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LQR, when applied with a Kalman State Estimator, can implement a control method that only senses the output voltage, avoiding a current sensorDigital LQR Control with Kalman Estimator forDC-DC Buck Converter

DC-DC Buck Converter TopologyIn this work, a low sampling frequency Digital LQR with aDigital Kalman State Estimator with Buck Converter, working at2 MHz, is implemented in Matlab.

The circuit parameters values of the buck converter prototypeare: Input Voltage Vin = 2:5V ; Switching FrequencyFsw = 2MHz; Filter Capacitance C = 10F; Filter InductorL = 2:2H; Load Resistor R = 1; Capacitor Equivalent SeriesResistance (ESR) rC = 5m; Inductor ESR, rL = 20m.Advanced Non-Inverting Step up/down Converterwith LQR Control TechniqueThis topology is composed of a boost converter which is followed by a buck converter through a magnetic coupling.A control algorithm is developed based on LQR method to regulate the output voltage of the converter.PSCAD/EMTDC software is used to evaluate and verify mathematical model results and simulated circuit model.

Boost PartBuck PartProposed buck-boost converter topology

The Dynamic model showed that there is no any RHP zero in the transfer function of the proposed converter. Simulation results also matchclosely with the responses of mathematical model gained in MA TLAB.LQR CONTROL WITH INTEGRAL ACTION APPLIED TO A HIGH GAINSTEP-UP DC-DC CONVERTER(LQR) control technique applied to a high gain boost converter based on three-state switching cell (TSSC).with the aim to obtain the optimal control law that minimizes the predefinedcost function, the compensator design is performed using MATLAB. The converter control system is validated through simulation using ORCAD and experimentation by developing a 1-kW laboratory prototype.

TABLE IParameter values of the original boost converter.Parameters ValuesInput voltage Vbat=42 VBoost inductor L=70 HEquivalent series resistance Rse=0.1 Output capacitor Co=680 FLoad resistance Ro=160 Output voltage 400 VRated duty cycle D=0.7Switching frequency fs=25 kHzSwitching period Ts=40 sInput voltage range 42-56 VOutput power 1 kWThe development of LQR control for the outputvoltage including short circuit protection is suggested as afuture study.LQR Control of an Asymmetrical InterleavedDual Boost Converter Working in Inherent DCMLinear Quadratic Regulator (LQR)control design for a new fifth order DC/DC boost converterare presented.

Application of Sampled Data LQR Control Schemefor Grid Tie Inverter

a discrete-time closed loop optimaltracking technique by adjusting different weights combinationin discrete-time cost function.State estimation techniques can beincorporated in this system as future recommendation as morepractical approach.Speed Control of Buck-converter Driven Dc Motor Using LQR and PI: A Comparative Assessment

Overall layout of buck converter with motor.LQR and PI are the techniques proposed in this investigation to control the speedof a dc motor.Complete design and analyses of simulation results for LQR and PI technique arepresented in frequency domain and time domain.Result: In terms of speed of the angular velocity response, the LQR controller provides faster input tracking response as compared to PI, which is proven by the smaller value of rise and settling time. However, the LQR controller results in a high input energy of duty cycle ascompared to the PI controller.