Estructuras eléctricas para la integración de un sistema de generación eólica a la red eléctrica

Wind power generation has become one of the most important energy sources. Currently, due to the advances achieved in power electronics and vertical-axis small wind-turbines, the urban integration of wind-energy has increased considerably. In this work, three three-phase rectifiers are proposed to inject the energy from a permanent magnet synchronous generator to a microgrid DC-bus. By means of sliding mode control these architectures are modeled as a three-phase Loss Free Resistor allowing the power factor correction in each phase and obtaining a modular and redundant implementation. However, due to the cost of the microgrids implementation, a boost inverter is proposed to obtain the most basic configuration for grid-connection. Using the boost inverter a sinusoidal output waveform can be obtained for input voltages lower than mains voltage. Finally, the DC voltage and the DC-link capacitor can be adjusted in order to optimize the global efficiency.Wind power generation has become one of the most important energy sources. Currently, due to the advances achieved in power electronics and vertical-axis small wind-turbines, the urban integration of wind-energy has increased considerably. In this work, three three-phase rectifiers are proposed to inject the energy from a permanent magnet synchronous generator to a microgrid DC-bus. By means of sliding mode control these architectures are modeled as a three-phase Loss Free Resistor allowing the power factor correction in each phase and obtaining a modular and redundant implementation. However, due to the cost of the microgrids implementation, a boost inverter is proposed to obtain the most basic configuration for grid-connection. Using the boost inverter a sinusoidal output waveform can be obtained for input voltages lower than mains voltage. Finally, the DC voltage and the DC-link capacitor can be adjusted in order to optimize the global efficiency

A Composite DC–DC Converter Based on the Versatile Buck–Boost Topology for Electric Vehicle Applications

The composite converter allows integrating the high-efficiency converter modules to achieve superior efficiency performance, becoming a prominent solution for electric transport power conversion. In this work, the versatile buck–boost dc–dc converter is proposed to be integrated into an electric vehicle composite architecture that requires a wide voltage range in the dc link to improve the electric motor efficiency. The inductor core of this versatile buck–boost converter has been redesigned for high voltage applications. The versatile buck–boost converter module of the composite architecture is in charge of the control stage. It provides a dc bus voltage regulation at a wide voltage operation range, which requires step-up (boost) and step-down (buck) operating modes. The PLECS thermal simulation of the composite architecture shows a superior power conversion efficiency of the proposed topology over the well-known classical noninverting buck–boost converter under the same operating conditions. The obtained results have been validated via experimental efficiency measures and experimental transient responses of the versatile buck–boost converter. Finally, a hardware-in-the-loop (HIL) real-time simulation system of a 4.4 kW powertrain is presented using a PLECS RT Box 1 device. The HIL simulation results verified the accuracy of the theoretical analysis and the effectiveness of the proposed architecture

Análisis de estabilidad en tiempo discreto de un PFC controlado por corriente programada

This paper is an analytic study of a current-programmed DC/DC Boost converter, operating as power factor correction (PFC). The converter is modeled in discrete time and the stability analysis is performed by evaluating the Jacobian matrix at the point of equilibrium. Thus, the characteristic polynomial is obtained and by simulation is obtained the gain which makes the system be stable.Este artigo apresenta um estudo analítico de um convertedor Boot controlado por corrente programada funcionando como corretor de fator de potência (PFC), modela-se em tempo discreto, faz-se um análise de estabilidade baseado na matriz Jacobiana avaliada no ponto de equilíbrio, com ajuda do qual encontramos o polinômio caraterístico do sistema e por meio de simulações numéricas seguramos que as ganâncias de controle estejam dentro do círculo unitário para que o sistema seja estável.El presente artículo hace un estudio analítico de un convertidor Boost controlado por corriente programada funcionando como corrector de factor de potencia (PFC), se modela en tiempo discreto, se hace un análisis de estabilidad basado en la matriz Jacobiana evaluada en el punto de equilibrio, con ayuda de la cual encontramos el polinomio característico del sistema y, por medio de simulaciones numéricas, aseguramos que las ganancias de control estén dentro del circulo unitario para que el sistema sea estable

Sampling error‐based model‐free predictive current control of open‐end winding induction motor with simplified vector selection

Abstract A sampling error‐based finite‐set predictive current control (FS‐PCC) is proposed in this article for the open‐end winding induction motor (OEWIM) drive. The proposed scheme controls the zero‐sequence current (ZSC) alongside the stator currents. In a model‐free approach, this method predicts the future of ZSC and stator current components by the stator current and voltage sampling errors. In this way, the parameters of the OEWIM are not utilised in the prediction algorithm of the FS‐PCC. So, the proposed method is robust against the variation of the parameter. Moreover, this article presents a simple vector selection technique for the FS‐PCC of the OEWIM. The proposed technique has two cost functions and a simple algebraic equation to put the voltage vectors (VVs) in the prediction algorithm. The first cost function uses VVs that do not have the zero‐sequence voltage component. Then, the algebraic equation determines VVs that must be utilised in the second cost function. Finally, the optimum VV is selected by the second cost function. In the proposed scheme, the prediction algorithm is iterated 14 times instead of 27 iterations of the conventional predictive algorithm. So, besides establishing a novel model‐free prediction algorithm, the proposed method has almost 50% fewer calculations. The validity of the proposed sampling error‐based FS‐PCC and the simplified vector selection technique has been verified through experimental tests

