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This paper presents an analytical study and hardware-in-loop (HIL) cosimulation design of a grid-connected inverter system with a combinational robust observer-based modified repetitive current controller. In this study, main attention is paid to improve power quality and tracking performance of a distributed generation (DG) interfacing system under various perturbations. The inherent delay in convergence...
This paper presents an approach for current sensing in digital controlled buck converters. From the several possible techniques for current sensing an observer based algorithm in a digital implementation is used as it has the advantage of not needing an additional sensor or shunt in the circuit which causes additional power losses and costs. The system concept used herein works without additional...
This paper presents the application of fixed frequency (or indirect) Sliding Mode Control (SMC) to the DC-DC Single-Ended Primary Inductor Converter (SEPIC) where the switching frequency is in the range of hundreds of kHz and consequently a FPGA is required. Due to the constraint of FPGA, only the output voltage is measured. As the proposed SMC requires the knowledge of all the states, an extended...
The Field Programmable Gate Array (FPGA) components offer effective solutions and provide real-time computation performances for control algorithms of electrical systems. The aim of this paper is to present the FPGA implementation of an Automatic Tracking Observer (ATO) for the synchronization of the grid voltage vector. This application is particularly useful for the control of a three-phase Pulse...
This paper presents the application of fixed frequency (or indirect) Sliding Mode Control (SMC) to the DC-DC Single-Ended Primary Inductor Converter (SEPIC) which can operate in both step-up and step-down modes. Simulation and experimental studies are conducted. Two laboratory prototypes have been made: one with a switching frequency of 20kHz uses a DSP board which allows to validate the proposed...
A new control method based on State-Dependent Ricatti Equation(SDRE) control for DC-DC converter with FPGA based hardware controller is proposed. Deadbeat control is one effective digital control approach, and the robustness for the variation of the system parameter is the key issue. Some approaches were proposed, for exsample, a single-rate deadbeat control with disturbance observer, a multi-rate...
Induction motor speed sensorless torque control, which allows operation at low and zero speed, optimizing both torque response and efficiency, is proposed. The control is quite different than the conventional field-oriented or direct torque control. A new discontinuous stator current FPGA based controller and rotor flux observer based on sliding mode and Lyapunov theory are developed analyzed and...
A simple procedure is proposed in this paper for eliminating harmonics in the load voltage of stand-alone single-phase inverters, while supplying non-linear loads. An observer has been designed for estimating the fundamental component and hence the harmonics present in the load voltage. Assuming that the Inverter could be modeled as a feed back control system with the fundamental component as the...
A modified current control scheme in D-Q rotating frame for single-phase inverters is presented in this paper to provide zero steady state error at fundamental frequency as well as waveform fidelity. The new procedure uses tuned observers to transform the physical quantities like "current" to real and imaginary values in stationary frame. The rotation matrix is used to transform from stationary...
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