A Novel Emergency Power Supply Unit in MW Wind Turbine Electric Pitch System

Abstract:

An Emergency power supply unit is of great importance to an electric pitch control system especially in MW turbines. Based on a basic parallel-series shift circuit, the paper proposes a novel topology of an emergency power supply unit consisting of ultracapacitors in electric pitch system. Capacitance configuration is obtained and the percentage of efficiency improvement using parallel-series circuit is calculated. Then a control strategy involving three operating modes is established and specific parameters are shown with a flow chart. Finally a simulation of an emergency power supply unit is established and the result confirms the theory.

• Periodical: Advanced Materials Research (Volumes 608-609)
• Pages: 730-733
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.608-609.730
• Online since: December 2012
• Authors: Cheng Cheng Ye
• Keywords: Electric Pitch Control, Emergency Power Supply, Parallel-Series Shift

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