Energy management method and apparatus, and system and storage medium

Abstract

An energy management method and apparatus, and a system and a storage medium. The method is applied to an energy circuit comprising an energy management module and an energy storage module, wherein the energy management module comprises at least one boost sub-module and an inverter sub-module connected to the boost sub-module, and the energy storage module comprises at least one of a boost sub-module and a buck sub-module; and each sub-module in the energy management module and the energy storage module includes at least one inductor and a frequency modulation apparatus. The method comprises: when it is detected that a sub-module in an energy circuit is in an abnormal state, selecting at least one sub-module in a normal state; and modulating a driving frequency by means of a frequency modulation apparatus in the selected sub-module in the normal state, such that an inductor in the frequency-modulated sub-module in the normal state vibrates to produce sound.

Description

Energy management method, device, system and storage medium

[0001] This application claims priority to the Chinese patent application filed on March 22, 2024, with application number 202410334162.2 and invention name “A method, device, system and storage medium for energy management”, the contents of which should be understood as incorporated into this application by reference. Technical Field

[0002] The embodiments of the present disclosure relate to, but are not limited to, energy management technology, and in particular to an energy management method, device, system, and storage medium. Background Art

[0003] Alarm control is very important to circuit systems and can provide strong guarantees for the safe and reliable operation of circuit systems.

[0004] In related technologies, the main alarm methods of circuit systems include: sound alarms, light alarms, and message alarms. These all require additional functional modules within the circuit system, increasing the system's size, power consumption, and cost. Furthermore, the warning lights used in light alarms experience light decay and wear over time, affecting the effectiveness of the alarm. Message alarms can be delayed in delivering alarm messages to relevant personnel or equipment due to factors such as network failures and delays.

[0005] Summary of the Invention

[0006] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0007] The present disclosure provides an energy management method, device, system and storage medium.

[0008] The present disclosure provides an energy management method, which is applied to an energy circuit including an energy management module and an energy storage module, wherein the energy management module includes at least one boost submodule and an inverter submodule connected to the boost submodule, and the energy storage module includes at least one of a boost submodule and a buck submodule; each submodule in the energy management module and the energy storage module includes at least one inductor and a frequency modulation device;

[0009] The method includes: after detecting that a submodule in the energy circuit is in an abnormal state, selecting at least one submodule in a normal state; modulating a driving frequency by a frequency modulation device of the selected submodule in a normal state, so that the inductor in the submodule in the normal state with the modulated frequency vibrates and produces sound.

[0010] The technical solution described in the embodiments of the present disclosure utilizes the characteristic that an inductor can make sound at a specific frequency. After detecting that a sub-module in the energy circuit is in an abnormal state, the driving frequency of at least one sub-module in a normal state is modulated to make the inductor in the sub-module make sound. An alarm can be issued through the sound made by the inductor without the need for an additional sound alarm module. The control logic is simple and easy to implement.

[0011] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.

[0012] Summary of the Figures

[0013] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation to the technical solution of the present disclosure.

[0014] FIG1 is a flow chart of an energy management method provided by an embodiment of the present disclosure;

[0015] FIG2 is a schematic diagram of a boost circuit provided by an embodiment of the present disclosure;

[0016] FIG3 is a schematic diagram of a buck circuit provided by an embodiment of the present disclosure;

[0017] FIG4 is a schematic diagram of a bidirectional circuit including a boost circuit and a buck circuit provided by an embodiment of the present disclosure;

[0018] FIG5 is a diagram illustrating an example of the composition of a photovoltaic energy circuit provided by an embodiment of the present disclosure;

[0019] FIG6 is a flow chart of a method for energy management of a photovoltaic energy circuit provided by an embodiment of the present disclosure;

[0020] FIG7 is a structural diagram of an energy management device provided by an embodiment of the present disclosure;

[0021] FIG8 is a structural diagram of an energy management system provided by an embodiment of the present disclosure;

[0022] FIG9 is a structural diagram of an energy circuit provided in an embodiment of the present disclosure.

[0023] Details

[0024] The present disclosure describes a number of embodiments, but this description is exemplary rather than restrictive, and it will be apparent to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present disclosure. Although many possible feature combinations are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0025] The present disclosure includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features, and elements of the present disclosure can be combined with any conventional features or elements to form a unique invention scheme defined by the claims. Any feature or element of any embodiment can be combined with features or elements from other invention schemes to form another unique invention scheme defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this disclosure can be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other limitations. In addition, various modifications and changes can be made within the scope of protection of the attached claims.

[0026] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps in the specific order described. As one of ordinary skill in the art will understand, other orders of steps are possible. Therefore, the specific order of the steps set forth in the specification should not be interpreted as a limitation on the claims. In addition, the claims to the method and / or process should not be limited to performing their steps in the order written, and those skilled in the art can readily understand that these orders can be changed and still remain within the spirit and scope of the disclosed embodiments.

