R. R. Joshi

Optimal Control of Matrix-Converter-Based WECS for Performance Enhancement and Efficiency Optimization

This paper describes a new wind energy conversion scheme, where fuzzy logic principles and four-leg-improved novel matrix converter (MC) model are used for performance enhancement and efficiency optimization, particularly for sites where most of the time low wind speeds prevail. The MC is intended as the interface medium between the induction generator and the utility grid. The power factor at the interface with the grid is controlled by the MC to ensure purely active power injection into the grid for optimal utilization of the installed wind turbine capacity. The generation system has fuzzy logic control with vector control in the inner loops. Fuzzy controller tracks the angular frequency with the wind velocity to extract the maximum power and programs the machine flux for light load efficiency improvement. The complete control system has been developed, analyzed, and validated by simulation study.

Development of a novel control for a matrix converter interfaced wind energy conversion system for dynamic performance enhancement

Abstract This article presents the development of a novel control for matrix converter interfaced permanent magnet wind energy conversion system. Here, an adaptive fuzzy control algorithm incorporated with a reversed matrix converter is proposed to yield maximum energy with enhanced dynamic performance and low harmonic characteristics. The control algorithm is implemented using a dSPACE DS1104 real-time board (dSPACE, Paderborn, Germany). Feasibility of the proposed system has been verified through simulation and experiment results using a laboratory 1.2-kW prototype of a wind energy conversion system under dynamic conditions.

DSP-Based Matrix Converter Operation Under Various Abnormal Conditions with Practicality

The matrix converter connects the three phase power supply with the three phase load directly through a switching matrix composed of four-quadrant switches. The operation of matrix converter with unbalanced power supply has been analyzed. For this, a 230 V, 250 VA three phase to three phase matrix converter prototype is implemented using DSP based controller and tests have been carried out to evaluate and improve the stability of system under typical abnormal conditions. Digital storage oscilloscope & power quality analyzer are used for experimental observations.

Modern power electronic technology for the integration of renewable energy sources

In this chapter, new trends in power-electronic technology for the integration of renewable energy sources like wind/photovoltaic and energy-storage systems are presented along with the current technology and future trends in variable-speed wind turbines. Also, the research trends in energy-storage systems used for the grid integration of intermittent renewable energy sources are discussed in detail.

A robust control algorithm based high voltage direct current system connected to a weak ac grid

During various faults in a high voltage direct current (HVDC) system, the voltage gets reduced, which in turn results into commutation failure, which can deteriorate the availability of HVDC links and thus affect the performance of the power system. In this paper, efforts are made to ride through these faults and so to lower the effect of commutation failure on the power system, and the remedy is implemented by using a robust control algorithm which utilizes a new space vector modulation-based strategy. The validity and effectiveness of the control algorithm are verified by PSCAD/EMTDC-based simulation which shows that with the proposed control, the system can operate steadily, has the capability to restore steady state condition when short-circuit fault occurs, and is feasible technically and obvious in advantages.

Voltage sag assessment with respect to sensitivity of adjustable speed drives in distributed generation environment

Voltage sag is one of the common and sensitive issues for customers and power system utilities. When voltage sag occurs at supply end will cause shutdown of the entire industrial operation process, it incurs financial and technical losses to the industries. Among various industrial processes, adjustable speed drives are more commonly used. According to data obtained from experimental tests performed on ASD, it is observed that voltage sag having magnitude below 0.7 p.u and duration 80ms leads to tripping of ASD. Further, new clean energy reforms motivating many countries towards power generation using renewable energy resources. This paper aims to investigate the effect on frequency of tripping of adjustable speed drive due to inclusion of distributed generation in power system network.

Control of the matrix converter based WECS for fault ride-through enhancement

Due to steadily increased in wind power penetration, regulatory standards for grid interconnection have evolved to require that wind generation systems ride-through disturbances such as faults and support the grid during such events. Keeping the converter online during and after short-circuit faults, and guaranteeing the actual standards of the converter connected to the grid, is becoming a very critical issue. From these goals, in this paper, an optimal control of matrix converter (MC) based wind turbine have been developed, where adaptive fuzzy logic controls along with improved SVPWM switching have been used extensively to ensure that current levels remain within design limits, even at greatly reduced voltage levels, thus enhancing the fault ride-through capability.

Optimal control of matrix converter based WECS for performance and stability enhancement at low wind speeds

In this paper, optimal control of new wind energy conversion scheme where four-leg improved matrix converter (MC) is used for performance and stability enhancement, particularly for sites where most of the time low wind speeds prevails, has been explained. The power factor at the interface with the grid is controlled by the MC to ensure purely active power injection into the grid for optimal utilisation of the installed wind turbine capacity. The generation system has fuzzy logic control with vector control in the inner loops. Fuzzy controller tracks the angular frequency with the wind velocity to extract the maximum power and programs the machine flux for performance, stability and efficiency enhancement during light load and low speeds. The complete control system has been developed and analysed using MATLAB/Simulink.