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Spindle position regulation for wind power generators

机译：风力发电机主轴位置调节

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The three-time-scale plant model of a wind power generator, including a wind turbine, a flexible vertical shaft, a variable inertia flywheel (VIF) module, an active magnetic bearing (AMB) unit and the applied wind sequence, is constructed. In order to make the wind power generator be still able to operate as the spindle speed exceeds its rated speed, the VIF is equipped so that the spindle speed can be appropriately slowed down once any stronger wind field is exerted. Currently, most of wind energy input is, as a matter of fact, a waste since the commercially available wind power generators only operate for fairly mild or low-speed wind field. To prevent any potential damage due to collision by shaft against conventional bearings, the AMB unit is proposed to replace the traditional bearings and regulate the shaft position deviation. By singular perturbation order-reduction technique, a lower-order plant model can be established for the synthesis of feedback controller. It is found that two major system parameter uncertainties, an additive uncertainty and a multiplicative uncertainty, are constituted by the wind turbine and the VIF, respectively. The upper bounds of system parameters variation can be therefore estimated and the frequency shaping sliding mode control (FSSMC) loop is proposed to account for these uncertainties and suppress the unmodeled higher-order plant dynamics. At last, the efficacy of the FSSMC is verified by intensive computer and experimental simulations for regulation on position deviation of the shaft and counter-balance of unpredictable wind disturbance.
机译：构建了风力发电机的三级规模工厂模型，包括风力涡轮机，挠性垂直轴，可变惯性飞轮（VIF）模块，主动磁轴承（AMB）单元和所应用的风序。为了使风力发电机在主轴转速超过其额定转速时仍然能够运行，配备了VIF，以便一旦施加更强的风场就可以适当降低主轴转速。实际上，当前，大多数风能输入实际上是浪费，因为市售的风力发电机仅在相当温和或低速的风场下运行。为了防止轴与传统轴承发生碰撞而造成任何潜在的损坏，建议使用AMB单元替换传统轴承并调节轴位置偏差。通过奇异摄动降阶技术，可以建立一个低阶工厂模型来合成反馈控制器。结果发现，风力涡轮机和VIF分别构成两个主要的系统参数不确定性，即加性不确定性和乘法不确定性。因此，可以估计系统参数变化的上限，并提出了频率整形滑模控制（FSSMC）环路来解决这些不确定性并抑制未建模的高阶工厂动态。最后，通过密集的计算机和实验模拟验证了FSSMC的有效性，以调节轴的位置偏差和不可预测的风扰的平衡。

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