nuclear power reactors are, in nature nonlinear and time varying. these characteristics must be considered, if large power variations occur in their working regime. in this paper a robust optimal gain scheduling controller for regulating the power of a nuclear reactor has been designed and simulated. the proposed controller is capable of regulating power levels in a wide power range (10% to 100...

In this paper, stabilization of the structural system against earthquake is presented. Because the conventional PD controller is popular and simple in design, our controller is based on PD controller. The main problem of such a controller is its inability to produce desired response and instability against variations in the properties of the structural system. To obviate this issue, the neu...

In this paper, an interval Type-2 fuzzy logic based pitch angle controller is proposed for fixed speed wind energy system (WES) to maintain the aerodynamic power at its rated value. The pitch angle reference is generated by the proposed controller which can compensate the non-linear characteristics of the pitch angle to the wind speed. The presence of third dimension in the Type-2 fuzzy logic c...

This paper presents two new MATLAB-based tools for tuning fixed-structure linear control systems in the frequency domain: HINFSTRUCT and LOOPTUNE. These tools can directly tune control architectures with multiple feedback loops and multiple fixed-order, fixed-structure control elements. The controller parameters are tuned using nonsmooth H∞ optimization but little a-priori knowledge of the H∞ t...

The robust controller designed by conventional H∞ optimal control is complicated, high-order, and difficult to implement practically. In industrial applications, structures such as lead-lag compensators and PID are widely used because their structure is simple, tuning parameters are fewer, and they are lower-order. Their disadvantages are that control parameters are difficult to tune for good p...

The problem of fixed-order and fixed-structure controller tuning has been known for more than half a century and is a one of the classic problems of the control theory. Great number of papers and several monographs are devoted to this problem (e.g., Rotach et al., 1984; Datta, 1998; Datta et al., 2000; Astrom & Hagglund, 2006). Analytic methods based on information on structure and form of plan...

This paper addresses the design of robust controllers for interval systems. For that, the H∞-standard approach is combined with interval techniques in order to derive controllers that ensure robust performances. The main advantages of the proposed approach are: 1) the natural and ease of modeling of the uncertain parameters thanks to intervals, 2) the low order of the controller since it can be...

This paper presents a new algorithm for the design of linear controllers with special constraints imposed on the control gain matrix. This so called SLC (Structured Linear Control) problem can be formulated with linear matrix inequalities (LMI’s) with a nonconvex equality constraint. This class of prolems includes fixed order output feedback control, multi-objective controller design, decentral...

paper proposes a new design procedure of a fixed-structure robust controller for the joint space control of a pneumatic robot arm. The proposed technique is based on the concept of H ∞ loop shaping which is a sensible method for robust controller design. However, in conventional H ∞ loop shaping, the order of the controller is much higher than that of the plant. It is not easy to implement this...