Control Challenges and Solutions for a Multi-Cellular Converter for Use in Electricity Networks

Watson, Alan J.; Dang, H.Q.S.; Wheeler, Patrick; Clare, Jon; Mondal, Gopal; Kenzelmann, Stephan; Rufer, A.; Novaes, Yales Rômulo de

doi:10.1080/09398368.2009.11463734

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Any asymmetries in the losses, dead times or switching times of the power switches is not accounted for and may therefore result in a small imbalance in the DC-link voltage magnitudes when operating as a rectifier. Such imbalances are present on many of these passive power balancing methods including PSC-PWM [28] and can be adjusted by accounting the instantaneous DC-link voltages into the control algorithm and ensuring that the cells are modulated in such a way that the best regulation of the voltage balance is achieved. Other algorithms require the use of added control loops to regulate the DC-link voltages [29], whereas the proposed technique does not require any additional computational overheads.…”

Section: Simulations Resultsmentioning

confidence: 99%

Distributed commutations pulse-width modulation technique for high-power AC/DC multi-level converters

Bifaretti

Tarisciotti

Watson

et al. 2012

IET Power Electronics

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This paper presents a novel dedicated PWM technique for use with single-phase multi-level Cascaded H-Bridge Converters. The proposed modulation strategy aims to minimize the converter commutations and distribute them, for any amplitude of the voltage reference, amongst the different converter cells in order to evenly distribute the heating and stress on the power switches, improving their reliability without compromising the quality of the voltage waveform. Such characteristics are particularly important in high power grid-connected converters used as an interface for renewable energy sources or Smart Grid applications. The technique is described in detail along with the verification of the modulation effectiveness provided by a simulation comparison with other common modulation strategies. Finally, the proposed strategy is experimentally validated by means of different tests using a seven level Cascaded H-Bridge Converter

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Section: Simulations Resultsmentioning

confidence: 99%

Distributed commutations pulse-width modulation technique for high-power AC/DC multi-level converters

Bifaretti

Tarisciotti

Watson

et al. 2012

IET Power Electronics

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“…In case the isolation is achieved through a dedicated converter building blocks interconnection, one suitable MP-SST configuration that ensures isolation between all ports consists of an ISOS connection of the circuit building blocks and the DAB converter as the core isolation component. As an example of this configuration, one of the major converter designs known in literature is the UNIFLEX SST project, supported and promoted by the European Community under the 6th Framework Programme [36][37][38][39][40][41][42][43]. The UNIFLEX topology is depicted in Figure 6.…”

Section: Fully Isolated Multi-port Solid-state Transformer Topologiesmentioning

confidence: 99%

Power Electronics Converters for the Internet of Energy: A Review

et al. 2022

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This paper presents a comprehensive review of multi-port power electronics converters used for application in AC, DC, or hybrid distribution systems in an Internet of Energy scenario. In particular, multi-port solid-state transformer (SST) topologies have been addressed and classified according to their isolation capabilities and their conversion stages configurations. Non-conventional configurations have been considered. A comparison of the most relevant features and design specifications between popular topologies has been provided through a comprehensive and effective table. Potential benefits of SSTs in distribution applications have been highlighted even with reference to a network active nodes usage. This review also highlights standards and technical regulations in force for connecting SSTs to the electrical distribution system. Finally, two case studies of multi-port topologies have been presented and discussed. The first one is an isolated multi-port bidirectional dual active bridge DC-DC converter useful in fast-charging applications. The second case of study deals with a three-port AC-AC multi-level power converter in H-Bridge configuration able to replicate a network active node and capable of routing and controlling energy under different operating conditions.

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“…A classical control scheme based on the current control in synchronous reference frame [25], [26] is shown in Figure 4. The current on the d-axis and q-axis, respectively Id and Iq, are regulated to the desired references Id * and Iq * using two PI controllers.…”

Section: A Pi Control In Synchronous Reference Framementioning

confidence: 99%

“…By knowing a priori the desired active vectors to be applied, the duty cycles can be calculated for any possible converter state and used to weight the cost function. The proposed control solution is demonstrated and tested for the simple case of the AC current control of a grid connected 3-phase converter, shown in figure 1, in order to better compare and contrast its performance against different control techniques, such as Proportional Integral (PI) control in a synchronous reference frame [25], [26], Dead Beat Control (DBC) [27]- [29], and traditional MPC. Using the Clarke's transform shown below, where x is a voltage or a current, it is possible to obtain a two phase (αβ) representation of the 3-Phase circuit shown in figure 2.…”

Section: Introductionmentioning

confidence: 99%

Modulated Model Predictive Control for a Three-Phase Active Rectifier

Tarisciotti

Zanchetta

Watson

et al. 2015

IEEE Trans. on Ind. Applicat.

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227

106

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Model predictive control (MPC) has a number of desirable attributes which are difficult to achieve with classical converter control techniques. Unfortunately, the nature of power electronics imposes restriction to the method, as a result of the limited number of available converter states. This, combined with the spread spectrum nature of harmonics inherent with the strategy, complicates further design. This paper presents a method for removing this characteristic without compromising the desirable functionality of predictive control. The method, named modulated MPC, is applied to a two-level three-phase converter and compared with a number of similar approaches. Experimental results are used to support theoretical analysis and simulation studies

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Control Challenges and Solutions for a Multi-Cellular Converter for Use in Electricity Networks

Cited by 5 publications

References 2 publications

Distributed commutations pulse-width modulation technique for high-power AC/DC multi-level converters

Distributed commutations pulse-width modulation technique for high-power AC/DC multi-level converters

Power Electronics Converters for the Internet of Energy: A Review

Modulated Model Predictive Control for a Three-Phase Active Rectifier

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