Design of wide-area power system damping controllers resilient to communication failures

Abstract

Recent research has demonstrated that wide-area signals obtained using synchronized phasor measurements could be more effective than local signals in damping inter-area oscillations in large interconnected systems. To transmit wide-area signals for use in controls, communication systems are required. Communication systems are vulnerable to disruptions as a result of which the reliability of the power system could be jeopardized. In order to counteract communication failures, resiliency could be built in either the communication system or the physical system. In this paper an approach is developed to build resiliency in grid controls in the physical system. The resiliency is achieved by robustly designing a novel redundant two-input single-output (TISO) supplementary damping controller (SDC) associated with a static VAr compensator (SVC) that utilizes both a wide-area signal and a local signal to guarantee that the system is stabilized if the wide-area signal is lost. Numerical tests on the IEEE 50-generator test system have demonstrated that the proposed SDC is effective in stabilizing the system and improving grid control resiliency in response to communication failures.

Control Inversion: A Clustering-Based Method for Distributed Wide-Area Control of Power Systems

“…For the purpose of WAC, we consider P mi to be constant, and design controller using only the excitation voltage u i . I qi , I di , V i , and θ i are algebraic variables that can be eliminated from (1)(2)(3)(4) by expressing them in terms of (E qi , δ i ), i = 1, .., n, using power balance equations through a process called Kron-reduction [8]. The resulting 4n nonlinear equations can, thereafter, be used to determine the steady-state equilibrium (δ i0 , Ω i0 , E ′ qi0 , E f di0 ), i = 1, ..., n. Considering a small-signal perturbation around 1 For ease of notation, we will omit the augment t from all variables.…”

Data quality issues for synchrophasor applications Part II: problem formulation and potential solutions

“…The data loss issue may lower and even disable the performances of certain synchrophasor applications [4]. The incomplete or missing data can make the power grid unobservable and vulnerable, and even aggravate the cascading effects in large-scale blackouts [28], [38]. PMU Application Requirements Task Force at North American Synchrophasor Initiative (NASPI) has been working on standardizing and quantifying the requirements of synchrophasor applications [39].…”

“…In addition, some researches deal with the data loss issue in a positive way. For example, a predictive control strategy for wide-area damping control was presented in [28] with the consideration of data loss and other physical constraints, and a data reconstruction method using the low-rank matrix completion approach was provided in [29], in which way the lost data could be partially recovered at a control center.…”

Delay-Aware Control Designs of Wide-Area Power Networks

“…In recent literature, several researchers have looked into delay mitigation in wide-area control loops (Chaudhuri et al, 2004;Wu et al, 2002;Zhang and Vittal, 2013). Especially relevant is the recent work in Zhang and Vittal (2013) where H ∞ controllers were designed for redundancy and delay insensitivity. All of these designs are, however, based on worst-case delays, which make the controller unnecessarily restrictive, and may degrade closed-loop performance.…”