Emergency power supply control method, control terminal and storage medium

Abstract

The invention provides an emergency power supply control method, a control terminal and a storage medium. The method is applied to the emergency power supply. The emergency power supply comprises a DC power supply module, an AC power supply module, a photovoltaic module, an energy storage module and an inverter. The output end of the direct-current power supply module, the output end of the alternating-current power supply module, the output end of the photovoltaic module, the output end of the energy storage module and the input end of the inverter are all connected to a direct-current bus, and the output end of the inverter is used for supplying power to a load; the control method comprises the steps of determining whether the direct-current power module and the alternating-current power module are connected to a direct-current bus; if the direct-current power supply module is connected to the direct-current bus, or the alternating-current power supply module is connected to the direct-current bus, the photovoltaic module is controlled to operate in a maximum power point tracking mode; and if the direct current power supply module and the alternating current power supply module are not connected to the direct current bus, controlling the photovoltaic module to operate in a constant voltage mode. According to the invention, the photovoltaic module adaptively switches the working modes, so that smooth switching is realized, and the stability of the emergency power supply is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to an emergency power supply control method, a control terminal and a storage medium. Background Art

[0002] Emergency power supplies are devices or systems that provide power supply in the event of an emergency or power outage. They are designed to ensure that critical equipment and systems can continue to operate or enter a safe mode in emergency situations such as power outages, catastrophic events or equipment failures. Figure 1 The emergency power supply usually includes: DC power module, AC power module, photovoltaic module and inverter, etc. The DC power module, AC power module and photovoltaic module are all connected to the DC bus to supply power to the DC bus. At the same time, the DC bus supplies power to the load through the inverter, and the battery is also connected to the DC bus.

[0003] In the prior art, in order to obtain the maximum power generation efficiency, photovoltaic modules usually operate in MPPT mode, and each module is independently controlled. When each module is switched in or out, the system will fluctuate, affecting the stability of the emergency power supply. Summary of the invention

[0004] The embodiments of the present invention provide an emergency power supply control method, a control terminal and a storage medium to solve the problem in the prior art that the emergency power supply is not stable when the photovoltaic module operates in the MPPT mode.

[0005] In a first aspect, an embodiment of the present invention provides an emergency power supply control method, which is applied to an emergency power supply; the emergency power supply includes: a DC power supply module, an AC power supply module, a photovoltaic module, an energy storage module and an inverter; the output end of the DC power supply module, the output end of the AC power supply module, the output end of the photovoltaic module, the output end of the energy storage module and the input end of the inverter are all connected to a DC bus, and the output end of the inverter is used to supply power to a load;

[0006] The above control method includes:

[0007] Determine whether the DC power module and AC power module are connected to the DC bus;

[0008] If the DC power module is connected to the DC bus, or the AC power module is connected to the DC bus, the PV module is controlled to operate in the maximum power point tracking mode;

[0009] If neither the DC power module nor the AC power module is connected to the DC bus, the PV module is controlled to operate in a constant voltage mode.

[0010] In a second aspect, an embodiment of the present invention provides a control terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the emergency power supply control method provided in the first aspect or any possible implementation method of the first aspect are implemented.

[0011] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the emergency power supply control method provided in the first aspect or any possible implementation method of the first aspect.

[0012] The embodiment of the present invention provides an emergency power supply control method, a control terminal and a storage medium. The method is applied to an emergency power supply; the emergency power supply includes: a DC power supply module, an AC power supply module, a photovoltaic module, an energy storage module and an inverter; the output end of the DC power supply module, the output end of the AC power supply module, the output end of the photovoltaic module, the output end of the energy storage module and the input end of the inverter are all connected to the DC bus, and the output end of the inverter is used to power the load; the control method includes: determining whether the DC power supply module and the AC power supply module are connected to the DC bus; if the DC power supply module is connected to the DC bus, or the AC power supply module is connected to the DC bus, then the photovoltaic module is controlled to operate in the maximum power point tracking mode; if the DC power supply module and the AC power supply module are not connected to the DC bus, then the photovoltaic module is controlled to operate in the constant voltage mode. In the present invention, the photovoltaic module adaptively switches the working mode to achieve smooth switching, thereby improving the stability of the emergency power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a structural schematic diagram of an emergency power supply provided by an embodiment of the present invention;

