Off-grid system, energy management method, device, equipment and medium

Abstract

The invention provides an off-grid system, an energy management method, an energy management device, energy management equipment and a medium, the method is applied to the off-grid system, and the off-grid system comprises a power generation assembly, a load assembly and an energy storage assembly; specifically, the method comprises the following steps: when the residual energy storage margin of an energy storage assembly is less than a first value, obtaining the current generation power and load power of the off-grid system; according to the generated power and the load power, the off-grid output voltage is adjusted to charge the energy storage assembly until the remaining energy storage margin reaches a second value; the off-grid output voltage is the voltage provided by the off-grid system to the load assembly, and the second value is greater than the first value. The method is used for improving the operation stability and reliability of the off-grid system.

Description

Technical Field

[0001] The present application relates to photovoltaic energy storage technology, and in particular to an off-grid system and energy management method, device, equipment, and medium. Background Art

[0002] An off-grid system is a power system that operates independently of the power grid, and is usually used to convert renewable energy (such as solar or wind energy) into usable direct current or alternating current to meet the power needs of a specific location. When the photovoltaic storage inverter is operating off-grid, it is disconnected from the power grid, which is also equivalent to an off-grid system.

[0003] It is understandable that, affected by the properties of renewable energy, the characteristics of electricity demand, etc., the off-grid system needs to reasonably allocate energy to effectively maintain the stability of the off-grid system. Specifically, the energy management of the off-grid system can be simplified into three states dominated by power generation components, energy storage components and load components. The execution process is generally as follows: when the power generation component has output, in order to fully absorb the generated power, the system operation is dominated by the power generation component, and the load component consumes and the energy storage component absorbs the excess generated power; when the power generation component has no output, the system operation is dominated by the load component, and the energy storage component outputs the electric energy required by the load component; when there is neither power generation nor load demand power, the system operation is dominated by the energy storage component to maintain the basic operation of the system.

[0004] Based on the above energy management process, when the off-grid system encounters insufficient energy supply, there is no effective control strategy to extend the off-grid operation time. Summary of the invention

[0005] The present application provides an off-grid system and an energy management method, device, equipment, and medium, which are used to extend the system operation time when the off-grid system is short of energy, so as to improve the stability and reliability of the off-grid system.

[0006] In a first aspect, the present application provides an energy management method, which is applied to an off-grid system; the off-grid system includes a power generation component and an energy storage component, and the off-grid system is used to provide electrical energy to a load component; the method includes:

[0007] When the remaining energy storage margin of the energy storage component is less than a first value, obtaining the current power generation power and load power of the off-grid system;

[0008] According to the generated power and the load power, the off-grid output voltage is adjusted to charge the energy storage component until the remaining energy storage margin reaches a second value; the off-grid output voltage is the voltage provided by the off-grid system to the load component, and the second value is greater than the first value.

[0009] In another possible implementation manner, adjusting the off-grid output voltage according to the generated power and the load power includes:

[0010] When the generated power satisfies the i-th preset condition, the off-grid output voltage is adjusted according to the preset rule corresponding to the i-th preset condition to reduce the off-grid load power; the i-th preset condition includes: generated power∈(J i+1 × Load power, J i × load power], J i+1 , J i are all values ​​greater than zero and less than 1, i is an integer greater than 0, and accordingly, the preset rules include: adjusted off-grid output voltage = K i × Rated voltage, K i A value greater than zero and less than 1.

[0011] In another possible implementation, the off-grid system further includes a photovoltaic inverter; and adjusting the off-grid output voltage according to the generated power and the load power includes:

[0012] When the generated power satisfies the i-th preset condition, the bus voltage of the photovoltaic inverter is adjusted according to the preset rule corresponding to the i-th preset condition to adjust the off-grid output voltage; the i-th preset condition includes: generated power∈(J i+1 × Load power, J i × load power], J i+1 , J i are all values ​​greater than zero and less than 1, i is an integer greater than 0, and accordingly, the preset rules include: adjusted bus voltage = K i × Initial bus voltage, K i is a value greater than zero and less than 1; the off-grid output voltage is correlated with the bus voltage of the photovoltaic inverter.

[0013] In another possible implementation, the method further includes:

[0014] Obtaining a load priority of each load in the load component, wherein the load priority is related to a power usage attribute of the load;

[0015] Determine the critical load in the load component according to the load priority, and determine J according to the critical load i and K i The value of .

[0016] In another possible implementation, adjusting the off-grid output voltage to charge the energy storage component according to the generated power and the load power until the remaining energy storage margin reaches a second value includes:

[0017] According to the generated power and the load power, the off-grid output voltage is adjusted to obtain an adjusted off-grid output voltage;

[0018] Based on the adjusted off-grid output voltage, the adjusted off-grid load power is determined to determine the surplus power generation power; the surplus power generation power is related to the power generation power and the adjusted off-grid load power, and the surplus power generation power is used to charge the energy storage component until the remaining energy storage margin reaches the second value.

