A New High-Gain DC-DC Converter with Continuous Input Current for DC Microgrid Applications

Abstract

The growth of renewable energy in the last two decades has led to the development of new power electronic converters. The DC microgrid can operate in standalone mode, or it can be grid-connected. A DC microgrid consists of various distributed generation (DG) units like solar PV arrays, fuel cells, ultracapacitors, and microturbines. The DC-DC converter plays an important role in boosting the output voltage in DC microgrids. DC-DC converters are needed to boost the output voltage so that a common voltage from different sources is available at the DC link. A conventional boost converter (CBC) suffers from the problem of limited voltage gain, and the stress across the switch is usually equal to the output voltage. The output from DG sources is low and requires high-gain boost converters to enhance the output voltage. In this paper, a new high-gain DC-DC converter with quadratic voltage gain and reduced voltage stress across switching devices was proposed. The proposed converter was an improvement over the CBC and quadratic boost converter (QBC). The converter utilized only two switched inductors, two capacitors, and two switches to achieve the gain. The converter was compared with other recently developed topologies in terms of stress, the number of passive components, and voltage stress across switching devices. The loss analysis also was done using the Piecewise Linear Electrical Circuit Simulation (PLCES). The experimental and theoretical analyses closely agreed with each other.

Improved Quadratic Boost High-Gain DC-DC Converter Based on Constant Off-Time Control Mode

“…e rapid development of integrated circuit technology and the huge demand in the consumer market are driving the development of all kinds of electronic products towards intelligence, multifunctionality, and e ciency [1]. A wide range of portable electronic lifestyle products such as smartphones, tablets, personal digital assistants (PDAs), and handheld electronic devices have become part of people's working life, and the working duration of these electronic devices is directly determined by the power supply.…”

Independent Double-Boost Interleaved Converter with Three-Level Output

“…On the other hand, this type of converter exhibits a limited voltage gain. High-gain interleaved DC-DC voltage converters in transformerless structures have been explored in various studies [10][11][12][13]. A floating, high-gain voltage interleaved converter widely employed in research studies was analyzed in [14,15].…”

A Family of Transformerless Quadratic Boost High Gain DC-DC Converters

“…These converters mostly utilize VMC and several inductors and capacitors to achieve the high voltage gain. Non-isolated topologies of these converters are suitable in microgrid operations [25][26][27][28] for medium power applications. These converters can be put at the front end of the inverter to maintain the DC-link voltage.…”