Power grid connecting device and power supply system
By setting up relay, sampling and control circuits in the power grid connection device, and controlling the power grid connection according to the instructions of the energy storage inverter equipment, the problem of the inability to adjust the power grid connection according to the power consumption needs in the prior art is solved, and a more efficient load is achieved Save costs for management and electricity use.
Patent Information
- Application Number
- CN202411329543.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-01-03
AI Technical Summary
There is a lack of a means in the prior art that can disconnect or conduct the connection between the internal power grid and the external power grid according to actual power consumption requirements, resulting in the energy storage inverter equipment being unable to reasonably allocate power supply when the external power grid is unstable.
Design a power grid connection device, including a relay circuit, a sampling circuit and a control circuit, and transmits it to the energy storage inverter equipment by collecting electrical energy data on the load side and the power grid side, and controls the relay circuit to be disconnected according to the instructions of the energy storage inverter equipment. Turn on or turn on to adjust the grid connection according to actual power consumption needs.
It realizes the connection between the internal power grid and the external power grid reasonably disconnects or conducts the internal power grid according to actual power consumption needs, improves the load management efficiency when power supply of energy storage inverter equipment, and reduces household electricity costs.
Smart Images
Figure CN119253594A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of power supply technology, and in particular to a power grid connection device and a power supply system. Background Art
[0002] At present, the penetration rate of energy storage inverter equipment in household electricity consumption is gradually increasing. When the external power grid is unstable, the energy storage inverter equipment can be used to supply power to the household's internal power grid.
[0003] However, when the external power grid is unstable, the internal power grid needs to be disconnected from the external power grid while the energy storage inverter is used to supply power to the load of the internal power grid, so as to reduce the load when the energy storage inverter is supplying power. The prior art lacks a means to disconnect or connect the internal power grid to the external power grid according to actual power demand. Summary of the invention
[0004] In view of this, the present application provides a power grid connection device and a power supply system, which are used to disconnect or connect the internal power grid and the external power grid according to the actual power demand, so as to supply power to the load in the internal power grid more reasonably according to the actual power demand. The technical solution of the present application is as follows:
[0005] In a first aspect, the present application provides a power grid connection device, which is arranged between an electric meter and a power distribution device, connected to the electric meter and connected to a load and a power grid through the power distribution device; the power grid connection device comprises a relay circuit, a sampling circuit and a control circuit, the first end of the relay circuit is connected to the power distribution device, the second end of the relay circuit is connected to the electric meter, the sampling circuit is connected to the first end and the second end of the relay circuit, and the control circuit is connected to the relay circuit, the sampling circuit and an energy storage inverter device; the sampling circuit is used to collect first electric energy data on the load side and second electric energy data on the electric meter side, and transmit the first electric energy data and the second electric energy data to the control circuit; the control circuit is used to: transmit the first electric energy data and the second electric energy data to the energy storage inverter device; receive a disconnection instruction of the energy storage inverter device, control the relay circuit to disconnect, and transmit the disconnection state information of the relay circuit to the energy storage inverter device; receive a conduction instruction of the energy storage inverter device, control the relay circuit to conduct, and transmit the conduction state information of the relay circuit to the energy storage inverter device.
[0006] In one embodiment of the present application, the grid connection device also includes a switch button, which is connected to the relay circuit, and the switch button is used to control the conduction of the relay circuit when manually triggered; the control circuit is also used to transmit the conduction status information of the relay circuit to the energy storage inverter device after the relay circuit is turned on.
[0007] In one embodiment of the present application, the sampling circuit includes a voltage acquisition unit and a built-in electricity meter, the first electric energy data includes load-side voltage data, the second electric energy data includes meter-side voltage data and power data and energy data flowing from the meter to the grid connection device; the voltage acquisition unit is connected to the first end and the second end of the relay circuit, and the voltage acquisition unit is used to acquire the load-side voltage data and the meter-side voltage data; the built-in electricity meter is connected to the second end of the relay circuit, and the built-in electricity meter is used to acquire the power data and the energy data flowing from the meter to the grid connection device.
