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中文摘要：
为通过变桨距来较好地控制风力机功率，提出电液数字马达变桨距控制系统．采用由工控机直接控制的大功率液压马达来进行变桨距，通过开环通道实现直接的变桨距控制，并经由内部自反馈回路确保变桨距精度，而由液压回路提供变桨恒压油源．分析系统非线性特征，并针对该特征，改进极限状态机算法并用于该变桨距系统模型的辨识．在此基础上，采用实测数据进行仿真验算．结果表明，电液数字马达能够有效地进行变桨距控制，相比于传统变桨距方式，能够较好地稳定机组功率，改进的辨识算法具有较高的模型辨识精度．
英文摘要：
An electro-hydraulic digital pitch system is proposed to smooth the output power fluctuations for wind turbine. An industrial personal computer-controlled hydraulic motor with high power/mass ratio is employed to achieve the pitch control in an outer open loop of this system. An inherent feedback position control loop in this system guarantees the pitch control accuracy. A constant hydraulic circuit provides the pressure supply. System model was identified using an improved identification algorithm to deal with the nonlinearities and uncertainties associated with the pitch actions. Simulations were carried out based on practical measurements. The simulation results have verified the effectiveness and higher power control precision of this system compared to conventional pitch systems. Effectiveness of the improved identification algorithm has been also validated by simulation results.
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