Generator port multifunction multiplexing system of an inverter

Abstract

The application discloses a generator port multifunctional multiplexing system of an inverter, which comprises a relay, a current sensor, a generator port connector and a control unit; the generator port connector is connected with a generator, and the generator port connector is connected with a power grid through the relay; the current sensor is used for acquiring current data of the generator port connector; the control unit is used for selecting a use mode of the generator port connector according to user demand, and performing corresponding operation according to the use mode; the use mode of the generator port connector comprises a generator port and a load port; as the generator port, the generator port connector provides electric energy generated by the generator to a load and / or an energy storage unit; as the load port, the generator port connector provides electric energy of an energy storage unit and / or a clean energy unit to the load.

Description

Technical Field

[0001] This invention belongs to the field of inverter technology, specifically relating to a multi-functional multiplexing system for the generator port of an inverter. Background Technology

[0002] like Figure 1 As shown, in existing inverter generator port solutions, this port is typically only used to connect a generator or is idle. When a generator is connected, the inverter can only absorb energy from the generator; however, when no generator is needed, the port is idle, preventing clean energy from reaching its maximum efficiency.

[0003] Furthermore, when the battery is fully charged, the inverter cannot effectively utilize the energy extracted from the solar panels and can only reduce or stop absorbing it. For users who want to maximize the use of photovoltaic clean energy and reduce their dependence on the grid, this limitation leads to the waste of excess clean energy. Summary of the Invention

[0004] Purpose of the invention: To address the shortcomings of existing inverter generator port solutions, this invention proposes a multi-functional multiplexing system for inverter generator ports. This system enables inverter generator ports to have dual functions of diesel generator control and intelligent load management. While meeting the generator usage requirements, loads can be connected to the generator ports, and the inverter can intelligently provide clean energy, further improving the utilization rate of clean energy.

[0005] Technical Solution: This invention proposes a multi-functional multiplexing system for the generator port of an inverter, comprising: a relay, a current sensor, a generator port connector, and a control unit; the generator port connector is connected to the generator, and the generator port connector is connected to the grid port connector inside the inverter via a relay, and is connected to the external power grid through the grid port connector; the current sensor is used to acquire current data connected to the generator port connector; specifically, the generator port connector is connected to the grid port circuit inside the inverter via a relay, and is then connected to the grid port connector through the grid port circuit, and is connected to the external power grid through the grid port connector; the grid port circuit includes, but is not limited to, a relay and an EMC filter circuit.

[0006] The control unit is used to select the usage mode of the generator port connector according to user needs, and to perform corresponding operations according to the usage mode; the usage modes of the generator port connector include being used as a generator port and being used as a load port;

[0007] Perform the corresponding operations according to the usage method, including:

[0008] As a generator port, it forms an energy transfer path to supply the electrical energy generated by the generator to the load and / or energy storage unit;

[0009] As a load port, it forms an energy transfer path that supplies electrical energy from energy storage units and / or clean energy units to the load.

[0010] Furthermore, the provision of electrical energy generated by the generator to the load and / or energy storage unit as a generator port includes:

[0011] Determine whether the conditions for starting the generator are met. If not, disconnect the relay. If they are met, set the dry contact and further identify whether the generator port is successfully connected to the generator. If not, disconnect the relay. If successfully connected, provide the electrical energy generated by the generator to the load and / or energy storage unit.

[0012] Furthermore, the provision of electrical energy from the energy storage unit and / or clean energy unit to the load as a load port includes:

[0013] Obtain the voltage or remaining power of the energy storage unit;

[0014] The power status of the clean energy unit is obtained based on the maximum power point obtained by the real-time maximum power point tracking algorithm and the voltage status of the DC bus. The power status of the clean energy unit is either that there is excess clean energy or that there is no excess clean energy.

[0015] The relay is disconnected and the energy transfer path that supplies power from the energy storage unit and / or the clean energy unit to the load is closed only if the voltage or remaining power of the energy storage unit is below a set threshold and the power status of the clean energy unit is such that there is no excess clean energy; otherwise, the relay is closed and power from the energy storage unit and / or the clean energy unit to the load is supplied.

[0016] Furthermore, the provision of electrical energy from the energy storage unit and / or clean energy unit to the load as a load port includes:

[0017] Obtain the voltage or remaining power of the energy storage unit;

[0018] The power status of the clean energy unit is obtained based on the maximum power point obtained by the real-time maximum power point tracking algorithm and the voltage status of the DC bus. The power status of the clean energy unit is either that there is excess clean energy or that there is no excess clean energy.

