Grid-connected electric control box and grid-connected system of household distributed power supply

Abstract

The application relates to a grid-connected electric control box and a household distributed power grid-connected system in the technical field of distributed power supply, and the grid-connected electric control box comprises a metering module, a circuit control module and a communication module; the metering module is connected with an inverter and a power grid respectively, the communication module is connected with the metering module and the circuit control module respectively; the metering module is used for acquiring a first electric parameter of the inverter and a second electric parameter of the power grid, and is also used for determining a first electric quantity fed into the power grid by the inverter according to the first electric parameter and determining a second electric quantity called from the power grid according to the second electric parameter; the communication module is used for forwarding the first electric parameter to the circuit control module; and the circuit control module is used for controlling the working state of the inverter according to the first electric parameter. The grid-connected electric control box not only has a grid connection function, but also can acquire the first electric quantity fed into the power grid by the inverter and the second electric quantity called from the power grid, and through the setting of the circuit control module, the safe operation of the system is ensured.

Description

Technical Field

[0001] This application relates to the field of distributed power technology, and in particular to a grid-connected electrical control box and a household distributed power grid-connected system. Background Technology

[0002] With the acceleration of the global energy transition, residential distributed power systems, as an important way to utilize clean energy, can effectively reduce dependence on traditional fossil fuels, reduce carbon emissions, meet environmental protection requirements, and have been vigorously promoted and applied in many countries and regions.

[0003] In related technologies, traditional electrical control boxes have limited functions and cannot meet the grid connection requirements of household distributed power grid connection systems. Utility Model Content

[0004] To address the aforementioned technical issues, this application provides a grid-connected electrical control box and a household distributed power grid-connected system.

[0005] On the one hand, this application provides a grid-connected electrical control box, which includes: a metering module, a circuit control module, and a communication module;

[0006] The metering module is connected to the inverter and the power grid respectively, and the communication module is connected to the metering module and the circuit control module respectively;

[0007] The metering module is used to acquire a first electrical parameter of the inverter and a second electrical parameter of the power grid, and is also used to determine a first amount of electricity fed into the power grid by the inverter based on the first electrical parameter, and to determine a second amount of electricity drawn from the power grid based on the second electrical parameter;

[0008] The communication module is used to forward the first electrical parameter to the circuit control module;

[0009] The circuit control module is used to control the operating state of the inverter according to the first electrical parameter.

[0010] Optionally, the metering module includes a smart meter and an analog-to-digital converter, the smart meter is connected to the analog-to-digital converter, and the analog-to-digital converter is connected to the inverter and the power grid respectively;

[0011] The analog-to-digital converter is used to obtain the first electrical parameters of the inverter and the second electrical parameters of the power grid;

[0012] The smart meter is used to determine the first amount of electricity fed into the grid by the inverter based on the first electrical parameter, and to determine the second amount of electricity drawn from the grid based on the second electrical parameter.

[0013] Optionally, the analog-to-digital converter includes at least a voltage analog-to-digital converter and a current analog-to-digital converter.

[0014] Optionally, the circuit control module includes a circuit breaker;

[0015] The circuit breaker is used to trip when it detects that the first electrical parameter exceeds the corresponding set threshold, so as to stop the inverter from working.

[0016] Optionally, the circuit breaker includes main contacts, a free tripping mechanism, and at least one tripping unit;

[0017] The trip unit is used to drive the free trip mechanism to perform an unlocking action when it detects that the first electrical parameter exceeds the corresponding set threshold, so as to switch the main contact to the open state.

[0018] Optionally, the trip unit includes at least one of an overcurrent trip unit, an undervoltage trip unit, and a thermal trip unit.

[0019] Optionally, the communication module communicates with the client via a wireless network.

[0020] Optionally, the grid-connected electrical control box further includes: a box body; the metering module, the circuit control module and the communication module are located inside the box body.