[0027] In order to implement an abnormality alarm in an energy circuit, an embodiment of the present disclosure provides an energy management method. The method can be applied to an energy circuit including an energy management module and an energy storage module. The energy management module includes at least one boost submodule and an inverter submodule connected to the boost submodule. The energy storage module includes at least one of a boost submodule and a buck submodule. Each submodule in the energy management module and the energy storage module includes at least one inductor and a frequency modulation device. The frequency modulation device is used to modulate the driving frequency of the submodule in which it is located. The energy management method, as shown in FIG1 , may include the following steps:

[0028] Step S101 selects at least one submodule in normal state after detecting that a submodule in the energy circuit has an abnormal state; the submodule state abnormality recorded in the embodiment of the present disclosure means that the submodule cannot work normally according to the established design or expectation; the state abnormality may include: fault-level state abnormality and alarm-level state abnormality; for the fault-level state abnormality, not only an alarm is issued, but the energy circuit may also be shut down, such as bus voltage abnormality in the inverter submodule, circuit hardware overcurrent abnormality in the energy storage module, etc.; for the alarm-level state abnormality, the energy circuit may not be shut down, but only an alarm is issued, such as low circuit system-on-chip (SOC) in the energy storage module, photovoltaic fast overcurrent abnormality in the energy management module in the photovoltaic energy circuit, photovoltaic circuit off-grid overcurrent abnormality in the energy management module in the photovoltaic energy circuit, etc.

[0029] In step S102, the frequency modulation device of the selected normal submodule modulates the driving frequency, causing the inductor in the normal submodule with the modulated frequency to vibrate and make sound. The resonant frequency of the inductor is between 20 Hz and 20 kHz. If the operating frequency of the inductor is within this range, the inductor coil will vibrate and make sound under the action of the alternating magnetic field. Because this vibration frequency falls within the hearing range of the human ear, people will hear the inductor making sound, and this phenomenon is called inductor howling.

[0030] The energy management method described in the embodiments of the present disclosure utilizes the characteristic that an inductor can make sound at a specific frequency. After detecting that a sub-module in the energy circuit is in an abnormal state, the driving frequency of at least one sub-module in a normal state is modulated to cause the inductor in the sub-module to make sound. The sound produced by the inductor can be used to issue an alarm without the need for an additional sound alarm module. The control logic is simple and easy to implement.

[0031] Although the inductor can make sound when the modulation frequency is between 20Hz and 20kHz, considering that a higher operating frequency will increase circuit loss and electromagnetic interference (EMI) risk, and a lower operating frequency will reduce the impedance of the inductor, thereby bringing risks caused by increased current in the circuit, in an exemplary embodiment of the present disclosure, the frequency modulation device of the selected normal sub-module modulates the driving frequency, including: modulating the driving frequency of the selected normal sub-module to any frequency between [2k, 4k], thereby achieving inductor sound and reducing adverse effects on circuit performance.

[0032] There are many ways to modulate the driving frequency through the frequency modulation device of the normal submodule, such as making the driving frequency continuously operate at a soundable frequency, or making the driving frequency vary between a soundable frequency and a non-soundable frequency according to a preset rule; or making the driving frequency vary between different frequencies that can occur according to a preset rule. The sound emitted by the inductor vibration in different ways is different. For example, when the driving frequency varies between a soundable frequency and a non-soundable frequency according to a preset rule, people hear the inductor making intermittent sounds; when the driving frequency varies between different soundable frequencies according to a preset rule, people hear the inductor continuously emitting sounds of varying pitches; for example, when the modulated driving frequency is always 3k, a continuous inductor howl is heard; when the modulated driving frequency varies intermittently between 3k and 25k, an intermittent inductor howl is heard.

[0033] In an exemplary embodiment, different modulation drive frequency modes may correspond to different abnormality types. The sounds emitted by the inductive vibrations under different modulation drive frequency modes are different. Therefore, when different modulation drive frequency modes correspond to different abnormality types, people can preliminarily judge the abnormality type by the sound, which helps technicians locate the abnormality as soon as possible.

[0034] The following provides examples of selecting submodules in normal states for different working states of the energy circuit.

[0035] In an exemplary embodiment of the present disclosure, step S101 selects at least one sub-module in a normal state after detecting that a sub-module in the energy circuit is in an abnormal state, including: when the energy circuit is powered on and not running, after detecting that a sub-module in the energy circuit is in an abnormal state, select any sub-module from the sub-modules in a normal state in the energy circuit.

[0036] When the energy circuit is powered on but not running, the submodule in the energy circuit with an abnormal state may be any submodule in the energy management module, or any submodule in the energy storage module, or a submodule in both the energy management module and the energy storage module with an abnormal state; when a submodule in the energy circuit with an abnormal state is detected, any submodule in the normal state can be selected for frequency modulation, so that the inductor in the selected submodule makes a sound and issues an alarm.