[0015] Figure 2 This is a flow chart of an implementation of an emergency power supply control method provided by an embodiment of the present invention;

[0016] Figure 3 is a control block diagram of a photovoltaic module provided by an embodiment of the present invention;

[0017] Figure 4 is a control block diagram of an inverter provided by an embodiment of the present invention;

[0018] Figure 5 is an adaptive tracking load line diagram of a photovoltaic module in MPPT mode provided by an embodiment of the present invention;

[0019] Figure 6 is an adaptive tracking load line diagram of a photovoltaic module in CV mode provided by an embodiment of the present invention;

[0020] Figure 7 is an output waveform diagram of an inverter provided by an embodiment of the present invention;

[0021] Figure 8 is a structural schematic diagram of an emergency power supply control device provided by an embodiment of the present invention;

[0022] Fig. 9 is a schematic diagram of a control terminal provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0025] See also Figure 2 , which shows a flowchart of the implementation of the emergency power supply control method provided by an embodiment of the present invention, the emergency power supply control method is applied to the emergency power supply, reference Figure 1 The emergency power supply includes: a DC power module 1, an AC power module 2, a photovoltaic module 3, an energy storage module 4 and an inverter 5; the output end of the DC power module 1, the output end of the AC power module 2, the output end of the photovoltaic module 3, the output end of the energy storage module 4 and the input end of the inverter 5 are all connected to the DC bus, and the output end of the inverter 5 is used to supply power to the load;

[0026] Specifically, the AC power supply module 2 may include: ACDC; the ACDC is connected to a 220V AC power supply, and the ACDC rectifies and transforms the AC power supply into a 15V DC power supply and connects to a DC bus.

[0027] The photovoltaic module 3 may include: a photovoltaic panel PV and a DC-DC; the photovoltaic panel PV outputs a 12V DC, which is converted into a 15V DC by the DC-DC and connected to the DC bus.

[0028] The DC power supply module 1 may include: a 12V DC power supply and a DCDC; the 12V DC power supply is converted into 15V DC power by the DCDC and connected to the DC bus. It should be noted that the photovoltaic panel PV and the DC power supply may also share a three-port DC converter.

[0029] The inverter 5 inverts the 15V DC power into 220V AC power to supply power to the load.

[0030] The energy storage module 4 may be a battery for buffering system power fluctuations.

[0031] The emergency power supply in the embodiment of the present invention is a DC bus-based emergency power supply, which has the source-load plug-and-play capability and is convenient for expansion to multiple source-load coordinated control. However, the DC-based emergency power supply has small inertia and capacity, and disturbances or power mutations can cause DC bus voltage instability, affecting the stability of the emergency system.

[0032] Based on the above problems, an embodiment of the present invention provides an emergency power supply control method, which includes:

[0033] S101: Determine whether the DC power module 1 and the AC power module 2 are connected to the DC bus;

[0034] S102: If the DC power module 1 is connected to the DC bus, or the AC power module 2 is connected to the DC bus, then the photovoltaic module 3 is controlled to operate in the maximum power point tracking mode;

[0035] S103: If the DC power module 1 and the AC power module 2 are not connected to the DC bus, the photovoltaic module 3 is controlled to operate in a constant voltage mode.

[0036] In the embodiment of the present invention, when the DC power module 1 or the AC power module 2 is connected to the DC bus, it means that the voltage of the DC bus is stable. At this time, the photovoltaic module 3 can be controlled to operate in the maximum power point tracking (MPPT) mode to convert solar energy into electrical energy to the maximum extent to obtain the maximum power and improve the working efficiency of the photovoltaic module 3. When the DC power module 1 and the AC power module 2 are not connected, if they are still running in the MPPT mode, the DC bus voltage is unstable. At this time, the photovoltaic module 3 is switched to the constant voltage (CV) mode to stabilize the voltage of the DC bus. The photovoltaic module 3 adaptively switches the working mode according to the power access situation to achieve smooth switching, which effectively improves the stability of the emergency power supply in the whole domain.

[0037] In a possible implementation manner, after S102 and S103, the method may further include:

[0038] S104: Obtaining the current operating parameters of the emergency power supply;

[0039] S105: adjusting the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 according to the operating parameters.

[0040] When the photovoltaic module 3 switches modes, the operation of the entire emergency power supply system will be affected. In the prior art, each module operates independently without considering the mutual influence, which also brings stability problems.

