Load identification system and control method thereof, microgrid control device

Abstract

The application discloses a load identification system and a control method thereof and a microgrid control device. The method comprises: at least one socket; a plurality of electrical loads, wherein each electrical load is connected to a DC bus through the socket; a voltage and current sensing module arranged at a port of the DC bus and used for collecting voltage and current information when the plurality of electrical loads use electric energy; and a control circuit connected with the voltage and current sensing module and the socket respectively, and used for identifying electric energy use information of each electrical load based on the voltage and current information and load power characteristics. The application solves the technical problem that in the related art, when a large number of high-precision sensors are used to identify electrical loads in a microgrid system, the identification accuracy is reduced due to external influences.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of load control, in particular to a load identification system, a control method thereof and a micro-grid control device. BACKGROUND

[0002] In the related art, in a direct current micro-grid system, load identification technology is generally analyzed and distinguished through active power, reactive power and harmonics of the load. The active power is used for load identification, which is faster and more convenient. Therefore, the direct current micro-grid system provides a good application scenario for this technology. However, the current load identification technology is realized through an intrusive load monitoring method. This method needs to consume a large number of high-precision sensors, and as long as any sensor has a problem, it will affect the load identification result, which is easy to cause the identification accuracy to be reduced. To solve this problem, a non-intrusive charge decomposition technology is proposed. A set of voltage and current sensors are installed at the input port of the building power supply to decompose the running status of all loads. This technology has two directions to be realized. The load decomposition is realized by using the characteristics that the power is constant when the load is stable. Or the load discrimination is realized by using the power characteristic curve at the moment when the load is turned on.

[0003] At present, no effective solution has been proposed for the above problems. SUMMARY

[0004] The embodiments of the present application provide a load identification system, a control method thereof and a micro-grid control device to at least solve the technical problem that the identification accuracy is reduced due to external influence when a large number of high-precision sensors are used to identify electrical appliance loads in a micro-grid system in the related art.

[0005] According to an aspect of the embodiments of the present application, a load identification system is provided, comprising: at least one socket; a plurality of electrical appliance loads, wherein each of the electrical appliance loads is connected to a direct current bus through the socket; a voltage and current sensing module arranged at a port of the direct current bus, used to collect voltage and current information when the electrical appliance loads use electric energy; and a control circuit connected with the voltage and current sensing module and the socket respectively, used to identify electric energy use information of each of the electrical appliance loads based on the voltage and current information and load power characteristics.

[0006] Optionally, each of the sockets comprises at least a first relay and a second relay, wherein a coil side of the first relay is connected to a positive electrode of the direct current bus, and a contact side of the first relay is connected with a switch quantity detection module of the control circuit; a contact side of the second relay is connected to the positive electrode of the direct current bus, and a coil side of the second relay is connected with a switch quantity control module of the control circuit.

[0007] Optionally, the control circuit comprises: a switch quantity detection module connected to the contact side of the first relay in each socket; and a switch quantity control module connected to the coil side of the second relay in each socket.

[0008] Optionally, the control circuit further comprises a sampling module connected to the voltage and current sensing module, configured to collect the voltage and current information at a preset sampling frequency and convert the collected voltage and current information into power information.

[0009] Optionally, the control circuit further comprises an appliance feature storage configured to store the load power features of each appliance load.

[0010] Optionally, the control circuit further comprises: a load decomposition module connected to the sampling module and the appliance feature storage, configured to determine the target appliance load corresponding to the power information to be identified based on the power information and the load power features; and an information processing module configured to analyze the power usage information of the target appliance load based on the switch quantity information collected by the switch quantity detection module.

[0011] Optionally, the load identification system further comprises a display configured to display the power usage information processed by the information processing module in a preset display mode.

[0012] Optionally, the load identification system further comprises a terminal connected to the display and configured to receive the power usage information.

[0013] Optionally, the load identification system further comprises a cloud server connected to the appliance feature storage and configured to transmit the power features of different appliance loads to the appliance feature storage.

[0014] Optionally, the plurality of appliance loads comprise an induction cooker, a television, a washing machine, and an air conditioner.