[0019] In another possible implementation, the method further includes:

[0020] When the remaining energy storage margin of the energy storage component is less than a third value, and / or the generated power is less than a preset power, the off-grid system enters a preset state; the third value is less than the first value, and the preset state includes: charging the energy storage component based on the generated power.

[0021] In a second aspect, the present application provides an energy management device, which is applied to an off-grid system; the off-grid system includes a power generation component and an energy storage component, and the off-grid system is used to provide electrical energy to a load component; the device includes:

[0022] An acquisition module, used for acquiring the current power generation power and load power of the off-grid system when the remaining energy storage margin of the energy storage component is less than a first value;

[0023] A management module is used to adjust the off-grid output voltage to charge the energy storage component according to the generated power and the load power until the remaining energy storage margin reaches a second value; the off-grid output voltage is the voltage provided by the off-grid system to the load component, and the second value is greater than the first value.

[0024] In a third aspect, the present application provides an electronic device, including: at least one processor and a memory;

[0025] The memory stores computer-executable instructions;

[0026] The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the method as described in any one of the first aspects above.

[0027] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a central processing unit, they are used to implement the method described in any one of the first aspects above.

[0028] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a central processing unit, implements the method described in any one of the first aspects.

[0029] In a sixth aspect, the present application provides an off-grid system, the system comprising a power generation component, an energy storage component, and the electronic device as described in the third aspect.

[0030] The present application provides an off-grid system and energy management method, device, equipment, and medium, wherein the method of the present application is applied to an off-grid system; specifically, the method in the present application is executed by any electronic device, and when the remaining energy storage margin of the energy storage component is less than a first value, the electronic device obtains the current power generation power and load power of the off-grid system, and adjusts the off-grid output voltage according to the power generation power and load power to charge the energy storage component until the remaining energy storage margin reaches a second value. Through the method of the present application, before the energy of the off-grid system is about to be exhausted, the load consumption can be reduced in time, and a part of the power generation power can be saved for charging the energy storage component, so that the energy storage component can continue to supply power when necessary, and the operation time of the off-grid system can be extended, which is conducive to improving the operation stability and reliability of the off-grid system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] Figure 1 An example diagram of energy management in a known technology provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of an application scenario of an energy management method provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of an energy management method provided in an embodiment of the present application Figure 1 ;

[0035] Figure 4 A schematic diagram of an energy management method provided in an embodiment of the present application Figure 2 ;

[0036] Figure 5 An example of an energy management method provided in the present application Figure 1 ;

[0037] Figure 6 An example of an energy management method provided in the present application Figure 2 ;

[0038] Figure 7An example diagram of adjusting off-grid output voltage provided in an embodiment of the present application;

[0039] Figure 8 A schematic diagram of the structure of an energy management device provided in an embodiment of the present application;

[0040] Fig. 9 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 701. boost circuit; 702. photovoltaic inverter.

[0043] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0045] The off-grid system is an independent power system that combines renewable energy generation technology and energy storage technology. It is mainly used in scenarios that do not rely on the public power grid or where the power grid environment is poor. When the photovoltaic storage inverter is running off-grid, it is disconnected from the power grid, which is also equivalent to an off-grid system.

[0046] Specifically, the off-grid system usually includes power generation components, energy storage components, controllers, etc., which are used to convert renewable energy (such as solar energy or wind energy) into usable direct current or alternating current to meet the power demand of load components at specific locations. Exemplarily, the off-grid solar storage inverter system is used to convert solar energy into usable alternating current.

[0047] It is understandable that the availability and capacity of renewable energy are limited, and electricity demand may fluctuate at different times of the day. Affected by similar properties of renewable energy and characteristics of electricity demand, off-grid systems need to reasonably allocate energy to effectively utilize renewable energy and ensure that the system has a longer operating time.

[0048] At present, the energy management of off-grid systems can be simplified into three states dominated by power generation components, energy storage components and load components. Taking the photovoltaic energy storage inverter off-grid system as an example, Figure 1 An example diagram of energy management in a known technology provided in an embodiment of the present application is shown in FIG. Figure 1 As shown in the figure, the energy management process of the photovoltaic energy storage inverter off-grid system is as follows: pv When it is greater than zero, that is, when the photovoltaic module has output, in order to fully absorb the photovoltaic power generation power P pv The system operation is dominated by the photovoltaic components, the load components consume, and the energy storage components absorb the excess photovoltaic power. At this time, the current theoretical power of the energy storage component is P bat =P pv -P load , where P load is the current load power; when the photovoltaic power generation power P pv Not greater than zero and P load When it is greater than zero, that is, the PV module has no output but the load module is running, the system operation is dominated by the load module, and the energy storage module outputs the electric energy required by the load module, that is, P bat =-P load ; When there is neither photovoltaic power generation nor load power demand, the system operation is dominated by the energy storage component, P bat Used to maintain basic system operation.