[0041] Based on the above problems, in the embodiment of the present invention, after the mode is switched, the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 are adaptively optimized and adjusted, thereby achieving comprehensive adjustment of each module and improving the global stability of the emergency power supply.

[0042] In a possible implementation, S105 may include:

[0043] S1051: According to the operating parameters, the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 are adjusted in combination with the photovoltaic droop equation and the inverter adaptive equation.

[0044] In a possible implementation, S1051 may include:

[0045] 1. According to the operating parameters, based on the adaptive sliding film control method, the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 are adjusted in combination with the photovoltaic droop equation and the inverter adaptive equation.

[0046] Sliding mode control (SMC) can purposefully change the system's current state (such as deviation and its derivatives) during the dynamic process, forcing the system to move along a predetermined "sliding mode" state trajectory. Adaptive sliding film control combines sliding film control with adaptive control, and adjusts the control parameters according to the error of the sliding film surface to achieve stable control.

[0047] In the embodiment of the present invention, an adaptive sliding film control method is used to adjust the droop coefficient and the control parameters of the inverter 5. The parameter adjustment is reasonable, accurate and fast.

[0048] During the parameter adjustment process, the energy storage module 4 is equivalent to the capacitor C, and the DC bus charging and discharging power P C The calculation formula is:

[0049] P C =P G +P DC +P PV -P load

[0050] Bus voltage U dc It can be expressed as:

[0051]

[0052] According to the above formula, it can be concluded that the capacity of the energy storage module 4 to be configured is related to the fluctuation of the DC bus voltage, and the C value is calculated according to the rated power of each module.

[0053] To facilitate stability analysis, each module is represented as An, the line and network are represented as Bn, then the impedance matrix of each converter port is represented as Ha, the line network node admittance matrix is ​​represented as Hb, and n represents the dimension. Wa and Wb are the input vectors of each subsystem, Xa is the output voltage vector of each subsystem, Xb is the output current vector of each subsystem, and Ca and Cb are the independent signal sources of each subsystem.

[0054] Each matrix H a and H b as follows:

[0055]

[0056] Based on the above, Xa and Xb are obtained to verify the stability.

[0057]

[0058] Among them, the matrix H a H b and H b H a The eigenvalues ​​are the same but the eigenvectors are different. The stability of the eigenvalue loop can be determined based on the Bode diagram.

[0059] In the embodiment of the present invention, the adaptability of each module is enhanced by introducing droop control. Figure 3 The control block diagram of the photovoltaic module 3 is shown. In the MPPT mode, the upper loop is used for control; in the CV mode, the lower loop is used for control.

[0060] In one possible implementation, reference Figure 3 , the photovoltaic droop equation can include:

[0061] U dc =U ref -k1×I o

[0062] Among them, U dc is the DC bus voltage, U ref is the reference voltage, k1 is the droop coefficient of the photovoltaic module 3, I o is the output current of the photovoltaic module 3.

[0063] For the inverter 5, adaptive support voltage and power state need to be considered. Figure 4 The control block diagram of the inverter 5 is shown. dc The power angle ω is combined with the active voltage control parameters and the active frequency control parameters to adjust the active power and support the DC voltage to form a reference phase σ. The voltage reference is constructed by adaptively drooping the reactive power Q combined with the reactive voltage control parameters to form a reference voltage amplitude U m .

[0064] Specifically, in a possible implementation manner, the inverter adaptive equation may include:

[0065] U o =U m sin(σ)

[0066] σ=f(k2,k3)

[0067] U m =f(k4)

[0068] Among them, U o The output voltage of inverter 5, σ is the reference phase of inverter 5, U m is the reference voltage amplitude of the inverter 5; k2 is the active voltage control parameter, k3 is the active frequency control parameter, and k4 is the reactive voltage control parameter.

[0069] In the above inverter adaptive equation, the active voltage control parameter k2 and the active frequency control parameter k3 participate in obtaining the reference phase σ of the inverter 5. The specific block diagram is as follows: Figure 4 As shown, including but not limited to Figure 4 Similarly, the reactive voltage control parameter k4 participates in obtaining the reference voltage amplitude U of the inverter 5. m , the control loop can also be other control loops, including but not limited to Figure 4 Independently adjust U m The reactive power can be regulated, and the active power can be regulated by independently regulating σ, thereby realizing adaptive regulation of the output power of the inverter 5 according to the global state.

