Heating dehumidification circuit of converter and control method thereof

Abstract

The invention discloses a heating dehumidification circuit of a converter. The circuit comprises a controller circuit, a power module circuit, a power supply circuit which provides power, and a controller heating resistor and a power module heating resistor which are respectively connected to the controller circuit and the power module circuit. The controller heating resistor is arranged around the controller in the converter and carries out heating dehumidification on the controller. The controller circuit is connected to a controller and controls the controller to work. The power module heating resistor is arranged on the power module heat radiator in the converter. The controller is connected to the power module circuit and controls the power module circuit through the signal emitted by the temperature sensor and carries out heating dehumidification on the power module heat radiator. The power module heat radiator is connected to a power module and controls the power module to work. According to the heating dehumidification circuit, the risk of controller and power module damage is greatly reduced, the heating dehumidification circuit is more convenient and direct, the heating efficiency is high, the heating process is intelligent, a start-up time is reduced and rationally used, the waste of the power generation amount of a wind generating set is avoided, and the power generation efficiency of the wind generating set is increased.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a heating and dehumidification circuit of a converter and a control method thereof. Background technique [0002] The power electronic device used in the current mainstream wind turbine converter power module is the IGBT module. The core component of the IGBT module is the IGBT chip, which is packaged inside the silica gel to solve the problem of chip insulation. However, the IGBT chip is sensitive to temperature and needs to be in a relatively suitable temperature environment during operation. If the temperature is high or low, there is a risk of damage. [0003] In the existing wind turbines, low temperature and high humidity are common types of environment. In order to solve the problem of starting the fan in a high humidity or low temperature environment, especially in a long-term shutdown or standby state, the power module is damaged due to moisture...

AI Technical Summary

Problems solved by technology

[0005] As for the damage of the power module due to damp and long-term power outage or standby state, it is analyzed that it is mainly due to the long-term low temperature non-operating state, and the tightly packaged IGBT module has moisture in the contact surface gap with the radiator. Air enters, and after many days of temperature difference between day and night, condensation forms inside the gap and fuses with silica gel, resulting in a decrease in the internal insulation performance of the IGBT module and damage

Ordinary heater heating will cause the temperature of the surrounding environment of the IGBT module to rise rapidly and the relative humidity to decrease rapidly. However, the internal temperature of the IGBT module does not increase rapidly, and the condensation fused with the silica gel has not been eliminated or is still in a liquid state, and the ambient humidity has decreased. To a very low state, thereby stopping heating, the fact is that it does not solve the problem of condensation inside the IGBT module, and the risk of damage still exists

[0006] In addition, the power module is damaged due to power failure or standby for a long time at low temperature. The heater only heats the environment of the IGBT module and the module appearance. Low temperature, there is also a risk of damage when starting the machine

[0007] In addition, if the mechanical switch of temperature and humidity is removed, and the time relay is used for long-term heating, although the accumulation of time can evaporate the water inside the IGBT module and increase the temperature, but this will increase the start-up time and reduce the wind power generation. The amount of power generated, especially in seasons when the humidity is not high and the temperature is not low, or only for short-term power outage maintenance, requires the same heating time, and a large amount of power generation is lost

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