[0037] In an exemplary embodiment of the present disclosure, selecting any one submodule from the submodules in the energy circuit that are in normal status includes one or more of the following situations:

[0038] After detecting that the inverter submodule in the energy management module is in an abnormal state, selecting a submodule from at least one boost submodule in the energy management module or any seed module included in the energy storage module as the submodule in a normal state;

[0039] After detecting that the boost submodule in the energy management module is in an abnormal state, determining whether there is still a boost submodule in the energy management module in a normal state, and if so, selecting a submodule from the boost submodule in the energy management module in a normal state, the inverter submodule, or any seed module included in the energy storage module as the submodule in a normal state;

[0040] After detecting that the boost submodule in the energy management module is in an abnormal state, determining whether there is still a boost submodule in the energy management module in a normal state, and if not, selecting a submodule from any seed module included in the inverter submodule or the energy storage module as the submodule in a normal state;

[0041] After detecting that the boost submodule in the energy storage module is in an abnormal state, selecting a submodule from the buck submodule of the energy storage module or any seed module included in the energy management module as the submodule in a normal state;

[0042] After detecting that the buck submodule in the energy storage module is in an abnormal state, a submodule is selected from the boost submodule of the energy storage module or any seed module included in the energy management module as the submodule in a normal state.

[0043] In another exemplary embodiment of the present disclosure, step S101 selects at least one sub-module in normal state after detecting that a sub-module in the energy circuit has an abnormal state, including: when the energy circuit is in a powered-on state, after detecting that a sub-module in the energy circuit has an abnormal state at a fault level, select any sub-module from the sub-modules in normal state in the energy circuit.

[0044] Similar to the above example, any one submodule is selected from the submodules in the energy circuit that are in normal status, including one or more of the following situations:

[0045] After detecting that the inverter submodule in the energy management module has an abnormal state at the fault level, select a submodule from at least one boost submodule in the energy management module or any seed module included in the energy storage module as the submodule in the normal state;

[0046] After detecting that the boost submodule in the energy management module has an abnormal state at the fault level, determining whether there is still a boost submodule in the energy management module in a normal state, and if so, selecting a submodule from the boost submodule in the energy management module in a normal state, the inverter submodule, or any seed module included in the energy storage module as the submodule in a normal state;

[0047] After detecting that the boost submodule in the energy management module has an abnormal state at the fault level, determining whether there is still a boost submodule in the energy management module in a normal state, and if not, selecting a submodule from any seed module included in the inverter submodule or the energy storage module as the submodule in a normal state;

[0048] After detecting that the boost submodule in the energy storage module is in an abnormal state at the fault level, selecting a submodule from the buck submodule of the energy storage module or any seed module included in the energy management module as the submodule in the normal state;

[0049] After detecting that the buck submodule in the energy storage module is in an abnormal state at the fault level, a submodule is selected from the boost submodule of the energy storage module or any seed module included in the energy management module as the submodule in the normal state.

[0050] In another exemplary embodiment of the present disclosure, step S101, after detecting that a submodule in the energy circuit is in an abnormal state, selects at least one submodule in a normal state, including any one or more of the following situations:

[0051] When the energy circuit is powered on and running, after detecting that a submodule in the energy circuit has an abnormal state at the alarm level, the operating state of the energy circuit is judged; it is generally believed that the operating state of the energy circuit includes a grid-connected state or an off-grid state; when the energy circuit is working in the grid-connected state, it means that the electric energy generated by the energy circuit can not only be fed into the public power grid, but also be supplied to local loads; when the energy circuit is working in the off-grid state, it means that the energy circuit operates independently and is not connected to the public power grid; the working modules of the energy circuit are different in different working states, and therefore the submodules that have an abnormal state at the alarm level are also different;

[0052] When it is determined that the operating state of the energy circuit is a grid-connected state and all the boost submodules in the energy management module have an abnormal state at the alarm level, a submodule is selected from the energy storage module as the submodule in a normal state;

[0053] When it is determined that the operating state of the energy circuit is a grid-connected state and not all boost sub-modules in the energy management module have an alarm-level abnormal state, a sub-module is selected from the boost sub-modules in the energy management module that are in a normal state as the sub-module in a normal state.

[0054] Exemplarily, when the energy management module includes a boost submodule, the energy circuit is powered on and operates in a grid-connected state, and it is determined that the boost submodule in the energy management module has an alarm-level abnormality, a submodule is selected from the energy storage module for drive frequency modulation. When the energy management module includes at least two boost submodules, the energy circuit is powered on and operates in a grid-connected state, and it is determined that only one boost submodule in the energy management module has an alarm-level abnormality, a submodule is selected from the normal boost submodules in the energy management module for drive frequency modulation. Theoretically, when a boost submodule has an abnormality, in addition to modulating the drive frequency of the normal boost submodule, the drive frequency of the energy storage module can also be modulated. However, considering that the current in the boost submodule is unidirectional while the current in the energy storage module is bidirectional, modulating the drive frequency of the boost submodule is technically simpler to implement.

[0055] Exemplarily, when the energy management module includes at least two boost sub-modules, the energy circuit is powered on and operates in a grid-connected state, and it is determined that all boost sub-modules in the energy management module have an alarm-level abnormal state, a sub-module is selected from the energy storage module for driving frequency modulation.

