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This paper develops selective strategies for Neutral Point Clamped Multilevel Inverter (NPC) in a microgrid application with load current decomposition based on Synchronous Reference Frame (DQ) method. The 3-level NPC inverter is investigated as widely used topology for medium and high power applications. In addition to the current injection into the grid, the 3-level NPC DG inverter is also being...
This paper presents quantitative feedback theory (QFT) based control and tracking of ball and beam system. QFT is a frequency domain approach using Nichols chart. This technique achieves desired robust design over a specified range of plant uncertainty. QFT is used for the design of robust controllers for the plant with uncertainties in the parameters, input/output disturbances and noises. Ball and...
In the case of existence of disturbances in a classical single input single output feedback control system, the controller can take action after the disturbance makes the controlled variable move away from the desired value. On the other hand, a cascade control scheme will take an immediate corrective action by using an inner loop controller. In this paper, the use of controller synthesis to tune...
This paper proposes a new type of predictor to equip automatic PID controllers. The presented predictor is designed to ensure an adequate control for long time processes, whose evolution in time should be controlled in closed loop. At these processes, as a result of automatic control, the outputs followed run within limits for a period of time which, sometimes, exceeds the period in which the system...
This paper addresses the L1-optimization concept advanced in the modern control theory with an application to the design of the L1-optimal lateral autopilot system. The control objective is to maintain the desired roll orientation of an UAV in the presence of external unmeasurable disturbances, in particular, of a gust. To achieve a high performance index, the two separate control algorithms are proposed...
In this short paper, some fundamental study of basic control theory has been carried out using experimental kits developed under a joint venture of institute and industry interaction. The presented work mainly focuses on the study of stability issues and performance analysis of some class of control system problems, particularly, second- and third-order plants.
In this paper, two control algorithms for maintaining constant DC bus voltage under wide variations in generation and loading conditions in a DC micro-grid are discussed. They are: the traditional voltage based control and a modified voltage plus SoC (state-of-charge)-based control. The DC micro-grid consists of a photovoltaic (PV) system, a wind energy system based on permanent magnet synchronous...
This study aims to implement fuzzy logic controller using Mamdani and defuzzification method of Centroid, as a controller for train speed. Research methodology employed consists of Modeling, Design, Testing, and Analysis. At Modeling phase, the system is modeled utilizing transfer function model; at Design phase, the system with fuzzy logic controller is designed; at Testing phase, system output is...
The modular multilevel converter (MMC) is a highly efficient multilevel converter topology suitable for high and medium voltage applications. However, one of the negative traits of MMC is the existence of circulating current. The detrimental effects of circulating currents include distortion in arm voltages, converter power loss and high switching stresses on semiconductor devices. This paper aims...
The main power supply of Proton-Synchrotron (PS) accelerator is one of the biggest at CERN. The old rotating machine system has been replaced with a new NPC based DC/DC power supply named POPS (Power system for PS main magnets) with capacitor banks as energy storage mean. POPS is in operation since February 2011. The operation of the PS accelerator requires a specific design of the control system...
PI controllers are frequently implemented in cascaded converter system to control the DC-link voltage, because they can achieve zero steady state error. However the PI controller adds a pole at the origin point and a zero on the left half plane, and it increases the control system type number, and then the system is more difficult to control. This paper proposed a DC-link control method for the two...
This work proposes the usage of a repetitive-based control to dynamically restore the voltage applied to grid sensitive loads. The control is able to wipe off harmonic distortion and relies on simple transfer function. As a consequence, there is no need to apply harmonic selective filters. Moreover, the filter is able to work on sinusoid references and avoids employment of the dq transform. The design...
The increasing deployment of intermittent renewable energy sources (RESs) around the world has revealed concerns about the power grid stability. To solve this problem, a massive use of storage systems is needed. The main goal of this work is to develop a hybrid energy storage system (HESS) combining several storage devices with complementary performances. In this paper, lead-acid batteries and supercapacitors...
This paper deals with the identification of fractional models with one fractional parameter. This kind of models are capable to represent an extensive range of dynamics, including overdamped and oscillatory behaviors. The identification algorithm consists in applying an optimization function, starting from an initial point, that allows the program to calculate a very representative model of the process...
The purpose of this article is an analysis of periodic disturbance compensator parameters, which ensure a stability of compensation process. The stability of periodic disturbance compensation is given by dynamic feature of control system and spectral features of periodic disturbance. As a result of analysis is to set limits of stability fields at specific conditions of control system dynamic function...
The proportional capacitor-current feedback active damping method has been widely used to suppress the LCL-filter resonance. However, the time delay in the damping control loop may lead to non-minimum phase or even unstable responses when the resonance frequency varies in a wide range. To improve the robustness of damping, this paper proposes an improved damping controller with the capacitor current...
This paper deals with controls of a converter, where two paralleled-inverters are used. One inverter acts as a master unit and the other one acts as a slave unit. Thanks to these controls, an accurate tracking of the references is got and the output voltage ripples are lowered. As the goal is not to expand the system capacity, the slave unit delivers the currents to the load and becomes the power...
The paper presents an approach to design a robust PI controller for an active suspension system with uncertain parameters. To take care of parametric uncertainty in the system, the transfer function of controlled system is modified in the interval plants by using the kharitonov's theorem of stability. The stability region of the system is found by plotting the (kp, ki) - plane which is plotted using...
The main aim of this paper is to present analysis of anti-windup compensation impact on tracking performance for a second-order plant with time delay and continuous-time PID controller tuned by pole-placement. The paper uses a first-order non-Pade approximation of the delay in order to streamline the solution of the Diophantine equation. In the case of using Pade approximation, the solution could...
Control of active magnetic bearings is an important area of research. In this paper authors present the methodology of design, discretization and implementation PIλD controller for magnetic levitation system. Implementation on the laboratory system was performed to validate the presented methodology. The presented methodology is promising and can be successfully used in other control systems.
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