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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.


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Journal ArticleDOI
TL;DR: By employing the proposed HCLC, dc line fault in the multiterminal system can be isolated effectively with existing DCCB technology, and fast system restoration without power interruption of healthy part can be achieved.
Abstract: The high fault current of dc line is a major threat to multiterminal voltage-source-converter-based HVDC (VSC-HVDC) system. However, dc circuit breaker (DCCB) with large capacity and fast breaking speed is still under development. Therefore, fault current limitation is vital for the multiterminal VSC-HV DC system. This paper proposes a simple and easily applied hybrid current-limiting circuit (HCLC) at dc side, which consists of a current-limiting inductor (CLI) and an energy dissipation circuit (EDC) in parallel with the CLI. The CLI is designed to reduce the requirement for the DCCB's capacity and breaking speed. The EDC, which consists of thyristor-controlled resistors, is proposed to reduce the stress on energy absorption element (metal oxide arrester) in DCCB and to accelerate the fault current interruption. The design and discussion about the HCLC parameters are performed in detail. By employing the proposed HCLC, dc line fault in the multiterminal system can be isolated effectively with existing DCCB technology, and fast system restoration without power interruption of healthy part can be achieved. Numerous simulations with real-time digital simulator and comparisons with traditional schemes have demonstrated the promising performance of the proposed HCLC. The effectiveness of the HCLC's topology has also been verified by a simplified and scaled test circuit.

110 citations

Journal ArticleDOI
TL;DR: In this paper, a multiple-input non-isolated DC/DC converter topology is presented for energy diversification from renewable and storage energy sources individually or simultaneously, which can be operated in buck, boost and buck-boost modes of operation with the capability of bidirectional power flow to achieve desired voltage level on either side.
Abstract: In this study, a multiple-input non-isolated DC/DC converter topology is presented. The proposed multiple-input DC/DC converter is proficient for energy diversification from renewable and storage energy sources individually or simultaneously. It can be operated in buck, boost and buck–boost modes of operation with the capability of bidirectional power flow to achieve desired voltage level on either side. The development of small-signal modelling based on state-space averaging has been discussed. In addition, a power management control scheme for the proposed converter has also been presented. The proposed concept has been investigated through simulation using the MATLAB/Simulink environment and validated experimentally on a laboratory prototype using dSPACE 1103 real time digital controller.

110 citations

Journal ArticleDOI
TL;DR: This paper presents the control of a Z-source neutral point clamped inverter using the space vector modulation technique, which enables the operation of the Z- source arrangement to be optimized and implemented digitally without introducing any extra commutations.
Abstract: The Z-source inverter is a relatively recent converter topology that exhibits both voltage-buck and voltage-boost capability. The Z-source concept can be applied to all dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversion whether two-level or multilevel. However, multilevel converters offer many benefits for higher power applications. Previous publications have shown the control of a Z-source neutral point clamped inverter using the carrier-based modulation technique. This paper presents the control of a Z-source neutral point clamped inverter using the space vector modulation technique. This gives a number of benefits, both in terms of implementation and harmonic performance. The adopted approach enables the operation of the Z-source arrangement to be optimized and implemented digitally without introducing any extra commutations. The proposed techniques are demonstrated both in simulation and through experimental results from a prototype converter.

109 citations

Posted Content
TL;DR: In this article, the authors provide an elementary introduction to the role of topology in active matter through experimentally relevant examples, focusing on topological defects and topologically protected edge modes with an emphasis on the distinctive properties they acquire in active media.
Abstract: Active matter encompasses different nonequilibrium systems in which individual constituents convert energy into non-conservative forces or motion at the microscale. This review provides an elementary introduction to the role of topology in active matter through experimentally relevant examples. Here, the focus lies on topological defects and topologically protected edge modes with an emphasis on the distinctive properties they acquire in active media. These paradigmatic examples represent two physically distinct classes of phenomena whose robustness can be traced to a common mathematical origin: the presence of topological invariants. These invariants are typically integer numbers that cannot be changed by continuous deformations of the relevant order parameters or physical parameters of the underlying medium. We first explain the mechanisms whereby topological defects self propel and proliferate in active nematics, leading to collective states which can be manipulated by geometry and patterning. Possible implications for active microfluidics and biological tissues are presented. We then illustrate how the propagation of waves in active fluids and solids is affected by the presence of topological invariants characterizing their dispersion relations. We discuss the relevance of these ideas for the design of robotic metamaterials and the properties of active granular and colloidal systems. Open theoretical and experimental challenges are presented as future research prospects.

109 citations

Journal ArticleDOI
07 Oct 1990
TL;DR: In this paper, a two-switch topology with no "shoot-through" paths, high input to output voltage gain, low and constant switching frequencies, and practically instantaneous recovery from input or output transients is proposed.
Abstract: A high-performance current regulated single-phase DC/AC converter module is proposed in this paper. Its novel features include: a two-switch topology with no "shoot-through" paths, high input to-output voltage gain, low and constant switching frequencies, and practically instantaneous recovery from input or output transients. Moreover, by utilizing an inner filter capacitor current control loop the proposed module can maintain nearly perfect sinusoidal output voltages even with highly nonlinear loads. Furthermore, three-phase operation can be obtained easily by using three of these modules. Finally, the paper includes the analysis and design of the converter power and control circuits and the experimental evaluation of key predicted results. >

109 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