Local area network inverter energy storage system and control method

Abstract

The invention relates to a local area network inverter energy storage system and a control method, and belongs to the field of photovoltaic technology. According to the local area network inverter energy storage system and the control method, the router is connected with the battery, the micro inverter, the electricity meter and the loads through wireless signals, and a local area network is formed through configuration; afterwards, an electric meter can be used for controlling the output power of the micro inverter through the local area network according to the state of a power grid, the working state of the battery is adjusted, and therefore the inverter energy storage system utilizing the local area network for wireless communication and the control method are achieved, the system does not need to be matched with a monitor and is achieved through wireless communication, and the energy storage efficiency is improved. The energy storage system is small in space requirement, low in equipment application and management cost, widely suitable for various application scenes, convenient to manage, and capable of improving the overall efficiency of the system.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to the field of inverter control technology, and specifically refers to a local area network inverter energy storage system and a control method. Background Art

[0002] Micro inverters generally refer to inverters with a power of less than or equal to 1000 watts in photovoltaic power generation systems. The full name is micro photovoltaic grid-connected inverters. Photovoltaic inverters convert the direct current generated by photovoltaic modules into alternating current through inverters for use by AC loads or access to the grid.

[0003] At the same time, photovoltaic panels also need to be connected to batteries to achieve energy storage.

[0004] In the existing technology, a monitor is usually used in combination with a smart meter to control the inverter output power and battery charging and discharging. However, the wiring of the monitor is complicated, the equipment application and management costs are high, and there are certain requirements for the environment and space. It is not suitable for application scenarios with a large load and insufficient wiring space.

[0005] Therefore, how to provide an inverter energy storage system and control method with small space requirements, lower equipment application and management costs, and a wide range of application scenarios has become an urgent problem to be solved in this field. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide an inverter energy storage system and control method which is implemented by using local area network wireless communication, has small space requirements, low equipment application and management costs, and has a wider range of application scenarios.

[0007] In order to achieve the above-mentioned purpose, the local area network inverter energy storage system of the present invention has the following structure:

[0008] a battery, to which power is supplied by the connected photovoltaic panel;

[0009] A micro inverter, whose input end is connected to the output end of the battery, and whose output end is connected to various loads;

[0010] An electric meter, connected between the loads and the grid, and connected to the micro-inverter and the battery through signals, for controlling the output power of the micro-inverter according to the grid status and adjusting the working status of the battery;

[0011] The router is connected to the battery, micro inverter, electric meter and each load through wireless signals to form a local area network.

[0012] In the local area network inverter energy storage system, the electric meter is used to control the output power of the micro inverter according to the battery power and the grid power.

[0013] In the local area network inverter energy storage system, the electric meter is used to control the output power of the micro inverter according to the battery power and the grid power, specifically:

[0014] When the battery is not fully charged, the battery is controlled to be in a charging-only state, that is, the battery output power x=0W, or the battery is in a charging and discharging state, that is, the battery output power x>0W,

[0015] When the battery is fully charged, the battery is controlled to be in a discharge-only state, the battery output power x>0W, and the electric meter controls the output power y of the micro inverter according to the grid power z.

[0016] In the local area network inverter energy storage system, when the battery is in a state of charging and discharging or only discharging,

[0017] When the grid power z gradually decreases and z<100W, the electric meter sends instructions to control the output power y of the micro inverter to remain unchanged;

[0018] When the load jumps and decreases, and the grid power z is less than 5W, the electric meter sends an instruction to control the micro inverter to stop generating power, and the output power of the micro inverter is y=0, and the battery is controlled to enter the charging-only state.

[0019] The present invention also provides a control method for a local area network inverter energy storage system, the method comprising the following steps:

[0020] A router is used to connect the battery, micro-inverter, electric meter and each load through wireless signals to form a local area network; the battery is powered by the connected photovoltaic panel; the micro-inverter is connected between the output end of the battery and each load;

[0021] The electric meter is used to control the output power of the micro inverter and adjust the working state of the battery according to the state of the grid to which it is connected and through the local area network.

[0022] In the control method of the local area network inverter energy storage system, the electric meter controls the output power of the micro inverter, specifically: the electric meter controls the output power of the micro inverter according to the battery power and the grid power.

[0023] In the control method of the local area network inverter energy storage system, the electric meter controls the output power of the micro inverter according to the battery power and the grid power, specifically:

[0024] When the battery is not fully charged, the battery is controlled to be in a charging-only state, that is, the battery output power x=0W, or the battery is in a charging and discharging state, that is, the battery output power x>0W,

[0025] When the battery is fully charged, the battery is controlled to be in a discharge-only state, the battery output power x>0W, and the electric meter controls the output power y of the micro inverter according to the grid power z.

[0026] In the control method of the local area network inverter energy storage system, when the battery is in a state of charging and discharging or only discharging,

[0027] When the grid power z gradually decreases and z<100W, the electric meter sends instructions to control the output power y of the micro inverter to remain unchanged;

[0028] When the load jumps and decreases, and the grid power z is less than 5W, the electric meter sends an instruction to control the micro inverter to stop generating power, and the output power of the micro inverter is y=0, and the battery is controlled to enter the charging-only state.

