Protection system and method for pitch system during wind power grid phase loss fault

A technology for wind turbines and pitch systems, applied in wind turbines, wind turbine control, wind power generation, etc., can solve problems such as overloading of loads, potential safety hazards, and difficulty for customers to change the underlying program, so as to solve the problem of untimely propeller retraction. , improve the effect of safety
CN112594128BActive Publication Date: 2022-03-01CRRC WIND POWER(SHANDONG) CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CRRC WIND POWER(SHANDONG) CO LTD
Publication Date
2022-03-01

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Abstract

The invention discloses a system and a method for protecting a pitch system in a wind power generating set grid phase failure. The state is controlled by the auxiliary contact of the intermediate relay powered by the switching power supply; the intermediate relay is connected to the driver, and the driver can determine the input or output signal according to whether the DC bus voltage exceeds the limit. The invention can eliminate hidden dangers such as overspeed and load overrun caused by the pitch control system when the grid voltage lacks phase, and improves the safety performance and automation degree of the unit.
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Description

technical field

[0001] The invention relates to the field of wind power generation, in particular to a protection system and method for a pitch system during a phase loss fault of a power grid of a wind power generating set. Background technique

[0002] With the rapid development of the wind power industry, the installed scale and unit capacity are increasing, and it is particularly important to simultaneously improve the safety performance and automation of the unit. As an important part of the protection function of the wind turbine, the pitch control system is a necessary condition for the long-term stable operation of the equipment to complete the pitch change action in a timely and effective manner when the unit triggers a fault.

[0003] Restricted by the fact that most of the pitch system drivers are imported brands, it is difficult for customers to change the underlying program, the external power supply is uncontrollable and the internal control logic and other fac...

Claims

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