[0008] In one embodiment of the present application, the grid connection device also includes a grid terminal, a first meter terminal, a second meter terminal and a load side terminal; the grid terminal is used to connect to the grid through the power distribution equipment, and to the first meter terminal; the first meter terminal and the second meter terminal are used to connect the meter, and the second end of the relay circuit is connected to the second meter terminal; the load side terminal is connected to the first end of the relay circuit, and is connected to the load through the power distribution equipment.
[0009] In one embodiment of the present application, the grid connection device also includes an auxiliary power supply, which is connected to the second meter terminal and the control circuit. The auxiliary power supply is used to obtain electrical energy from the second meter terminal and convert it into an auxiliary power supply voltage and then transmit it to the control circuit.
[0010] In one embodiment of the present application, the grid connection device further includes a wireless communication unit, which is connected to the control circuit; the wireless communication unit is used to communicate with the energy storage inverter device.
[0011] The second aspect of the present application provides a power supply system, including a power distribution device, an electric meter, an energy storage inverter device and a grid connection device; the energy storage inverter device is connected to the grid through the power distribution device; the grid connection device is arranged between the electric meter and the power distribution device, connecting the electric meter and connecting to the load and the grid through the power distribution device; the grid connection device is communicatively connected with the energy storage inverter device; the grid connection device is used to: collect first electric energy data on the load side and second electric energy data on the electric meter side, and transmit the first electric energy data and the second electric energy data to the energy storage inverter device; when receiving a disconnection instruction, disconnect the connection between the power distribution device and the electric meter, and when receiving a conduction instruction, conduct the connection between the power distribution device and the electric meter; the energy storage inverter device is used to generate and output the disconnection instruction or the conduction instruction according to the second electric energy data.
[0012] In one embodiment of the present application, the grid connection device includes a relay circuit, a sampling circuit and a control circuit, the first end of the relay circuit is connected to the power distribution equipment, the second end of the relay circuit is connected to the electric meter, the sampling circuit is connected to the first end and the second end of the relay circuit, and the control circuit is connected to the relay circuit, the sampling circuit and the energy storage inverter device; the sampling circuit is used to collect the first electric energy data on the load side and the second electric energy data on the electric meter side, and transmit the first electric energy data and the second electric energy data to the control circuit; the control circuit is used to: transmit the first electric energy data and the second electric energy data to the energy storage inverter device; receive the disconnection instruction of the energy storage inverter device, control the relay circuit to disconnect, and transmit the disconnection state information of the relay circuit to the energy storage inverter device; after sending the second electric energy data to the energy storage inverter device, receive the conduction instruction of the energy storage inverter device, control the conduction of the relay circuit, and transmit the conduction state information of the relay circuit to the energy storage inverter device.
[0013] In one embodiment of the present application, the energy storage inverter device includes a power conversion circuit and a controller; the controller is used to: when it is determined that the grid side is abnormal according to the second electric energy data, generate and output the disconnection instruction to the grid connection device; when it is determined that the grid side has returned to normal according to the second electric energy data, control the output voltage of the power conversion circuit to be synchronized with the grid side according to the second electric energy data, and generate and output the conduction instruction to the grid connection device; after the grid connection device is turned on, adjust the output power of the power conversion circuit according to the first electric energy data.
[0014] In one embodiment of the present application, the energy storage inverter device also includes a photovoltaic component and a battery component, and the photovoltaic component and the battery component are respectively connected to the power conversion circuit; the photovoltaic component is used to provide a photovoltaic voltage to the power conversion circuit; the battery component is used to output a discharge voltage to the power conversion circuit, or to receive a charging voltage from the power conversion circuit to store electrical energy.
[0015] The grid connection device of the present application is arranged between the power distribution equipment and the electric meter, and collects the first electric energy data on the load side and the second electric energy data on the grid side and transmits them to the energy storage inverter device, so that the energy storage inverter device can control the grid connection device to disconnect or conduct the connection between the internal grid and the external grid according to the first electric energy data and the second electric energy data in combination with the actual power demand, so that the load in the internal grid can be powered more reasonably according to the actual power demand. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic block diagram of a power supply system provided in an embodiment of the present application.
[0017] Figure 2 It is a schematic block diagram of a power grid connection device provided in an embodiment of the present application.
[0018] Figure 3 It is a schematic block diagram of a second grid connection device provided in an embodiment of the present application.