[0029] The LAN inverter energy storage system and control method of the invention use a router to connect batteries, micro-inverters, electric meters and various loads through wireless signals to form a local area network; then, the electric meter can be used to control the output power of the micro-inverter according to the power grid status and through the local area network, and adjust the working status of the battery, thereby realizing an inverter energy storage system and control method using LAN wireless communication. The system does not require a monitor and is implemented using wireless communication, has smaller space requirements, and has lower equipment application and management costs. It is widely applicable to various application scenarios, facilitates the management of the energy storage system, and improves the overall efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural block diagram of the local area network inverter energy storage system of the present invention;

[0031] Figure 2 It is a flow chart of a control method of a local area network inverter energy storage system of the present invention. DETAILED DESCRIPTION

[0032] In order to more clearly understand the technical content of the present invention, the following embodiments are given in detail.

[0033] See also Figure 1 FIG. 1 is a structural block diagram of the local area network inverter energy storage system of the present invention.

[0034] In one embodiment, the local area network inverter energy storage system has the following structure:

[0035] a battery, to which power is supplied by the connected photovoltaic panel;

[0036] A micro inverter, whose input end is connected to the output end of the battery, and whose output end is connected to various loads;

[0037] An electric meter, connected between the loads and the grid, and connected to the micro-inverter and the battery through signals, for controlling the output power of the micro-inverter according to the grid status and adjusting the working status of the battery;

[0038] The router is connected to the battery, micro inverter, electric meter and each load through wireless signals to form a local area network.

[0039] In a more preferred embodiment, the electric meter is used to control the output power of the micro inverter according to the battery power and the grid power.

[0040] In a further preferred embodiment, the electric meter is used to control the output power of the micro inverter according to the battery power and the grid power, specifically:

[0041] When the battery is not fully charged, the battery is controlled to be in a charging-only state, that is, the battery output power x=0W, or the battery is in a charging and discharging state, that is, the battery output power x>0W,

[0042] When the battery is fully charged, the battery is controlled to be in a discharge-only state, the battery output power x>0W, and the electric meter controls the output power y of the micro inverter according to the grid power z.

[0043] In a more preferred embodiment, when the battery is in a state of charging and discharging or only discharging,

[0044] When the grid power z gradually decreases and z<100W (this value can be set according to the specific scenario), the electric meter sends an instruction to control the output power y of the micro inverter to remain unchanged;

[0045] When the load jumps and decreases, and the grid power z is less than 5W (this value can be set according to the specific scenario), the electric meter sends an instruction to control the micro-inverter to stop generating power, and the output power of the micro-inverter y=0, and at the same time controls the battery to enter the charging-only state.

[0046] The present invention also provides a control method for a local area network inverter energy storage system. In one embodiment, the method is as follows: Figure 2 As shown, the following steps are included:

[0047] A router is used to connect the battery, micro-inverter, electric meter and each load through wireless signals to form a local area network; the battery is powered by the connected photovoltaic panel; the micro-inverter is connected between the output end of the battery and each load;

[0048] The electric meter is used to control the output power of the micro inverter and adjust the working state of the battery according to the state of the grid to which it is connected and through the local area network.

[0049] In a more preferred implementation, the electric meter controls the output power of the micro-inverter, specifically: the electric meter controls the output power of the micro-inverter according to the battery power and the grid power.

[0050] In a further preferred embodiment, the electric meter controls the output power of the micro inverter according to the battery power and the grid power, specifically:

[0051] When the battery is not fully charged, the battery is controlled to be in a charging-only state, that is, the battery output power x=0W, or the battery is in a charging and discharging state, that is, the battery output power x>0W,

[0052] When the battery is fully charged, the battery is controlled to be in a discharge-only state, the battery output power x>0W, and the electric meter controls the output power y of the micro inverter according to the grid power z.

[0053] In a more preferred embodiment, when the battery is in a state of charging and discharging or only discharging,

[0054] When the grid power z gradually decreases and z<100W (this value can be set according to the specific scenario), the electric meter sends an instruction to control the output power y of the micro inverter to remain unchanged;

[0055] When the load jumps and decreases, and the grid power z is less than 5W (this value can be set according to the specific scenario), the electric meter sends an instruction to control the micro-inverter to stop generating power, and the output power of the micro-inverter y=0, and at the same time controls the battery to enter the charging-only state.

[0056] In the practical application of the local area network inverter energy storage system of the present invention,

[0057] First, configure all devices to the router and implement the local area network function through UDP communication.

[0058] The battery is charged and discharged, and the battery is connected to the micro inverter. After the micro inverter starts working, it supplies power to the load.

[0059] At the same time, the electric meter detects the current grid power to determine whether the micro inverter needs to output, and the battery is set to a charging state, a discharging state, or a charging and discharging state.

