Variable propeller system of wind-driven generator set.

Abstract

The invention provides a variable propeller system of a wind-driven generator set. The variable propeller system of the wind-driven generator set comprises an engine compartment cabinet, a sliding ring, a variable propeller driver, a variable propeller motor and a variable propeller speed reducer, and further comprises a general frequency converter and a changeover switch, wherein the engine compartment cabinet receives electric energy from a tower bottom; the general frequency converter is connected to a stator unit in the wind-driven generator set and used for receiving electric energy from the wind-driven generator set and performing frequency conversion; when the variable propeller operation is required to be executed, electric energy from the engine compartment cabinet or electric energy from the general frequency converter is selectively provided to the variable propeller driver through the changeover switch; the variable propeller driver drives the variable propeller motor by using the electric energy received from the changeover switch; and the variable propeller motor further drives the variable propeller speed reducer to rotate a propeller blade to a feathering position. According to the variable propeller system disclosed by the invention, the electric energy output by an electric generator is directly utilized, the adoption of additional standby power devices is avoided, the failure rate and the cost are reduced, and the variable propeller system has stronger transferability.

Description

technical field [0001] The present invention relates to a pitch control system for a wind power generating set, more specifically, to a pitch changing system for a wind power generating set that does not require additional power backup equipment. Background technique [0002] With the development of technology, the attention and utilization of renewable energy are increasing day by day. Among them, wind power generation is a relatively mature energy technology. Wind power generation requires strong environmental adaptability, and the pitch system is one of the core components of wind power generation. At present, the pitch system of wind turbines can be divided into two categories: electric pitch system and hydraulic pitch system from the perspective of execution hardware. Among them, the electric pitch system is essentially a position tracking transmission system. [0003] There are two main functions of the pitch control system: first, when the wind speed is greater than ...

AI Technical Summary

Problems solved by technology

Otherwise, once the main power of the pitch change system fails, the wind turbine will not be able to complete feathering, which will cause the blades of the wind turbine to not be fully retracted, and even serious wind turbine accidents such as speeding will occur

[0008] Second, the cost is higher

If batteries are used, frequent replacement over a long period of time will lead to very high equipment operation and maintenance costs

If a supercapacitor is used, its one-time investment is too high, and theoretically, the capacity of a supercapacitor is less affected by the number of charges and discharges than a battery, but the actual use time is relatively short. Whether it can reach the expected 10-year life cycle remains to be seen time tested

On the other hand, the use of low-voltage motors results in larger generator sets and larger cable diameters

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