A. J. Sguarezi Filho

A Deadbeat Active and Reactive Power Control for Doubly Fed Induction Generator

Abstract This article proposes a power control scheme for doubly fed induction generator for variable speed wind power generation. This scheme uses a deadbeat control loop. The algorithm of the deadbeat calculates at each sample period the voltage vector to be supplied to the rotor in order to guarantee that the active and reactive power reach their desired reference values. The robustness of the controller against rotor resistance variation was evaluated. Simulations results are carried out for validation of the digital controller operation.

A wind energy generator for smart grid applications using wireless-coded neuro-fuzzy power control

Wind energy is the major driver to obtain an optimized and efficient use of renewable energy in smart grids. To provide balanced supply, demand, and storage of energy in a much more efficient manner than is done today, smart grids require the employment of an advanced communication infrastructure associated to a robust power control and real-time monitoring systems.Towards this objective, we present a wireless-coded power control scheme for doubly fed induction generators operating at variable speed. The proposed system employs adaptive neuro-fuzzy control, quaternary phase shift-keying modulation, and low-density parity check coding techniques to improve the system robustness and reliability in different propagation conditions for remotely transmitting the power control references from the control center to a given aerogenerator.

A digital active and reactive power control for doubly-fed induction generator

A power control scheme for doubly-fed induction generator for variable speed wind power generation is proposed. Using digital controller and by using stator field oriented, the algorithm calculates the voltage vector to be supplied to the rotor in order to eliminate the active and reactive power errors. Simulations results are presented for validation of the digital controller operation.

A deadbeat direct power control applied to doubly-fed induction aerogenerator under normal and sag voltages conditions

In wind energy systems, doubly-fed induction generator is commonly used. The grid requirements for DFIG operation in an occurrence of low voltage ride-through can damage or destroy the converter or damage the generator and its operation can can help the robustness of the power systems by the injection of reactive power. Thus, this paper proposed a deadbeat direct power control for doubly-fed induction generator during low voltage ride-through (LVRT). The controller was designed using the generator model and it allows active and reactive power control also during a voltage sag. The state variables are the active and reactive power, and the inputs are the rotor voltage vector. The controller has a simple implementation and fast dynamic response. Experimental results are obtained to verify the deadbeat direct power controller operation.

A wireless deadbeat power control for wind power generation systems in smart grid applications

This paper proposes a wireless deadbeat power control scheme employing low density parity check coding for variable speed wind power generation (the wind industry is the huge driver behind the push for super-grids and cross-border infrastructure) to improve system robustness and reliability. The wind energy systems uses a doubly-fed induction generator and a deadbeat control. The performance improvements of the proposed system are investigated in different propagation conditions by using simulations results.

Digital controller design for interleaved boost converter in photovoltaic system

In this paper is presented the design of a discrete control system with double loop for a photovoltaic system using interleaved two levels boost converter. For design of discrete compensators used in this work the delay time of the digital systems is considered in order to improve response of controllers. An easy method to design the compensators it is presented using the continuous time analysis and the addition of the delay time. Finally, the discrete compensator is validated through the simulation results performed by using the PSIM software.

Implementation of a neuro-fuzzy direct torque and reactive power control for DFIM

This paper proposes a Takagi-Sugeno neurofuzzy inference system for direct torque and stator reactive power control applied to a doubly fed induction motor (DFIM). The control variables (d-axis and q-axis rotor voltages) are determined through a control system composed by a neuro-fuzzy inference system and a first order Takagi-Sugeno fuzzy logic controller. Experimental results are presented to validate the controller operation for variable speed under no-load and load conditions and stator reactive power variation under load condition. For this last validation, a PI controller is used to control the rotor speed, thereby its output is used to manipulate the torque in order to follow the demanded speed value.

A wind energy generator for smart grid applications using wireless coding neuro-fuzzy power control

The wind energy generation is the huge driver behind the push for supergrids and cross-border infrastructure for renewable energy systems into smart grids. To provide balance supply, demand, and storage of energy over a region in a much more efficient manner than it is done today, smart grids will need to use an advanced communication infrastructure into a robust control system. Towards this objective, it is proposed in this paper a wireless coding power control employing low density parity check coding to improve system robustness and reliability. For variable speed operation, the wind energy system uses a doubly-fed induction generator and a neuro-fuzzy controller. The performance improvements of the proposed system are investigated in different propagation conditions.

Speed vector control strategy with torque ripple reduction for 12/8 switched reluctance motor

In this paper, a new strategy of speed vector control is proposed for reducing the torque ripple of a Switched Reluctance Motor (SRM). The SRM is characterized by its simple manufacturing, robustness, reliability and high-speed operation. However, the SRM also presents high torque ripple and acoustic noise. The proposed vector control strategy is implemented in the stationary reference frame and it is performed with three PI controllers. Furthermore, the reference voltage vector is synthesized using a space vector modulation technique for an asymmetric half-bridge converter. The proposed system was validated through simulations performed in SimPowerSystems of Matlab/Simulink. It was compared the simulation results of the proposed strategy with a traditional speed control method verifying its good performance.

Controle deadbeat codificado sem fio de potências para aerogeradores de indução duplamente alimentados visando aplicações em redes inteligentes

As redes inteligentes utilizam uma avancada infraestrutura de telecomunicacoes para promover o gerenciamento de toda a geracao, transmissao e armazenagem de energia sobre uma regiao de maneira muito mais eficiente do que e feito hoje em dia. Entretanto, nas redes inteligentes, a utilizacao de tecnologias de comunicacao sem fio para a transmissao de sinais de monitoramento e controle requerem uma eficiente protecao contra erros na transmissao dos dados, evitando assim serios problemas a planta energetica. Com esse foco, o trabalho trata do projeto de um sistema de controle deadbeat codificado sem fio de potencias para um gerador de inducao duplamente alimentado voltado a geracao eolica para aplicacoes em redes inteligentes.