[0015] According to another aspect of the embodiments of the present application, a control method of a load identification system is also provided, which is applied to any of the above load identification systems, and the control method comprises: receiving the load power features of all appliance loads; collecting voltage and current information and switch quantity information when the appliance loads in the current area use power; analyzing a target appliance load corresponding to the voltage and current information based on the voltage and current information and the load power features; and analyzing power usage information of the target appliance load based on the switch quantity information.

[0016] Optionally, the power usage information at least comprises load power consumption information, load start time, load stop time, and load position.

[0017] Optionally, after analyzing the power consumption information of the target electrical load, the control method further comprises: analyzing whether the power consumption proportion in the current area exceeds a preset proportion threshold based on the load power consumption information; if the power consumption proportion in the current area exceeds the preset proportion threshold, disconnecting the preset electrical load; and sending a system load height warning and a load closing suggestion list to the user terminal.

[0018] According to another aspect of the embodiments of the present application, a micro-grid control device is also provided, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the control method of the load identification system according to any one of the above aspects via execution of the executable instructions.

[0019] According to another aspect of the embodiments of the present application, a computer readable storage medium is also provided, comprising a stored computer program, wherein the computer readable storage medium performs the control method of the load identification system according to any one of the above aspects when the computer program is running.

[0020] In the embodiments of the present application, each electrical load is connected to a DC bus through a socket, voltage and current information of the electrical load when using power is collected by a voltage and current sensing module, and power consumption information of each electrical load is identified based on the voltage and current information and load power characteristics by a control circuit. In the embodiments, the real-time running conditions and specific positions of all electrical loads in the DC micro-grid can be identified by the socket corresponding to each load, the load identification accuracy is improved, and the technical problem that the electrical loads in the micro-grid system are easily affected by external factors and the identification accuracy is reduced when a large number of high-precision sensors are used to identify the electrical loads in the related art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0022] Figure 1 is a schematic diagram of an optional load identification system according to an embodiment of the present application;

[0023] Figure 2 is a schematic diagram of an optional socket according to an embodiment of the present application;

[0024] Figure 3 is a flowchart of a control method of a load identification system according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to enable the person skilled in the art to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0026] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] The present application can be applied to a direct current micro-grid system, and can identify information of various loads (such as load type, load name, and load power consumption), identify real-time running conditions and specific positions of all electrical loads in the direct current micro-grid in real time, thereby guiding a user to reasonably arrange use of the electrical loads according to the load information, and achieving energy-saving and emission-reducing measures such as power saving and peak-shifting power consumption. The present application will be described below in combination with various embodiments.

[0028] Embodiment one

[0029] In the present application, when identifying electrical loads, the electrical load can be identified by using differences in transient characteristics of electrical appliances (mainly similar power transient characteristics when the same type of electrical appliance is turned on, for example, electrical appliances are divided into six types according to transient characteristic curves: resistive electrical appliances, pump start electrical appliances, motor type electrical appliances, electrical feed type electrical appliances, electronic power control type electrical appliances, and fluorescent lamps), and at least one socket (each electrical access point is provided with a socket with a relay) in the micro-grid system is used to monitor and control start and stop of household electrical appliances, so that the master control unit can determine running information of all electrical loads in the direct current micro-grid system, locate specific positions of the electrical loads, guide a user to reasonably arrange use of the electrical loads according to the load information, and achieve energy-saving and emission-reducing measures such as power saving and peak-shifting power consumption.

[0030] According to an aspect of the embodiment of the present application, a load identification system is provided, comprising: at least one socket, a plurality of electrical loads, a voltage and current sensing module, and a control circuit, wherein,

[0031] The number of sockets corresponds to the electrical load, and at least one socket is configured for each electrical load, and a relay is configured in the socket.

[0032] A plurality of electrical loads, wherein each electrical load is connected to the DC bus through a socket, and the types of electrical loads are various, such as washing machines, air conditioners, televisions, induction cookers, computers, etc.

[0033] A voltage and current sensing module is arranged at the port of the DC bus, and is used to collect voltage and current information when the electrical loads use electrical energy, and the voltage and current sensing module can be a voltage and current sensor, a voltage sensing package, and a current sensing package.

