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This paper is concerned with control for a sampled-data system. A saturated quantizer-based controller is introduced. The corresponding closed loop system is transformed into a system with input saturation and bounded external disturbance. A new Lyapunov functional is constructed to derive a sample-interval dependent condition on the existence of a state feedback controller such that the closed-loop...
Distributed algorithms for economically managing the energy in smart grids are getting more attention because they can remove the need for central controllers and are computationally scalable, as well as robust to single point of failure. The Incremental Cost Consensus (ICC) algorithm has been developed as a cooperative distributed algorithm for solving the Economic Dispatch Problem (EDP). This paper...
This paper discusses the robust stabilization of a linear time-invariant system based on event triggering strategy. In most practical system, it is not possible to update control in continuous manner, so it is given to plant at some periodic discrete instants only. Recently, the event based control technique for control law update has become popular as it uses the resources efficiently while guaranteeing...
Single-phase inverters have gained important acceptance last time. This is because single phase inverters have been used in renewable energy, ac drives and many other applications and controlled by name ways as linear, nonlinear predictive between others. This paper studied the control of a Single-Phase Current Source Inverter (SP-CSI) for multi-cell and three-phase applications. Cascaded H-Bridge...
This paper proposes a current controller for grid tied Voltage Source Inverter (VSI) via a LCL filter using discrete-time Sliding Mode Control (SMC) in a multi-loop framework. The inner loop is implemented by the SMC with reference generated by an outer controller for the VSI side current. The tracking of the current entering the distribution network is ensured by a outer controller with a derivative...
In this paper, effect of power electronics interfaced sources on small signal stability in the presence conventional sources (synchronous generators) in a microgrid is studied. A detailed mathematical model for small signal analysis is presented. The models are linearised around operating point and state space matrix is used to find the eigenvalues at that point. Eigen value analysis is done to study...
Finite control set model predictive control (FS-MPC) has been shown to be a very effective approach to control of PMSM drives. FS-MPC is a very flexible tool since it can evaluate an arbitrary loss function. However, design of the appropriate loss function for the problem can be a challenge especially when the design input is visible only on the long horizon. An example where this problem becomes...
This document analyses the large-signal stability for an inverter-based generator such as photovoltaic and wind power sources. The objective of this study is to determine the stability region taking into account the electrical and control signal of the generator. The generator uses the concept of the electrostatic machine for the model of the generator. Finally, the applied procedure to find the Lyapunov's...
This paper proposed a generalized modeling methodology based on the PWM Switch Model for steady-state analysis and dynamic performance investigation of the single phase inverter. The motivation, algorithm and modeling methodology are presented. The developed models are verified against the switching models of both a half bridge dual buck inverter and a half bridge inverter in time domain to demonstrate...
This paper studies the operation of a microgrid under various scenarios with a focus on the effect of communication delays. The test microgrid is the CIGRE-IEEE low-voltage system, and a variety of loads are modeled in the system, including a nonlinear load, an impulse load, a battery, a highly capacitive load, and a highly inductive load. The simulation studies cover three scenarios: 1) a system...
A unique formation of model reference adaptive reference (MRAS) using, active power (P), reactive power (Q) and fictitious quantities (X and Y) as the functional candidates is presented. The formulation of MRAS in the proposed form has the advantage that, no machine parameters are involved, except the rotor resistance. The reference and adjustable model of modified MRAS are computed in rotating reference...
This paper addresses the robust H∞ filtering problem for a class of Markov jump Lur'e systems with time-varying transition probabilities in discrete-time domain. The time-varying character of transition probabilities is considered to be finite piecewise homogeneous. A full-order filter is designed such that the resulting closed-loop systems are stochastically stable and have a guaranteed H∞ performance...
Rapidly increasing penetration of renewable energy sources into conventional power distribution systems has led to the rise in power electronic converter dominated power distribution systems. However, it has been a well established that the presence of tightly regulated point-of-load (POL) converters in the power distribution system, which act as Constant Power Loads (CPLs), cause serious stability...
This paper describes a design procedure of a stabilizing controller for a system with time-varying delay based on the quadratic complete Lyapunov-Krasovskii functional. The proposed method leads the stabilizing problem to a convex problem and gives a stabilizing condition in the linear matrix inequality form. It also includes a H∞ controller design with a performance weight which shapes the sensitivity...
A new method for adaptive ac filter parameters identification of three phase pulse-width modulated rectifiers is presented in this paper. The proposed method is based on three adaptive linear neurons to identify online the ac filter resistances and inductances. The main advantage of this method is its simplicity and it requires low computational cost. The identification algorithm is implemented and...
In this paper, a distributed multiagent based algorithm is proposed to achieve SoC balance for DES in the DC microgrid by means of voltage scheduling. Reference voltage given is adjusted instead of droop gain. Dynamic average consensus algorithm is explored in each agent to get the required information for scheduling voltage autonomously. State-space analysis on a single energy storage unit and simulation...
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