Fault-tolerant wide-area control for power oscillation damping

Abstract

Abstract-In this paper, the effectiveness of using both local and remote (wide-area) feedback signals for power oscillation damping (POD) controllers is shown. However, the challenge is to guarantee a minimum level of dynamic performance with only the local signal following sudden loss of remote signals. A case study on the Nordic equivalent system is presented to show that the closed-loop response could deteriorate once the remote signals are lost. A fault-tolerant control (FTC) design methodology is presented to solve this problem and ensure an acceptable performance level even in case of loss of remote signals. The FTC design methodology is based on simultaneous pole-placement for normal and loss of (remote) signals conditions along with minimisation of control effort. The problem is solved non-iteratively using Linear Matrix Inequalities (LMIs). Under the normal condition (when both local and remote signals are present) the fault-tolerant controller (FTC) requires more control effort as compared to a conventional controller (CC) in order to achieve the same performance. However, case studies on the Nordic equivalent system confirm that the proposed FTC is able to produce acceptable performance in case of loss of the remote signals while the response with a CC is unacceptable.

Wide area control in electric power systems incorporating FACTS controllers: Review

“…Additionally, in order to analyze these effects, Pade approximation and eigenvalue analysis method are proposed. The authors of [31] propose a fault tolerant control (FTC) to ensure an acceptable performance level even in case of loss of remote signals, where the term fault is referred as loss of remote signals. The objective is to tackle this problem in terms of its adverse impact on the dynamic response of the system.…”

Semi-Active Wide-Area Fault-Tolerant Control in Electric Power Systems

“…The energy system used for validation is shown in Figure 5. For full details of the model see Chaudhuri et al (2010); Johansson et al (2009); Segundo Sevilla et al (2012b).…”

Fault‐tolerant control design to enhance damping of inter‐area oscillations in power grids

“…The constraints are the same as in (5), where in this case, θ i is the required inner angle for the ith system. A linear non-iterative algorithm to design decentralized controllers for polytopic systems was presented in [28] and implemented in [29] for FTC design. The algorithms presented have the advantage of being linear and easy to implement, although they have a potential drawback: the value of the matrix C c in the controller is calculated and fixed to the value ofĈ c Y −1 before calculating the other control matrices.…”