[0019] Figure 4 It is a schematic block diagram of a third grid connection device provided in an embodiment of the present application.
[0020] Figure 5 It is a schematic block diagram of a fourth grid connection device provided in an embodiment of the present application.
[0021] Figure 6 It is a schematic block diagram of a fifth grid connection device provided in an embodiment of the present application.
[0022] Figure 7 It is a schematic block diagram of a second power supply system provided in an embodiment of the present application. DETAILED DESCRIPTION
[0023] It should be noted that in the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.
[0024] It should also be noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart includes one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchangeable with each other, and some of the steps can also be deleted.
[0025] At present, the penetration rate of energy storage inverter equipment in household electricity consumption is gradually increasing. When the external power grid is unstable, the energy storage inverter equipment can be used to supply power to the household's internal power grid.
[0026] However, when the external power grid is unstable, the internal power grid needs to be disconnected from the external power grid while the energy storage inverter is used to supply power to the load of the internal power grid, so as to reduce the load when the energy storage inverter is supplying power. The prior art lacks a means to disconnect or connect the internal power grid to the external power grid according to actual power demand.
[0027] The embodiments of the present application provide a grid connection device and a power supply system, which are used to disconnect or connect the internal grid and the external grid according to actual power demand, so as to supply power to the loads in the internal grid more reasonably according to actual power demand.
[0028] Please refer to Figure 1 , Figure 1 A schematic block diagram of a power supply system provided in an embodiment of the present application, wherein the power supply system 100 includes a power distribution device 110 , an electric meter 120 , an energy storage inverter device 130 and a grid connection device 140 .
[0029] In the embodiment of the present application, the energy storage inverter device 130 is connected to the power grid through the power distribution device 110. The power grid connection device 140 is provided between the electric meter 120 and the power distribution device 110, and is connected to the electric meter 120 and to the load and the power grid through the power distribution device 110. The power grid connection device 140 is in communication connection with the energy storage inverter device 130.
[0030] Among them, the grid connection device 140 is used to: collect the first electric energy data on the load side and the second electric energy data on the electric meter 120 side, transmit the first electric energy data and the second electric energy data to the energy storage inverter device 130, and when receiving a disconnection command, disconnect the connection between the distribution equipment 110 and the electric meter 120, and when receiving a connection command, connect the connection between the distribution equipment 110 and the electric meter 120.
[0031] For example, a relay circuit may be provided in the grid connection device 140, and the power distribution device 110 and the electric meter 120 are connected respectively through the relay circuit. When the grid connection device 140 receives the disconnection instruction, it controls the relay circuit to disconnect the connection between the power distribution device 110 and the electric meter 120, so that the load side is disconnected from the grid side, so that the energy storage inverter device 130 supplies power to the internal grid on the load side through the power distribution device 110 alone. In addition, when the grid connection device receives the conduction instruction, it controls the relay circuit to conduct the connection between the power distribution device 110 and the electric meter 120, so that the load side is connected to the grid side, so that the energy storage inverter device 130 and the grid supply power to the internal grid on the load side through the power distribution device 110 at the same time. In addition, the grid connection device 140 also includes a sampling circuit, which collects the first electric energy data on the load side and the second electric energy data on the electric meter side through the sampling circuit. It can be understood that the electric meter side is the above-mentioned grid side.
[0032] In some embodiments, the above-mentioned power distribution equipment 110 includes equipment such as distribution boards, distribution boxes and distribution cabinets, which are used to configure a home power grid. The power distribution equipment 110 includes multiple terminals, which are respectively connected to an external power grid, a home internal power grid, an energy storage inverter device 130, and can be connected to an electric meter 120 through a power grid connection device 140.
[0033] The energy storage inverter device 130 is used to generate and output a disconnection instruction or a conduction instruction according to the first power data and the second power data. For example, when the energy storage inverter device 130 determines that there is an abnormality in the external power grid according to the second power data, it can control the grid connection device 140 to disconnect the connection between the power distribution device 110 and the electric meter 120, so that the load side is disconnected from the grid side, so that the energy storage inverter device 130 supplies power to the internal grid of the load side through the power distribution device 110 alone, and conducts the connection between the power distribution device 110 and the electric meter 120 when it is determined that the external power grid has returned to normal according to the second power data.