[0070] It should be noted that when there are multiple inverters 5, the control loops of each inverter 5 are as follows: Figure 4 shown.

[0071] Further considering the safety of the emergency power supply, when the voltage of the DC bus is too high or too low, it will affect the safety and stability of the emergency power supply. Based on this, in a further implementation, before S101, the above method may also include:

[0072] S106: Obtaining the voltage of the DC bus;

[0073] S107: If the voltage of the DC bus is less than the first preset voltage and greater than the second preset voltage, determining whether the DC power module 1 and the AC power module 2 are connected to the DC bus, and if the DC power module 1 and the AC power module 2 are not connected to the DC bus, controlling the photovoltaic module 3 to operate in a constant voltage mode;

[0074] S108: If the voltage of the DC bus is not less than the first preset voltage, reducing the load of the inverter 5;

[0075] S109: If the voltage of the DC bus is not greater than the second preset voltage, controlling the photovoltaic module 3 to operate in a constant voltage mode;

[0076] Wherein, the first preset voltage is greater than the second preset voltage.

[0077] When the DC bus voltage is within the normal range (second preset voltage to first preset voltage), the mode of the photovoltaic module 3 is normally judged and switched. When the voltage of the DC bus is too high, part of the load can be unloaded to reduce the load and avoid the DC bus voltage being too high to bring safety hazards to the system. When the DC bus voltage is too low, it will also affect the normal operation of the system. At this time, the photovoltaic module 3 can be operated in a constant voltage mode to stabilize the DC bus voltage and avoid the DC bus voltage being unstable, which affects the stability of the emergency power supply.

[0078] Furthermore, based on the above analysis, after the mode switching is performed, the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 can also be adaptively optimized and adjusted.

[0079] Based on this, in a possible implementation manner, the above method may further include:

[0080] S1010: Obtain the current operating parameters of the emergency power supply;

[0081] S1011: adjusting the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 according to the operating parameters.

[0082] As analyzed above, the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 can be adjusted according to the operating parameters. Similarly, the inverter adaptive equation and the photovoltaic droop equation are combined for adjustment, and the specific reference is made to the above embodiment, which will not be repeated here.

[0083] Corresponding to the above embodiment, when the photovoltaic module 3 detects that the DC power module 1 or the AC power module 2 is connected, the DC bus voltage is stable and operates in the MPPT mode; Figure 5 shows the adaptive tracking load line of the photovoltaic module 3 in the MPPT mode; Figure 5It can be seen that the photovoltaic module 3 can adaptively track the load line and has good dynamic performance. When the photovoltaic module 3 detects that there is no DC power module 1 or AC power module 2 connected, it operates in CV mode to stabilize the DC bus voltage; Figure 6 shows the adaptive tracking load line of the photovoltaic module 3 in the CV mode; Figure 6 It can be seen that the photovoltaic module 3 can adaptively stabilize the DC bus voltage and has good current dynamic performance. At the same time, the droop coefficient and the control parameters of the inverter 5 are adaptively adjusted according to the operating parameters. Figure 7 The output waveform of the inverter 5 is shown; the inverter 5 starts in a single cycle when it detects that a load is connected, and when there is no load connected, the grid is operated to support the AC voltage.

[0084] It can be seen from the above that in the embodiment of the present invention, the photovoltaic module 3 adaptively switches the working mode to achieve smooth switching, and adaptively adjusts various control parameters to achieve global stability.

[0085] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0086] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0087] Figure 8 The structure diagram of the emergency power supply control device provided by the embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows:

[0088] Emergency power supply control device is used for emergency power supply; reference Figure 1 The emergency power supply includes: a DC power module 1, an AC power module 2, a photovoltaic module 3, an energy storage module 4 and an inverter 5; the output end of the DC power module 1, the output end of the AC power module 2, the output end of the photovoltaic module 3, the output end of the energy storage module 4 and the input end of the inverter 5 are all connected to the DC bus, and the output end of the inverter 5 is used to supply power to the load;

[0089] refer to Figure 8 , the above-mentioned control device comprises:

[0090] A power supply judgment module 21 is used to determine whether the DC power supply module 1 and the AC power supply module 2 are connected to the DC bus;

[0091] The first control module 22 is used to control the photovoltaic module 3 to operate in the maximum power point tracking mode if the DC power module 1 is connected to the DC bus, or the AC power module 2 is connected to the DC bus;

[0092] The second control module 23 is used to control the photovoltaic module 3 to operate in a constant voltage mode if the DC power module 1 and the AC power module 2 are not connected to the DC bus.