[0034] A control circuit is connected with the voltage and current sensing module and the socket respectively, and based on the voltage and current information and the load power characteristics, the electrical energy use information of each electrical load is identified. The control circuit can be a master control unit, which includes a plurality of internal acquisition elements and a processor.

[0035] The above load identification system can connect each electrical load to the DC bus through the socket, collect the voltage and current information when the electrical loads use electrical energy by using the voltage and current sensing module, and identify the electrical energy use information of each electrical load based on the voltage and current information and the load power characteristics by the control circuit. In this embodiment, the real-time running conditions and specific positions of all electrical loads in the DC microgrid can be identified by the socket corresponding to each load, the load identification accuracy is improved, and the technical problem that the identification accuracy is reduced due to external influences when a large number of high-precision sensors are used to identify the electrical loads in the microgrid system in the related art is solved.

[0036] The electrical energy use information obtained by the control circuit at least includes load power consumption information, load opening time, load closing time, and load position.

[0037] Optionally, each socket at least includes a first relay and a second relay, wherein the coil side of the first relay is connected to the positive electrode of the DC bus, and the contact side of the first relay is connected with a switch quantity detection module of the control circuit; the contact side of the second relay is connected to the positive electrode of the DC bus, and the coil side of the second relay is connected with a switch quantity control module of the control circuit.

[0038] In the embodiment of the application, the control circuit at least includes: a switch quantity detection module connected with the contact side of the first relay in each socket; and a switch quantity control module connected with the coil side of the second relay in each socket.

[0039] The switch quantity detection module can be a switch quantity collector or a switch quantity sensor, and can acquire switch quantity information in real time.

[0040] In another optional solution, the control circuit further comprises a sampling module connected to the voltage and current sensing module, configured to collect voltage and current information at a preset sampling frequency and convert the collected voltage and current information into power information.

[0041] The sampling module can be a voltage and current receiver or a voltage and current sensor, configured to sample the electrical parameters acquired by the voltage and current sensing module at a preset sampling frequency (for example, 1 kHz or 2 kHz), and then convert the sampled voltage and current information into power parameters and transmit the power parameters to the load decomposition module of the control circuit.

[0042] Optionally, the control circuit further comprises an electrical appliance feature storage configured to store load power features of each electrical appliance load.

[0043] In the embodiment of the present application, the control circuit further comprises a load decomposition module connected to the sampling module and the electrical appliance feature storage, configured to determine a target electrical appliance load corresponding to the power information to be identified based on the power information and the load power features; and an information processing module configured to analyze electrical energy use information of the target electrical appliance load based on the switch quantity information collected by the switch quantity detection module.

[0044] The load decomposition module can be a load decomposer or a power converter, configured to use a non-intrusive load decomposition technology and introduce monitoring and control of switch quantity of each load, so as to reduce the burden of the load decomposition algorithm and improve the efficiency and accuracy of load decomposition.

[0045] The information processing module can be an information processing chip or a parameter calculator, configured to determine electrical energy use information (for example, power consumption, start-up / shut-down time and specific positions thereof) of each electrical appliance load based on the data provided by the load decomposition module and the switch quantity detection module after receiving the switch quantity information (used to indicate the switching state of the electrical appliance load in each working mode, for example, 0 indicating off state and 1 indicating on state).

[0046] Optionally, the load identification system further comprises a display configured to display the electrical energy use information processed by the information processing module in a preset display mode. The display can include a display screen and display the electrical energy use information in the form of a chart.

[0047] Alternatively, the load identification system may also include a terminal connected to a display for receiving power usage information.

[0048] Optionally, the load identification system may also include: a cloud server connected to the appliance feature memory, which transmits the power characteristics of different appliance loads to the appliance feature memory.

[0049] Figure 1 This is a schematic diagram of an optional load identification system according to an embodiment of the present invention, such as... Figure 1 As shown, the load identification system may include: socket 101 ( Figure 1 The diagram illustrates the first socket 101-1, the second socket 101-2, the third socket 101-3, the fourth socket 101-4, and the electrical load 102. Figure 1 The diagram illustrates the following components: a first load (induction cooker 102-1), a second load (television 102-1), a third load (television 102-3), a fourth load (air conditioner 102-4), a voltage and current sensor 103, a control circuit 104, a cloud server 105, a display 106, and a terminal 107. The current control module 104 may include: a sampling module 104-1, a load decomposition module 104-2, a switch quantity detection module 104-3, a switch quantity control module 104-4, an information processing module 104-5, and an appliance characteristic memory 104-6. Each appliance load 102 is connected to the DC bus via a socket.