[0060] When the meter detects that the power of the grid is low, it sends a command to the micro inverter to maintain the current output power of the micro inverter or reduce the power. At the same time, it also sends a command to the battery to control the battery to charge and store the excess power.

[0061] Specifically,

[0062] When the battery is not fully charged, the battery does not output power, that is, the battery output power x = 0;

[0063] When the battery is fully charged and the battery output power x>0, the wireless meter uses automatic power control logic to control the output power y of the micro inverter according to the grid power z.

[0064] For example, the battery is in a state of charging and discharging, that is, the battery still outputs power when it is not fully charged. At this time, the battery output power x>0; the micro inverter output power y>0; and the grid power z>0.

[0065] When the grid power z starts to decrease gradually, and the grid power z < 100W, the electric meter sends a control instruction, and the micro inverter maintains the current output power y without changing;

[0066] When the household load decreases suddenly to z<5W, the electric meter sends a stop power instruction, the micro inverter stops outputting, and the power is stored in the battery.

[0067] Then re-adjust the power output to enter the state of charging and discharging at the same time;

[0068] When the battery is fully charged, the battery full charge control process is entered.

[0069] The advantages of the local area network inverter energy storage system and control method of the present invention are: no need for a monitor, and wireless communication is used to achieve a wider range of usage scenarios and facilitate management; thereby reducing energy losses and improving system efficiency.

[0070] The LAN inverter energy storage system and control method of the invention use a router to connect batteries, micro-inverters, electric meters and various loads through wireless signals to form a local area network; then, the electric meter can be used to control the output power of the micro-inverter according to the power grid status and through the local area network, and adjust the working status of the battery, thereby realizing an inverter energy storage system and control method using LAN wireless communication. The system does not require a monitor and is implemented using wireless communication, has smaller space requirements, and has lower equipment application and management costs. It is widely applicable to various application scenarios, facilitates the management of the energy storage system, and improves the overall efficiency of the system.

[0071] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A local area network inverter energy storage system, characterized in that: include: a battery, to which power is supplied by the connected photovoltaic panel; A micro inverter, whose input end is connected to the output end of the battery, and whose output end is connected to various loads; An electric meter, connected between the loads and the grid, and connected to the micro-inverter and the battery through signals, for controlling the output power of the micro-inverter according to the grid status and adjusting the working status of the battery; The router is connected to the battery, micro inverter, electric meter and each load through wireless signals to form a local area network.

2. The local area network inverter energy storage system according to claim 1, characterized in that: The electric meter is used to control the output power of the micro inverter according to the battery power and the grid power.

3. The local area network inverter energy storage system according to claim 2, characterized in that: The electric meter is used to control the output power of the micro inverter according to the battery power and the grid power, specifically: When the battery is not fully charged, the battery is controlled to be in a charging-only state, that is, the battery output power x=0W, or the battery is in a charging and discharging state, that is, the battery output power x>0W, When the battery is fully charged, the battery is controlled to be in a discharge-only state, the battery output power x>0W, and the electric meter controls the output power y of the micro inverter according to the grid power z.

4. The local area network inverter energy storage system according to claim 3, characterized in that: When the battery is in a state of charging and discharging or only discharging, When the grid power z gradually decreases and z<100W, the electric meter sends instructions to control the output power y of the micro inverter to remain unchanged; When the load jumps and decreases, and the grid power z is less than 5W, the electric meter sends an instruction to control the micro inverter to stop generating power, and the output power of the micro inverter is y=0, and the battery is controlled to enter the charging-only state.

5. A control method for a local area network inverter energy storage system, characterized in that: The following steps are involved: A router is used to connect the battery, micro-inverter, electric meter and each load through wireless signals to form a local area network; the battery is powered by the connected photovoltaic panel; the micro-inverter is connected between the output end of the battery and each load; The electric meter is used to control the output power of the micro inverter and adjust the working state of the battery according to the state of the grid to which it is connected and through the local area network.

6. The control method of the local area network inverter energy storage system according to claim 5, characterized in that: The electric meter controls the output power of the micro inverter, specifically: the electric meter controls the output power of the micro inverter according to the battery power and the grid power.

7. The control method of the local area network inverter energy storage system according to claim 6, characterized in that: The electric meter controls the output power of the micro inverter according to the battery power and the grid power, specifically: When the battery is not fully charged, the battery is controlled to be in a charging-only state, that is, the battery output power x=0W, or the battery is in a charging and discharging state, that is, the battery output power x>0W, When the battery is fully charged, the battery is controlled to be in a discharge-only state, the battery output power x>0W, and the electric meter controls the output power y of the micro inverter according to the grid power z.

8. The control method of the local area network inverter energy storage system according to claim 7, characterized in that: When the battery is in a state of charging and discharging or only discharging, When the grid power z gradually decreases and z<100W, the electric meter sends instructions to control the output power y of the micro inverter to remain unchanged; When the load jumps and decreases, and the grid power z is less than 5W, the electric meter sends an instruction to control the micro inverter to stop generating power, and the output power of the micro inverter is y=0, and the battery is controlled to enter the charging-only state.

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