[0049] It can be seen that in the above energy management process, only the stable operation of the off-grid system when the energy is sufficient is considered. For boundary conditions such as insufficient and limited power generation power or energy storage power, that is, when the off-grid system has insufficient energy supply, the system will stop running, which is not conducive to extending the system's operating time, and thus is not conducive to ensuring system stability and reliability.

[0050] Therefore, the present application provides an off-grid system and energy management method, device, equipment, and medium, which are used to adjust the off-grid output voltage when the energy storage surplus of the off-grid system is about to be exhausted, and use the surplus power generated after the adjustment to charge the energy storage component, so that the energy storage component can continue to provide electrical energy, thereby extending the operating time of the off-grid system and improving the stability and reliability of the off-grid system.

[0051] Figure 2 A schematic diagram of an application scenario of an energy management method provided in an embodiment of the present application, such as Figure 2 As shown, the energy management method of the present application can be applied to any off-grid system. Figure 2As shown, the off-grid system includes a controller, a power generation component and an energy storage component; the off-grid system can provide power to the load component and maintain the stable operation of the system itself according to the energy control strategy. Among them, the method of the present application is executed by the controller, and when the controller detects that the energy storage margin of the off-grid system is less than the first value, the controller obtains the current power generation power and load power of the off-grid system. Furthermore, the controller adjusts the off-grid output voltage according to the power generation power and the load power to save part of the power generation power, and uses it to charge the energy storage component until the energy storage margin reaches the second value. It can be understood that the second value is greater than the first value.

[0052] Through the above-mentioned arrangement, when the energy storage surplus of the off-grid system is about to be exhausted, the off-grid output voltage can be reduced to save part of the generated power, and the saved generated power can be used to charge the energy storage component, that is, part of the generated power can be allocated to the energy storage component in time, so that the off-grid system can recover part of the energy in time when the energy storage surplus is about to be exhausted, thereby extending the operating time of the off-grid system and improving the stability and reliability of the off-grid system.

[0053] It can be understood that the method of the present application can also be executed by any other electronic device, as long as the electronic device can interact with the components of the off-grid system to realize the monitoring of the generated power, load power, etc., the control of the off-grid output voltage, etc., which is not limited in this embodiment.

[0054] In the following, some embodiments of the present application are described in detail in conjunction with the accompanying drawings. In the case where the embodiments do not conflict with each other, the following embodiments and features in the embodiments can be combined with each other.

[0055] The present application provides an energy management method, which is applied to any off-grid system. The off-grid system includes a power generation component and an energy storage component. The off-grid system can provide electrical energy to a load component. Figure 3 A schematic diagram of an energy management method provided in an embodiment of the present application Figure 1 ,like Figure 3 As shown, the method provided in this embodiment includes:

[0056] S301, when the remaining energy storage margin of the energy storage component is less than a first value, obtaining the current power generation power and load power of the off-grid system.

[0057] It can be understood that in this embodiment, the energy storage component of the off-grid system is equipped with a battery management unit, which monitors the remaining energy storage remainder of the energy storage component. The electronic device obtains the current energy storage remainder by interacting with the battery management unit in real time or periodically, and determines whether the remaining energy storage remainder of the energy storage component is less than the first value by comparing the current energy storage remainder with the first value.

[0058] Specifically, in this embodiment, the first value is 5%. When the remaining energy storage margin obtained by the battery management unit is less than 5%, the electronic device obtains the current power generation power and load power of the off-grid system.

[0059] Among them, in this embodiment, the electronic device obtains the current power generation and load power through the data acquisition unit set with the off-grid system. Specifically, the off-grid system is also provided with a plurality of sensors, and the data acquisition unit is used to integrate the data from each sensor to determine the power generation and load power of the off-grid system at a certain moment. It can be understood that the plurality of sensors include one or more of a current sensor, a voltage sensor, a power meter, etc., which is not limited in this embodiment.

[0060] Optionally, in practical applications, the off-grid system may also obtain the remaining energy storage margin of the energy storage component by setting a status monitoring instrument, etc. Further, the status monitoring instrument or the battery management unit compares the remaining energy storage margin with the first value in real time, and when the remaining energy storage margin is less than the first value, sends a signal to the electronic device indicating that the remaining energy storage margin is less than the first value, so that the electronic device determines whether the remaining energy storage margin of the energy storage component is less than the first value. In this embodiment, the manner in which the electronic device determines whether the remaining energy storage margin of the energy storage component is less than the first value is not limited.

