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DC circuit breakers are needed in future HVDC grids to provide selectivity in clearing DC faults and to achieve continuous operation of the healthy part of the grid. Standard mechanical circuit breakers as used in AC systems cannot be used in HVDC applications due to the lack of current zero-crossing, which is essential for arc extinction. To use mechanical interrupters for fault current interruption...
This paper shows that the ZETA-SEPIC converter can be used as a bidirectional charging system between a high DC link voltage and a low voltage battery system. Main advantages are transformerless operation and that the coupling capacitor protects and separates both sides of the converter in case of short circuits.
Two-phase residential installations have become very common in Ecuador since different policies prompt the users to replace gas stoves and water heaters by electric appliances. The addition of a second phase to the originally installed single-phase wiring is required to obtain 220Vrms. This fact carries an intrinsic unbalance since single- and two-phase loads coexist. In this paper a topology for...
DC/DC converters are necessary in HVDC networks to adapt different voltage levels, different configurations or to participate in power flow control. This paper focuses on a recent DC/DC converter topology, called Modular Multilevel DC Converter (M2DC), which uses direct DC/DC connection without galvanic separations. A general analysis of the topology is firstly discussed. Afterwards a decoupled mathematical...
This paper proposed a new Power Electronic Transformer (PET) topology in medium and high voltage application of 3-phase AC distribution network. In the proposed topology, diode clamped multilevel converter is used as the rectifier stage, and input series output parallel (ISOP) Dual Active Bridges are adopted for isolated voltage conversion. The proposed topology is suitable for medium and high voltage...
In recent years, significant progress has been made in HVDC transmission by the advent of voltage-source-converter (VSC) technology using modular multilevel converters. There is increasing demand to interconnect the existing HVDC lines into meshed HVDC grids for better renewable energy penetration. In this paper, a series of power electronic topologies, all based on the front-to-front VSC structure,...
In recent years, photovoltaic (PV) systems have been widely used for power generation and renewable energy. However, a lot of electromagnetic interferences (EMI), which will influence the normal performance and operation of other electrical devices, have been generated seriously by the PV converter, especially the conducted EMI noises from 9kHz to 30MHz. To mitigate the conducted EMI noises, the topology...
A novel bidirectional dc circuit breaker topology is investigated for operation in dc microgrids to help in protection schemes against short circuit faults. When a short-circuit fault occurs, the proposed topology utilizes a Z-source breaker circuit to naturally commutate off the SCR by diverting the current and reducing the current to zero through the SCR, thus avoiding circuit breaking under high...
This paper proposes a topology of single input multiple-output DC-DC converter by integrating Sepic, Flyback and Boost configuration, whose individual outputs when series connected, results in very high DC-DC conversion ratio. The salient features of the proposed topology are less number of components resulting in a compact structure, less voltage stress of the power electronic devices, high efficiency...
This paper studies a battery-powered high step-up front-end converter for automotive audio amplifier. The proposed converter uses an interleaved structure with one-phase utilizing a conventional boost converter and the second-phase uses its inverted version. By this technique a high step-up voltage gain can be obtained as compared to the conventional two-phase interleaved boost converter. Operating...
A renewed interest for dc breakers has evolved owing to the visions of connecting several HVDC links into a HVDC grid. Several breaker concepts have been presented and some also have been implemented and tested. A new approach is proposed in this paper. The fundamental principle is to take advantage of the fast recovery of the voltage withstand capability in a Vacuum Interrupter (VI) when the current...
The analysis DC-DC Double Quadratic Buck Converter is presented in this paper. This converter has the advantages of high static gain compared to the conventional Buck Converter. The topological symmetry reduce the stress voltage over the switches to half of the value compared with the conventional Quadratic Buck Converter and simplifies the modeling of the converter. The analysis is made for continuous,...
This paper deals with the fault tolerance analysis applied to the converter topology 5-level unidirectional T-Rectifier (5L T-RECT) to be used for electric generating applications. The proposed generating unit is intended for aerospace applications with high fundamental electric frequency, to this purpose the investigated power electronic converter configuration is able to supply power to the electric...
The focus of this paper is to develop a framework to evaluate and analyze the reliability of the power electronic circuits in electric vehicle chargers, which are expected to be a major component of the utility load in the future. A general infrastructure of electric vehicle charging systems is described and different charging levels are discussed. To illustrate a numerical reliability analysis, two...
The paper presents new topology for flyback converter which can be used for various applications. Generally in a flyback converter there is one primary winding and other secondary winding. But new topology deals with the introduction of tertiary winding which would create multiple outputs on secondary side. On one side there will be traditional DC output and on the other side there will be AC output...
Interleaved double dual boost (IDDB) DC-DC converters are widely used in high-power renewable energy conversion applications, which can provide both high step-up ratio and low current ripple. This paper is focused on the nonlinear modeling and control of non-ideal IDDB converter. A sliding mode controller is design based on the model with parasitics considered. Some key issues on the control design...
Contactless Capacitive Power Transfer (CPT) is one of the emerging fields in the area of wireless power transfer. The system is fairly analogues to the inductive power transfer system. The CPT systems was primarily used for low power and small distance applications due to the development of unsafe voltages across the capacitive interface. However, the use of new compensation networks have enabled...
Requests for high quality and continuity of supply have led to the study of DC micro-grids. The realization of these networks would allow exploitation of DC advantages, but it would also create fault clearance and selectivity problems because semi-conductors suffer over-currents and over-voltages. The use of traditional DC circuit breakers is often not acceptable. As an alternative, static switches...
A new scheme of a step-up converter with very high voltage gain is analyzed in this paper. The scheme is based on the combination of the switched-coupled-inductor boost converter and the diode-capacitor Cockoft-Walton multiplier. The scheme provides a soft commutation of the switch and the diodes. The paper analyzes the main modes of operation and obtained the formulas for determining the DC voltage...
In this paper, four three-phase/four-wire dc/ac converter topologies assembled with three-level and two-level legs are proposed. Several relevant characteristics of the converters are addressed, such as voltage capability, harmonic distortion, and power losses. Experimental and simulated results are presented.
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