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Power Electronics Converters Applications And Design

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Integration Of Alternative Sources Of Energy

Grid integrated renewable DG systems: A review of power quality challenges and state-of-the-art mitigation techniques

Arsenic groundwater contamination and its health effects in Patna district (capital of Bihar) in the middle Ganga plain, India.

A simple and efficient solar photovoltaic (PV) water pumping system utilizing an induction motor drive (IMD) is presented in this paper. This solar PV water pumping system comprises two stages of power conversion. The first stage extracts the maximum power from a solar PV array by controlling the duty ratio of a dc–dc boost converter. The dc bus voltage is maintained by the controlling the motor speed. This regulation helps in the reduction of motor losses by reducing motor currents at higher voltage for the same power injection. To control the duty ratio, an incremental conductance based maximum power point tracking (MPPT) control technique is utilized. A scalar-controlled voltage source inverter serves the purpose of operating an IMD. The stator frequency reference of IMD is generated by the proposed control scheme. The proposed system is modeled, and its performance is simulated in detail. The scalar control eliminates the requirement of a speed sensor/encoder. Consequently, the need of motor current sensor is also eliminated. Moreover, the dynamics are improved by an additional speed feedforward term in the control scheme. The proposed control scheme makes the system inherently immune to the variation in the pump constant. The prototype of PV-powered IMD emulating the pump characteristics is developed in the laboratory to examine the performance under different operating conditions.

Standalone Photovoltaic Water Pumping System Using Induction Motor Drive With Reduced Sensors

This paper deals with two-stage solar photovoltaic (PV) system with a damped-second-order generalized integrator (SOGI) algorithm. Proposed topology not only integrates the PV energy to the grid, in addition, it provides the load compensation, power factor correction, and harmonics elimination. Therefore, a double stage system is proposed where the first stage is a dc–dc boost converter, which performs the maximum power point tracking by regulating its duty ratio. For extracting maximum power from the PV array, an incremental conductance-based approach is utilized. Moreover, in the next stage, a voltage source converter (VSC) is utilized. To control the VSC, a damped-SOGI algorithm is used. By using a damped-SOGI-based control algorithm, fundamental active components of load currents are extracted for evaluating the reference grid currents. After comparing reference grid currents with sensed grid currents, switching pulses for the grid tied VSC are produced. A prototype of the proposed system is developed in the laboratory and test results are presented for verification of control of solar photovoltaic system.

Damped-SOGI-Based Control Algorithm for Solar PV Power Generating System

Foreword.- Preface.- List of Symbols and Abbreviations.- Introduction to Fracture Mechanics of Concrete.- Fracture Mechanics of Concrete - State-of-the-Art Review.- Fracture Behavior of Concrete using Cohesive Crack and Size Effect Models.- Crack Propagation Study using Double-K and Double-G Fracture Parameters.- Fracture Properties of Concrete based on the KRcurve Associated with Cohesive Stress Distribution.- Comparison of Fracture Parameters of Concrete using Nonlinear Fracture Models.- Appendix. Subject index.

Concrete Fracture Models and Applications

This paper presents a multipurpose photovoltaic (PV) system using a lattice wave digital filter (LWDF)-based control approach. The multipurpose PV system is developed for integrating the active power to the distribution system with variable PV insolation and compensating the nonlinear loads connected at point-of-common coupling. The PV system is multifunctional; therefore, it serves various purposes. It injects the active power of solar PV array to the grid. It mitigates harmonics of loads and provides grid currents balancing. The PV system incorporates a PV array, a boost converter, a voltage-source converter (VSC), a nonlinear load, and a distribution system. The boost converter is utilized for maximum power extraction from PV array using an incremental-conductance-based maximum power point tracking technique. To control the grid-tied VSC, a LWDF-based control approach is proposed. In addition, this approach is able to produce the desired sinusoidal fundamental component of load current to estimate the grid reference currents. The aim is to implement this control as it has many properties like low-pass band sensitivity, good dynamic response, and reduction in a dc-offset noise error. The varieties of experimental results are presented to validate the control of a PV system.

A Multipurpose PV System Integrated to a Three-Phase Distribution System Using an LWDF-Based Approach

This study proposes a solar photovoltaic (SPV) water pumping system integrated with the single phase distribution system by utilising induction motor drive (IMD) with an intelligent power sharing concept. In addition to the power exchange from SPV to the IMD, a DC-DC boost converter is utilised as a power factor correction unit and a grid interfacing device. For good utilisation of SPV array, it is necessary to extract maximum power from the SPV array. To meet this objective, an incremental conductance based maximum power point tracking control is implemented. Whereas, to control the IMD tied to voltage source inverter, a simple voltage/frequency control technique is used. The proposed topology is designed and tested in the laboratory under standalone, grid interfaced and in mixed mode under various operating conditions.

https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-rpg.2016.0597

Shailendra Kumar

Papers

Standalone Photovoltaic Water Pumping System Using Induction Motor Drive With Reduced Sensors

Damped-SOGI-Based Control Algorithm for Solar PV Power Generating System

Concrete Fracture Models and Applications

A Multipurpose PV System Integrated to a Three-Phase Distribution System Using an LWDF-Based Approach

Intelligent grid interfaced solar water pumping system