Variable-pitch system with rectifier device

Abstract

The invention discloses a variable-pitch system with a rectifier device, which comprises an alternating current input end and a direct current output end. The variable-pitch system with the rectifier device is characterized in that the rectifier device for rectifying alternating current into direct current is arranged between the alternating current input end and the direct current output end. A capacitor for avoiding jitter during system power supply switching is connected between the rectifier device and the direct current output end. The capacitor is an electrolytic capacitor of 400V / 1000UF. The invention has the advantages that the rectifier device is additionally arranged in the variable-pitch system to certify alternating current into pulsating direct current; stable direct current is output after voltage divider and filter; the electrolytic capacitor with large capacity is chosen to reinforce the filtering effect; and the motor can run without jitter at the very moment when three phase alternating current is cut off and a back-up power comes into use.

Description

technical field [0001] The invention relates to a wind power generating equipment, in particular to a pitch-variable system with a rectifying device. Background technique [0002] As non-renewable energy is facing the dilemma of depletion worldwide, in order to meet the needs of industrial production and human life, people's attention and utilization of renewable energy such as solar energy, wind power, and hydropower have been increasing day by day. Among them, wind power generation is a relatively mature energy development technology, especially in areas such as plateaus and coastal areas, which are widely used. [0003] At present, in the variable pitch system of wind power generation, after the blades of the fan are rotated to a predetermined position, the operation method of fixing the blades at this position is generally realized by controlling the brake pads of the motor to lock the brakes. In the pitch system, the DC voltage required by the brake pads is generally r...

AI Technical Summary

Problems solved by technology

However, the selection of the electrolytic capacitor of the filter circuit plays a key role. Generally, the capacitance value is selected to be very small, which only meets the filtering effect. For the pitch control system, the brake pads must be kept longer than about 1S after the AC power supply is cut off. not closed

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