[0093] In a possible implementation manner, the above device may further include:

[0094] A first operating parameter acquisition module, used to acquire the operating parameters of the current emergency power supply;

[0095] The first control parameter adjustment module is used to adjust the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 according to the operating parameters.

[0096] In a possible implementation, the first control parameter adjustment module includes:

[0097] The regulating unit is used to regulate the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 according to the operating parameters in combination with the photovoltaic droop equation and the inverter adaptive equation.

[0098] In a possible implementation, the adjustment unit may be specifically used to adjust the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 according to the operating parameters, based on the adaptive sliding film control method, combined with the photovoltaic droop equation and the inverter adaptive equation.

[0099] In one possible implementation, the photovoltaic droop equation may include:

[0100] U dc =U ref -k1×I o

[0101] Among them, U dc is the DC bus voltage, U ref is the reference voltage, k1 is the droop coefficient of the photovoltaic module 3, I o is the output current of the photovoltaic module 3.

[0102] In a possible implementation, the inverter adaptive equation may include:

[0103] U o =U m sin(σ)

[0104] σ=f(k2,k3)

[0105] U m =f(k4)

[0106] Among them, U o is the output voltage of inverter 5, σ is the reference phase of inverter 5, U mis the reference voltage amplitude of the inverter 5; k2 is the active voltage control parameter, k3 is the active frequency control parameter, and k4 is the reactive voltage control parameter.

[0107] In a possible implementation manner, the above device may further include:

[0108] A bus voltage acquisition module is used to obtain the voltage of the DC bus;

[0109] A third control module is used for, if the voltage of the DC bus is less than the first preset voltage and greater than the second preset voltage, executing the step of determining whether the DC power module 1 and the AC power module 2 are connected to the DC bus, and if the DC power module 1 and the AC power module 2 are not connected to the DC bus, controlling the photovoltaic module 3 to operate in a constant voltage mode;

[0110] A fourth control module, configured to reduce the load of the inverter 5 if the voltage of the DC bus is not less than the first preset voltage;

[0111] A fifth control module, configured to control the photovoltaic module 3 to operate in a constant voltage mode if the voltage of the DC bus is not greater than a second preset voltage;

[0112] Wherein, the first preset voltage is greater than the second preset voltage.

[0113] In a possible implementation manner, the above device may further include:

[0114] A second operating parameter acquisition module is used to obtain the operating parameters of the current emergency power supply;

[0115] The second control parameter adjustment module is used to adjust the droop coefficient of the photovoltaic module 3 and the control parameters of the inverter 5 according to the operating parameters.

[0116] Fig. 9 Schematic diagram of the control terminal 6 provided in the embodiment of the present invention. Fig. 9 As shown, the control terminal 6 of this embodiment includes: a processor 60 and a memory 61. The memory 61 is used to store a computer program 62, and the processor 60 is used to call and run the computer program 62 stored in the memory 61 to perform the steps in the above-mentioned various emergency power supply control method embodiments, such as Figure 2 Alternatively, the processor 60 is used to call and run the computer program 62 stored in the memory 61 to implement the functions of each module / unit in the above-mentioned device embodiments, such as Figure 8 The functions of modules 21 to 23 are shown.

[0117] Exemplarily, the computer program 62 may be divided into one or more modules / units, one or more modules / units are stored in the memory 61 and executed by the processor 60 to implement the present invention. One or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program 62 in the control terminal 6. For example, the computer program 62 may be divided into Figure 8 Modules / units 21 to 23 are shown.

[0118] The control terminal 6 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The control terminal 6 may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art will appreciate that Fig. 9 It is only an example of the control terminal 6 and does not constitute a limitation on the control terminal 6. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal may also include input and output devices, network access devices, buses, etc.

[0119] The processor 60 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0120] The memory 61 may be an internal storage unit of the control terminal 6, such as a hard disk or memory of the control terminal 6. The memory 61 may also be an external storage device of the control terminal 6, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the control terminal 6. Further, the memory 61 may also include both an internal storage unit of the control terminal 6 and an external storage device. The memory 61 is used to store computer programs and other programs and data required by the terminal. The memory 61 may also be used to temporarily store data that has been output or is to be output.

