SLIDING MODE CONTROLLED THREE-PORT BOOST CONVERTER WITH PARTIAL POWER PROCESSING FOR ON-BOARD ELECTRIC VEHICLE CHARGERS

Abstract

Using partial power processing (PPP) in the bidirectional DC-DC stage, this work aims to design and build a novel three-port boost AC-DC converter that enables on-board rapid charging for electric cars. The proposed three-port converter (TPC) significantly reduces charging time and allows higher-power operation without additional device stress, in contrast to conventional two-stage chargers that use a two-port AC-DC converter followed by a fullpower-processing (FPP) DC-DC converter. The PPP-based DC-DC stage reduces power processing in the power conversion chain, which further improves efficiency. With its three distinct output voltage levels, the suggested TPC also reduces switching losses. To control the flow of power between the battery, AC, and DC connections, a Sliding Mode Controller (SMC) is utilized. With the SMC, the converter can be reliably controlled regardless of the load, grid voltage, or battery status. Its ability to withstand external disturbances and parameter uncertainties allows it to regulate the DC-link voltage precisely, operate at unity power factor on the AC side, and respond quickly to transient situations. As a result, the charging process is more reliable and the system is more stable overall. When PPP and the suggested SMC-based control strategy are used together, the DC-DC stage processes a fraction of the total power, which leads to smaller converters, lower costs, and reduced losses. This is in comparison to traditional two-stage FPP-based chargers, and this is true even without the use of soft-switching techniques. We use a MATLAB/Simulink-based model for 6.6 kW to assess the performance of the proposed charger under various operating situations.