Abstract

In this work, a non-isolated DC–DC converter is presented that combines a voltage doubler circuit and switch inductor cell with the single ended primary inductor converter to achieve a high voltage gain at a low duty cycle and with reduced component count. The converter utilizes a single switch that makes its control very simple. The voltage stress across the semiconductor components is less than the output voltage, which makes it possible to use the diodes with reduced voltage rating and a switch with low turn-on resistance. In particular, performance principle of the proposed converter along with the steady state analysis such as voltage gain, voltage stress on semiconductor components, and design of inductors and capacitors, etc., are carried out and discussed in detail. Moreover, to regulate a constant voltage at a DC-link capacitor, back propagation algorithm-based adaptive control schemes are designed. These adaptive schemes enhance the system performance by dynamically updating the control law parameters in case of PV intermittency. Furthermore, a proportional resonant controller based on Naslin polynomial method is designed for the current control loop. The method describes a systematic procedure to calculate proportional gain, resonant gain, and all the coefficients for the resonant path. Finally, the proposed system is simulated in MATLAB and Simulink software to validate the analytical and theoretical concepts along with the efficacy of the proposed model.

Highlights

  • In recent years, Photovoltaic (PV) holds a pivotal position in ever-increasing energy demand due to easy accessibility, easy installation, high return on investment, and low maintenance cost [1]

  • Values presented in Table 3

  • The duty cycle of the switch is to 71% as depicted in Figure 12b, so that the converter can attain a voltage conversion ratio set10toand

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Summary

Introduction

Photovoltaic (PV) holds a pivotal position in ever-increasing energy demand due to easy accessibility, easy installation, high return on investment, and low maintenance cost [1]. A complete PV system consists of a PV array, DC–DC converter (optional), DC-link (DCL) capacitor, inverter, filter, and a grid. A single-stage system consists of a PV array, DCL capacitor, inverter, filter, and a grid. In this system, the weight and size of the system are considerably reduced but complexity is greatly increased due to the handling of different functionalities (Maximum Power Point Tracking (MPPT), current control, voltage control, and grid synchronization) by the inverter alone. For some applications, the PV voltage needed to be increased to the desired level that cannot be achieved without the use of a DC–DC converter. To reduce the system complexity and widen its applications range, a DC–DC converter is introduced in the two-stage configuration system [2].

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