[0056] In another exemplary embodiment of the present disclosure, step S101, after detecting that a submodule in the energy circuit is in an abnormal state, selects at least one submodule in a normal state, including any one or more of the following situations:

[0057] When the energy circuit is powered on and running, after detecting that a submodule in the energy circuit has an abnormal state at an alarm level, determining the operating state of the energy circuit;

[0058] When it is determined that the operating state of the energy circuit is an off-grid state and the inverter submodule in the energy management module has an alarm-level abnormal state, a submodule is selected from the boost submodules in the energy management module that are in a normal state as the submodule in a normal state;

[0059] When it is determined that the operating state of the energy circuit is an off-grid state and the submodule in the energy storage module has an alarm-level abnormal state, select a submodule from the boost submodules in the energy management module that are in a normal state as the submodule in a normal state;

[0060] When it is determined that the operating state of the energy circuit is an off-grid state and all the boost submodules in the energy management module have an abnormal state at the alarm level, select a submodule from the energy storage module as the submodule in the normal state;

[0061] When it is determined that the operating state of the energy circuit is off-grid and not all boost sub-modules in the energy management module have an alarm-level abnormal state, a sub-module is selected from the boost sub-modules in the energy management module that are in normal state as the sub-module in normal state.

[0062] In an exemplary embodiment of the present disclosure, selecting a submodule from the normal boost submodules in the energy management module includes: selecting a boost submodule with minimum operating power and normal status from the energy management module as the normal submodule.

[0063] In the embodiment of the present disclosure, when there are multiple boost submodules in normal states whose driving frequencies can be modulated, the driving frequency of the boost submodule with the smallest operating power is selected for modulation, which can reduce the difficulty of modulating the driving frequency and thus reduce the difficulty of implementing alarm control.

[0064] In an exemplary embodiment of the present disclosure, the boost submodule may include a boost circuit. FIG2 is a schematic diagram of a boost circuit. A boost circuit is a DC-DC converter that can increase its input voltage to a higher output voltage level. In the boost circuit, the inductor L is an energy storage element that stores energy when the switch device is closed and releases energy when the switch device is open. The transistor Q is a switching device that is configured to control the flow of current. When the current flows, the inductor charges. When the current is blocked, the inductor discharges to the load and output capacitor through the diode. The diode is configured to prevent reverse current flow during discharge, ensuring that the current can only flow in one direction, thereby protecting the circuit. The capacitor C at the output end is configured to smooth the output voltage, reduce voltage fluctuations, and provide a stable DC output. The IC circuit is configured to perform pulse width modulation (PWM) control. By adjusting the duty cycle of the switch (i.e., the ratio of the time the switch is closed to the time it is open), the charging and discharging time of the inductor L is controlled, thereby adjusting the output voltage. Vo = Vi / (1-Duty), where Duty is the duty cycle, Vo represents the output voltage, and Vi represents the input voltage.

[0065] In an exemplary embodiment of the present disclosure, the step-down submodule may include a buck circuit. FIG3 is a schematic diagram of a buck buck circuit. The buck buck circuit can convert a higher DC input voltage into a lower DC output voltage. It is based on the principle of inductive energy storage and realizes the step-down function by controlling the on and off current of the switch tube Q, the inductor L and the capacitor C. When the switch tube Q is turned on, the current flows through the switch tube through the inductor L, and the inductor L stores energy and outputs it through the capacitor C to provide energy to the load; when the switch tube Q is turned off, the energy stored in the inductor L flows to the output terminal and the filter capacitor through the diode D, thereby maintaining the output voltage stable; the IC circuit can control the output voltage by adjusting the duty cycle of the switch tube (i.e., the ratio of the on time to the cycle); the larger the duty cycle, the higher the output voltage; the smaller the duty cycle, the lower the output voltage, Vo=Vi*Duty, Duty is the duty cycle, Vo represents the output voltage, and Vi represents the input voltage.

[0066] In an exemplary embodiment of the present disclosure, a bidirectional circuit comprising a boost circuit and a buck circuit is also provided, as shown in Figure 4. When the bidirectional circuit is configured in boost mode, a boost conversion is achieved by connecting an inductor L and a diode D in series. During this process, the inductor stores energy and releases it to the output terminal through the diode when the switch Q is disconnected, thereby achieving an output voltage higher than the input voltage. When the bidirectional circuit is configured in buck mode, the energy storage and release of the inductor L is controlled by adjusting the duty cycle of the switch Q, so that the output voltage is lower than the input voltage. Vo = Vi * Duty / (1-Duty), where Duty is the duty cycle, Vo represents the output voltage, and Vi represents the input voltage.

[0067] In an exemplary embodiment of the present disclosure, the inverter submodule may include at least one of a three-phase inverter drive circuit and a single-phase inverter drive circuit. The three-phase inverter drive circuit converts DC power into three-phase AC power. Compared to the three-phase inverter drive circuit, the single-phase inverter drive circuit processes a single-phase voltage, making its design and construction process simpler. Due to its simple structure, the use of a single-phase inverter drive circuit can reduce manufacturing costs.

