A cooling method for active power filter

Abstract

The invention discloses a radiating method for an active power filter. The fan rotating speeds of the active power filter are graded; the deviation between actual temperature values of a power device and an electric reactor in each level and the target temperature values of the power device and the electric reactor under rated current is detected in real time; the duty ratio of the fan rotating speeds under different working conditions is adjusted by adopting a PI algorithm in a dichotomy capacity-reducing manner; and the fan rotating speeds are dynamically adjusted to achieve the purpose of intelligent heat dissipation. According to the radiating method for the active power filter, the fan of the active power filter can be in the optimal rotating speed, so that noise in operation can be lowered, the service life of the fan can be prolonged, and energy sources are saved as well.

Description

technical field [0001] The invention relates to a heat dissipation technology of a filter, in particular to a heat dissipation method of an active power filter. Background technique [0002] In recent years, with the increasing compensation capacity of active power filters, traditional natural air cooling has been unable to solve the heat dissipation problem caused by switching losses of power devices. At present, most of the active filter devices put into operation use forced air cooling, and the control method often adopts fixed duty cycle modulation according to the compensation feedback current. This method mainly has the following problems: [0003] 1. Determine the speed regulation of the fan according to the compensation current. Due to the large number of current divisions and the small difference in duty cycle between different gears, the fan speed regulation system is unstable and the fan makes abnormal noise. [0004] 2. The size of the compensation current has n...

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Problems solved by technology

[0003] 1. Determine the speed regulation of the fan according to the compensation current. Due to the large number of current divisions and the small difference in duty cycle between different gears, the fan speed regulation system is unstable and the fan makes abnormal noise.

[0004] 2. The size of the compensation current has no unique relationship with the heating of the active filter device. Factors such as the external ambient temperature and the switching frequency of the power device also directly affect the heating of the active filter device. For example, the temperature in winter is low and the temperature of the device is also low. There is no need to use high speed for heat dissipation, resulting in excessive noise and waste of energy

[0005] 3. Determining the speed regulation of the fan according to the current cannot guarantee the optimal speed of the active filter device, so it is difficult to solve the heat dissipation problem fundamentally, and it will also cause noise due to the high fan speed

[0006] 4. At present, most of the fan speed control tables are used to control the fan speed, which takes up too much hardware resources

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