[0034] For another example, when the energy storage inverter device 130 determines that the load power consumption of the internal power grid is relatively small according to the second power data, it can also control the grid connection device 140 to disconnect the connection between the power distribution device 110 and the electric meter 120, so that the load side is disconnected from the grid side, so that the energy storage inverter device 130 supplies power to the internal power grid on the load side through the power distribution device 110 alone, thereby achieving the effect of saving household electricity costs. When it is determined that the load power consumption of the internal power grid is relatively large according to the first power data, the connection between the power distribution device 110 and the electric meter 120 is turned on to avoid affecting the normal operation of the load.
[0035] In some embodiments, the energy storage inverter device 130 can also output corresponding power according to the second electric energy data and the real-time rate of the power grid to reduce the power consumption of the load side from the power grid. For example, during peak hours when the electricity price is high, the energy storage inverter device 130 outputs corresponding power according to the second electric energy data and supplies power to the load together with the power grid, thereby achieving the effect of saving household electricity costs.
[0036] It can be understood that the power supply system 100 of the embodiment of the present application is provided with a grid connection device 140 between the power distribution equipment 110 and the electric meter 120, and the first electric energy data on the load side and the second electric energy data on the grid side are collected by the grid connection device 140 and transmitted to the energy storage inverter device 130, so that the energy storage inverter device 130 can control the grid connection device 140 to disconnect or conduct the connection between the internal power grid and the external power grid according to the first electric energy data and the second electric energy data in combination with the actual power demand, so that the power supply system 100 can supply power to the load in the internal power grid more reasonably according to the actual power demand.
[0037] Furthermore, in some embodiments, the household electricity meter 120 is generally installed on the base provided by the power distribution equipment 110 during installation, and the grid connection device 140 of the present solution can be first installed on the base provided by the power distribution equipment 110, and then the electricity meter 120 can be installed, thereby achieving the purpose of reducing wiring and simplifying the installation of the grid connection device 140. The specific grid connection device 140 can refer to the following implementation.
[0038] Please refer to Figure 2 , Figure 2 This is a schematic block diagram of a grid connection device provided in an embodiment of the present application, wherein the grid connection device 140 includes a relay circuit 141 , a sampling circuit 142 and a control circuit 143 .
[0039] In an embodiment of the present application, the first end of the relay circuit 141 is connected to the power distribution equipment 110, the second end of the relay circuit 141 is connected to the electric meter 120, the sampling circuit 142 is connected to the first end and the second end of the relay circuit 141, and the control circuit 143 is connected to the relay circuit 141, the sampling circuit 142 and the energy storage inverter device 130.
[0040] The sampling circuit 142 is used to collect the first electric energy data on the load side and the second electric energy data on the electric meter 120 side, and transmit the first electric energy data and the second electric energy data to the control circuit 143. The control circuit 143 is used to: transmit the first electric energy data and the second electric energy data to the energy storage inverter device 130, receive the disconnection instruction of the energy storage inverter device 130, control the relay circuit 141 to disconnect, and transmit the disconnection state information of the relay circuit 141 to the energy storage inverter device 130, after sending the second electric energy data to the energy storage inverter device 130, receive the conduction instruction of the energy storage inverter device 130, control the relay circuit 141 to conduct, and transmit the conduction state information of the relay circuit 141 to the energy storage inverter device 130.
[0041] In the embodiment of the present application, the energy storage inverter device 130 determines the state of the current relay circuit 141 according to the disconnection state information or the conduction state information, so as to generate corresponding control instructions in combination with the first electric energy data and the second electric energy data of the actual power consumption. It can be understood that the grid connection device 140 of the present application is arranged between the power distribution device 110 and the electric meter 120, collects the first electric energy data on the load side and the second electric energy data on the grid side and transmits them to the energy storage inverter device 130, so that the energy storage inverter device 130 can control the grid connection device 140 to disconnect or conduct the connection between the internal grid and the external grid according to the first electric energy data and the second electric energy data in combination with the actual power demand, so as to supply power to the load in the internal grid more reasonably according to the actual power demand.
