A three port high gain non-isolated DC-DC converter for photovoltaic applications

Abstract

In photovoltaic (PV) applications, power electronic converters play a vital role in transferring power from source to load. In general, operating voltages of PV arrays are low. To interface them with high voltage DC bus, a high voltage conversion system is needed which is provided by high gain topologies. Moreover, to increase the power density, efficiency of conversion and decrease cost, recent developments involve use of multiport converters which are in general multi-input converters capable of interfacing different renewable sources to a single structure. However many topologies reported in the literature achieve only nominal voltage gain between source and output. In this paper, a new topology is proposed by combining the advantages of both high gain and multi-input converters. The proposed topology has two input ports (i) A bidirectional port for energy storage device (ii) A unidirectional port for PV source. Coupled inductor technique is used to obtain high voltage gain. The topology along with theoretical analysis is presented to explain the principle of operation. This analysis is then compared with simulation results from MATLAB-Simulink to validate operating principle of the proposed topology.

Comparative analysis on selection and synthesis of multiple input converters: a review

“…In these structures, the energy sources are parallel to the sources during charging, and further, all the sources can simultaneously or independently supply power to the load. These structures possess the bidirectional power flow only for the ESS [23, 32, 34, 39–44, 49, 50, 53, 56, 64, 65, 98].…”

“…For instance, state-of-the-art emphasising the topology has been presented in [12][13][14][15][16][17][18][19][20][21][22][23][24], whereas, state-of-the-art discussed in [25][26][27][28][29][30][31][32][33][34][35][36] emphasises on the MIC for hybrid energy systems applications. Further, MIC for PV applications has been reported in [11,[37][38][39][40][41][42][43][44][45] and MIC for hybrid vehicles has been discussed in [33,35,[45][46][47][48][49][50]. The researchers evolved and are still evolving newer topologies with an application-oriented approach.…”

Non-Isolated High-Gain Triple Port DC–DC Buck-Boost Converter With Positive Output Voltage for Photovoltaic Applications

“…A triple port high gain non-isolated DC-DC converter for PV application addressed by [12], which uses a coupled inductor technique to obtain high voltage gain. The solution to feeding PV energy to high voltage DC bus is achieved and suitable for multiple renewable energy sources due to its multiple input capability.…”

Novel Three-Port Bidirectional DC/DC Converter with Three-Winding Coupled Inductor for Photovoltaic System

“…According to the measurement results, the highest efficiency of the PV step-up mode is 95.3%, the highest efficiency of the battery step-up mode is 94.1%, and the highest efficiency of the step-down mode is 94.8%.Energies 2020, 13, 1132 2 of 25 or to satisfy excess energy demands through a battery. When a solar system generates insufficient or no energy owing to environmental factors or at night, energy will be supplied by a battery, thereby considerably improving the stability of the energy system [2][3][4][5][6].high-efficiency single-input multiple-output bidirectional isolated converter in which the leakage inductance energy of the coupled inductor is recovered through the clamp capacitor to the power supply terminal and zero-voltage switching (ZVS) is implemented in the converter switch to reduce the switching loss; however, the auxiliary power supply terminal cannot be stepped down/stepped up to other power supply terminals in this topology. Another study [21] proposed a high-conversion-ratio isolated bidirectional converter with a half-bridge LLC topology and dc-blocking capacitor on the high-voltage side.…”

“…Energies 2020, 13, 1132 2 of 25 or to satisfy excess energy demands through a battery. When a solar system generates insufficient or no energy owing to environmental factors or at night, energy will be supplied by a battery, thereby considerably improving the stability of the energy system [2][3][4][5][6].…”