Current Control of the Coupled-Inductor Buck–Boost DC–DC Switching Converter Using a Model Predictive Control Approach

International audienceCoupled-inductor buck-boost dc-dc switching converter has emerged as an alternative to manage power in several hybrid system architectures. This is due to features such as a noninverting voltage step-up and step-down characteristic, high efficiency, wide bandwidth, and the possibility to regulate its input or output currents as has been reported in previous works. All of them are based on a small-signal linearized model around an operating point. In this article, a model predictive control strategy is proposed to increase the operation point domain. The proposal consists in the use of the mathematical model of the system in discrete time to obtain the optimal switching state to be applied in the converter based on a cost function optimization, which simultaneously improves the current tracking and reduces the converter power losses. Experimental results validate the proposal demonstrating that this is a good alternative for the control of this kind of power converters

Análisis de Estabilidad en Tiempo Discreto de un PFC Controlado por Corriente Programada (Stability Analysis in Discrete Time of a PFC Controlled by Current -Programed)

El presente artículo hace un estudio analítico de un convertidor Boost controlado por corriente programada funcionando como corrector de factor de potencia (PFC), se modela en tiempo discreto, se hace un análisis de estabilidad basado en la matriz Jacobiana evaluada en el punto de equilibrio, con ayuda de la cual encontramos el polinomio característico del sistema y, por medio de simulaciones numéricas, aseguramos que las ganancias de control estén dentro del circulo unitario para que el sistema sea estable.Abstract: This paper is an analytic study of a current-programmed DC/DC Boost converter, operating as power factor correction (PFC). The converter is modeled in discrete time and the stability analysis is performed by evaluating the Jacobian matrix at the point of equilibrium. Thus, the characteristic polynomial is obtained and by simulation is obtained the gain which makes the system be stable.Sumário: Este artigo apresenta um estudo analítico de um convertedor Boot controlado por corrente programada funcionando como corretor de fator de potência (PFC), modela-se em tempo discreto, faz-se um análise de estabilidade baseado na matriz Jacobiana avaliada no ponto de equilíbrio, com ajuda do qual encontramos o polinômio caraterístico do sistema e por meio de simulações numéricas seguramos que as ganâncias de controle estejam dentro do círculo unitário para que o sistema seja estável.El presente artículo hace un estudio analítico de un convertidor Boost controlado por corriente programada funcionando como corrector de factor de potencia (PFC), se modela en tiempo discreto, se hace un análisis de estabilidad basado en la matriz Jacobiana evaluada en el punto de equilibrio, con ayuda de la cual encontramos el polinomio característico del sistema y, por medio de simulaciones numéricas, aseguramos que las ganancias de control estén dentro del circulo unitario para que el sistema sea estable.Abstract: This paper is an analytic study of a current-programmed DC/DC Boost converter, operating as power factor correction (PFC). The converter is modeled in discrete time and the stability analysis is performed by evaluating the Jacobian matrix at the point of equilibrium. Thus, the characteristic polynomial is obtained and by simulation is obtained the gain which makes the system be stable.Sumário: Este artigo apresenta um estudo analítico de um convertedor Boot controlado por corrente programada funcionando como corretor de fator de potência (PFC), modela-se em tempo discreto, faz-se um análise de estabilidade baseado na matriz Jacobiana avaliada no ponto de equilíbrio, com ajuda do qual encontramos o polinômio caraterístico do sistema e por meio de simulações numéricas seguramos que as ganâncias de controle estejam dentro do círculo unitário para que o sistema seja estável

Discrete Optimization of Weighting Factor in Model Predictive Control of Induction Motor

Tuning the weighting factor is crucial to model predictive torque and flux control. A finite set of discrete weighting factors is utilized in this research to determine the optimum solution. The Pareto line optimization technique is implemented to prevent the occurrence of local optimum solutions. By conducting an accuracy analysis, the number of discrete weighting factors is optimized, and the number of iterations is reduced. The stator current distortion minimization criterion is used to obtain the ultimate global optimal solution from the Pareto line. This study compares the results of the proposed optimization method and the particle swarm optimization method based on experimental data from a 4 kW induction motor drive test bench. The proposed technique can achieve the global optimum weighting factor in a shorter computational duration while maintaining a slightly lower total harmonics distortion and torque ripple