[0061] In addition, in practical applications, the first value can also be set to 6% or 4%, etc., which is not limited in this embodiment, as long as it is greater than the minimum protection value. At the same time, it should be understood that the first value should not be too large to avoid affecting the normal operation of the load component.

[0062] S302, adjusting the off-grid output voltage to charge the energy storage component according to the generated power and the load power, until the remaining energy storage margin reaches a second value.

[0063] The off-grid output voltage is the voltage provided by the off-grid system to the load component, and the second value is greater than the first value.

[0064] In this embodiment, the electronic device combines the current power generation power and load power to determine to what extent the current off-grid output voltage should be reduced to reduce the load demand power, saving a portion of the power generation power for charging the energy storage component until the remaining energy storage margin reaches a second value.

[0065] Specifically, in this embodiment, the electronic device adjusts the off-grid output voltage through the inverter provided in the off-grid system, and uses pulse width modulation (PWM) technology to achieve this. Specifically, by changing the duty cycle of the PWM signal, the effective value of the output voltage can be adjusted, that is, the off-grid output voltage can be adjusted. In practical applications, the electronic device can also adjust the off-grid output voltage by controlling a transformer or a voltage stabilizer in the off-grid system, which is not limited in this embodiment. For example, for an off-grid system including an inverter, the electronic device can indirectly adjust the off-grid output voltage by adjusting the bus voltage of the inverter through a power conversion circuit provided in the off-grid system.

[0066] In this embodiment, the second value is set to 15%. When the electronic device charges the energy storage component based on the saved part of the generated power, when the remaining energy storage margin reaches 15%, it stops charging the energy storage component and uses all the generated power for the load component, so that the off-grid system resumes normal operation.

[0067] It is understandable that in practical applications, the second value may also be set to 16% or 14%, which is not limited in this embodiment. Generally, the difference between the first value and the second value is not less than 10%.

[0068] In the method provided in this embodiment, when the remaining energy storage margin of the energy storage component is less than the first value, the electronic device obtains the current power generation power and load power of the off-grid system. Further, based on the current power generation power and load power of the off-grid system, the electronic device adjusts the off-grid output voltage to reduce the off-grid load power, so that part of the power generation power can be used to charge the energy storage component until the remaining energy storage margin of the energy storage component reaches the second value.

[0069] Through the method of this embodiment, when the remaining energy storage margin of the energy storage component is about to be exhausted, the electronic device can charge the energy storage component in time to restore the energy storage component to the second value, and can take over the power generation component to lead the operation of the off-grid system when necessary to ensure the stability and reliability of the operation of the off-grid system.

[0070] In one possible design, Figure 4 A schematic diagram of an energy management method provided in an embodiment of the present application Figure 2 Based on the above embodiments, this embodiment describes in detail the process of adjusting the off-grid output voltage and charging the energy storage component in the above embodiments. Figure 4 As shown, the method of this embodiment includes:

[0071] S401, when the generated power satisfies the i-th preset condition, adjusting the off-grid output voltage according to a preset rule corresponding to the i-th preset condition to obtain an adjusted off-grid output voltage.

[0072] Among them, the i-th preset condition includes: power generation power∈(J i+1 × Load power, J i × load power], J i+1 , J i are all values ​​greater than zero and less than 1, i is an integer greater than 0, and accordingly, the preset rules include: adjusted off-grid output voltage = K i × Rated voltage, K i A value greater than zero and less than 1.

[0073] Specifically, in this embodiment, the electronic device determines J according to the key load in the load component. i The key load in the load component is determined according to the load priority of each load in the load component, and the load priority is related to the power consumption attribute of the load. For example, the load in the load component that cannot be powered off and has a higher minimum required voltage has a higher corresponding load priority. i and K i When adjusting, the off-grid side output voltage should not be lower than the minimum required voltage of the critical load.

[0074] Through the above arrangement, the off-grid output voltage adjusted by the electronic equipment can ensure the stable operation of each key load in the load component.

[0075] Optionally, in actual applications, the user may set J based on experience. i and K i and input the corresponding value into the electronic device, which is not limited in this embodiment.

[0076] In this embodiment, when the remaining energy storage margin of the energy storage component is less than the first value, the electronic device adjusts the off-grid output voltage to K in sections according to the relationship between the generated power and the load power. i times the rated voltage to achieve the purpose of reducing load consumption.

[0077] Specifically, the electronic device determines whether the generated power and the load power meet the i-th preset condition, that is, the generated power∈(J i+1 × Load power, J i × load power], accordingly, when the power generation power and the load power meet the i-th preset condition, the off-grid output voltage is adjusted according to the preset rule corresponding to the i-th preset condition, that is, the off-grid output voltage is adjusted to K i × rated voltage. It is understandable that J i+1 <J i .

