CN-121704624-B - Programmable intelligent anti-condensation method and system for photovoltaic inverter capacitor assembly

CN121704624BCN 121704624 BCN121704624 BCN 121704624BCN-121704624-B

Abstract

The embodiment of the application provides a programmable intelligent anti-condensation method and a system for a photovoltaic inverter capacitor assembly, wherein the programmable intelligent anti-condensation system for the photovoltaic inverter capacitor assembly comprises a central controller and a plurality of intelligent patches; the central controller is respectively connected with the plurality of intelligent patches, the plurality of intelligent patches are respectively arranged at different positions on the surface of the metal shell of the photovoltaic inverter capacitor, the central controller is used for generating acquisition instructions and sending the acquisition instructions to the plurality of intelligent patches, the plurality of intelligent patches are used for acquiring the temperatures and the humidities of different positions on the surface of the metal shell of the photovoltaic inverter capacitor based on the acquisition instructions, and the central controller is used for carrying out space field reconstruction, condensation risk field calculation and intelligent analysis based on the acquired temperature, humidity and position information corresponding to the plurality of intelligent patches respectively, obtaining heating instructions and heating so as to enable the surface of the metal shell to maintain a preset temperature. According to the scheme, the anti-condensation effect can be improved, and meanwhile, the energy consumption is reduced.

Inventors

WU YUDONG
WU YAJUN
XIE YU

Assignees

深圳圣融达科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260224

Claims (7)

1. A programmable intelligent anti-condensation system of a photovoltaic inverter capacitor component is characterized by comprising a central controller and a plurality of intelligent patches, wherein the central controller is respectively connected with the plurality of intelligent patches, the plurality of intelligent patches are respectively arranged at different positions on the surface of a metal shell of the photovoltaic inverter capacitor, The central controller is used for generating an acquisition instruction and sending the acquisition instruction to the plurality of intelligent patches; The intelligent patches are used for collecting temperatures and humidity of different positions of the surface of the metal shell of the photovoltaic inverter capacitor based on the collection instruction, and sending the temperatures and humidity of the different positions to the central controller; The central controller is used for acquiring the position information of the plurality of intelligent patches, carrying out space field reconstruction, condensation risk field calculation and intelligent analysis based on the temperature, the humidity and the position information to obtain a heating instruction, and sending the heating instruction to the plurality of intelligent patches; The intelligent patches are further used for heating the surface of the metal shell of the photovoltaic inverter capacitor through a heating unit in the intelligent patches based on the heating instruction so as to enable the surface of the metal shell to maintain a preset temperature; The central controller is also used for acquiring the respective temperatures of the plurality of intelligent patches, the respective humidity of the plurality of intelligent patches and the position information of the plurality of intelligent patches, carrying out space field reconstruction based on the temperatures, the humidity and the position information to obtain a temperature distribution field and a humidity distribution field on the surface of the metal shell of the photovoltaic inverter capacitor, calculating the dew point temperature of each position on the surface of the metal shell of the photovoltaic inverter capacitor based on the temperature distribution field and the humidity distribution field to generate a condensation risk field, and carrying out intelligent analysis based on the condensation risk field and the acquired historical risk field to obtain the heating instruction; The central controller is also used for preprocessing based on the condensation risk field and the acquired historical risk field, determining a global maximum condensation risk value, a global high risk area duty ratio, a risk space distribution entropy, a risk variation trend and average humidity, intelligently deciding based on the global maximum condensation risk value, the global high risk area duty ratio, the risk space distribution entropy, the risk variation trend and the average humidity through a preset neural network decision model to obtain an optimal heating mode and an optimal heating amplitude; The heating unit in each intelligent patch of the plurality of intelligent patches is a programmable heating array, wherein the programmable heating array comprises an array structure, the array structure is composed of a plane matrix formed by micro heating resistors in M rows and N columns, and each micro heating resistor is an independently controllable heat source.
2. The system of claim 1, wherein each of the plurality of smart tiles comprises a signal acquisition processing chip, a sensor acquisition unit, and an energy management unit, wherein, The signal acquisition processing chip is used for controlling the sensing acquisition unit to acquire temperature and humidity based on the acquisition instruction; the sensing acquisition unit is used for acquiring the temperature and the humidity of the surface of the metal shell of the photovoltaic inverter capacitor; the energy management unit is used for providing power for the sensing acquisition unit and managing storage and distribution of local energy.
3. The system of claim 2, wherein the sensing acquisition unit comprises a plurality of temperature and humidity compound sensing units, wherein each temperature and humidity compound sensing unit of the plurality of temperature and humidity compound sensing units comprises a thin film temperature sensor and a thin film capacitive humidity sensor; the film temperature sensor is used for collecting the temperature of the surface of the metal shell of the photovoltaic inverter capacitor; the film capacitive humidity sensor is used for collecting humidity of the surface of a metal shell of the photovoltaic inverter capacitor.
4. The system of claim 1, wherein the central controller is further configured to determine a basic weight of each micro heating resistor based on the optimal heating mode and a preset heating map, wherein the preset heating map characterizes a correspondence between the optimal heating mode and the basic weight of each micro heating resistor, calculate based on the basic weight and the heating amplitude to obtain a target PWM duty cycle of each micro heating resistor, and generate the heating instruction based on the target PWM duty cycle of each micro heating resistor.
5. The system of claim 4, wherein the programmable heating array is further configured to heat each of the micro-heating resistors based on the heating instructions.
6. A method for programmable intelligent anti-condensation of a photovoltaic inverter capacitor assembly, characterized in that it is applied to the photovoltaic inverter capacitor assembly programmable intelligent anti-condensation system according to any one of claims 1 to 5, said method comprising: Generating an acquisition instruction through a central controller; based on the acquisition instruction, acquiring the temperature and humidity of different positions of the metal shell surface of the photovoltaic inverter capacitor through a plurality of intelligent patches; Performing space field reconstruction, condensation risk field calculation and intelligent analysis based on the temperature, the humidity and the acquired position information of the intelligent patches to obtain a heating instruction; And heating the surface of the metal shell of the photovoltaic inverter capacitor by a heating unit in the intelligent patch based on the heating instruction so as to maintain the surface of the metal shell at a preset temperature.
7. The programmable intelligent anti-condensation device for the photovoltaic inverter capacitor assembly is characterized by comprising a device body, wherein the device body comprises the programmable intelligent anti-condensation system for the photovoltaic inverter capacitor assembly according to any one of claims 1-5; The apparatus body for performing the photovoltaic inverter capacitor assembly programmable intelligent anti-condensation method of claim 6.