[0050] Figure 2 This is a schematic diagram of an optional socket according to an embodiment of the present invention, such as... Figure 2 As shown, the socket integrates two relays. The coil side of the first relay 201 is connected to the DC bus +V, and the contact side of the first relay 201 (usually a normally open contact) is connected to the switch quantity detection module of the controller. The contact side of the second relay 202 (usually a normally closed contact) is connected to the DC bus +V, and the coil side of the second relay 202 is connected to the switch quantity control module of the controller.

[0051] A voltage and current sensor 103 is installed at the incoming port of the DC bus of the microgrid. The parameters output by the voltage and current sensor 103 are sent to the sampling module 104-1 in the control circuit 104. The electrical feature memory 104-6 can exchange information with the cloud server 105 through wired / wireless communication. The parameter package processed by the control circuit 104 is used for human-machine interaction through the display 106. The display transmits information to the terminal 107 through wired / wireless communication.

[0052] The voltage and current sensor 103 is at the entrance port of the DC bus, which can obtain the total voltage and current parameters in the user's home, and then transmit these parameters to the sampling module of the control circuit in real time. The sampling module can obtain these electrical parameters at a sampling frequency of 1 kHz, and then convert the sampled current and voltage parameters into power information and transmit them to the load decomposition module 104-2 of the control circuit.

[0053] When the electrical load is turned on or off, there will be a change in the total power and the switching quantity monitored by the control circuit. For example, when the household electrical load is turned on, the total power will increase the corresponding power change component according to the power characteristics of the electrical load during operation. Since the electrical load will have current flowing through its power line once it is turned on, the coil of the first relay 201 in the socket will have current flowing through the trigger contact to close the contact. When the electrical load is turned off, the power change component generated by the power of the electrical load on the total power will be eliminated, and the coil of the first relay 201 in the socket will have no current flowing through the contact to open the contact.

[0054] Different electrical loads will exhibit different power changes when they are running, and these inconsistent power changes are defined as their respective power characteristics. These power characteristics can be obtained by monitoring the power changes of the electrical load during the entire running process multiple times. Therefore, the electrical characteristics memory can download the standard power characteristics of different brands and types of electrical loads from the cloud server through the network (the same electrical load will also have different power characteristics in different working modes). The load decomposition module uses the total real-time power and the power characteristics in the electrical characteristics memory to identify the load. The basic principle of load identification is shown in the following mathematical model:

[0055] Where P(t) is the real-time total power obtained by the load decomposition module; P i j is the power of the i-th electrical appliance in j working modes; The switching condition of the i-th electrical appliance in j working modes. S has only two values of 0 and 1, 0 represents off, and 1 represents on.

[0056] e(t) is the error value of the detected real-time total power and the sum of the powers of all working electrical appliances.

[0057] The load decomposition module performs iterative operation through a genetic algorithm, and finally finds a set of power characteristics that can make e(t) in the above mathematical model reach a minimum value. At this time, the electrical load represented by the found set of power characteristics is the electrical load currently online in the residence. Since the control circuit can receive the on-off signals from the socket of each electrical load when it is turned on / off, the information processing module can obtain the power consumption, start-up / shut-down time, and specific location of each household electrical load by combining the data provided by the load decomposition module and the on-off signal detection module. Then, the control circuit displays the data processed by the information processing module in the form of charts to the user through the display, and synchronously transmits the chart information to the terminal APP through the network.