[0078] For example, if the power generated by the electronic device is P pv , the load power is Pload , and the electronic device determines J2×P load <P pv ≤J1×P load , the electronic device adjusts the off-grid output voltage to K1 times the rated voltage.

[0079] Furthermore, if the load included in the load assembly is regarded as purely resistive, when the off-grid output voltage is adjusted to K1 times the rated voltage, the off-grid load power can be regarded as reduced by (1-K1) times P load The saved power is used to charge the energy storage components to accumulate energy.

[0080] Optionally, in actual applications, the electronic device may also adjust the off-grid output voltage in other ways. For example, when the power generation power and load power at a certain moment meet the i-th preset condition, the electronic device may reduce the off-grid output voltage to a preset multiple of the rated rule. This is not limited in the present embodiment.

[0081] S402, determining an adjusted off-grid load power based on the adjusted off-grid output voltage to determine the surplus generated power.

[0082] The surplus power generation is related to the power generation and the adjusted off-grid load power, and the surplus power generation is used to charge the energy storage component until the remaining energy storage margin reaches a second value.

[0083] In this embodiment, after obtaining the adjusted off-grid output voltage, the electronic device can interact with a power meter or a data acquisition unit provided in the off-grid system to determine the adjusted off-grid load power. Optionally, in practical applications, the electronic device can also calculate the adjusted off-grid load power based on the adjusted off-grid output voltage, which is not limited in this embodiment.

[0084] Further, after obtaining the off-grid load power, the electronic device makes a difference between the generated power and the off-grid load power to obtain the surplus generated power, and the surplus generated power is used to charge the energy storage component until the remaining energy storage margin of the energy storage component reaches the second value. Optionally, in practical applications, the electronic device may also adjust the off-grid output voltage and obtain the current off-grid load power, multiply the off-grid load power by 1.1 to obtain the target off-grid load power, and further make a difference between the generated power and the target off-grid load power to obtain the surplus generated power. Alternatively, when the electronic device adjusts the off-grid output voltage and obtains the off-grid load power, it makes a difference between the generated power and the off-grid load power to obtain the power difference, and further multiplies the power difference by 0.9 to obtain the surplus generated power to ensure that the load of the load component can run. In this embodiment, the method for determining the surplus generated power is not limited, as long as the surplus generated power is related to the generated power and the adjusted off-grid load power.

[0085] In the method provided in this embodiment, the electronic device can adaptively adjust the off-grid output voltage based on the relationship between load power and power generation, so as to reasonably save surplus power generation for charging the energy storage component, so that the energy storage component can extend the operating time of the off-grid system when necessary, thereby ensuring the stability and reliability of the off-grid system operation.

[0086] Optionally, in practical applications, in order to charge the energy storage component more quickly, the electronic device may also continuously reduce the off-grid output voltage to make the remaining energy storage margin reach the second value. Specifically, when the electronic device adjusts the off-grid output voltage, it adjusts the off-grid output voltage once at a preset time interval according to the generated power and the load power to charge the energy storage component until the remaining energy storage margin reaches the second value.

[0087] It is understandable that when the electronic device executes the above process, it is necessary to ensure that the load assembly does not include voltage-sensitive loads, or that the off-grid output voltage is not lower than the minimum voltage required by the voltage-sensitive loads.

[0088] In another possible design, for the inverter off-grid system, in the inverter, there is a clear relationship between the off-grid output voltage and the bus voltage of the inverter. Therefore, as a possible implementation method, when the generated power meets the i-th preset condition, the electronic device adjusts the bus voltage of the photovoltaic inverter according to the preset rule corresponding to the i-th preset condition to adjust the off-grid output voltage.

[0089] Specifically, the i-th preset condition includes: power generation power∈(J i+1 × Load power, J i × load power], J i+1 , J i are all values ​​greater than zero and less than 1, i is an integer greater than 0, and accordingly, the preset rules include: adjusted bus voltage = K i × Initial bus voltage; there is a correlation between the off-grid output voltage and the bus voltage of the photovoltaic inverter. It can be understood that J i and K i The value of is also determined based on the load of the load component.

[0090] For example, for a T-type three-level three-phase inverter, the electronic device can modulate it based on the space vector pulse width modulation SVPWM technology. Specifically, the bus voltage V bus With off-grid output voltage V eps The explicit relationship is expressed as: Based on this relationship, when the bus voltage is adjusted, the off-grid output voltage will change simultaneously, thereby achieving the purpose of indirectly adjusting the off-grid output voltage by adjusting the bus voltage.

[0091] Optionally, in practical applications, the electronic device may also adjust the off-grid output voltage based on other clear relationships related to the off-grid output voltage, which is not limited in this embodiment.