[0021] Optionally, the grid-connected electrical control box further includes a display module, which is connected to the metering module and is located outside the box.

[0022] On the other hand, this application provides a residential distributed power grid-connected system, including: a distributed power source, an inverter, a power grid, a client, and any of the above-mentioned grid-connected electrical control boxes.

[0023] The technical solution provided in this application has the following advantages compared with the prior art:

[0024] The grid-connected electrical control box and residential distributed power grid-connected system provided in this application include: a metering module, a circuit control module, and a communication module; the metering module is connected to both the inverter and the power grid, and the communication module is connected to both the metering module and the circuit control module; the metering module is used to acquire a first electrical parameter of the inverter and a second electrical parameter of the power grid, and is also used to determine a first amount of electricity fed into the power grid by the inverter based on the first electrical parameter, and a second amount of electricity drawn from the power grid based on the second electrical parameter; the communication module is used to forward the first electrical parameter to the circuit control module; the circuit control module is used to control the operating state of the inverter based on the first electrical parameter. With this configuration, the grid-connected electrical control box not only has the function of feeding the electricity generated by the inverter into the power grid, but also can acquire the first amount of electricity fed into the power grid and the second amount of electricity drawn from the power grid, providing data support for users; at the same time, by setting up the circuit control module, it provides a guarantee for the safe operation of the residential distributed power grid-connected system. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a grid-connected electrical control box provided in an embodiment of this application;

[0028] Figure 2 This application provides a residential distributed power grid-connected system.

[0029] Among them, 10. Grid-connected electrical control box; 11. Metering module; 111. Smart meter; 112. Analog-to-digital converter; 1121. Voltage analog-to-digital converter; 1122. Current analog-to-digital converter; 12. Circuit control module; 121. Circuit breaker; 13. Communication module; 14. Box; 15. Display module; 16. Input interface; 17. Load interface; 18. Grid interface; 19. Wireless communication interface; 20. Inverter; 30. Grid; 40. Client; 50. Distributed power supply; 60. Wireless network; 70. User load. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0032] This application provides a grid-connected electrical control box, which is applied to a residential distributed power grid-connected system. It is used to connect the inverter and the power grid, feed the electrical energy generated by the inverter into the power grid, and realize the grid-connected function.

[0033] Figure 1 This is a schematic diagram of a grid-connected electrical control box provided in an embodiment of this application. (Refer to...) Figure 1 The grid-connected electrical control box 10 includes a metering module 11, a circuit control module 12, and a communication module 13. The metering module 11 is connected to the inverter 20 and the power grid 30, respectively, and the communication module 13 is connected to the metering module 11 and the circuit control module 12, respectively.

[0034] The metering module 11 is used to acquire the first electrical parameters of the inverter 20 and the second electrical parameters of the power grid. It is also used to determine the first amount of electricity fed into the power grid by the inverter 20 based on the first electrical parameters, and to determine the second amount of electricity drawn from the power grid 30 based on the second electrical parameters. The first electrical parameters include, but are not limited to, basic electrical parameters of the inverter 20 such as current I1, voltage U1, and resistance R1. The second electrical parameters include, but are not limited to, basic electrical parameters of the power grid 30 such as current I2, voltage U2, and resistance R2.

[0035] In addition to calculating the first and second electrical quantities, the metering module 11 can also calculate other power-related parameters, such as effective power P and power factor COSφ.

[0036] The metering module 11 transmits the acquired first electrical parameter, second electrical parameter, first power quantity, and second power quantity to the communication module 13. The communication module 13 is used to forward the first electrical parameter to the circuit control module 12.

[0037] The circuit control module 12 is used to control the operating state of the inverter based on the first electrical parameter. Specifically, the circuit control module 12 determines whether there is an abnormality in the inverter and the circuit in which the inverter is located based on the first electrical parameter, and if an abnormality occurs in the inverter and the circuit in which the inverter is located, it controls the inverter to stop working, thus ensuring the safe operation of the residential distributed power grid-connected system. The circuit control module 12 also transmits the fault information of the inverter 20 to the communication module 13.

