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CN-120740120-B - Photovoltaic heating adapter device

CN120740120BCN 120740120 BCN120740120 BCN 120740120BCN-120740120-B

Abstract

The application provides a photovoltaic heating adapter device which comprises a power module, a driving circuit, a signal acquisition circuit, a power tracking circuit, a temperature control circuit, an interface control circuit, a key control circuit, a liquid crystal display circuit, a control unit and a control power supply input circuit. The control unit analyzes according to the voltage, current and power of the photovoltaic and load, controls the output of the power device through the driving circuit according to the MPPT algorithm, directly drives the heating body to enable the load to track the power change of the photovoltaic cell to change, and enables the photovoltaic cell to always work on the maximum power point. The photovoltaic heating adapter device provided by the application has the advantages of high practicability, strong safety and stable running balance, utilizes the photovoltaic to heat the heating body, well saves a large amount of energy sources, is applied to a thermal circulation system, and improves the heat energy efficiency.

Inventors

  • GUO XIAOFENG
  • CUI SHIYAO

Assignees

  • 四平汉丰节能科技有限公司

Dates

Publication Date
20260508
Application Date
20250628

Claims (7)

  1. 1. The photovoltaic heating adapter device is characterized by comprising a power module, a power tracking circuit, a signal acquisition circuit, a driving circuit and a control unit; the input end of the power module is used for being connected with the output end of the photovoltaic cell, and the output end of the power module is used for supplying power for the heating body; the power tracking circuit is configured to collect an actual output voltage and an actual output current of the photovoltaic cell; The signal acquisition circuit is configured to acquire an actual output voltage and an actual output current of the power module; The control unit is configured to: Determining a maximum power point of the photovoltaic cell and a target output voltage of the photovoltaic cell corresponding to the maximum power point by adopting an MPPT algorithm based on the actual output voltage and the actual output current of the photovoltaic cell and the actual output voltage and the actual output current of the power module; determining a control signal of a power module based on the maximum power point of the photovoltaic cell and the target output voltage of the photovoltaic cell corresponding to the maximum power point; outputting the control signal to the driving circuit so that the driving circuit drives the power module to output power according to first power, wherein the first power is power corresponding to the maximum power point of the photovoltaic cell; The power module comprises a DC-DC circuit and a DC-AC circuit which are sequentially connected, and each switching tube in the power module comprises a first switching tube in the DC-DC circuit and a second switching tube in the DC-AC circuit; the control unit is specifically further configured to: The modulation ratio of the DC-AC circuit is the ratio between the peak value of the output voltage of the alternating current side and the voltage of the direct current side of the DC-AC circuit; determining a target output voltage of the DC-DC circuit based on the target output voltage of the power module and a reference value of a modulation ratio of the DC-AC circuit; Determining a duty cycle of the first switching tube based on a target output voltage of the DC-DC circuit, and determining a duty cycle of the second switching tube based on a target output voltage of the power module; the MPPT algorithm specifically adopts a random voltage disturbance method, wherein the determination mode of the voltage disturbance step length comprises the following steps: Determining the change amount of the slope of a V-I curve of the photovoltaic cell based on voltage and current data respectively corresponding to a plurality of continuous acquisition periods, wherein the voltage and current data corresponding to each acquisition period comprises the actual output voltage and the corresponding actual output current of the photovoltaic cell in the acquisition period; If the change amount of the slope of the V-I curve of the photovoltaic cell is smaller than or equal to a change amount threshold value, setting the voltage disturbance step length as a first step length; if the change amount of the slope of the V-I curve of the photovoltaic cell is larger than a change amount threshold, setting the voltage disturbance step length to be a second step length, wherein the second step length is larger than the first step length; the change amount threshold is calculated by adopting the following second formula: Wherein, the The threshold value of the amount of change is indicated, A reference value representing the threshold value of the amount of change, Indicating a preset first temperature coefficient of the temperature, Indicating a preset second temperature coefficient of the temperature, Indicating the temperature of the photovoltaic cell.
  2. 2. The photovoltaic heating adapter apparatus of claim 1, further comprising an interface control circuit, the control unit further configured to: determining a target power based on a first difference between the actual heating temperature and the target heating temperature; And if the ratio of the first power to the target power is smaller than a first threshold value, sending first identification information to a superior controller through the interface control circuit, so that the superior controller controls the electric auxiliary thermal module to start working.
  3. 3. The photovoltaic heating adapter apparatus of claim 2, wherein the control unit is further configured to: And if the ratio of the first power to the target power is greater than a second threshold, sending second identification information to a superior controller through the interface control circuit so that the superior controller controls the electric auxiliary thermal module to stop working, wherein the second threshold is greater than the first threshold.
  4. 4. A photovoltaic heating adapter device according to claim 2 or 3, characterized in that the control unit is further adapted to: Determining a reference value of the target power based on the actual heating temperature and the ambient temperature; determining a power increment based on a first difference between the actual heating temperature and a target heating temperature, wherein the first difference and the power increment form a positive correlation; and adjusting a reference value of the target power based on the power increment to obtain the target power.
  5. 5. The photovoltaic heating adapter apparatus according to claim 1, wherein the control unit is specifically configured to: Determining a target output voltage of the power module based on a maximum power point of a photovoltaic cell and an impedance of the heating body; Determining the duty ratio of each switching tube in the power module based on the target output voltage of the power module; and determining a control signal of the power module based on the duty ratio of each switching tube in the power module.
  6. 6. The photovoltaic heating adapter apparatus of claim 1, further comprising: and the temperature control circuit is used for detecting the temperature of the radiator in the power module in real time and controlling the start or stop of the fan based on the temperature of the radiator.
  7. 7. The photovoltaic heating adapter apparatus of claim 1, further comprising: the key control circuit is used for inputting the adjustment parameters by a user; and the liquid crystal display circuit is used for inputting the adjusting parameters by a user and displaying the operating parameters of the photovoltaic heating adapter device.