[0068] Figure 5 shows an example of a photovoltaic energy circuit, which includes an energy management module and an energy storage module (i.e., the energy storage converter in the figure). The energy management module includes two boost submodules and two inverter submodules, one of which includes a three-phase inverter drive circuit and the other includes a single-phase inverter drive circuit. The energy storage module includes a boost submodule and a buck submodule. The energy management module and the energy storage module are coupled together via a DC bus. A DC bus is a conductive device primarily configured to transmit and distribute DC power. When exposed to sunlight, the photovoltaic array converts solar energy into DC power. This DC power passes through the boost submodule and is then connected to the DC bus. The DC bus then transmits the DC power to the inverter submodule, which converts the DC power into AC power to meet the needs of the AC load. The DC power is also connected to an energy storage module, such as a battery pack, via the DC bus for energy storage and management.

[0069] When the photovoltaic energy circuit is powered on and operates in a grid-connected state, and it is determined that an alarm-level abnormal state occurs in one boost submodule in the energy management module, the driving frequency of another boost submodule in the energy management module is modulated.

[0070] When the photovoltaic energy circuit is powered on and operates in a grid-connected state, and it is determined that both of the two boost submodules in the energy management module have an alarm-level abnormal state, the driving frequency of the boost submodule or the buck submodule in the energy storage module is modulated.

[0071] When the photovoltaic energy circuit is powered on and operates in an off-grid state, and it is determined that an alarm-level abnormal state occurs in the inverter submodule in the energy management module, the driving frequency of a boost submodule in the energy management module is modulated.

[0072] When the photovoltaic energy circuit is powered on and operates in an off-grid state, and it is determined that an alarm-level abnormal state occurs in one boost submodule in the energy management module, the driving frequency of another boost submodule in the energy management module is modulated.

[0073] When the photovoltaic energy circuit is powered on and operates in an off-grid state, and it is determined that both of the two boost submodules in the energy management module are in an abnormal state of an alarm level, the driving frequency of the boost submodule or the buck submodule in the energy storage module is modulated.

[0074] When the photovoltaic energy circuit is powered on and operates in an off-grid state, and it is determined that the energy storage module is abnormal in an alarm level, the driving frequency of a boost submodule in the energy management module is modulated.

[0075] The energy management method described in the above embodiment of the present disclosure will be exemplarily described below by taking the photovoltaic energy circuit described in FIG5 as an example and referring to FIG6 .

[0076] After the photovoltaic energy circuit starts to be powered on, it is determined whether the photovoltaic energy circuit has a state abnormality, wherein the state abnormality includes an alarm-level state abnormality and a fault-level state abnormality.

[0077] In the event that an abnormal state occurs in the photovoltaic energy circuit, the sub-modules in normal state and the sub-modules in abnormal state are determined, and the driving frequency of at least one sub-module in normal state is modulated; when the driving frequency after modulation is determined, the voltage duty cycle Duty is adjusted according to the different requirements of the input voltage and output voltage to ensure that the entire photovoltaic energy circuit is stable in standby mode and no new abnormalities are generated.

[0078] When there is no abnormality in the photovoltaic energy circuit, the photovoltaic energy circuit startup phase is entered.

[0079] After the photovoltaic energy circuit is in operation, priority is given to stabilizing the DC bus to ensure the voltage stability of the DC bus.

[0080] The photovoltaic energy circuit is charged and discharged. In the charging state, photovoltaics charge the batteries in the energy storage module. In the discharging state, the batteries discharge to the load first.

[0081] Continue to determine whether the photovoltaic energy circuit has an abnormal state. When the photovoltaic energy circuit has an abnormal state at the fault level, shut down the photovoltaic energy circuit and modulate the driving frequency of at least one sub-module in normal state. When the driving frequency after modulation is determined, adjust the voltage duty cycle Duty according to the different requirements of the input voltage and the output voltage to ensure that the entire photovoltaic energy circuit is stable in standby mode and no new abnormalities will occur.

[0082] When an alarm-level abnormality occurs in the photovoltaic energy circuit, it is distinguished whether the photovoltaic energy circuit is currently in an off-grid state or a grid-connected state. Different sub-modules have different alarm-level abnormalities in different network states. In each network state, at least one sub-module in a normal state is selected to modulate the drive frequency.

[0083] In the grid-connected state, when one boost submodule in the energy management module is in an abnormal state (i.e., one photovoltaic line is in an abnormal state), the driving frequency of the other boost submodule in the energy management module that is in a normal state is modulated; when both boost submodules in the energy management module are in abnormal states (i.e., both photovoltaic lines are abnormal), the driving frequency of any submodule in the energy storage module is modulated.

