An improved DC current flow controller with double quadrants operation and fault isolation capability

Asymmetrical DC-DC Converter with Fault Tolerant Operation Capability for Distributed Generation

As the costs of manufacturing photovoltaic (PV) panels continue to decrease, the use of PV-based solar energy systems is seen in rise across the globe. This paper proposes an asymmetrical DC-DC converter for standalone solar energy systems. The converter is developed to control modularized PV panels with a combination of soft-switching, flyback-forward, high-step-up voltage ratio, and fault tol...

An improved LQR-based controller for switching DC-DC converters

In a previous paper, an account had been given to the various aspects for the control of PWM-type switching dc-dc converters, and an LQR-based digital combined observer controller had been proposed. This paper reports the progress on further research in this topic. It is found that the design of the state estimator (observer) according to the previous paper will lead to a steady-state error in ...

Isolated DC-DC Converters with High Current Capability

DC Fault Ride-through Capability and STATCOM Operation of a HVDC Hybrid Voltage Source Converter

HVDC transmission systems are becoming increasingly popular when compared to conventional AC transmission methods. HVDC voltage source converters (VSC) can offer advantages over traditional HVDC current source converter topologies; as such, it is expected that HVDC-VSCs will be further exploited with the growth of HVDC transmission. This paper presents the DC fault ride through capability and n...

A New Topology of Bidirectional Buck-Boost dc/dc Converter with Capability of Soft Switching and input Current Ripple Cancellation

In this paper, a new bidirectional buck-boost dc-dc converter with capability of soft switching and zero input current ripple is proposed. The coupled inductor is used in the proposed converter to eliminate the input current ripple. In the proposed converter, zero voltage switching (ZVS) and zero current switching (ZCS) can be obtained for the main and auxiliary switches, respectively. In addit...