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This paper establishes a variable pitch system working force mathematical model by analyzing variable pitch wind turbine blade stress, and designs its closed-loop PID controllers combined with the actual pitch system. a fuzzy adaptive PID loop control is introduced in the variable pitch system position loop, compares with simulation torque curves which were produced by the fuzzy adaptive PID algorithm...
This paper fully describes the use and working principle of resolver, and briefly explans the common used Resolver-to-Digital Converter (RDC for short) decoding arithmetic. Based on this basis, the paper shows a simple software decoding method — the angle tracking observer. It's of low cost, strong anti-interference ability, flexible and convenient compared to the specific RDC chip; and on the other...
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