Partially isolated four port converter with combined PWM and secondary phase shift control

Abstract

A partially isolated four-port converter is proposed in this paper for interfacing two renewable sources and a storage device with an isolated load. This converter is capable of achieving high power density because of the effective sharing of devices among the input ports. Combined PWM and secondary phase shift control is employed to have a decoupled power flow management of input and output side ports. PWM control is used at the input side for maximum power tracking of renewable sources and battery power management. At the output side, secondary Phase shift control is used for controlling the output voltage. The adopted secondary phase shift control allows the primary switching legs to be operated with 1800 phase shift which results in reduced current ripple at input ports. The working principle of the converter, its output characteristics and control strategy are discussed. Working of the converter and its control strategy is verified through simulation for different input and output conditions. Further, to validate the simulation results, the experimental results of a 500W prototype are also provided.

Investigation of bidirectional three-phase four-leg converter with LCL filter

“…The general diagram of the UPS shown in Figure 1(a), close to that given in [14], [15], is considered. The converter under investigation Figure 1(b) consists of the following main elements: battery, isolated bidirectional DC-DC converter, for example in [16]- [18] bidirectional AC-DC converter, inductance (L), capacitance (C), and inductance (L) or LCL-filter providing electromagnetic compatibility of UPS with the grid and load. A distinctive feature of the UPS in paper is the usage of a three-phase four-leg converter (3F4LC) as a bidirectional AC-DC converter, which provides both power to single-phase/three-phase consumers when the battery is discharging and constant voltage stabilization at the input of the DC-DC converter when it is charging.…”

Autonomous power sharing for AC/DC HMGS using decentralized modified droop method for interlinking converter

“…DG source requires regular monitoring for valuable returns, as the power generated may not be utilized at that moment such power is stored in large capacity batteries, super capacitors, one such method of monitoring is done by fuzzy logic controller [3]. A four port converter is designed to control the secondary phase shifting for a PV and battery system for DC sub grid, the approach is achieved with simplified architecture, high power density and also eliminating the current ripples [4]. In contrast adaptive fractional fuzzy sliding mode control (AFFSMC) scheme is explained for power management (PM) with distinguish RES [5].…”