[0038] Optionally, the communication module 13 is connected to the client 40 to transmit data from the metering module 11 and the circuit control module 12 to the client 40, providing data support for the user and realizing functions such as remote monitoring, intelligent management, and intelligent information processing. The client 40 includes a smart mobile terminal and a networked computer. The smart mobile terminal includes, but is not limited to, mobile phones, laptops, tablets, and other smart devices with visualization functions.

[0039] The grid-connected power control box 10 provided in this application includes: a metering module 11, a circuit control module 12, and a communication module 13. The metering module 11 is connected to the inverter 20 and the power grid 30, respectively, and the communication module 13 is connected to both the metering module 11 and the circuit control module 12. The metering module 11 is used to acquire a first electrical parameter of the inverter 20 and a second electrical parameter of the power grid, and is also used to determine a first amount of electricity fed into the power grid 30 by the inverter 20 based on the first electrical parameter, and a second amount of electricity drawn from the power grid 30 based on the second electrical parameter. The communication module 13 is used to forward the first electrical parameter to the circuit control module 12. The circuit control module 12 is used to control the operating state of the inverter 20 based on the first electrical parameter. With this configuration, the grid-connected power control box 10 not only has the grid-connected function of feeding the electrical energy generated by the inverter 20 into the power grid 30, but also can acquire the first amount of electricity fed into the power grid by the inverter 20 and the second amount of electricity drawn from the power grid, providing data support for users. At the same time, by setting up the circuit control module 12, the safe operation of the household distributed power grid-connected system is guaranteed.

[0040] In some embodiments, such as Figure 2 As shown, the communication module 13 communicates with the client 40 via a wireless network (WiFi) 60.

[0041] In this embodiment, the communication module 13 includes a wireless communication module, which wirelessly communicates with the client 40.

[0042] In some embodiments, such as Figure 2 As shown, the metering module 11 includes a smart meter 111 and an analog-to-digital converter 112. The smart meter 111 is connected to the analog-to-digital converter 112, which is connected to the inverter 20 and the power grid 30 respectively. The analog-to-digital converter 112 is used to obtain the first electrical parameters of the inverter 20 and the second electrical parameters of the power grid 30. The smart meter 111 is used to determine the first amount of electricity fed into the power grid 30 by the inverter 20 based on the first electrical parameters, and to determine the second amount of electricity drawn from the power grid 30 based on the second electrical parameters.

[0043] The smart meter 111 is connected to the analog-to-digital converter 112, and the analog-to-digital converter 112 is connected to the inverter 20 and the power grid 30 through corresponding circuits.

[0044] For example, such as Figure 2 As shown, the electrical energy output by inverter 20 is alternating current, which is connected to the power grid 30 through metering module 11, establishing a grid connection between inverter 20 and power grid 30. Metering module 11 includes smart meter 111 and analog-to-digital converter 112 connected to smart meter 111. Analog-to-digital converter 112 is also connected to inverter 20 and power grid 30, transmitting the first electrical parameter of inverter 20 and the second electrical parameter of power grid 30 to smart meter 111. Smart meter 111 determines the first amount of electricity fed into power grid 30 by inverter 20, and determines the second amount of electricity drawn from power grid 30 based on the second electrical parameter.

[0045] In some embodiments, analog-to-digital converter 112 includes at least voltage analog-to-digital converter 1121 and current analog-to-digital converter 1122.

[0046] The voltage analog-to-digital converter 1121 is used to acquire the current value of the circuit where the inverter 20 is located, and the current value of the circuit where the power grid 30 is located. The current analog-to-digital converter 1122 is used to acquire the voltage value of the circuit where the inverter 20 is located, and the voltage value of the circuit where the power grid 30 is located.