[0084] In the off-grid state, when the inverter submodule is in an abnormal state, the driving frequency of a boost submodule in the energy management module that is in a normal state and has the lowest working power is modulated; when the state of a boost submodule in the energy management module is abnormal, the driving frequency of another boost submodule in the energy management module that is in a normal state is modulated; when both boost submodules in the energy management module are in an abnormal state, the driving frequency of any submodule in the energy storage module is modulated; when the energy storage module is abnormal, the driving frequency of a boost submodule in the energy management that is in a normal state and has the lowest working power is modulated.

[0085] An embodiment of the present disclosure further provides a computer-readable storage medium, which stores one or more programs. The one or more programs can be executed by one or more processors to implement the energy management method as described in any of the previous embodiments.

[0086] An embodiment of the present disclosure also provides an energy management device, as shown in Figure 7, which includes: a memory 701, configured to store computer program instructions of the sub-module as the normal state; a processor 702, configured to execute the computer executable instructions to implement the energy management method as described in any of the previous embodiments.

[0087] The embodiment of the present disclosure further provides an energy management system, as shown in FIG8 , which includes: an energy circuit 801 , and an energy management device 802 as described in the previous embodiment, which is electrically connected to the energy circuit 801 .

[0088] Exemplarily, the structure of the energy circuit 801 is shown in FIG9 , and the energy circuit 801 includes: an energy management module 8011 and an energy storage module 8012 connected via a busbar; exemplary, the energy circuit 801 may be a photovoltaic energy circuit.

[0089] The energy management module 8011 is configured to manage and optimize the electrical energy of the entire energy circuit; the energy management module 8011 includes at least one boost submodule 80111 and an inverter submodule 80112 connected to the boost submodule; wherein, the boost submodule 80111 is configured to increase the output voltage, and the boost submodule can achieve voltage increase through inductance, switching devices, diodes and control logic; the inverter submodule 80112 is configured to convert direct current into alternating current, and the embodiment of the present disclosure can support multiple types of inverters.

[0090] The energy storage module 8012 is a device that connects the battery pack, the power grid or the load, and is configured to store electrical energy. The energy storage module described in the embodiment of the present disclosure supports bidirectional energy storage, that is, it can receive electrical energy from the battery pack and supply it to the power grid or the load, and it can also receive electrical energy from the power grid and store it in the battery pack. The energy storage module 8012 includes at least one of a boost submodule and a buck submodule.

[0091] Each submodule in the energy management module 8011 and the energy storage module 8012 in the embodiment of the present disclosure includes at least one inductor and a frequency modulation device.

[0092] The energy management device 802 is configured to detect whether a submodule in the energy circuit 801 is in an abnormal state, and after detecting that a submodule in the energy circuit 801 is in an abnormal state, select at least one submodule in a normal state; modulate the driving frequency through the frequency modulation device of the selected submodule in a normal state, so that the inductance in the submodule in a normal state of the modulated frequency vibrates and makes a sound; the energy management device 802 can be connected to the processor of the frequency modulation device in each submodule, and can continue to use the original processor during operation, and the abnormal alarm function can be achieved by only changing the modulation frequency.

[0093] The energy management system described in the embodiments of the present disclosure utilizes the characteristic that an inductor can make sound at a specific frequency. After detecting that a sub-module in the energy circuit is in an abnormal state, the driving frequency of at least one sub-module in a normal state is modulated to make the inductor in the sub-module make sound. An alarm can be issued through the sound made by the inductor, without the need for an additional sound alarm module, thereby reducing the complexity of the circuit system and simplifying implementation.

[0094] In an exemplary embodiment, the energy management device 802 is configured to select at least one normal submodule after detecting an abnormal state of a submodule in the energy circuit by one or more of the following methods:

[0095] When the energy circuit is powered on but not running, after detecting that a submodule in the energy circuit is in an abnormal state, selecting any submodule from the submodules in the energy circuit that are in normal state;

[0096] When the energy circuit is powered on and an abnormal state of a submodule in the energy circuit at a fault level is detected, any submodule in the normal state of the energy circuit is selected.

[0097] In an exemplary embodiment, the energy management device 802 is configured to select any sub-module from the sub-modules in the energy circuit that are in normal state by one or more of the following methods:

[0098] After detecting that the inverter submodule in the energy management module has an abnormal state at the fault level, select a submodule from at least one boost submodule in the energy management module or any seed module included in the energy storage module as the submodule in the normal state;

[0099] After detecting that the boost submodule in the energy management module has an abnormal state at the fault level, determining whether there is still a boost submodule in the energy management module in a normal state, and if so, selecting a submodule from the boost submodule in the energy management module in a normal state, the inverter submodule, or any seed module included in the energy storage module as the submodule in a normal state;

[0100] After detecting that the boost submodule in the energy management module has an abnormal state at the fault level, determining whether there is still a boost submodule in the energy management module in a normal state, and if not, selecting a submodule from any seed module included in the inverter submodule or the energy storage module as the submodule in a normal state;

[0101] After detecting that the boost submodule in the energy storage module is in an abnormal state at the fault level, selecting a submodule from the buck submodule of the energy storage module or any seed module included in the energy management module as the submodule in the normal state;

[0102] After detecting that the buck submodule in the energy storage module is in an abnormal state at the fault level, a submodule is selected from the boost submodule of the energy storage module or any seed module included in the energy management module as the submodule in the normal state.

