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Measurement-based extraction of non-parametric small signal models of power transfer paths in real-time can greatly benefit wide-area control, monitoring, and protection of a power system. This paper explores the feasibility of using pulse compression (PC) probing for on-line identification of impulse responses and change detection of selected power transfer paths. These real-time schemes become possible...
We study a class of optimal control problems that are encountered in consensus and synchronization networks. These are characterized by structural constraints that arise from the lack of the absolute measurements for a part of the state vector. In order to deal with these constraints, we introduce a coordinate transformation to eliminate the average mode and assure stabilizability and detectability...
We give a length-efficient puncturing of Reed-Muller codes which preserves its distance properties. Formally, for the Reed-Muller code encoding n-variate degree-d polynomials over F_q with q gtrsim d/delta, we present an explicit (multi)-set S subseteq F_q^n of size N=mathrm {poly}(n^d/delta) such that every nonzero polynomial vanishes on at most delta N points in S. Equivalently, we give an explicit...
This paper proposes a controller for motion control of the Robotino. The proposed controller takes under consideration a noninteracting control strategy realized using a geometric approach and the flatness of the DC-Drives. Horizon, Vertical and Angular motions are considered and once the decoupling between these motions is obtained, a Model Predictive Control (MPC) strategy is used in combination...
Control system networks are increasingly being connected to enterprise level networks. These connections leave critical industrial controls systems vulnerable to cyber-attacks. Most of the effort in protecting these cyber-physical systems (CPS) from attacks has been in securing the networks using information security techniques. Effort has also been applied to increasing the protection and reliability...
In this paper, we design a distributed dynamic feedback controller that implements real-time economic optimization in power networks with tree topology. We consider the coupling between the dynamics of the power network and the appropriately formulated optimization problem in the real-time market, i.e., when the time-scale separation between markets and network dynamics fades. The design methodology...
In this paper, a new method to design a fault diagnosis based on a Fuzzy Bilinear Observer (FBO) for nonlinear systems is proposed. The nonlinear system is modeled as a Fuzzy Bilinear Model (FBM). Sufficient conditions are established in order to maximize the fault sensitivity and perturbation robustness of the residual generator. These conditions are given in Linear Matrix Inequality (LMI) terms...
In this paper, we propose locally repairable codes (LRCs) with optimal minimum distance for distributed storage systems (DSS). A two-layer encoding structure is employed to ensure data reconstruction and the designated repair locality. The data is first encoded in the first layer by any existing maximum distance separable (MDS) codes, and then the encoded symbols are divided into non-overlapping groups...
We consider the problem of noncoherent error correction in multiple-source multicast networks. We show that a distributed network error-correcting code can be designed as a subcode of a Gabidulin code. This allows the destination nodes to utilize any decoder designed using rank-metric. We show that this achieves the full capacity region of any network with up to three messages, with optimal scaling...
Automated manual transmission (AMT) and its automatic shifting is of significance on the improvement of driveline performance and reliability. Due to numbers of electrical, mechanical and vehicle longitudinal dynamics, both establishing an analytical AMT model and designing its monitoring and fault detection (MFD) system become too complicated to implement for automotive engineers and servicemen....
We consider different variants of the modified GPT cryptosystem. The main approach for increasing the security of GPT is randomizing the public key. Randomization is done through addition or concatenation of a distortion matrix to the generator matrix of the rank code or to the column scrambler.We show that all techniques are somewhat equivalent. In particular, public keys of different variants can...
The task of detecting and mitigating Cognitive Radios (CRs) operating as constant jammers in a Cognitive Radio network (CRN) can be very daunting. The CR constant jammers prey on the adaptable functionalities of CRN so as to cause serious denial of service to the users of the network. In addition, these jammers are capable of introducing value faults in pathological cases as a result of being able...
Many arithmetic circuits utilize multioperand addition, usually using carry-save adders (CSA) trees. Automatic generation of custom VHDL models for these CSA trees, allows the designer to perform a time efficient design space exploration. Although, the CSA trees are heavily utilized in modern digital circuits, there is no tool, accessible from the web, to generate the HDL description of such multioperand...
In this work we present a new scheme for the on-chip application of test patterns utilizing an accumulator structure whose inputs are driven by a barrel shifter. The consecutive patterns applied to the inputs of the Circuit Under Test differ in one bit, therefore the power consumed is lower compared to previously proposed accumulator-based pattern application schemes.
An efficient methodology for the tuning of proportional-integral controllers' gains for the generator-side converter of a wind turbine driven permanent magnet synchronous generator using a self-adaptive global best harmony search algorithm is proposed. Performance of the generator with the optimized controller parameters obtained using the proposed algorithm is compared with the parameters obtained...
Design space exploration of new circuit methodologies require the creation of models in hardware description languages to evaluate the characteristics for different parameters, a time consuming process. To alleviate the burden of HDL construction, we present a compact netlist format and a web tool that creates syntactically correct VHDL files. The designer can use our tool, together with an easy to...
Registers with Non-Linear Update (RNLUs) are a generalization of Non-Linear Feedback Shift Registers (NLFSRs) in which both, feedback and feedforward, connections are allowed and no chain connection between the stages is required. An RNLU can be used to generate any given 2p-ary sequence, p ≥ 1. In this paper, a new algorithm for constructing RNLUs is presented. Expected size of RNLUs constructed...
This paper introduces a new method of generator brake torque control during Fault Ride Through (FRT) drive for a multi level matrix converter of wind power system. It may be exist that a generator speed become over speed during FRT drive. In this case, a generator has to be fixed brake torque. In the past, generator brake torque control during FRT drive for a matrix converter is impossible. However,...
The paper presents results of the research devoted to PMU-based power system small-signal stability monitoring. Proposed method allows tracking in-phase groups of generators and critical generators in the groups by analyzing low-frequency oscillations. Further developed, method is able to identify proximity to power system stability boundary. The technique developed is based on power system equivalent...
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