A distributed photovoltaic inverter system

Abstract

The application provides a distributed photovoltaic inverter system, comprising an MPPT module, which realizes distributed networking of photovoltaic components, dynamically draws the maximum output power of photovoltaic panels by real-time impedance adjustment; a DC-DC boost module, which boosts low-voltage direct current generated by the photovoltaic components to reach the working standard bus voltage of the inverter; a DC-AC inverter, which is connected with the DC-DC boost module and a main controller through wires, and is used for cutting flat direct current into sinusoidal alternating current; and an LC filter circuit, which is connected with the DC-AC boost module, household appliances and a public power grid through wires, filters out the noise of the alternating current, outputs a smooth standard sinusoidal wave, and avoids alternating current pollution to household appliances and the public power grid. The application realizes distributed networking of multiple photovoltaic components, reduces the line, is convenient for maintenance and arrangement, and reduces the use cost.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic inverter technology, and more particularly to a distributed photovoltaic inverter system. Background Technology

[0002] A photovoltaic inverter, also known as a power regulator, is an inverter that converts the variable DC voltage generated by photovoltaic solar panels into AC power at the mains frequency. It is one of the balancing components of a photovoltaic array system.

[0003] In existing technologies, when photovoltaic modules generate direct current and are connected to household appliances and the public power grid, they are usually connected to the household appliances and the public power grid by a single wire. However, in a home environment, photovoltaic modules are installed on the roof, balcony or wall. If they are all connected by a single wire, it will result in too many and complicated lines, which will be inconvenient to manage and will also lead to high production costs. Summary of the Invention

[0004] The present invention aims to provide a distributed photovoltaic inverter system that overcomes or at least partially solves the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution of the present invention is specifically implemented as follows: This invention provides a distributed photovoltaic inverter system, comprising, The MPPT module is connected to multiple sets of photovoltaic modules, and there is a one-to-one correspondence between the photovoltaic modules and the MPPT module, so as to realize distributed networking of photovoltaic modules and dynamically pull the maximum output power of photovoltaic panels by adjusting the impedance in real time. The DC-DC boost module is connected to the MPPT module via wires. It boosts the low-voltage DC power generated by the photovoltaic module to achieve the standard bus voltage for inverter operation. The DC-AC inverter is connected to the DC-DC boost module and the main controller via wires. It is used to cut the flat DC power into sinusoidal AC power and match it with the mains power. The LC filter circuit is connected to the DC-AC boost module, home appliances, and public power grid via wires. It filters out noise from the passing AC power, outputs a smooth standard sine wave, and transmits the AC power to the home appliances and public power grid, while preventing AC power from polluting the home appliances and public power grid. The main controller is used to control the MPPT, DC-AC inverter, phase-locked grid connection, all protection logic, and data operations; The voltage sampling sensor and the current sampling sensor are respectively connected to the DC-DC boost module and the DC-AC inverter, and collect the DC and AC voltage and current in real time and transmit them to the main controller to determine the operating conditions.

[0006] As a further aspect of the present invention, it also includes a temperature detection sensor and a heat dissipation module. The temperature detection sensor is connected to the main controller via a wire, and the main controller is connected to the heat dissipation module via a wire. Both the temperature detection sensor and the heat dissipation module are installed on the DC-AC inverter. The heat dissipation of the DC-AC inverter is monitored in real time, and heat is dissipated as needed.

[0007] As a further aspect of the present invention, a communication module is also included. The communication module is connected to the main controller via a wire, and the through-hole module is selected from WIFI, 4G, and 5G for uploading power generation and fault information to a mobile APP.

[0008] As a further aspect of the present invention, a DC terminal block is also included, which is connected to the MPPT module and connected to the photovoltaic module through it.

[0009] As a further embodiment of the present invention, it also includes a fuse and a reverse connection protection device. The fuse and the reverse connection protection device are both connected between the DC terminal block and the MPPT module to realize fuse protection of the whole machine in case of overload or short circuit, and to prevent the photovoltaic positive and negative terminals from being reversed and burning out the equipment.

[0010] This invention provides a distributed photovoltaic inverter system, which has the following advantages: it enables distributed networking of multiple photovoltaic modules, reduces the number of lines, facilitates maintenance and organization, and also reduces the cost of use; Voltage and current sampling sensors can be used to collect data on the passing DC and AC current in real time and determine their operating conditions. Temperature monitoring and heat dissipation protection can be achieved by using temperature sensors and heat dissipation modules to monitor the operation of DC-AC inverters. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a block diagram illustrating the working principle of the present invention.

[0013] In the diagram: 1. Main controller; 2. MPPT module; 3. DC-DC boost module; 4. DC-AC inverter; 5. LC filter circuit; 6. Voltage sampling sensor; 7. Current sampling sensor; 8. Temperature detection sensor; 9. Heat dissipation module; 10. Communication module. Detailed Implementation

[0014] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0015] See Figure 1 The present invention provides a distributed photovoltaic inverter system, comprising: MPPT module 2 is connected to multiple photovoltaic modules, and there is a one-to-one correspondence between the photovoltaic modules and MPPT module 2, so as to realize distributed networking of photovoltaic modules and dynamically pull the maximum output power of photovoltaic panels by adjusting the impedance in real time. DC-DC boost module 3 is connected to MPPT module 2 via wires. It boosts the low-voltage DC power generated by the photovoltaic module to reach the standard bus voltage of the inverter. DC-AC inverter 4 is connected to DC-DC boost module 3 and main controller 1 via wires. It is used to cut the flat DC power into sinusoidal AC power and match it with the mains power. The LC filter circuit 5 is connected to the DC-AC boost module, home appliances, and public power grid via wires. It filters out noise from the passing AC power, outputs a smooth standard sine wave, and transmits the AC power to the home appliances and public power grid, while preventing AC power from polluting the home appliances and public power grid. Main controller 1 is used to control MPPT, DC-AC inverter 4, phase-locked grid connection, all protection logic and data operation; Voltage sampling sensor 6 and current sampling sensor 7 are connected to DC-DC boost module 3 and DC-AC inverter 4 respectively, and collect the DC and AC voltage and current in real time, and transmit them to main controller 1 to determine the operating conditions.