[0019] Obtain user-specific settings information; the user-specific settings information includes: always acting as a load port when the power grid is present;

[0020] When the user-defined settings indicate that the device will always act as a load port when the power grid is present, or when the clean energy unit has excess clean energy, or when the voltage or remaining power of the energy storage unit is not lower than a set threshold, the relay is closed to supply power from the power grid, the energy storage unit, or the clean energy unit to the load; otherwise, the relay is opened to close the energy transfer path that supplies power from the energy storage unit and / or the clean energy unit to the load.

[0021] Furthermore, the control unit is also used to determine whether the load has a fault based on the current data obtained by the current sensor when the generator port connector is used as a load port and the relay is closed. If a fault occurs, the relay is disconnected; if no fault occurs, the power from the grid, energy storage unit, or clean energy unit is supplied to the load.

[0022] Beneficial effects: Compared with existing technologies, this invention enables the inverter generator port to have dual functions of diesel generator control and intelligent load management. While meeting the generator's usage requirements, it allows loads to be connected to the generator port, with the inverter intelligently providing clean energy, further improving the utilization rate of clean energy. Furthermore, while achieving dual functions, it also features current monitoring, facilitating electricity consumption statistics, and can quickly disconnect the power supply line upon detecting short circuits or other hazards, ensuring personal and property safety. Attached Figure Description

[0023] Figure 1 A schematic diagram showing the usage of the existing inverter generator port;

[0024] Figure 2 A schematic diagram of the multi-functional multiplexing of the generator port in a new type of inverter;

[0025] Figure 3 This is a schematic diagram of the hardware circuit of the entire system containing a new type of inverter generator multi-functional multiplexed port. Detailed Implementation

[0026] The technical solution of the present invention will now be further described in conjunction with the accompanying drawings and embodiments.

[0027] This invention provides a method for multiplexing the generator port of an inverter, comprising:

[0028] Step 1: Set up as follows Figure 3 The generator port circuit shown is as follows. Figure 3The area within the dashed box represents the generator port circuit, which consists of a relay, a Hall current sensor, and a port connector. The Hall current sensor detects the load current to obtain power information and helps determine if a short circuit has occurred at the smart load, allowing for timely disconnection of the relay and thus cutting off the power supply to ensure personal and property safety. Specifically, the port connector connects to the generator, and this generator port connector is connected via a relay to the inverter's internal grid port connector and related circuitry, ultimately connecting to the external power grid.

[0029] Step 2: Select the appropriate usage mode for the generator port based on your needs, and set the relevant parameters accordingly. In this step, the usage modes include: generator function or smart load function.

[0030] Step 3: Enter the function execution program. If the generator port is selected as the intelligent load, the load at the generator port will be intelligently powered according to the set parameters, and the load current, power and other information will be synchronized to the LCD and the background monitoring platform for easy statistics and display of power consumption.

[0031] The generator logic judgment program executes, determining whether there is excess clean energy based on the set parameters, including:

[0032] (1) Use battery voltage or battery SOC as the basis for judgment;

[0033] (2) By using the real-time maximum power point tracking (MPPT) algorithm, the voltage-current curve of the solar panel is used to determine whether the maximum power point has been reached. At the same time, the characteristic that the DC bus will have a certain degree of voltage rise when the energy generated by the photovoltaic panel is not used up is used to determine whether the solar panel has excess clean energy.

[0034] If the battery voltage or battery SOC is detected to be below the set threshold and the solar panel has no excess clean energy, the smart load output will be automatically shut off, so that clean energy is given priority to important loads and the continuous and stable operation of important loads is guaranteed.

[0035] In this embodiment of the invention, the smart load function can also be freely selected by the user, including whether it always runs when connected to the power grid. For example, if the user selects to always run the smart load when the power grid is present, the smart load will be powered even if there is no clean energy, and the energy comes from the power grid; otherwise, the power supply line will be disconnected and the power supply to the smart load will stop when there is no clean energy.

[0036] If there is excess clean energy available, or if the smart load is always running and the grid is present as configured, the port relay closes to execute the smart load function, including: monitoring the smart load current, calculating the smart load power, detecting the smart load port voltage and current information, and determining whether the smart load has a short circuit or other fault. If a fault occurs, the port relay opens, and the inverter enters a fault state. If no fault occurs, the excess energy from the solar panel or battery is supplied to the smart load.

