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This paper proposes a DC link controller based on H∞ method for robust and reliable operation of a single-phase grid-connected inverter with an LCL-filter in photovoltaic (PV) applications. The H∞ DC link controller minimizes the bus voltage fluctuations caused by the power variations of PV system. Also, the controller ensures system robustness against such power variations, which conventional controllers...
Using Bhuman walking engine, this paper presents an LTI model for Nao robot walking control. The robot is assumed as a point mass in a 2-D maneuver. Model calculations and validation have been done using experimental data, performing various tests on the robot, and using system identification tools. Afterwards, a robust controller is designed to control the robot position in the horizontal (x-y) plane...
This study extends the application of Unbiased Criterion (UC) method to investigate the robustness of an identified fuzzy model for nonlinear dynamical systems in their different operating conditions. Heat Recovery Steam Generator (HRSG) as specific boilers in combined power plants exhibit challenging behaviors in startup, shut down and parallel conditions such as Swell and Shrink. In order to analyze...
In this paper, a robust controller is designed based on μ-synthesis method for grid-connected inverters. The performance of the controller is made robust against realistic uncertainties including the time delay and parameter changes, while the resonant oscillations are actively damped. The designed controller only relies on output feedback eliminating the need for extra feedback sensors that are normally...
In this paper, a robust controller is designed to control the output voltage of an inverter with an LC type output filter in an islanded microgrid. The proposed controller includes a local droop controller, as well as a robust controller that is designed based on the μ-synthesis technique. The performance of the designed controller is proven to be robust to the uncertainties which include the time...
In this paper, a robust decentralized controller is designed for automatic voltage regulator (AVR) and load frequency control (LFC) systems of a generator in an islanded microgrid with multiple distributed generation systems. This control strategy can be readily applied to an islanded microgrid which consists of renewable distributed generation and energy storage systems. The control strategy proposed...
In this paper, a robust controller is designed for the load frequency control (LFC) system in an islanded microgrid with multiple synchronous generation systems. This control strategy can be readily applied to an islanded microgrid which consists of renewable distributed generation and energy storage systems. The robust controller proposed in this paper includes multiple local controllers that are...
In this paper, a real-time optimized Propotional-Integral-Derivative (PID) controller for a three Degree of Freedom (3DOF) helicopter is proposed. The real-time optimization of the PID controller gains is performed by the extremum seeking algorithm. The system is an under-actuated mechanical system with high nonlinearity and high coupling among its states. Such system is affected by the outside disturbances...
Iris recognition is gaining more attention and the development of the field is increasing rapidly. This paper presents a complete iris recognition system. The iris features are obtained using Speeded Up Robust Features (SURF) after enhancing the image using Contrast Limited Adaptive Histogram Equalization (CLAHE). A novel matching algorithm based on applying fusion rules at different levels is proposed...
Super resolution (SR) image reconstruction refers to a process of generating a high resolution image from several low resolution images. There is a high demand for highresolution satellite sensing in modern applications. SR offers an affordable solution for this high demand. The accuracy of super resolution depends on the accuracy of determining the difference between the low-resolution images. The...
This paper presents a robustness comparison between two motion control schemes for a 6DOF robot manipulator under uncertainty conditions. A conventional model-free PID controller and a model-based feedforward approach as two applicable control algorithms used in industrial robots are considered. We study the robustness performance of these algorithms when the dynamical model of Stäubli TX40 robot...
It's not easy to implement the mixed H2/H∞ optimal controller for high order system, since in the conventional mixed H2/H∞ optimal feedback the order of the controller is much than that of the plant. This difficulty had been solved by using the structured specified PID controller. The merit of PID controllers comes from its simple structure, and can meet the industry processes. Also it has some kind...
Three robust load frequency controllers are proposed in this paper. The first is based on H∞ control design in order to obtain robustness against uncertainties. The second controller is a reduced model to the H∞ controller because the first one is very complex for practical implementation. Genetic algorithm (GA) is used in the third controller to optimize proportional integral differential (PID) controller...
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