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Topology (electrical circuits)

About: Topology (electrical circuits) is a research topic. Over the lifetime, 33316 publications have been published within this topic receiving 397651 citations. The topic is also known as: topology.


Papers
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Journal ArticleDOI
TL;DR: In this paper, an improved Z-source inverter topology is proposed to reduce the voltage stress and resonance between the Z-capacitors and Z-inductors.
Abstract: This paper proposes an improved Z-source inverter topology. Compared to previous Z-source inverter topology, it can reduce the Z-source capacitor voltage stress greatly, and has an inherent limitation to inrush current. The control strategy is exactly the same as the previous one, so all existing control strategies can be used directly. Soft-start strategy is also proposed to avoid the inrush current and resonance between the Z-capacitors and the Z-inductors. Comparison between the proposed and previous topologies is also presented. Analysis, simulation, and experimental results are presented to demonstrate the new features of the improved topology.

95 citations

Journal ArticleDOI
TL;DR: This letter describes a novel nine-level inverter based on switched capacitors (SCs) with quadruple-boost ability requiring reduced components with a comprehensive comparison against the state-of-the-art topologies in terms of the required number of components.
Abstract: This letter describes a novel nine-level inverter based on switched capacitors (SCs) with quadruple-boost ability requiring reduced components. The structure of the proposed topology relies on the series/parallel connection of SCs. It consists of 12 switches and two SCs. As opposed to similar SC-based inverters, the proposed topology does not employ a back-end H-bridge and the voltage stress of all the switches does not exceed twice the input dc voltage. A simple logic-gate-based pulsewidth-modulation scheme is developed for gating the switches of the proposed topology. A comprehensive comparison against the state-of-the-art topologies in terms of the required number of components is performed to attest the outperforming merits of the proposed topology. Finally, various experimental results are presented to validate the feasibility and operability of the proposed topology.

95 citations

Journal ArticleDOI
TL;DR: The proposed H5-D topology, in which a clamping diode is added on the basis of H5 topology to eliminate the CM voltage fluctuation, provides a new practical topology for distributed PV grid-connected power generation systems.
Abstract: Transformerless photovoltaic (PV) grid-connected inverters have become more and more popular in distributed PV power generation systems due to the advantages on high efficiency, low cost, and small size. However, common-mode (CM) current in the transformerless PV inverters can result in serious electromagnetic interference and insecurity, which will further reduce the reliability of the PV inverter systems. In this paper, an improved H5 topology, namely H5-D topology, is proposed, in which a clamping diode is added on the basis of H5 topology to eliminate the CM voltage fluctuation in H5 topology. Further, the PSIM simulation results of the H5-D topology and H5 topology are given and compared, especially, the performance of H5-D topology for CM current suppression is presented and analyzed concretely. Finally, the experimental prototypes of the H5-D topology and H5 topology are built and tested, and the experimental results validate the advantages of the H5-D topology. The proposed H5-D topology provides a new practical topology for distributed PV grid-connected power generation systems.

95 citations

Patent
Florin Oprescu1
16 Dec 1993
TL;DR: In this article, a hierarchical tree structure where there is only one root node is proposed and a signaling scheme is developed in which nodes via on board communications hardware, signal all connected nodes and respond accordingly until hierarchical relationships are established.
Abstract: A system and method are described which take an arbitrarily assembled collection of nodes on a bus or network and imposes an optimized hierarchical tree structure where there is only one root node. Nodes having both parent and child nodes are considered branch nodes while nodes having only parent nodes are leaf nodes. Loops or cycles in the physical topology are resolved into a logical topology that is acyclic and directed. A signaling scheme is developed in which nodes, via on board communications hardware, signal all connected nodes and respond accordingly until hierarchical relationships are established. Cycles are resolved by intelligently breaking links to yield an acyclic graph. Direction is established by each node recognizing its parent/child status with respect to connected nodes until a single node is established as a root node.

95 citations

Journal ArticleDOI
TL;DR: In this paper, a new module for multilevel inverters with reduced components is presented, which produces 25 levels using four asymmetrical DC voltage sources (two 1V DC and two 5V DC sources) and 10 semiconductor switches.
Abstract: This study presents a new module for multilevel inverters with reduced components Each module produces 25 levels using four asymmetrical DC voltage sources (two 1V DC and two 5V DC sources) and 10 semiconductor switches A significant advantage of the suggested module is its potentiality in producing voltage levels with negative polarity without any end side H-bridge inverter Therefore, switches with lower voltage ratings are used in its structure Series connection of the proposed structure leads to a modular topology which produces more voltage levels using reasonable number of switches, gate driver circuits, power diodes and less DC voltage sources These advantages are analysed by comparing this structure with other state-of-the-art topologies Selective harmonic elimination pulse width modulation (SHE-PWM) scheme is used to achieve output voltage with high quality To produce all voltage levels, two algorithms are proposed to determine DC voltage sources magnitude The accuracy of the suggested module performance in producing all voltage levels is verified by simulation and experimental results

95 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20233,701
20227,927
20212,733
20202,663
20192,742