Description

Programmable intelligent anti-condensation method and system for photovoltaic inverter capacitor assembly Technical Field The application relates to the technical field of photovoltaic inverters, in particular to a programmable intelligent anti-condensation method and system for a photovoltaic inverter capacitor assembly. Background After the photovoltaic inverter is stopped at night or in a humid environment, the internal environment temperature is reduced, and the metal shell of the internal electrolytic capacitor is high in heat capacity, so that the surface temperature is reduced below the environmental dew point at first, and the condensation point is formed. The condensation water film can drastically reduce the insulating performance of the capacitor, so that the risk of high-voltage breakdown occurs in the next power-on process, and the condensation water film is particularly prominent in coastal high-humidity areas and the like, and becomes a key problem for influencing the reliability of the inverter. At present, the mainstream condensation prevention scheme in the industry has the obvious defects that firstly, the whole heating or dehumidification in a cabinet is adopted, so that the energy consumption is huge, each capacitor is difficult to be heated uniformly, a protection dead angle exists, secondly, the control mode is extensive, the actual condensation risk on the surface of the capacitor cannot be accurately perceived and predicted usually based on a fixed threshold response, the protection is not timely or excessive energy consumption is easy to be caused, thirdly, the problems of complex system, multiple fault points, difficult maintenance and insufficient long-term reliability exist due to the fact that an external heater and a sensor are relied on. Disclosure of Invention The embodiment of the application provides a programmable intelligent anti-condensation method and system for a photovoltaic inverter capacitor assembly, which can improve the anti-condensation effect and reduce the energy consumption. The technical scheme of the application is realized as follows: In a first aspect, an embodiment of the present application provides a programmable intelligent anti-condensation system for a photovoltaic inverter capacitor assembly, where the programmable intelligent anti-condensation system for a photovoltaic inverter capacitor assembly includes a central controller and a plurality of intelligent patches, the central controller is respectively connected with the plurality of intelligent patches, and the plurality of intelligent patches are respectively installed at different positions on a metal shell surface of the photovoltaic inverter capacitor, The central controller is used for generating an acquisition instruction and sending the acquisition instruction to the plurality of intelligent patches; The intelligent patches are used for collecting temperatures and humidity of different positions of the surface of the metal shell of the photovoltaic inverter capacitor based on the collection instruction, and sending the temperatures and humidity of the different positions to the central controller; The central controller is used for acquiring the position information of the plurality of intelligent patches, carrying out space field reconstruction, condensation risk field calculation and intelligent analysis based on the temperature, the humidity and the position information to obtain a heating instruction, and sending the heating instruction to the plurality of intelligent patches; the intelligent patches are further used for heating the surface of the metal shell of the photovoltaic inverter capacitor through a heating unit in the intelligent patches based on the heating instruction, so that the surface of the metal shell maintains a preset temperature. In the system, each intelligent patch of the plurality of intelligent patches comprises a signal acquisition processing chip, a sensing acquisition unit and an energy management unit, wherein, The signal acquisition processing chip is used for controlling the sensing acquisition unit to acquire temperature and humidity based on the acquisition instruction; the sensing acquisition unit is used for acquiring the temperature and the humidity of the surface of the metal shell of the photovoltaic inverter capacitor; the energy management unit is used for providing power for the sensing acquisition unit and managing storage and distribution of local energy. In the system, the sensing acquisition unit comprises a plurality of temperature and humidity compound sensing units, wherein each temperature and humidity compound sensing unit of the plurality of temperature and humidity compound sensing units comprises a film temperature sensor and a film capacitance humidity sensor; the film temperature sensor is used for collecting the temperature of the surface of the metal shell of the photovoltaic inverter capacitor; the film capacitive humidity sens