[0058] The control circuit has an on-off signal control module that can control the contacts of the second relay 202 in the socket to open the normally closed contacts. In the following scenarios, the control circuit does not actively issue on-off signal control instructions, but sends prompt suggestions to the terminal. The user can issue control instructions after viewing the terminal information; (1) if the user has left home, the user can discover which electrical appliances have been left on (such as an air conditioner) through the terminal APP, and then remotely turn off the electrical appliances through the terminal APP; (2) the control circuit actively and periodically notifies the terminal which electrical loads are in standby mode, and suggests that the user issue a shutdown instruction; (3) if the total power consumption is large and reaches a preset load threshold (for example, the threshold is set to 80% of the load), the control circuit sends a warning to the terminal that the current system load is high, and provides a list of electrical appliances that can be manually turned off. These suggested electrical appliances are generally short-time, high-instantaneous-power, emergency-shutdown-safe, and flexible-use electrical loads (such as hair dryers and electric kettles, which are defined by the control circuit as cuttable loads).

[0059] In the following scenarios, the control circuit actively issues on-off signal control instructions. (1) If the total power consumption is large and reaches 90% of the load, the control circuit immediately disconnects some cuttable loads to reduce the system load. (2) If the use time of a cuttable load is more than three times the normal use time, the control circuit immediately disconnects the electrical appliance.

[0060] Through the above embodiments, only one set of voltage and current sensors and sockets with internal relays are needed to monitor the running status of all electrical loads and the specific locations of the electrical loads. According to the real-time status of the electrical loads, the control circuit intelligently provides reasonable operation suggestions, and then the user can autonomously disconnect the loads locally or remotely. In the embodiments of the present application, the real-time running status and specific locations of all electrical loads in the direct-current microgrid are identified to guide the user to reasonably arrange the use of electrical appliances, thereby achieving energy-saving and emission-reducing measures such as saving electricity and peak-shifting electricity.

[0061] Embodiment Two

[0062] According to the embodiment of the present application, a control method of a load identification system is provided. It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from here.

[0063] The embodiment of the present application provides a control method of a load identification system, which is applied to any one of the load identification systems in the above embodiments.

[0064] Figure 3 A flowchart of a control method of a load identification system according to the embodiment of the present application is shown in FIG. 3, which includes the following steps: Figure 3

[0065] Step S302, receiving load power characteristics of all electrical loads;

[0066] Step S304, collecting voltage and current information and switching quantity information of the electrical loads in the current area when using electrical energy;

[0067] Step S306, analyzing target electrical loads corresponding to the voltage and current information based on the voltage and current information and the load power characteristics;

[0068] Step S308, analyzing electrical energy use information of the target electrical loads based on the switching quantity information.

[0069] Through the above steps, the load power characteristics of all electrical loads can be received, the voltage and current information and the switching quantity information of the electrical loads in the current area when using electrical energy can be collected, the target electrical loads corresponding to the voltage and current information can be analyzed based on the voltage and current information and the load power characteristics, and the electrical energy use information of the target electrical loads can be analyzed based on the switching quantity information. In this embodiment, the real-time running conditions and specific positions of all electrical loads in the direct current microgrid can be assisted to be identified through the socket corresponding to each load, the load identification accuracy is improved, and thus the technical problem that the electrical loads in the microgrid system are easily affected by external factors and the identification accuracy is reduced when a large number of high-precision sensors are used to identify the electrical loads in the microgrid system in the related art is solved.

[0070] Optionally, the electrical energy use information at least includes: load power consumption information, load opening time, load closing time and load position.

[0071] ​Optionally, after analyzing the power consumption information of the target electrical appliance load, the control method further comprises: analyzing whether the power consumption proportion in the current area exceeds a preset proportion threshold based on the load power consumption information; if the power consumption proportion in the current area exceeds the preset proportion threshold, disconnecting the preset electrical appliance load; and sending a system load height warning and a load closing suggestion list to the user terminal.

[0072] According to another aspect of the embodiments of the present application, a microgrid control device is also provided, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the control method of the load identification system of any one of the above aspects by executing the executable instructions.

[0073] According to another aspect of the embodiments of the present application, a computer readable storage medium is also provided, comprising a stored computer program, wherein the computer readable storage medium performs the control method of the load identification system of any one of the above aspects when the computer program is running.

[0074] The present application also provides a computer program product, when executed on a data processing device, is adapted to execute a program that is initialized with the following method steps: receiving load power characteristics of all electrical appliance loads; collecting voltage and current information and on-off quantity information when the electrical appliance loads in the current area use power; analyzing a target electrical appliance load corresponding to the voltage and current information based on the voltage and current information and the load power characteristics; and analyzing power consumption information of the target electrical appliance load based on the on-off quantity information.

