Active Disturbance Rejection Control With Linear Quadratic Regulator for Power Output of Hydraulic Wind Turbines

Abstract

In this research, a new method based on Active Disturbance Rejection Control (ADRC) for controlling the power output of hydraulic wind turbines (HWT) is proposed. There are three major problems in the power control system of HWT. The first problem is the existence of multiplicative nonlinearity in the system, which is an essential nonlinearity. The second problem is that the controlled system is a non-minimum phase (NMP) system. The third problem is the wind speed with strong randomness and large fluctuation range. These three problems make it difficult for HWT to achieve power control. Therefore, in this paper, the power transmission mechanism of HWT is analyzed. Then the ADRC controller combined with the linear quadratic regulator (LQR) method is designed and the stability is proved. In the process of controller design, the multiplicative nonlinear problem is regarded as the total disturbance in ADRC. Then the extended system model of ADRC and HWT is deduced, the range of the tuning parameter b0 is calculated, and the control parameters are tuned through the LQR method. Finally, the effectiveness of the proposed method is verified through simulation experiments.

Keywords

• Multiplicative nonlinearity
• power smoothing
• hydraulic systems
• wind power generation
• ADRC