[0016] It also includes a temperature detection sensor 8 and a heat dissipation module 9. The temperature detection sensor 8 is connected to the main controller 1 via a wire, and the main controller 1 is connected to the heat dissipation module 9 via a wire. Both the temperature detection sensor 8 and the heat dissipation module 9 are installed on the DC-AC inverter 4. The heat dissipation of the DC-AC inverter 4 is monitored in real time and heat is dissipated at any time.

[0017] It also includes a communication module 10, which is connected to the main controller 1 via a wire. The through-hole module is selected from WIFI, 4G, and 5G and is used to upload power generation and fault information to a mobile APP.

[0018] It also includes a DC terminal block, which is connected to the MPPT module 2 and connected to the photovoltaic module through it.

[0019] It also includes fuses and reverse connection protection devices. Both fuses and reverse connection protection devices are connected between the DC terminal block and the MPPT module 2 to achieve fuse protection of the whole machine in case of overload or short circuit, and to prevent the photovoltaic positive and negative terminals from being reversed and burning out the equipment.

[0020] In the process of using this invention, the DC terminal block is first connected to the MPPT module 2 to connect the photovoltaic modules to the MPPT module 2. The MPPT module 2 corresponds one-to-one with the photovoltaic modules, enabling distributed networking of photovoltaic modules in different locations. Then, the MPPT module 2, DC-DC boost module 3, DC-AC inverter 4, and LC filter circuit 5 are connected to the main controller 1. This allows the DC power generated by the photovoltaic modules to be boosted to the inverter's standard operating bus voltage, then converted to AC power. Noise in the AC power is filtered out to produce a smooth, standard sine wave output. Finally, the AC power is connected to household appliances and the public power grid. Voltage sampling sensor 6 and current sampling sensor 7 collect the DC and AC voltage and current in real time and transmit them to the main controller 1 to determine the operating condition. Temperature detection sensor 8 and heat dissipation module 9 monitor the heat dissipation of the DC-AC inverter 4 in real time and provide cooling as needed. Communication module 10 is used to upload power generation and fault information to a mobile app.

[0021] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A distributed photovoltaic inverter system, characterized in that, include, MPPT module (2), the MPPT module (2) is connected to multiple photovoltaic modules, and the photovoltaic modules correspond one-to-one with the MPPT module (2) to realize distributed networking of photovoltaic modules, and dynamically pull the maximum output power of photovoltaic panels by adjusting the impedance in real time; DC-DC boost module (3), the DC-DC boost module (3) is connected to MPPT module (2) through wires, and boosts the low-voltage DC power generated by photovoltaic module to reach the standard bus voltage of inverter operation; DC-AC inverter (4), which is connected to DC-DC boost module (3) and main controller (1) through wires, is used to cut flat DC power into sinusoidal AC power and match it with the mains power. The LC filter circuit (5) is connected to the DC-AC boost module, home appliances and public power grid respectively through wires. It filters out noise from the AC power and outputs a smooth standard sine wave. It also transmits the AC power to the home appliances and public power grid and avoids AC power pollution to the home appliances and public power grid. The main controller (1) is used to control the MPPT, DC-AC inverter (4), phase-locked grid connection, all protection logic and data operation; Voltage sampling sensor (6) and current sampling sensor (7) are connected to DC-DC boost module (3) and DC-AC inverter (4) respectively, and collect the DC and AC voltage and current in real time and transmit them to the main controller (1) to determine the operating conditions.

2. The distributed photovoltaic inverter system according to claim 1, characterized in that, It also includes a temperature detection sensor (8) and a heat dissipation module (9). The temperature detection sensor (8) is connected to the main controller (1) via a wire, and the main controller (1) is connected to the heat dissipation module (9) via a wire. Both the temperature detection sensor (8) and the heat dissipation module (9) are installed on the DC-AC inverter (4). The heat dissipation of the DC-AC inverter (4) is monitored in real time and heat is dissipated at any time.

3. A distributed photovoltaic inverter system according to claim 1, characterized in that, It also includes a communication module (10), which is connected to the main controller (1) via a wire, and the through-hole module is selected from WIFI, 4G and 5G, and is used to upload power generation and fault information to the mobile APP.

4. A distributed photovoltaic inverter system according to claim 1, characterized in that, It also includes a DC terminal block, which is connected to the MPPT module (2) and connected to the photovoltaic module through it.

5. A distributed photovoltaic inverter system according to claim 2, characterized in that, It also includes fuses and reverse connection protection devices. The fuses and reverse connection protection devices are connected between the DC terminal block and the MPPT module (2) to realize fuse protection of the whole machine in case of overload or short circuit, and to prevent the photovoltaic positive and negative terminals from being reversed and burning out the equipment.

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