Output Control of Three-Axis PMSG Wind Turbine Considering Torsional Vibration Using H Infinity Control

Abstract

<jats:p>Due to changes in wind, the torque obtained from the wind turbine always fluctuates. Here, the wind turbine and the rotor of the generator are connected by a shaft that is one elastic body, and each rotating body has different inertia. The difference in inertia between the wind turbine and the generator causes a torsion between the wind generator and the generator; metal fatigue and torsion can damage the shaft. Therefore, it is necessary to consider the axial torsional vibration suppression of a geared wind power generator using a permanent magnet synchronous generator (PMSG). In addition, errors in axis system parameters occur due to long-term operation of the generator, and it is important to estimate for accurate control. In this paper, we propose torque estimation using H ∞ observer and axial torsional vibration suppression control in a three inertia system. The H ∞ controller is introduced into the armature current control system (q-axis current control system) of the wind power generator. Even if parameter errors and high-frequency disturbances are included, the shaft torsional torque is estimated by the H ∞ observer that can perform robust estimation. Moreover, by eliminating the resonance point of the shaft system, vibration suppression of the shaft torsional torque is achieved. The results by the proposed method can suppress axial torsional vibration and show the effect better than the results using Proportional-Integral (PI) control.</jats:p>

Study on torsional vibration suppression effect of double‐ended driving turbo‐generator shafting structure

“…Takahashi et al . [10] used the controller as the armature current control system of the variable speed wind power generator to suppress shaft torsional vibration. Gao et al .…”

“…Wang et al [9] proposed an independent modal space robust control of the torsional vibration of turbo-generator shafts based on H ∞ control theory. Takahashi et al [10] used the H ∞ controller as the armature current control system of the variable speed wind power generator to suppress shaft torsional vibration. Gao et al [11,12] proposed a torsional vibration active control scheme based on optimal control theory for suppressing the torsional vibration of large turbo-generator shafts under electrical disturbance and steam disturbance.…”

Reduced-Order Extended State Observer-Based Sliding Mode Control for All-Clamped Plate Using an Inertial Actuator

“…However, modeling errors inevitably exist in the actual vibration experiment because of the uncertainty of model parameters, complex boundary conditions, measurement noise, unknown external forces and high order harmonics [15]. Therefore, controllers relying on models are difficult for obtaining satisfactory control results with total disturbances [16][17][18]. In the last few decades, many active vibration control methods have been proposed to address the challenges of total disturbances and nonlinearity [19,20].…”

Archives of Control Sciences

“…The reduction is helpful in decreasing computational effort during simulation, designing simpler controller, better understanding of the system, etc. [5,6].…”