Pitch system for megawatt wind generating set and pitch control method thereof

Abstract

The invention discloses a pitch system for a megawatt wind generating set and a pitch control method of the pitch system. The pitch system comprises a battery charger, a direct current 24V power supply module, a direct current bus, a pitch controller, a field communication bus, a low voltage inverter, a pitch motor and a super-capacitor, wherein the super-capacitor is directly hung on the direct current bus, and the voltage of the direct current bus is reduced at the same time. According to the pitch control method, a main controller sends an instruction to the pitch controller, the pitch controller controls a pitch driver, and the pitch driver drives the pitch motor, so that a blade of the wind generating set is controlled to reach the corresponding position. The pitch system uses the super-capacitor as a backup power supply, so that the charging time is greatly shortened, the pitch system can be used in a low-temperature environment, the interval time of maintenance is prolonged, which reduces the cost; the voltage of the direct current bus of the pitch system is reduced; the number of super-capacitor modules is reduced; and the production cost of the pitch system is lowered.

Description

[0001] technical field [0002] The invention relates to the field of wind power generation, in particular to a pitch control system and a pitch control method for a megawatt wind power generating set. Background technique [0003] In order to improve the market competitiveness of megawatt wind turbines, it is necessary to improve the quality of wind turbines, reduce operation and maintenance costs, and reduce the production costs of wind turbines as much as possible. The pitch system is one of the key subsystems of megawatt-scale wind turbines. If the pitch system often fails or needs to be shut down for maintenance, it will inevitably lead to an increase in the operation and maintenance costs of megawatt-scale wind turbines. As coastal or offshore wind turbines receive more and more policy support and market attention, their high maintenance costs require their systems to have higher reliability and maintenance-free performance. As one of the key subsystems of wind turbin...

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Problems solved by technology

Above-mentioned prior art all does not solve aforementioned technical problem well, needs further improvement

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