[0047] In some embodiments, such as Figure 2 As shown, the grid-connected electrical control box is also connected to the user load 70 to supply power to the user load 70 with the electrical energy generated by the inverter 20 or the electrical energy called from the power grid 30.

[0048] During off-peak hours, excess power generated by inverter 20 is transferred to the power grid 30. During peak hours, power generated by inverter 20 is used preferentially. When the power generated by inverter 20 is insufficient, power is drawn from the power grid 30 to meet the power needs of user load 70. User load 70 includes user-side electrical equipment, such as household appliances and sockets.

[0049] Optionally, such as Figure 2 As shown, the metering module 11 of the grid-connected power control box 10 is connected to the user load 70 and is used to obtain the user's electricity consumption data, including but not limited to electricity consumption, current value and voltage value.

[0050] In some embodiments, such as Figure 2 As shown, the circuit control module 12 includes a circuit breaker 121; the circuit breaker 121 is used to perform a trip operation when it detects that the first electrical parameter exceeds the corresponding set threshold, so as to stop the inverter 20 from working.

[0051] The circuit breaker 121 is connected to the inverter 20 through a corresponding circuit. When the circuit breaker 121 detects that the first electrical parameter exceeds the corresponding set threshold, that is, when the inverter 20 and its circuit are in an abnormal situation, the circuit breaker 121 automatically trips, causing the inverter 20 to stop working.

[0052] In some embodiments, the circuit breaker includes main contacts, a free trip mechanism, and at least one trip unit; the trip unit is used to drive the free trip mechanism to perform an unlocking action when it detects that a first electrical parameter exceeds a corresponding set threshold, so as to switch the main contacts to the open state.

[0053] The main contacts are used to connect or disconnect the circuit, acting as a switch to turn the circuit on or off. The main contacts can be in a closed or open state.

[0054] Under normal circumstances, when the main contacts are closed, the free-trip mechanism locks the main contacts, conducts the circuit, and the inverter operates. Under abnormal circumstances, such as overload, short circuit, or undervoltage faults in the inverter or circuit, the trip unit pushes the free-trip mechanism to unlock the main contacts, disconnecting them, cutting off the circuit, and stopping the inverter from operating.

[0055] In some embodiments, the trip unit includes at least one of an overcurrent trip unit, an undervoltage trip unit, and a thermal trip unit.

[0056] When a short circuit or severe overload occurs in the circuit or inverter, the overcurrent trip unit will activate the free trip unit, which will then open the main contacts and stop the inverter from working.

[0057] When the circuit is undervoltage, the undervoltage release device pushes the free release mechanism, the main contacts open, and the inverter stops working.

[0058] When an overload occurs in the circuit or inverter, the thermal trip unit will activate the free trip mechanism, the main contacts will open, and the inverter will stop working.

[0059] In some embodiments, such as Figure 2 As shown, the grid-connected electrical control box 10 also includes a disconnect switch, which is located on the circuit between the inverter 20 and the circuit breaker 121 to isolate the power supply (inverter 20) to ensure the safety of equipment maintenance personnel or workers.

[0060] In some embodiments, such as Figure 2 As shown, the grid-connected electrical control box 10 also includes: a box body 14; a metering module 11, a circuit control module 12 and a communication module 13 are located inside the box body.

[0061] This design isolates the core components of the grid-connected electrical control box 10 from the external environment by placing them inside the box, thus providing dust and moisture protection. It also facilitates standardized management and prevents non-compliant operations by unqualified personnel.

[0062] In some embodiments, such as Figure 2 As shown, the grid-connected electrical control box 10 also includes a display module 15, which is connected to the metering module 11 and is located outside the box body 14.

[0063] With this configuration, the display content of the display module 15 includes, but is not limited to, the first electrical parameter, the second electrical parameter, the first power consumption and the second power consumption, and may also include data such as the power consumption, voltage and current of the user load.

