Analysis, Design, Modeling, and Control of an Interleaved-Boost Full-Bridge Three-Port Converter for Hybrid Renewable Energy Systems

Abstract

Abstract-This paper presents the design, modelling and control of a three-port (TPC) isolated dc-dc converter based on interleaved-boost-full-bridge with pulse-width-modulation and phase-shift control for hybrid renewable energy systems. In the proposed topology, the switches are driven by phase-shifted PWM signals, where both phase angle and duty cycle are controlled variables. The power flow between the two inputs is controlled through the duty cycle, whereas the output voltage can be regulated effectively through the phase-shift. The primary side MOSFETs can achieve zero-voltage switching (ZVS) operation without additional circuitry. Additionally, due to the ac output inductor, the secondary side diodes can operate under zerocurrent switching (ZCS) conditions. In this work, the operation principles of the converter are analyzed and the critical design considerations are discussed. The dynamic behavior of the proposed ac inductor based TPC is investigated by performing state-space modelling. Moreover, the derived mathematical models are validated by simulation and measurements. In order to verify the validity of the theoretical analysis, design and power decoupling control scheme, a prototype is constructed and tested under the various modes, depending on the availability of the renewable energy source and the load consumption. The experimental results show that the two decoupled control variables achieve effective regulation of the power flow among the three ports.Index Terms-Three-port converter, state-space modelling, renewable energy, energy storage, phase-shift and duty cycle control.

Analytical comparison of dual-input isolated dc-dc converter with an ac or dc inductor for renewable energy systems

“…12, at V 1 = 50, V 2 = 100 V, and V o = 370 V. A peak efficiency of 97.5% is achieved. More detailed analysis about the experimental test on the ac-inductor based converter have been reported in [16].…”

“…For the ac-inductor topology, as discussed in [16], taking into account the amount of stored energy in the MOSFETs' output capacitance (C oss ), all MOSFETs can obtain ZVS operation, if (22) is satisfied; in other words, during the deadtime there is significant energy stored in the ac inductor to charge/discharge the output capacitance of the MOSFETs triggered off.…”

MOSFET‐clamped three‐level converters without flying capacitor

“…The duty cycle d max is selected as 0.9. When d 1 is selected as d max at U in = 20 V, n is chosen as 21.5 from (6). The core of the transformer is selected as ferrite EE55B core.…”

A new switched‐capacitor/switched‐inductor–based converter with high voltage gain and low voltage stress on switches

“…With the growth of renewable energy sources, such as photovoltaic and fuel cells, improved dc‐dc boost converters with higher conversion ratios and on the other hand with lower voltage tensions on semiconductor elements are needed to achieve higher efficiencies . A dc‐dc boost converter with the mentioned characteristics have multiple applications in energy conversion units of electrical vehicles, hybrid energy systems, battery power supplies, and so on . Achieving high voltage gains in conventional dc‐dc boost converters by increasing the duty cycle of the converter is possible, but in that way, large voltage spikes may occur and conduction losses and reverse‐recovery time problem of the diodes would happen.…”

“…1,2 A dc-dc boost converter with the mentioned characteristics have multiple applications in energy conversion units of electrical vehicles, hybrid energy systems, battery power supplies, and so on. [3][4][5] Achieving high voltage gains in conventional dc-dc boost converters by increasing the duty cycle of the converter is possible, 6 but in that way, large voltage spikes may occur and conduction losses and reverse-recovery time problem of the diodes would happen. Therefore, increasing the level of voltage of dc-dc converters through increasing the duty cycle of switches is not a good option.…”