Description

Photovoltaic heating adapter device Technical Field The application belongs to the technical field of energy conservation, and particularly relates to a photovoltaic heating adapter device. Background In the heating field, the modern electric boiler heating technology has been greatly advanced in recent years, and has been widely applied in various industries. At present, a plurality of manufacturers in China are engaged in the development and the application of the technology in production, and the technology has very good prospects for saving electricity, improving production efficiency and improving working environment. In order to further reduce the energy consumption of the heating system, a new heating system solution is needed. Disclosure of Invention The application aims to provide a photovoltaic heating adapter device for reducing energy consumption of a heating system. The photovoltaic heating adapter device comprises a power module, a power tracking circuit, a signal acquisition circuit, a driving circuit and a control unit; the input end of the power module is used for being connected with the output end of the photovoltaic cell, and the output end of the power module is used for supplying power for the heating body; the power tracking circuit is configured to collect an actual output voltage and an actual output current of the photovoltaic cell; The signal acquisition circuit is configured to acquire an actual output voltage and an actual output current of the power module; The control unit is configured to: Determining a maximum power point of the photovoltaic cell and a target output voltage of the photovoltaic cell corresponding to the maximum power point by adopting an MPPT algorithm based on the actual output voltage and the actual output current of the photovoltaic cell and the actual output voltage and the actual output current of the power module; determining a control signal of a power module based on the maximum power point of the photovoltaic cell and the target output voltage of the photovoltaic cell corresponding to the maximum power point; and outputting the control signal to the driving circuit so that the driving circuit drives the power module to output power according to first power, wherein the first power is the power corresponding to the maximum power point of the photovoltaic cell. In one embodiment of the application, the photovoltaic heating adapter apparatus further comprises an interface control circuit, the control unit further being adapted to: determining a target power based on a first difference between the actual heating temperature and the target heating temperature; And if the ratio of the first power to the target power is smaller than a first threshold value, sending first identification information to a superior controller through the interface control circuit, so that the superior controller controls the electric auxiliary thermal module to start working. In an embodiment of the application, the control unit is further adapted to: And if the ratio of the first power to the target power is greater than a second threshold, sending second identification information to a superior controller through the interface control circuit so that the superior controller controls the electric auxiliary thermal module to stop working, wherein the second threshold is greater than the first threshold. In an embodiment of the application, the control unit is further adapted to: Determining a reference value of the target power based on the actual heating temperature and the ambient temperature; determining a power increment based on a first difference between the actual heating temperature and a target heating temperature, wherein the first difference and the power increment form a positive correlation; and adjusting a reference value of the target power based on the power increment to obtain the target power. In an embodiment of the present application, the MPPT algorithm specifically adopts a random voltage disturbance method, where a method for determining a voltage disturbance step includes: Determining the change amount of the slope of a V-I curve of the photovoltaic cell based on voltage and current data respectively corresponding to a plurality of continuous acquisition periods, wherein the voltage and current data corresponding to each acquisition period comprises the actual output voltage and the corresponding actual output current of the photovoltaic cell in the acquisition period; If the change amount of the slope of the V-I curve of the photovoltaic cell is smaller than or equal to a change amount threshold value, setting the voltage disturbance step length as a first step length; And if the change amount of the slope of the V-I curve of the photovoltaic cell is larger than the change amount threshold, setting the voltage disturbance step length as a second step length, wherein the second step length is larger than the first step length. In one embodiment of the pr