[0092] Through the above settings, the bus voltage can be adjusted to a voltage close to the required output voltage, so there is no need for redundant design of the inverter, reducing the complexity and cost of the inverter, and reducing the voltage stress of the switching devices inside the inverter, which is conducive to improving the reliability and service life of the inverter. In addition, the voltage conversion of the bus voltage on the DC side is conducive to making the energy conversion efficiency of the entire system higher, thereby having a better dynamic response.

[0093] Further, in the present application, when the remaining energy storage margin of the energy storage component is less than a third value, and / or when the generated power is less than a preset power, the electronic device causes the off-grid system to enter a preset state. Wherein, the third value is less than the first value, and the preset state includes: charging the energy storage component based on the generated power.

[0094] Specifically, the third value is a protection value of the off-grid system. In this embodiment, the third value is specifically 3%. In practical applications, the third value may also be 4% or 2%, which is not limited in this embodiment. Accordingly, this embodiment does not limit the preset power, for example, it may be 90%.

[0095] Through the above settings, when the energy of the off-grid system is about to fall below the protection value, and when the generated power is less than the preset power, the electronic equipment can promptly abandon the demand for the load component and try to charge the energy storage component to maintain the energy storage margin of the energy storage component. On the one hand, it can avoid over-discharge of the energy storage component, thereby effectively protecting the energy storage component. On the other hand, it can enable the off-grid system to promptly transmit alarms or other necessary data to the upper-level monitoring system or user when necessary, so that the off-grid system has the ability to recover again.

[0096] As an example, for a photovoltaic storage inverter off-grid system, in a possible implementation, a flag is set in an electronic device to indicate the operating status of the photovoltaic storage inverter off-grid system. Specifically, when the remaining energy storage margin of the energy storage component is less than the second value, the electronic device sets the flag to a first preset value, and when the remaining energy storage margin of the energy storage component is not less than the second value, the flag is set to a second preset value. It can be understood that the first preset value is 0 and the second preset value is 1. In actual applications, the first preset value may also be 1 and the second preset value may be 0, which is not limited in this example.

[0097] Based on this setting, Figure 5 An example of an energy management method provided in the present application Figure 1 ,like Figure 5 As shown, after the electronic device starts to run, it first determines whether the remaining energy storage margin of the energy storage component is greater than the second value. If so, it indicates that the off-grid system has entered a normal operating state, and the flag is set to the second preset value; if not, the flag is set to the first preset value, and further determines whether the remaining energy storage margin is less than the third value; at this time, if the energy storage margin is less than the third value, the off-grid system enters a preset state, otherwise, it is further determined whether the remaining energy storage margin is less than the first value, or whether the flag is the first preset value. If so, the flag is kept at the first preset value, and it is further determined whether the generated power and the load power meet the i-th preset condition. If so, the off-grid output voltage is adjusted based on the preset rule corresponding to the i-th preset condition until the remaining energy storage margin is not less than the first value, and the flag is the second preset value, and the off-grid system enters a normal operating state. Otherwise, it means that the generated power is less than the preset power, and the off-grid system enters a preset state.

[0098] Figure 6 An example of an energy management method provided in the present application Figure 2 ,like Figure 6 As shown, after the electronic device starts to run, it first determines whether the remaining energy storage margin of the energy storage component is greater than the second value. If so, it indicates that the off-grid system enters a normal operating state, and the flag is set to the second preset value; if not, the flag is set to the first preset value, and further determines whether the remaining energy storage margin is less than the third value; at this time, if the energy storage margin is less than the third value, the off-grid system enters a preset state, otherwise, it is further determined whether the remaining energy storage margin is less than the first value, or whether the flag is the first preset value. If so, the flag is kept at the first preset value, and it is further determined whether the generated power and the load power meet the i-th preset condition. If so, the bus voltage is adjusted based on the preset rule corresponding to the i-th preset condition to achieve the adjustment of the off-grid output voltage, until the remaining energy storage margin is not less than the first value, and the flag is the second preset value, the off-grid system enters a normal operating state. Otherwise, it means that the generated power is less than the preset power, and the off-grid system enters a preset state.

[0099] Accordingly, Figure 7 An example diagram of adjusting the off-grid output voltage provided in an embodiment of the present application is shown in FIG. Figure 7As shown, for the photovoltaic storage inverter off-grid system, it includes a power conversion circuit boost circuit 701 and a photovoltaic inverter 702, and the electronic device adjusts the off-grid output voltage through the bus voltage Vbus. Specifically, the electronic device adjusts the bus voltage by adjusting the switch tube of the boost circuit 701 so that the boost circuit outputs the corresponding voltage, that is, the off-grid output voltage is adjusted. It can be understood that when the off-grid system enters the preset state, it can be achieved by controlling the relay in the diagram.