[0121] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0122] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0123] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0124] In the embodiments provided by the present invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0125] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0126] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0127] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0128] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. An emergency power supply control method, characterized in that: Applied to emergency power supply; the emergency power supply comprises: a DC power supply module, an AC power supply module, a photovoltaic module, an energy storage module and an inverter; the output end of the DC power supply module, the output end of the AC power supply module, the output end of the photovoltaic module, the output end of the energy storage module and the input end of the inverter are all connected to the DC bus, and the output end of the inverter is used to supply power to the load; The control method comprises: Determine whether the DC power supply module and the AC power supply module are connected to the DC bus; If the DC power supply module is connected to the DC bus, or the AC power supply module is connected to the DC bus, the photovoltaic module is controlled to operate in a maximum power point tracking mode; If the DC power module and the AC power module are not connected to the DC bus, the photovoltaic module is controlled to operate in a constant voltage mode.

2. The emergency power supply control method according to claim 1, characterized in that: After the steps of controlling the photovoltaic module to operate in a maximum power point tracking mode if the DC power module is connected to the DC bus or the AC power module is connected to the DC bus; and controlling the photovoltaic module to operate in a constant voltage mode if neither the DC power module nor the AC power module is connected to the DC bus, the method further includes: Obtaining the current operating parameters of the emergency power supply; The droop coefficient of the photovoltaic module and the control parameters of the inverter are adjusted according to the operating parameters.

3. The emergency power supply control method according to claim 2, characterized in that: The step of adjusting the droop coefficient of the photovoltaic module and the control parameters of the inverter according to the operating parameters includes: According to the operating parameters, the droop coefficient of the photovoltaic module and the control parameters of the inverter are adjusted in combination with the photovoltaic droop equation and the inverter adaptive equation.

4. The emergency power supply control method according to claim 3, characterized in that: The step of adjusting the droop coefficient of the photovoltaic module and the control parameters of the inverter according to the operating parameters in combination with the photovoltaic droop equation and the inverter adaptive equation includes: According to the operating parameters, based on an adaptive sliding film control method, the droop coefficient of the photovoltaic module and the control parameters of the inverter are adjusted in combination with the photovoltaic droop equation and the inverter adaptive equation.

5. The emergency power supply control method according to claim 3, characterized in that: The photovoltaic droop equation includes: IN dc =U ref -k1×I o Among them, U dc is the DC bus voltage, U ref is the reference voltage, k1 is the droop coefficient of the photovoltaic module, I o is the output current of the photovoltaic module.

6. The emergency power supply control method according to claim 3, characterized in that: The inverter adaptive equation includes: IN o =U m sin(σ) σ=f(k2,k3) U m =f(k4) Among them, U o is the output voltage of the inverter, σ is the reference phase of the inverter, U m is the reference voltage amplitude of the inverter; k2 is the active voltage control parameter, k3 is the active frequency control parameter, and k4 is the reactive voltage control parameter.

7. The emergency power supply control method according to any one of claims 1 to 6, characterized in that: Before determining whether the DC power module and the AC power module are connected to the DC bus, the method further includes: Obtaining the voltage of the DC bus; If the voltage of the DC bus is less than the first preset voltage and greater than the second preset voltage, the step of determining whether the DC power module and the AC power module are connected to the DC bus is performed, until if neither the DC power module nor the AC power module is connected to the DC bus, the step of controlling the photovoltaic module to operate in a constant voltage mode; If the voltage of the DC bus is not less than the first preset voltage, reducing the load of the inverter; If the voltage of the DC bus is not greater than the second preset voltage, controlling the photovoltaic module to operate in a constant voltage mode; Wherein, the first preset voltage is greater than the second preset voltage.

8. The emergency power supply control method according to claim 7, characterized in that: After controlling the photovoltaic module to operate in a constant voltage mode if the voltage of the DC bus is not greater than the second preset voltage, the method further includes: Obtaining the current operating parameters of the emergency power supply; The droop coefficient of the photovoltaic module and the control parameters of the inverter are adjusted according to the operating parameters.

9. A control terminal, characterized in that: The system comprises a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the steps of the emergency power supply control method according to any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the emergency power supply control method as described in any one of claims 1 to 8 are implemented.

Images