[0042] In some embodiments, Figure 3 As shown, the grid connection device 140 also includes a switch button 144. The switch button 144 is connected to the relay circuit 141, and the switch button 144 is used to control the relay circuit 141 to be turned on when manually triggered. The control circuit 143 is also used to transmit the conduction state information of the relay circuit 141 to the energy storage inverter device 130 after the relay circuit 141 is turned on.
[0043] It can be understood that by providing a switch button 144 in the grid connection device 140, when a fault occurs in the grid connection device 140, the user can manually trigger the switch button 144 to control the relay circuit 141 to conduct, thereby ensuring that the load in the internal grid can receive the power supply voltage of the external grid and operate normally.
[0044] In some embodiments, Figure 4 As shown, the sampling circuit 142 includes a voltage acquisition unit 1421 and a built-in electricity meter 1422 , the first electric energy data includes load side voltage data, and the second electric energy data includes meter side voltage data and power data and energy data flowing from the electricity meter 120 into the grid connection device 140 .
[0045] The voltage acquisition unit 1421 is connected to the first end and the second end of the relay circuit 141, and is used to collect voltage data on the load side and voltage data on the electric meter 120 side. The built-in electricity meter 1422 is connected to the second end of the relay circuit 141, and is used to collect power data and energy data flowing from the electric meter 120 into the grid connection device 140.
[0046] In some embodiments, Figure 5 As shown, the grid connection device 140 further includes a grid terminal 145 , a first electric meter terminal 146 , a second electric meter terminal 147 and a load side terminal 148 .
[0047] The grid terminal 145 is used to connect to the grid through the power distribution equipment 110, and is connected to the first meter terminal 146. The first meter terminal 146 and the second meter terminal 147 are used to connect to the meter 120, and the second end of the relay circuit 141 is connected to the second meter terminal 147. The load side terminal 148 is connected to the first end of the relay circuit 141, and is connected to the load through the power distribution equipment 110.
[0048] It can be understood that the grid terminal 145 and the first meter terminal 146 shown in the example in the figure are connected by three sections of conductive wires, which may include two sections of live wires and one section of neutral wire, to correspond to the model of the meter 120 connected with two live wires and one neutral wire. In other embodiments, according to the wiring requirements of different models of meters 120, the grid terminal 145 and the first meter terminal 146 can also be connected by other numbers of conductive wires, which are not limited here.
[0049] Among them, the grid connection device 140 is provided with a grid terminal 145, a first meter terminal 146, a second meter terminal 147 and a load side terminal 148, which can reduce the wiring operation during the installation of the grid connection device 140, thereby facilitating the installation of the grid connection device 140 between the power distribution equipment 110 and the meter 120.
[0050] In some embodiments, Figure 6 As shown, the grid connection device 140 also includes an auxiliary power supply 149, which is connected to the second meter terminal 147 and the control circuit 143. The auxiliary power supply 149 is used to obtain electric energy from the second meter terminal 147 and convert it into an auxiliary power supply voltage and then transmit it to the control circuit 143. The grid connection device 140 also includes a wireless communication unit 1410, which is connected to the control circuit 143 and is used to communicate with the energy storage inverter device 130.
[0051] Among them, the above-mentioned auxiliary power supply 149 can also include a battery unit, which stores electrical energy. When the power grid is abnormal and cannot provide power supply voltage, the battery unit can provide auxiliary power supply for the control circuit 143, so that the power grid connection device 140 can operate stably.
[0052] In some embodiments, when the grid connection device 140 communicates with the energy storage inverter device 130 via a wired connection, the auxiliary power supply 149 can also obtain electric energy from the energy storage inverter device 130 and convert it into an auxiliary power supply voltage before transmitting it to the control circuit 143. That is, the auxiliary power supply 149 is connected to the communication circuit of the grid connection device 140, and the communication circuit is connected to the energy storage inverter device 130 via a wired connection, and is used to communicate with the energy storage inverter device 130 and receive its electric energy.
[0053] That is, the grid connection device 140 may also include a communication terminal, which is connected to the control circuit 143 and the auxiliary power supply 149. The communication terminal is used to connect to the energy storage inverter device 130 via a power line and a communication line, and is used to communicate with the energy storage inverter device 130 and receive electrical energy from the energy storage inverter device 130.
[0054] In some embodiments, the grid connection device 140 may further include a heat dissipation unit, through which the internal environment of the grid connection device 140 is cooled. The heat dissipation unit includes a fan and a heat sink.