[0103] In another exemplary embodiment, the energy management device 802 is configured to select at least one normal submodule after detecting an abnormal state of a submodule in the energy circuit by one or more of the following methods:

[0104] When it is determined that the power-on operation state of the energy circuit is a grid-connected state, and all the boost submodules in the energy management module have an abnormal state at the alarm level, a submodule is selected from the energy storage module as the submodule in the normal state;

[0105] When it is determined that the power-on operation state of the energy circuit is a grid-connected state, and not all boost submodules in the energy management module have an abnormal state at the alarm level, selecting a submodule from the boost submodules in the energy management module that are in a normal state as the submodule in a normal state;

[0106] When it is determined that the power-on operating state of the energy circuit is an off-grid state, and the inverter submodule in the energy management module has an alarm-level abnormal state, a submodule is selected from the boost submodules in the energy management module that are in a normal state as the submodule in a normal state;

[0107] When it is determined that the power-on operating state of the energy circuit is an off-grid state and a submodule in the energy storage module has an alarm-level abnormal state, a submodule is selected from the boost submodules in the energy management module that are in a normal state as the submodule in a normal state;

[0108] When it is determined that the power-on operation state of the energy circuit is an off-grid state, and all the boost submodules in the energy management module have an abnormal state at the alarm level, selecting a submodule from the energy storage module as a normal submodule in the state;

[0109] When it is determined that the power-on operating state of the energy circuit is an off-grid state, and not all boost sub-modules in the energy management module have an alarm-level abnormal state, a sub-module is selected from the normal boost sub-modules in the energy management module as the normal sub-module.

[0110] In an exemplary embodiment of the present disclosure, the energy management device is configured to select a submodule from the boost submodules in the energy management module that are in a normal state as the submodule in a normal state in the following manner: a boost submodule with the lowest operating power and normal state is selected from the energy management module as the submodule in a normal state.

[0111] In the embodiment of the present disclosure, when there are multiple boost submodules in normal states whose driving frequencies can be modulated, the driving frequency of the boost submodule with the smallest operating power is selected for modulation, which can reduce the difficulty of modulating the driving frequency and thus reduce the difficulty of implementing alarm control.

[0112] In an exemplary embodiment of the present disclosure, the boost submodule may include a boost circuit. FIG3 is a schematic diagram of a boost circuit.

[0113] In an exemplary embodiment of the present disclosure, the step-down submodule may include a buck circuit. FIG4 is a schematic diagram of a buck step-down circuit.

[0114] In an exemplary embodiment of the present disclosure, a bidirectional circuit including a boost circuit and a buck circuit is provided, as shown in FIG5 . The bidirectional circuit can be configured in a boost mode or a buck mode.

[0115] In an exemplary embodiment of the present disclosure, the inverter submodule may include at least one of a three-phase inverter drive circuit and a single-phase inverter drive circuit. The three-phase inverter drive circuit converts DC power into three-phase AC power. Compared to the three-phase inverter drive circuit, the single-phase inverter drive circuit processes a single-phase voltage and has a simpler structure, which simplifies its design and construction. Due to its simple structure, the use of a single-phase inverter drive circuit can reduce manufacturing costs.

[0116] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by multiple physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As is well known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable, and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media generally embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. An energy management method, the method being applied to an energy circuit comprising an energy management module and an energy storage module, the energy management module comprising at least one boost submodule and an inverter submodule connected to the boost submodule, the energy storage module comprising at least one of a boost submodule and a buck submodule; Each submodule in the energy management module and the energy storage module includes at least one inductor and a frequency modulation device; The method comprises: After detecting that a submodule in the energy circuit is in an abnormal state, selecting at least one submodule in a normal state; The frequency modulation device of the selected normal submodule modulates the driving frequency, so that the inductor in the normal submodule with the modulated frequency vibrates and produces sound.

2. The method according to claim 1, wherein After detecting that a submodule in the energy circuit is in an abnormal state, selecting at least one submodule in a normal state includes: When the energy circuit is powered on but not running, after detecting that a sub-module in the energy circuit is in an abnormal state, any sub-module is selected from the sub-modules in the energy circuit that are in a normal state; or, when the energy circuit is powered on and running, after detecting that a sub-module in the energy circuit is in a fault-level abnormal state, any sub-module is selected from the sub-modules in the energy circuit that are in a normal state.

3. The method according to claim 2, wherein: The selecting any one sub-module from the sub-modules in the energy circuit that are in normal state includes: After detecting that the inverter submodule in the energy management module is in an abnormal state, a submodule is selected from at least one boost submodule in the energy management module or any seed module included in the energy storage module as the submodule in a normal state.

