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This paper presents a procedure for modelling and controlling a single-phase, two-stage, bidirectional DC–AC converter for application of energy storage system (ESS) in autonomous microgrids, in addition to experimental verification of its uninterruptible power supply (UPS) functionality. Average theory and frequency analysis are utilized to model the power converters and design the controllers in...
In this paper, it is presented a procedure to simplify the well-known average model as well as to approximate the controller design for a Pulse-Width-Modulation (PWM) based power converter that transforms energy from some DC source (such as batteries or fuel cells) into an AC voltage source. The power converter studied is formed by two stages: a DC-DC bidirectional converter (boost) and a DC-AC H-bridge...
The microgrid is some part of the electric grid that can disconnect and operate autonomously, therefore it is becoming a broadly discussed theme in the ecosystem of the distribution domain. Moreover, distributed generation and distributed storage may function cooperatively towards balancing energy supply and demand, as well as managing system stability and power quality. In this context, the vastly...
This paper develops the droop control strategy to connect multiple different types of converters in parallel in an isolated single-phase low voltage microgrid. First, the traditional droop control for low voltage microgrids is explained. Then three different types of converters in a microgrid are described, and different droop equations are proposed for each converter to overcome the line impedance...
The objective of this work is to get an understandable model of a single-phase Uninterruptible Power Supply (UPS), as well as design and verify the controllers for the UPS. To make the procedure more comprehensive, a basic single-phase UPS is proposed, so it is formed by a battery bank and a bidirectional full-bridge converter (with LC filter and transformer included). The single-phase full-bridge...
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