Control and Fault Handling in a Modular Series-Connected Converter for a Transformerless 100 kV Low-Weight Offshore Wind Turbine

Gjerde, Sverre Skalleberg; Olsen, Pål Keim; Ljøkelsøy, Kjell; Undeland, Tore

doi:10.1109/tia.2013.2272032

Cited by 48 publications

(45 citation statements)

References 12 publications

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“…In this scenario the -phase machine is supplied from VSCs ( =3 ) that can be arranged in different manners. Parallel connection of VSCs connected to a single dc-link has been suggested to diminish the post-fault derating of the system [6] and series connection is claimed to favour the medium-voltage gridside connection because it elevates the dc-link voltage level [30][31]. However, the most simple and popular topology is the use of independent BTB modules connected to the sets of three-phase windings [27][28][29].…”

Section: A Description Of the Topologymentioning

confidence: 99%

“…2b), thus confirming the benefit ii) listed in the introduction section. It is important to highlight that lower values of are specially appreciated in seriesconnected topologies [30][31] because higher imbalance in the current sharing complicates the dc-link voltage balancing task. Needless to say that lower losses are always beneficial and lead to better system efficiency.…”

Section: Dc-linkmentioning

confidence: 99%

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Impact of Postfault Flux Adaptation on Six-Phase Induction Motor Drives With Parallel Converters

González-Prieto

Durán

Barrero

et al. 2017

IEEE Trans. Power Electron.

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Abstract-The redundancy of multiphase drives provides an inherent fault-tolerant capability that is appreciated in applications with a complicated corrective maintenance or safety-critical requirements. Fault restrictions however force the system to be reconfigured to operate in a smooth and efficient manner. Previous works have been focused on the optimization of current waveforms to generate an undisturbed operation but still maintaining the pre-fault rated flux settings. This work shows that efficient controllers can improve the post-fault performance in six-phase induction machines supplied by parallelconnected converters if offline optimization is used to obtain a variable reference flux. Theoretical and experimental results confirm that the proposed flux adaptation method provides higher torque/power capability, lower degree of imbalance in the current sharing between windings and efficiency improvement.

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Section: A Description Of the Topologymentioning

confidence: 99%

Section: Dc-linkmentioning

confidence: 99%

Impact of Postfault Flux Adaptation on Six-Phase Induction Motor Drives With Parallel Converters

González-Prieto

Durán

Barrero

et al. 2017

IEEE Trans. Power Electron.

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“…1b), which can be multilevel in order to reduce the voltage stress of the IGBTs and improve the current quality [8]. The main idea is to maintain low voltage on the machine-side but elevate the dc-link voltage to allow medium voltage at the grid-side [9][10][11]. This in turn reduces the current rating and the cable size for the given power, hence giving a potential overall capital cost reduction.…”

Section: Six-phase Energy Conversion Systems' Topologiesmentioning

confidence: 99%

“…Industrial examples of multiphase systems with full-power BTB converters are the 1.1 MW nine-phase permanent magnet (PM) motor drive used in ultra-high speed elevators [5] (motoring) and the 5 MW twelve-phase PM synchronous generator used in wind energy turbines [6] (generation). The combination of different number of phases and converter arrangements results in multiple multiphase topologies, including the use of independent BTB three-phase modules [5][6], the use of parallel three-phase converters [7], and the series-connection of machine-side converters [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…This implies in turn that topologies with independent dc-links [5][6] need to disable the set of windings supplied by the faulty converter, whereas topologies with series connection of VSCs [8][9][10][11] cannot continue operating. The situation differs in the scenario considered in this work because single converter faults only imply a reduction in the per-phase current.…”

Section: Introductionmentioning

confidence: 99%

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Fault-Tolerant Operation of Six-Phase Energy Conversion Systems With Parallel Machine-Side Converters

González-Prieto

Durán

Seng

et al. 2016

IEEE Trans. Power Electron.

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Abstract The fault tolerance provided by multiphase machines is one of the most attractive features for industry applications where a high degree of reliability is required. Aiming to take advantage of such post-fault operating capability, some newly designed full-power energy conversion systems are selecting machines with more than three phases. Although the use of parallel converters is usual in high-power three-phase electrical drives, the fault tolerance of multiphase machines has been mainly considered with single supply from a multiphase converter. This work addresses the faulttolerant capability of six-phase energy conversion systems supplied with parallel converters, deriving the current references and control strategy that need to be utilized to maximize torque/power production. Experimental results show that it is possible to increase the post-fault rating of the system if some degree of imbalance in the current sharing between the two sets of three-phase windings is permitted.Index Terms Multiphase energy conversion systems, fault tolerance, parallel converters, field oriented control.

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Sensor fault control scheme for a variable speed wind energy system in a stand-alone DC micro grid

Sowmmiya

Uma

Uandai

2018

Int Trans Electr Energ Syst

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This paper describes sensor fault control (SFC) scheme for a wound rotor induction generator (WRIG)-based wind energy system (WES) connected to a standalone DC micro grid (DCM). The DCM provides excitation for WRIG through a rotor side converter (RSC). The stator voltage and frequency are regulated using PI controllers. The generated power is supplied to loads, and excess power is supplied to DCM by PWM rectification operation of RSC. During stall mode, DCM supplies load through RSC by PWM inversion operation. To execute a smooth changeover of modes, supervisory control algorithm is employed.The control scheme involves sensors which may not be ideal and if fault occurs might lead to system collapse. To compensate the electrical sensor faults, a fault detection and compensation (FDC) scheme based on adaptive neuro-fuzzy inference system (ANFIS) is employed. For compensating mechanical sensor faults, an electrical sensor is employed. The system is experimentally tested to show the effectiveness of SFC scheme.

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Control and Fault Handling in a Modular Series-Connected Converter for a Transformerless 100 kV Low-Weight Offshore Wind Turbine

Cited by 48 publications

References 12 publications

Impact of Postfault Flux Adaptation on Six-Phase Induction Motor Drives With Parallel Converters

Impact of Postfault Flux Adaptation on Six-Phase Induction Motor Drives With Parallel Converters

Fault-Tolerant Operation of Six-Phase Energy Conversion Systems With Parallel Machine-Side Converters

Sensor fault control scheme for a variable speed wind energy system in a stand-alone DC micro grid

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