Fully digital electric variable pitch driver

Abstract

The invention discloses a fully digital electric variable pitch driver. Peripheral devices of the driver comprise a shaft tank, a variable pitch actuating motor, and an incremental coder on the output shaft of the motor; circuits of the driver comprise two parts, namely a drive circuit and a control circuit; the drive circuit comprises a rectifying circuit, an inverter circuit, a switch power supply circuit, a current and voltage detecting circuit and a relay drive circuit; and the control circuit comprises a DSP module, a CPLD module, a PWM signal drive circuit, a signal conditioning circuit, a switching value acquiring circuit, a coder signal conditioning and acquiring circuit and a communication circuit. The fully digital electric variable pitch driver directly receives a command which is sent by a fan master control and performs three-closed-loop control based on vector change and SVPWM by detecting the current signal of a motor stator and the signal of the coder so as to realize the variable pitch control of the actuating motor; and the control accuracy, the response speed and the reliability of a variable pitch system can be ensured, and then the generating efficiency and the power quality of a whole wind generating set are increased.

Description

technical field [0001] The invention relates to a pitch-variable system in a large-scale wind power generating set, especially a fully digital electric pitch-variable drive therein. Background technique [0002] Countries around the world are vigorously developing renewable energy while improving their energy structure and energy efficiency, among which wind power is the fastest growing. Vigorously developing wind power generation is one of the measures to reduce my country's carbon dioxide emissions. Therefore, the development of wind power generation will greatly reduce my country's greenhouse gas emissions and have very obvious economic and social benefits. [0003] As one of the core parts of large wind turbines, the pitch control system plays a very important role in the safe, stable and efficient operation of the turbine. Pitch change means that the blades installed on the hub of the wind turbine change the pitch angle of the blades with the help of control technology...

AI Technical Summary

Problems solved by technology

[0004] At present, a programmable logic controller (PLC) is usually used as the controller of the pitch control system, and the pitch control function is realized by controlling the frequency converter through the PLC. The electric pitch system requires high control precision, strong real-time performance, and fast computing speed

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