[0075] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

[0076] In the above-mentioned embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0077] In the several embodiments provided by the present application, it should be understood that the disclosed technology can be implemented in other ways. Of course, the unit division in the above- described device embodiment is only a logical function division, and there can be another division manner during actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, can be indirect couplings or communication connections through some interfaces, units or modules, and can be electrical or other forms.

[0078] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0079] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0080] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application, essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various program code storage media.

[0081] The above is only the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A load identification system, characterized by, The application is applied to a direct current micro-grid system, comprising: at least one socket; a plurality of electrical loads, wherein the number of the electrical loads corresponds to the number of the sockets, and each of the electrical loads is connected to a direct current bus through the socket; a voltage and current sensing module arranged at a port of the direct current bus, for collecting voltage and current information when the electrical loads use electric energy; a control circuit connected with the voltage and current sensing module and the socket, for identifying electric energy use information of each of the electrical loads based on the voltage and current information and load power characteristics, and for monitoring electrical transient characteristics of the corresponding electrical load and controlling start and stop of the corresponding electrical load based on the electrical transient characteristics; wherein the control circuit comprises a switching quantity detection module and a switching quantity control module, each of the sockets comprises a first relay and a second relay, a coil side of the first relay is connected to a positive electrode of the direct current bus, and a contact side of the first relay is connected with the switching quantity detection module of the control circuit; a contact side of the second relay is connected to the positive electrode of the direct current bus, and a coil side of the second relay is connected with the switching quantity control module of the control circuit; the control circuit further comprises a load decomposition module connected with a sampling module and an electrical characteristic storage, for determining a target electrical load corresponding to to-be-identified power information based on power information and load power characteristics; and an information processing module for analyzing electric energy use information of the target electrical load based on switching quantity information collected by the switching quantity detection module.

2. The load identification system of claim 1, wherein, the control circuit further comprises: a sampling module connected with the voltage and current sensing module, for collecting the voltage and current information at a preset sampling frequency and converting the collected voltage and current information into power information.

3. The load identification system of claim 2, wherein, the control circuit further comprises: an electrical characteristic storage for storing load power characteristics of each of the electrical loads.

4. The load identification system of claim 1, wherein, the load identification system further comprises: a display for displaying electric energy use information processed by the information processing module in a preset display mode.

5. The load identification system of claim 4, wherein, the load identification system further comprises: a terminal connected with the display, for receiving electric energy use information.

6. The load identification system of claim 3, wherein, the load identification system further comprises: a cloud server connected with the electrical characteristic storage, for transmitting power characteristics of different electrical loads to the electrical characteristic storage.

7. The load identification system of claim 1, wherein, the plurality of electrical loads comprises an induction cooker, a television, a washing machine and an air conditioner.

8. A control method of a load identification system, characterized by, The control method is applied to the load identification system of any one of claims 1 to 7 and is applied to a direct current micro-grid system, comprising: monitoring electrical transient characteristics of all electrical loads and controlling start and stop of the electrical loads based on the electrical transient characteristics, comprising: receiving load power characteristics of all electrical loads; collecting voltage and current information and switching quantity information when the electrical loads in a current area use electric energy; analyzing a target electrical load corresponding to the voltage and current information based on the voltage and current information and the load power characteristics; analyzing electric energy use information of the target electrical load based on the switching quantity information.

9. The control method according to claim 8, characterized by, The power usage information includes: load power consumption information, load on time, load off time and load location.

10. The control method according to claim 9, characterized by, After analyzing the power usage information of the target electrical appliance load, the control method further includes: analyzing whether the power consumption proportion in the current area exceeds a preset proportion threshold based on the load power consumption information; if the power consumption proportion in the current area exceeds the preset proportion threshold, disconnecting the preset electrical appliance load; sending a system load height warning and a load off suggestion list to a user terminal.

11. A microgrid control device, characterized by, comprises: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the control method of the load identification system according to any one of claims 8 to 10 by executing the executable instructions.

12. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored computer program, wherein when the computer program runs, the device where the computer readable storage medium is located executes the control method of the load identification system according to any one of claims 8 to 10.

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