel cell system at the current time point is increased by a fourth preset power Y2; wherein the third preset percentage is greater than the fourth preset percentage.

7. The method according to claim 1, characterized in that The method further comprises: The fuel cell system is turned on or off according to the power level of the energy storage battery at a current time point.

8. The method according to claim 1, characterized in that The method further comprises: Calculate whether the power of the energy storage battery at the current time point is close to the first power setting value SOC setpoint1 time; If the power of the energy storage battery at the current time point approaches the first power setting value SOC setpoint1 The time at which the power of the fuel cell system at the N time points before the current time point calculated in advance approaches the first power setting value SOC setpoint1 If the time is less than the first predetermined time length, and the power of the energy storage battery at the current time point is greater than a fifth preset percentage of the full power, the fuel cell system is turned on.

9. The method according to claim 8, characterized in that The method further comprises: Calculate whether the power of the energy storage battery at the current time point is close to the second power setting value SOC setpoint2 wherein the first power setting value SOC setpoint1 Less than the second power setting value SOC setpoint2 ; If the power of the energy storage battery at the current time point approaches the second power setting value SOC setpoint2 The time at which the power of the fuel cell system at the N time points before the current time point calculated in advance approaches the second power setting value SOC setpoimt2 If the time is less than the second predetermined time length, and the power of the energy storage battery at the current time point is greater than a sixth preset percentage of the full power, the fuel cell system is shut down.

10. An energy management device for a combined heat and power system, characterized in that: The device comprises: a determination module, a calculation module and an adjustment module; wherein, The determination module is used to determine the operation mode of the cogeneration system at the current time point according to the connection mode of the off-grid DC / AC converter with the user and the grid; wherein the connection mode includes: the off-grid DC / AC converter is connected to the user and the grid at the same time; or the off-grid DC / AC converter is only connected to the user; the operation mode includes: grid-connected mode or off-grid mode; The calculation module is used to calculate the initial power of the fuel cell system at a current time point according to a predetermined output power calculation method corresponding to the operation mode; The adjustment module is used to obtain the power of the energy storage battery at the current time point, and adjust the initial power of the fuel cell system at the current time point according to the power of the energy storage battery at the current time point and the power threshold.

11. A control device, characterized in that: include: one or more processors; a memory for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the energy management method for a combined heat and power system according to any one of claims 1 to 9.

12. A storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the energy management method for a combined heat and power system according to any one of claims 1 to 9 is implemented.

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