[0055] Please refer to Figure 7 , Figure 7 This is a schematic block diagram of a second power supply system provided in an embodiment of the present application, wherein the power supply system 700 includes a power distribution device 710, an electric meter 720, an energy storage inverter device 730, and a grid connection device 740. The grid connection device 740 is consistent with the grid connection device 140 of each of the above embodiments, and will not be described in detail here.
[0056] In the embodiment of the present application, the energy storage inverter device 730 includes a power conversion circuit 731 and a controller 732. The controller 732 is used to: when it is determined that the grid side is abnormal according to the second electric energy data, generate and output a disconnection instruction to the grid connection device 740; when it is determined that the grid side has returned to normal according to the second electric energy data, control the output voltage of the power conversion circuit 731 to be synchronized with the grid side according to the second electric energy data, generate and output a conduction instruction to the grid connection device 740, and after the grid connection device 740 is turned on, adjust the output power of the power conversion circuit 731 according to the first electric energy data.
[0057] It can be understood that the second electric energy data includes meter side voltage data, that is, grid side voltage data. The controller 732 controls the phase of the output voltage of the power conversion circuit 731 to be synchronized with the grid according to the grid side voltage data, and then generates and outputs a conduction instruction to the grid connection device 740.
[0058] In some embodiments, the controller 732 is further configured to control the power conversion circuit 731 to stop working when it is determined that the communication connection with the grid connection device 140 is disconnected for a preset time. That is, when the controller 732 does not receive the first power data and the second power data of the grid connection device 140 for a preset time, it can be determined that the grid connection device 140 has a fault, thereby controlling the power conversion circuit 731 of the energy storage inverter device 730 to stop working, thereby avoiding the grid connection device 140 from causing adverse effects on the energy storage inverter device 730 due to uncontrollable faults.
[0059] The energy storage inverter device 730 also includes a battery assembly 734, and the photovoltaic assembly 733 and the battery assembly 734 are respectively connected to the power conversion circuit 731. The photovoltaic assembly 733 is used to provide a photovoltaic voltage to the power conversion circuit 731. The battery assembly 734 is used to output a discharge voltage to the power conversion circuit 731, or receive a charging voltage from the power conversion circuit 731 to store electric energy.
[0060] It can be understood that the beneficial effects of the power supply system 700 in the embodiment of the present application can refer to the beneficial effects of the grid connection device in any of the aforementioned embodiments, and will not be repeated here.
[0061] The embodiments described above are merely preferred embodiments of the present application and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary technicians in this field should fall within the protection scope determined by the claims of the present application.
Claims
1. A power grid connection device, characterized in that: It is arranged between the electric meter and the power distribution equipment, connected to the electric meter and connected to the load and the power grid through the power distribution equipment; The grid connection device comprises a relay circuit, a sampling circuit and a control circuit, wherein a first end of the relay circuit is connected to the power distribution equipment, a second end of the relay circuit is connected to the electric meter, the sampling circuit is connected to the first end and the second end of the relay circuit, and the control circuit is connected to the relay circuit, the sampling circuit and the energy storage inverter equipment; The sampling circuit is used to collect first electric energy data on the load side and second electric energy data on the meter side, and transmit the first electric energy data and the second electric energy data to the control circuit; The control circuit is used for: Transmitting the first electric energy data and the second electric energy data to the energy storage inverter device; Receiving a disconnection instruction of the energy storage inverter device, controlling the relay circuit to disconnect, and transmitting disconnection state information of the relay circuit to the energy storage inverter device; Receive a conduction instruction from the energy storage inverter device, control the relay circuit to conduct, and transmit the conduction state information of the relay circuit to the energy storage inverter device.
2. The grid connection device according to claim 1, characterized in that: The grid connection device further comprises a switch button, the switch button being connected to the relay circuit, and the switch button being used to control the relay circuit to be turned on when manually triggered; The control circuit is also used to transmit the conduction state information of the relay circuit to the energy storage inverter device after the relay circuit is turned on.