4. The method according to claim 2, wherein: The selecting any one sub-module from the sub-modules in the energy circuit that are in normal state includes: After detecting that the boost submodule in the energy management module is in an abnormal state, determine whether there is still a boost submodule in the energy management module in a normal state; if so, select a submodule from the boost submodule in the energy management module in a normal state, the inverter submodule, or any seed module included in the energy storage module as the submodule in a normal state; if not, select a submodule from the inverter submodule or any seed module included in the energy storage module as the submodule in a normal state.

5. The method according to claim 2, wherein: The selecting any one sub-module from the sub-modules in the energy circuit that are in normal state includes: After detecting that the boost submodule in the energy storage module is in an abnormal state, a submodule is selected from the buck submodule of the energy storage module or any seed module included in the energy management module as the submodule in a normal state.

6. The method according to claim 2, wherein: The selecting any one sub-module from the sub-modules in the energy circuit that are in normal state includes: After detecting that the buck submodule in the energy storage module is in an abnormal state, a submodule is selected from the boost submodule of the energy storage module or any seed module included in the energy management module as the submodule in a normal state.

7. The method according to claim 1, wherein After detecting that a submodule in the energy circuit is in an abnormal state, selecting at least one submodule in a normal state includes: When the energy circuit is powered on and running, after detecting that a submodule in the energy circuit has an abnormal state at an alarm level, determining the operating state of the energy circuit; When it is determined that the operating state of the energy circuit is a grid-connected state and all the boost sub-modules in the energy management module have an alarm-level abnormal state, a sub-module is selected from the energy storage module as the sub-module in the normal state; or, when it is determined that the operating state of the energy circuit is a grid-connected state and not all the boost sub-modules in the energy management module have an alarm-level abnormal state, a sub-module is selected from the boost sub-modules in the energy management module that are in the normal state as the sub-module in the normal state.

8. The method according to claim 1, wherein After detecting that a submodule in the energy circuit is in an abnormal state, selecting at least one submodule in a normal state includes: When the energy circuit is powered on and running, after detecting that a submodule in the energy circuit has an abnormal state at an alarm level, determining the operating state of the energy circuit; When it is determined that the operating state of the energy circuit is off-grid and the inverter submodule in the energy management module has an alarm-level abnormal state, a submodule is selected from the boost submodules in the energy management module that are in normal state as the submodule in normal state.

9. The method according to claim 1, wherein After detecting that a submodule in the energy circuit is in an abnormal state, selecting at least one submodule in a normal state includes: When the energy circuit is powered on and running, after detecting that a submodule in the energy circuit has an abnormal state at an alarm level, determining the operating state of the energy circuit; When it is determined that the operating state of the energy circuit is off-grid and the submodule in the energy storage module has an alarm-level abnormal state, a submodule is selected from the normal boost submodules in the energy management module as the normal submodule.

10. The method according to claim 1, wherein After detecting that a submodule in the energy circuit is in an abnormal state, selecting at least one submodule in a normal state includes: When the energy circuit is powered on and running, after detecting that a submodule in the energy circuit has an abnormal state at an alarm level, determining the operating state of the energy circuit; When it is determined that the operating state of the energy circuit is an off-grid state and all the boost sub-modules in the energy management module have an alarm-level abnormal state, a sub-module is selected from the energy storage module as the sub-module in the normal state; or, when it is determined that the operating state of the energy circuit is an off-grid state and not all the boost sub-modules in the energy management module have an alarm-level abnormal state, a sub-module is selected from the boost sub-modules in the energy management module that are in the normal state as the sub-module in the normal state.

11. The method according to claim 7, 8, 9 or 10, wherein: The selecting a submodule from the boost submodules in the energy management module that are in a normal state as the submodule in a normal state includes: A boost submodule with the minimum operating power and normal status is selected from the energy management module as the submodule in normal status.

12. The method according to claim 1, wherein There are multiple ways to modulate the driving frequency by the frequency modulation device of the submodule in the normal state. Different ways of modulating the driving frequency correspond to different types of abnormalities, and the sounds emitted by the inductor vibration under different ways of modulating the driving frequency are different. The modulating the driving frequency by the frequency modulation device of the selected submodule in the normal state includes: modulating the driving frequency of the selected submodule in the normal state to any frequency between [2k, 4k].

13. A non-transitory computer-readable storage medium storing one or more program instructions, wherein the one or more program instructions can be executed by one or more processors to implement the energy management method according to any one of claims 1 to 12.

14. An energy management device, comprising: a memory configured to store computer program instructions executable on the processor; A processor is configured to execute the computer program instructions to implement the energy management method according to any one of claims 1 to 12.

15. An energy management system, comprising: An energy circuit electrically connected to each other and an energy management device as claimed in claim 14; The energy circuit includes an energy management module and an energy storage module connected by a busbar; wherein the energy management module includes at least one boost submodule and an inverter submodule connected to the boost submodule; the energy storage module includes at least one submodule of a boost submodule and a buck submodule; each submodule in the energy management module and the energy storage module includes at least one inductor and a frequency modulation device.

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