[0037] If the generator port is selected for use as a power generation device such as a diesel generator, power is supplied to the important load and battery according to the set parameters, including: whether the conditions for starting the generator are met. If not, the generator port relay is disconnected and the generator port is in an idle state. If the conditions are met, the dry contact is set to further identify whether the generator port is successfully connected to the generator. If not, the generator port relay is disconnected and the generator port is in an idle state. If successful, the generator's energy is supplied to the important load and battery.

[0038] like Figure 2 As shown, embodiments of the present invention enable the inverter to autonomously switch the use of the generator port according to different needs, either connecting to a generator or a smart load, while ensuring the power supply to critical loads. When connecting to a smart load, excess energy in the system can be provided to the smart load, further improving the clean energy utilization rate of solar energy and reducing the amount of grid power used, thus saving on electricity costs.

Claims

1. A multi-functional multiplexing system for the generator port of an inverter, characterized in that: include: Relays, current sensors, generator port connectors, and control units; The generator port connector is connected to the generator, and the generator port connector is connected to the grid port connector inside the inverter through a relay, and is connected to the external power grid through the grid port connector. The current sensor is used to acquire the current data connected to the generator port connector. The control unit is used to select the usage mode of the generator port connector according to user needs, and to perform corresponding operations according to the usage mode; The generator port connector can be used as a generator port and as a load port. Perform the corresponding operations according to the usage method, including: As a generator port, it forms an energy transfer path to supply the electrical energy generated by the generator to the load and / or energy storage unit; As a load port, it forms an energy transfer path that supplies electrical energy from energy storage units and / or clean energy units to the load.

2. The multi-functional multiplexing system for the generator port of an inverter according to claim 1, characterized in that: The generator port, which supplies electrical energy generated by the generator to the load and / or energy storage unit, includes: Determine whether the conditions for starting the generator are met. If not, disconnect the relay. If they are met, set the dry contact and further identify whether the generator port is successfully connected to the generator. If not, disconnect the relay. If successfully connected, provide the electrical energy generated by the generator to the load and / or energy storage unit.

3. The multi-functional multiplexing system for the generator port of an inverter according to claim 1, characterized in that: The function of serving as a load port to supply electrical energy from the energy storage unit and / or clean energy unit to the load includes: Obtain the voltage or remaining power of the energy storage unit; The power status of the clean energy unit is obtained based on the maximum power point obtained by the real-time maximum power point tracking algorithm and the voltage status of the DC bus. The power status of the clean energy unit is either that there is excess clean energy or that there is no excess clean energy. The relay is disconnected and the energy transfer path that supplies power from the energy storage unit and / or the clean energy unit to the load is closed only if the voltage or remaining power of the energy storage unit is below a set threshold and the power status of the clean energy unit is such that there is no excess clean energy; otherwise, the relay is closed and power from the energy storage unit and / or the clean energy unit to the load is supplied.

4. The multi-functional multiplexing system for the generator port of an inverter according to claim 3, characterized in that: The function of serving as a load port to supply electrical energy from the energy storage unit and / or clean energy unit to the load includes: Obtain the voltage or remaining power of the energy storage unit; The power status of the clean energy unit is obtained based on the maximum power point obtained by the real-time maximum power point tracking algorithm and the voltage status of the DC bus. The power status of the clean energy unit is either that there is excess clean energy or that there is no excess clean energy. Obtain user-specific settings information; the user-specific settings information includes: always acting as a load port when the power grid is present; When the user-defined settings indicate that the device will always act as a load port when the power grid is present, or when the clean energy unit has excess clean energy, or when the voltage or remaining power of the energy storage unit is not lower than a set threshold, the relay is closed to supply power from the power grid, the energy storage unit, or the clean energy unit to the load; otherwise, the relay is opened to close the energy transfer path that supplies power from the energy storage unit and / or the clean energy unit to the load.

5. A multi-functional multiplexing system for the generator port of an inverter according to claim 4, characterized in that: The control unit is also used to determine whether the load is faulty based on the current data obtained by the current sensor when the generator port connector is used as a load port and the relay is closed. If a fault is found, the relay is disconnected; if no fault is found, the power from the grid, energy storage unit, or clean energy unit is supplied to the load.

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