3. The grid connection device according to claim 1, characterized in that: The sampling circuit includes a voltage acquisition unit and a built-in electricity meter, the first electric energy data includes load-side voltage data, and the second electric energy data includes meter-side voltage data and power data and energy data flowing from the meter into the grid connection device; The voltage acquisition unit is connected to the first end and the second end of the relay circuit, and the voltage acquisition unit is used to collect the load side voltage data and the meter side voltage data; The built-in electricity meter is connected to the second end of the relay circuit, and the built-in electricity meter is used to collect the power data and the energy data flowing from the electricity meter into the grid connection device.
4. The grid connection device according to claim 1, characterized in that: The grid connection device further comprises a grid terminal, a first electric meter terminal, a second electric meter terminal and a load side terminal; The grid terminal is used to be connected to the grid through the power distribution equipment, and connected to the first electric meter terminal; The first meter terminal and the second meter terminal are used to connect the meter, and the second end of the relay circuit is connected to the second meter terminal; The load-side terminal is connected to a first end of the relay circuit and is connected to the load through the power distribution device.
5. The grid connection device according to claim 4, characterized in that: The grid connection device also includes an auxiliary power supply, which is connected to the second meter terminal and the control circuit. The auxiliary power supply is used to obtain electrical energy from the second meter terminal and convert it into an auxiliary power supply voltage before transmitting it to the control circuit.
6. The grid connection device according to claim 1, characterized in that: The grid connection device further comprises a wireless communication unit, wherein the wireless communication unit is connected to the control circuit; The wireless communication unit is used for communication connection with the energy storage inverter device.
7. A power supply system, characterized in that: It includes a power distribution device, an electric meter, an energy storage inverter device and a grid connection device; the energy storage inverter device is connected to the grid through the power distribution device; the grid connection device is arranged between the electric meter and the power distribution device, connecting the electric meter and connecting to the load and the grid through the power distribution device; the grid connection device is communicatively connected with the energy storage inverter device; The grid connection device is used to: collect first electric energy data on the load side and second electric energy data on the electric meter side, and transmit the first electric energy data and the second electric energy data to the energy storage inverter device; disconnect the connection between the power distribution device and the electric meter when receiving a disconnection instruction, and connect the connection between the power distribution device and the electric meter when receiving a connection instruction; The energy storage inverter device is used to generate and output the disconnection instruction or the conduction instruction according to the second electric energy data.
8. The power supply system according to claim 7, characterized in that: The grid connection device comprises a relay circuit, a sampling circuit and a control circuit, wherein a first end of the relay circuit is connected to the power distribution equipment, a second end of the relay circuit is connected to the electric meter, the sampling circuit is connected to the first end and the second end of the relay circuit, and the control circuit is connected to the relay circuit, the sampling circuit and the energy storage inverter equipment; The sampling circuit is used to collect first electric energy data on the load side and second electric energy data on the meter side, and transmit the first electric energy data and the second electric energy data to the control circuit; The control circuit is used for: Transmitting the first electric energy data and the second electric energy data to the energy storage inverter device; Receiving a disconnection instruction of the energy storage inverter device, controlling the relay circuit to disconnect, and transmitting disconnection state information of the relay circuit to the energy storage inverter device; After sending the second electric energy data to the energy storage inverter device, receiving the conduction instruction of the energy storage inverter device, controlling the conduction of the relay circuit, and transmitting the conduction state information of the relay circuit to the energy storage inverter device.
9. The power supply system according to claim 7, characterized in that: The energy storage inverter device includes a power conversion circuit and a controller; The controller is used to: When it is determined that the grid side is abnormal according to the second electric energy data, generating and outputting the disconnection instruction to the grid connection device; When it is determined according to the second electric energy data that the grid side has returned to normal, controlling the output voltage of the power conversion circuit to be synchronized with the grid side according to the second electric energy data, and generating and outputting the conduction instruction to the grid connection device; After the grid connection device is turned on, the output power of the power conversion circuit is adjusted according to the first electric energy data.
10. The power supply system according to claim 9, characterized in that: The energy storage inverter device also includes a photovoltaic component and a battery component, and the photovoltaic component and the battery component are respectively connected to the power conversion circuit; The photovoltaic assembly is used to provide photovoltaic voltage to the power conversion circuit; The battery assembly is used to output a discharge voltage to the power conversion circuit, or receive a charge voltage from the power conversion circuit to store electrical energy.