[0100] Understandably, Figure 7 In the figure, PV+ and PV- are connected to the photovoltaic components of the photovoltaic storage inverter off-grid system, and LOAD is used to represent the load components of the photovoltaic storage inverter off-grid system.

[0101] Optional, for Figure 7 In the photovoltaic energy storage inverter off-grid system shown, the electronic device can also directly adjust the off-grid output voltage by adjusting the switch tube in the photovoltaic inverter 702.

[0102] Through the above process, when necessary, the remaining energy storage margin of the energy storage component can form a hysteresis loop between the first value and the second value, so that the off-grid system will resume normal operation only when the remaining energy storage margin reaches the second value, avoiding the off-grid system from stopping operation.

[0103] The above-mentioned embodiment introduces an energy management method from the perspective of method flow, and the following embodiment introduces an energy management device from the perspective of a virtual module or a virtual unit. Please refer to the following embodiment for details.

[0104] An embodiment of the present application provides an energy management device, which is applied to an off-grid system; the off-grid system includes a power generation component, a load component and an energy storage component. Figure 8 A schematic diagram of the structure of an energy management device provided in an embodiment of the present application is shown in FIG. Figure 8 As shown, the device includes an acquisition module 81 and a management module 82, wherein:

[0105] An acquisition module 81, used for acquiring the current power generation power and load power of the off-grid system when the remaining energy storage margin of the energy storage component is less than a first value;

[0106] The management module 82 is used to adjust the off-grid output voltage to charge the energy storage component according to the generated power and the load power until the remaining energy storage margin reaches a second value; the off-grid output voltage is the voltage provided by the off-grid system to the load component, and the second value is greater than the first value.

[0107] In another possible implementation of the embodiment of the present application, the management module 82 is specifically used to:

[0108] When the generated power meets the i-th preset condition, the off-grid output voltage is adjusted according to the preset rule corresponding to the i-th preset condition to reduce the off-grid load power; the i-th preset condition includes: generated power∈(J i+1 × Load power, J i × load power], J i+1 , J i are all values ​​greater than zero and less than 1, i is an integer greater than 0, and accordingly, the preset rules include: adjusted off-grid output voltage = K i × Rated voltage, K i A value greater than zero and less than 1.

[0109] In another possible implementation of the embodiment of the present application, the off-grid system further includes a photovoltaic inverter; the management module 82 is specifically used for:

[0110] When the generated power meets the i-th preset condition, the bus voltage of the photovoltaic inverter is adjusted according to the preset rule corresponding to the i-th preset condition to adjust the off-grid output voltage; the i-th preset condition includes: generated power∈(J i+1 × Load power, J i × load power], J i+1 , J i are all values ​​greater than zero and less than 1, i is an integer greater than 0, and accordingly, the preset rules include: adjusted bus voltage = K i × Initial bus voltage, K i It is a value greater than zero and less than 1; the off-grid output voltage is correlated with the bus voltage of the photovoltaic inverter.

[0111] In another possible implementation manner of the embodiment of the present application, the management module 82 is further configured to:

[0112] Obtain the load priority of each load in the load component. The load priority is related to the power consumption attribute of the load.

[0113] Determine the critical loads in the load components according to the load priority, and determine J according to the critical loads. i and K i The value of .

[0114] In another possible implementation manner of the embodiment of the present application, the management module 82 is specifically used to:

[0115] According to the generated power and the load power, the off-grid output voltage is adjusted to obtain an adjusted off-grid output voltage;

[0116] Based on the adjusted off-grid output voltage, the adjusted off-grid load power is determined to determine the surplus power generation power; the surplus power generation power is related to the power generation power and the adjusted off-grid load power, and the surplus power generation power is used to charge the energy storage component until the remaining energy storage margin reaches a second value.

[0117] In another possible implementation of the embodiment of the present application, the management module 82 is further configured to:

[0118] When the remaining energy storage margin of the energy storage component is less than a third value, and / or the generated power is less than a preset power, the off-grid system enters a preset state; the third value is less than the first value, and the preset state includes: charging the energy storage component based on the generated power.

[0119] An energy management device provided in an embodiment of the present application is applicable to the above-mentioned method embodiment and will not be described in detail here.

[0120] An electronic device is provided in an embodiment of the present application. Fig. 9 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown in FIG. Fig. 9 As shown, Fig. 9 The electronic device shown includes: a processor 91 and a memory 92. The processor 91 and the memory 92 are connected, such as through a bus 93. Optionally, the electronic device may further include a transceiver 94. It should be noted that in actual applications, the transceiver 94 is not limited to one, and the structure of the electronic device does not constitute a limitation on the embodiments of the present application.