[0064] In some embodiments, such as Figure 2 As shown, the enclosure 14 has an input interface 16, a load interface 17, a power grid interface 18, and a wireless communication interface 19.

[0065] The inverter 20 provides an input interface 16 and corresponding circuitry to connect to the metering module 1. The metering module 11 is connected to the power grid 30 via the grid interface 18 and corresponding circuitry. The metering module 11 is also connected to the user load 70 via the load interface 17 and corresponding circuitry. The communication module 13 connects wirelessly to the client via the wireless communication interface 19.

[0066] Based on the above embodiments, this application also provides a residential distributed power grid-connected system. For example... Figure 2 As shown, the distributed power grid-connected system includes: a distributed power source 50, an inverter 20, a power grid 30, a client 40, and any of the above-mentioned grid-connected electrical control boxes 10, all of which have the same beneficial effects. To avoid repetition, they will not be described again here.

[0067] The distributed power source 50 includes all types of distributed power generation devices known to those skilled in the art, such as distributed photovoltaic modules and / or distributed wind power generation devices.

[0068] The residential distributed power grid-connected system also includes all the components known to those skilled in the art, such as user loads and networking devices.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0070] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grid-connected electrical control box, characterized in that, The grid-connected electrical control box includes: a metering module, a circuit control module, and a communication module; The metering module is connected to the inverter and the power grid respectively, the communication module is connected to the metering module and the circuit control module respectively, and the circuit control module is connected to the inverter; The metering module is used to acquire a first electrical parameter of the inverter and a second electrical parameter of the power grid, and is also used to determine a first amount of electricity fed into the power grid by the inverter based on the first electrical parameter, and to determine a second amount of electricity drawn from the power grid based on the second electrical parameter; The communication module is used to forward the first electrical parameter to the circuit control module; The circuit control module is used to control the operating state of the inverter according to the first electrical parameter.

2. The grid-connected electrical control box according to claim 1, characterized in that, The metering module includes a smart meter and an analog-to-digital converter. The smart meter is connected to the analog-to-digital converter, and the analog-to-digital converter is connected to the inverter and the power grid, respectively. The analog-to-digital converter is used to obtain the first electrical parameters of the inverter and the second electrical parameters of the power grid; The smart meter is used to determine the first amount of electricity fed into the grid by the inverter based on the first electrical parameter, and to determine the second amount of electricity drawn from the grid based on the second electrical parameter.

3. The grid-connected electrical control box according to claim 2, characterized in that, The analog-to-digital converter includes at least a voltage analog-to-digital converter and a current analog-to-digital converter.

4. The grid-connected electrical control box according to claim 1, characterized in that, The circuit control module includes a circuit breaker; The circuit breaker is used to trip when it detects that the first electrical parameter exceeds the corresponding set threshold, so as to stop the inverter from working.

5. The grid-connected electrical control box according to claim 4, characterized in that, The circuit breaker includes main contacts, a free tripping mechanism, and at least one tripping device; The trip unit is used to drive the free trip mechanism to perform an unlocking action when it detects that the first electrical parameter exceeds the corresponding set threshold, so as to switch the main contact to the open state.

6. The grid-connected electrical control box according to claim 5, characterized in that, The trip unit includes at least one of an overcurrent trip unit, an undervoltage trip unit, and a thermal trip unit.

7. The grid-connected electrical control box according to claim 1, characterized in that, The communication module communicates with the client via a wireless network.

8. The grid-connected electrical control box according to claim 1, characterized in that, Also includes: The housing; the metering module, the circuit control module and the communication module are located inside the housing.

9. The grid-connected electrical control box according to claim 8, characterized in that, Also includes: The display module is connected to the metering module and is located outside the housing.

10. A residential distributed power grid-connected system, characterized in that, include: Distributed power source, inverter, power grid, client, and grid-connected electrical control box as described in any one of claims 1-9.

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