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- 검색키워드
- 저자 : Linares-Flores (검색결과 4 건)
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Linares-Flores, Jesus,Sira-Ramirez, Hebertt,Cuevas-Lopez, Edel F.,Contreras-Ordaz, Marco A. The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
This article deals with the sensor-less control of a DC Motor via a SEPIC Converter-Full Bridge combination powered through solar panels. We simultaneously regulate, both, the output voltage of the SEPIC-converter to a value larger than the solar panel output voltage, and the shaft angular velocity, in any of the turning senses, so that it tracks a pre-specified constant reference. The main result of our proposed control scheme is an efficient linear controller obtained via Lyapunov. This controller is based on measurements of the converter currents and voltages, and the DC motor armature current. The control law is derived using an exact stabilization error dynamics model, from which a static linear passive feedback control law is derived. All values of the constant references are parameterized in terms of the equilibrium point of the multivariable system: the SEPIC converter desired output voltage, the solar panel output voltage at its Maximun Power Point (MPP), and the DC motor desired constant angular velocity. The switched control realization of the designed average continuous feedback control law is accomplished by means of a, discrete-valued, Pulse Width Modulation (PWM). Experimental results are presented demonstrating the viability of our proposal.
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Jesus Linares-Flores,Hebertt Sira-Ramirez,Edel F. Cuevas-Lopez,Marco A. Contreras-Ordaz 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
This article deals with the sensor-less control of a DC Motor via a SEPIC Converter-Full Bridge combination powered through solar panels. We simultaneously regulate, both, the output voltage of the SEPIC-converter to a value larger than the solar panel output voltage, and the shaft angular velocity, in any of the turning senses, so that it tracks a pre-specified constant reference. The main result of our proposed control scheme is an efficient linear controller obtained via Lyapunov. This controller is based on measurements of the converter currents and voltages, and the DC motor armature current. The control law is derived using an exact stabilization error dynamics model, from which a static linear passive feedback control law is derived. All values of the constant references are parameterized in terms of the equilibrium point of the multivariable system: the SEPIC converter desired output voltage, the solar panel output voltage at its Maximun Power Point (MPP), and the DC motor desired constant angular velocity. The switched control realization of the designed average continuous feedback control law is accomplished by means of a, discrete-valued, Pulse Width Modulation (PWM). Experimental results are presented demonstrating the viability of our proposal.
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Rubén Heredia‑Barba,José Antonio Juárez‑Abad,Jesús Linares‑Flores,Marco Antonio Contreras‑Ordaz,Jorge Luis Barahona‑Ávalos 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.4
This study presents a passivity-based controller for a single-phase active rectifier–DC motor (SPAR-DCM) system. The mainobjective in the mechanical stage (DCM) is to regulate and maintain the desired angular speed of the motor under sudden load torque changes. Moreover, in the electric power stage, namely single-phase active rectifier (SPAR), the power factor (PF) should stay close to unity. We designed an Online Algebraic Estimator (OAE) to estimate the load torque parameter, adapted to the linear controller based on the exact static error dynamic passive output feedback (ESEDPOF) to minimize its effects. To synchronize the SPAR-DCM system with the grid, we used a second-order general integrator phase-locked loop to generate the necessary reference signals for the ESEDPOF controller. The arithmetic processing is programmed at mediumscale field-programmable gate array Spartan-6 XC6SLX16 through a detailed architecture design in 32 bits and in floating point, according to the standard IEEE-754. Experimental results verified the correctness and effectiveness of the proposed control algorithm. Furthermore, we demonstrated that the PF value is close to unity through power quality measurements.
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Influence of hydrodynamic parameters in plate heat exchangers in ice slurry transport
Jiménez Pacheco Hugo Guillermo,Milon Guzmán Juan José,Miranda Ramos Lilia Mary,Delgado Sarmiento Pavel Kewin,Linares Flores Castro Antonio Erick,Leal Braga Sergio 대한설비공학회 2023 International Journal of Air-Conditioning and Refr Vol.31 No.1
Ice slurry is applied in different refrigeration and air conditioning systems, and among its main advantages is the ability to store latent heat and be pumpable as cold water. This fluid can be used for thermal storage instead of cold water or solid ice, since, at certain concentrations, it can be pumped through heat exchangers. For this technology to be widely used, the equipment must be designed considering the heat exchange characteristics. This study developed an experimental system to study the parameters that influence heat exchange, using ice slurry in a plate heat exchanger and water as a thermal load. Several situations with different flows and initial fractions of ice in ice slurry were analyzed. The input conditions of the thermal load were kept constant, the temperature, the pressure drop and the flow of the ice slurry in the heat exchanger were controlled, according to the Nusselt, Prandtl, and Reynolds coefficients. Results show that the global heat exchange coefficient increases with the increase of the initial ice fraction; the cooling capacity of the heat exchanger increases when ice slurry is used as a fluid. For flow rates greater than 0.16 kg/s and ice fractions above 11%, ice crystals are generated at the heat exchanger outlet, due to the ice slurry’s higher viscosity, at approximately 0.003 Pa at the outlet, since the pressure drop increases as the initial ice fraction increases. Results show ice slurry thermohydraulic behavior. Its use shows favorable characteristics in heat exchange. Ice slurry is applied in different refrigeration and air conditioning systems, and among its main advantages is the ability to store latent heat and be pumpable as cold water. This fluid can be used for thermal storage instead of cold water or solid ice, since, at certain concentrations, it can be pumped through heat exchangers. For this technology to be widely used, the equipment must be designed considering the heat exchange characteristics. This study developed an experimental system to study the parameters that influence heat exchange, using ice slurry in a plate heat exchanger and water as a thermal load. Several situations with different flows and initial fractions of ice in ice slurry were analyzed. The input conditions of the thermal load were kept constant, the temperature, the pressure drop and the flow of the ice slurry in the heat exchanger were controlled, according to the Nusselt , Prandtl , and Reynolds coefficients. Results show that the global heat exchange coefficient increases with the increase of the initial ice fraction; the cooling capacity of the heat exchanger increases when ice slurry is used as a fluid. For flow rates greater than 0.16 kg/s and ice fractions above 11%, ice crystals are generated at the heat exchanger outlet, due to the ice slurry’s higher viscosity, at approximately 0.003 Pa at the outlet, since the pressure drop increases as the initial ice fraction increases. Results show ice slurry thermohydraulic behavior. Its use shows favorable characteristics in heat exchange.
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