[0121] The processor 91 may be a central processing unit (CPU), a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor 91 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0122] The bus 93 may include a path to transmit information between the above components. The bus 93 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus 93 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig. 9 Only one thick line is used in the figure, but it does not mean that there is only one bus 93 or only one type of bus 93.

[0123] The memory 92 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited to these.

[0124] The memory 92 is used to store the application code for executing the solution of the present application, and the execution is controlled by the processor 91. The processor 91 is used to execute the application code stored in the memory 92 to implement the contents shown in the above method embodiment.

[0125] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used to implement the methods in the above-mentioned embodiments.

[0126] A computer program product is also provided in an embodiment of the present application, including a computer program. When the computer program is executed by a processor, the technical solution of the above-mentioned method embodiment is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0127] An off-grid system is also provided in an embodiment of the present application. The off-grid system includes a power generation component, an energy storage component, and the electronic device in the aforementioned embodiment.

[0128] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims.

[0129] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. An energy management method, characterized in that: Applied to an off-grid system; the off-grid system comprises a power generation component and an energy storage component, and the off-grid system is used to provide electrical energy to a load component; the method comprises: When the remaining energy storage margin of the energy storage component is less than a first value, obtaining the current power generation power and load power of the off-grid system; According to the generated power and the load power, the off-grid output voltage is adjusted to charge the energy storage component until the remaining energy storage margin reaches a second value; the off-grid output voltage is the voltage provided by the off-grid system to the load component, and the second value is greater than the first value.

2. The method according to claim 1, characterized in that The step of adjusting the off-grid output voltage according to the generated power and the load power comprises: When the generated power satisfies the i-th preset condition, the off-grid output voltage is adjusted according to the preset rule corresponding to the i-th preset condition to reduce the off-grid load power; the i-th preset condition includes: generated power∈(J i+1 × Load power, J i × load power], J i+1 , J i are all values ​​greater than zero and less than 1, i is an integer greater than 0, and accordingly, the preset rules include: adjusted off-grid output voltage = K i × Rated voltage, K i A value greater than zero and less than 1.

3. The method according to claim 1, characterized in that The off-grid system further includes a photovoltaic inverter; and adjusting the off-grid output voltage according to the generated power and the load power includes: When the generated power satisfies the i-th preset condition, the bus voltage of the photovoltaic inverter is adjusted according to the preset rule corresponding to the i-th preset condition to adjust the off-grid output voltage; the i-th preset condition includes: generated power∈(J i+1 × Load power, J i × load power], J i+1 , J i are all values ​​greater than zero and less than 1, i is an integer greater than 0, and accordingly, the preset rules include: adjusted bus voltage = K i × Initial bus voltage, K i is a value greater than zero and less than 1; the off-grid output voltage is correlated with the bus voltage of the photovoltaic inverter.

4. The method according to claim 2 or 3, characterized in that: The method further comprises: Obtaining a load priority of each load in the load component, wherein the load priority is related to a power usage attribute of the load; Determine the critical load in the load component according to the load priority, and determine J according to the critical load i and K i The value of .

5. The method according to any one of claims 1 to 3, characterized in that: The step of adjusting the off-grid output voltage to charge the energy storage component according to the generated power and the load power until the remaining energy storage margin reaches a second value includes: According to the generated power and the load power, the off-grid output voltage is adjusted to obtain an adjusted off-grid output voltage; Based on the adjusted off-grid output voltage, the adjusted off-grid load power is determined to determine the surplus power generation power; the surplus power generation power is related to the power generation power and the adjusted off-grid load power, and the surplus power generation power is used to charge the energy storage component until the remaining energy storage margin reaches the second value.

6. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: When the remaining energy storage margin of the energy storage component is less than a third value, and / or the generated power is less than a preset power, the off-grid system enters a preset state; the third value is less than the first value, and the preset state includes: charging the energy storage component based on the generated power.

7. An energy management device, characterized in that: Applicable to an off-grid system; the off-grid system comprises a power generation component and an energy storage component, and the off-grid system is used to provide electrical energy to a load component; the device comprises: An acquisition module, used for acquiring the current power generation power and load power of the off-grid system when the remaining energy storage margin of the energy storage component is less than a first value; A management module is used to adjust the off-grid output voltage to charge the energy storage component according to the generated power and the load power until the remaining energy storage margin reaches a second value; the off-grid output voltage is the voltage provided by the off-grid system to the load component, and the second value is greater than the first value.

8. An electronic device, characterized in that: include: at least one processor and memory; The memory stores computer-executable instructions; The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 6 when executed by a central processing unit.

10. An off-grid system, characterized in that: The system comprises a power generation component, an energy storage component, and the electronic device as claimed in claim 8.

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