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In the coming decades, electrical energy networks will gradually change from a traditional passive network into an active bidirectional one using concepts such as these associated with the smart grid.\ud \ud Power electronics will play an important role in these changes. The inherent ability to control power flow and respond to highly dynamic network will be vital. Modular power electronics structures which can be reconfigured for a variety of applications promote economies of scale and technical advantages such as redundancy. The control of the energy flow through these converters has been much researched over the last 20 years.\ud \ud This thesis presents novel control concepts for such a structure, focusing mainly on the control of a Cascaded H-Bridge converter, configured to function as a solid state substation. The work considers the derivation and application of Dead Beat and Model Predictive controllers for this application and scrutinises the technical advantages and potential application issues of these methodologies. Moreover an improvement to the standard Model Predictive Control algorithm that include an intrinsic modulation scheme inside the controller and named Modulated Model Predictive Control is introduced.\ud \ud Detailed technical work is supported by Matlab/Simulink model based simulations and validated by experimental work on two converter platforms, considering both ideal and non-ideal electrical network conditions.
[1] Advanced Power Electronic Conversion and Control System for Universal and Flexible Power Management, S. Bifaretti, P. Zanchetta, A. Watson, L. Tarisciotti, J. Clare, IEEE Transactions on Smart Grid, vol.2, no.2, pp.231-243, June 2011, 10.1109/TSG.2011.2115260.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5739137&isnumber=5772087 [2] Distributed commutations pulse-width modulation technique for high-power AC/DC multilevel converters, S. Bifaretti, L. Tarisciotti, P. Zanchetta, A. Watson, J. Clare, A. Bellini., IET Power Electronics, vol.5, no.6, pp.909-919, July 2012, 10.1049/iet-pel.2011.0281.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6294949&isnumber=629492 [3] Modulated Model Predictive Control for a 7-Level Cascaded H-Bridge Back-To-Back Converter, L. Tarisciotti, P. Zanchetta, A. Watson, J. Clare, S. Bifaretti, IEEE Transactions on Industrial Electronics, vol.61, no.10, pp.5375-5383, 2014, 10.1109/TIE.2014.2300056.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6712126&isnumber=4387790 [4] Active DC voltage balancing PWM technique for High-Power Cascaded multilevel converters, L. Tarisciotti, S. Bifaretti, P. Zanchetta, A. Watson, J. Clare, P. Wheeler, IEEE Transactions on Industrial Electronics, vol.61, no.11, pp.6157-6167, 10.1109/TIE.2014.2308139.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6748051&isnumber=4387790 [5] Modulated Model Predictive Control (M2PC) for a 3-Phase Active Front-End, L. Tarisciotti, S. Bifaretti, P. Zanchetta, A. Watson, J. Clare, M. Degano, IEEE Transactions on Industry Applications, vol.PP, no.1, pp.1-1, 10.1109/TIA.2014.2339397.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6856143&isnumber=4957013 [6] Predictive control for universal and flexible power management, S. Bifaretti, P. Zanchetta, A. Watson, L. Tarisciotti, J. Clare, IEEE Energy Conversion Congress and Exposition (ECCE), pp.3847-3854, Sept. 2010, 10.1109/ECCE.2010.5617765.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5617765&isnumber=5617696 [7] A modulation technique for high power AC/DC multilevel converters for power system integration, S. Bifaretti, P. Zanchetta, A. Watson, A. Bellini, L. Tarisciotti, J. Clare, IEEE Energy Conversion Congress and Exposition (ECCE), 2010, pp.3697-3704, Sept. 2010, 10.1109/ECCE.2010.5618345.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5618345&isnumber=5617696 [8] An improved Dead-Beat current control for Cascaded H-Bridge active rectifier with low switching frequency, L. Tarisciotti, A. Watson, P. Zanchetta, S. Bifaretti, J. Clare, P. Wheeler, 6th IET International Conference on Power Electronics, Machines and Drives (PEMD), 2012, 10.1049/cp.2012.0219.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6242069&isnumber=6241991 [9] Novel Pulse Width Modulation technique with active DC voltage balancing and device voltage falls compensation for High-Power Cascaded multilevel active rectifiers, L.
Tarisciotti, P. Zanchetta, A. Watson, J. Clare, P. Wheeler, S. Bifaretti, IEEE Energy Conversion Congress and Exposition (ECCE), pp.2229-2236, 2012, 10.1109/ECCE.2012.6342438.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6342438&isnumber=634215 [10] Modulated Model Predictive Control (M2PC) for a 3-phase active front-end, L. Tarisciotti, P. Zanchetta, A. Watson, J. Clare, M. Degano, S. Bifaretti, IEEE Energy Conversion Congress and Exposition (ECCE), pp.1062-1069, 2013, 10.1109/ECCE.2013.6646821.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6646821&isnumber=664666 iv [11] A comparison between dead-beat and predictive control for a 7-level back-to-back Cascaded H-Bridge under fault conditions, L. Tarisciotti, P. Zanchetta, A. Watson, J. Clare, S. Bifaretti, IEEE Energy Conversion Congress and Exposition (ECCE), pp.2147-2154, 2013, 10.1109/ECCE.2013.6646972.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6646972&isnumber=664666 [12] A simple deadbeat current control for single-phase transformerless inverters with LCL filter, G. Buticchi, D. Barater, L. Tarisciotti, P. Zanchetta, IEEE Energy Conversion Congress and Exposition (ECCE), pp.4214-4220, 2013, 10.1109/ECCE.2013.6647262.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6647262&isnumber=6646663 [13] A new predictive control method for cascaded multilevel converters with intrinsic modulation scheme, L. Tarisciotti, P. Zanchetta, A. Watson, J. Clare, S. Bifaretti, M. Rivera, 39th Annual Conference of the IEEE Industrial Electronics Society (IECON), pp.5764-5769, 2013, 10.1109/IECON.2013.6700079 http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6700079&isnumber=6699103 [14] Finite Set Model Predictive Control with a novel online grid inductance estimation technique, B. Arif, L. Tarisciotti, P. Zanchetta, J. Clare, 7th IET International Conference on Power Electronics, Machines and Drives (PEMD), pp.1-6, 2014, 10.1049/cp.2014.0299.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6836947&isnumber=6836771 [15] Improving power quality with multi-objective Modulated Model Predictive Control, L.
Tarisciotti, P. Zanchetta, A. Watson, J. Clare, S. Bifaretti, IEEE Energy Conversion Congress and Exposition (ECCE), 2014 [16] Modular Photovoltaic Inverter with High-Frequency DC/DC Stage Based on GaN FET, F.
Giuliani, G. Buticchi, D. Barater, L. Tarisciotti, P. Cova, C. Concari, N. Delmonte, R. Menozzi, IEEE Energy Conversion Congress and Exposition (ECCE), 2014.
[17] Integrated grid estimation technique for Finite Control Set Model Predictive Control in grid connected converters, B. Arif, L. Tarisciotti, P. Zanchetta, J. Clare, IEEE Energy Conversion Congress and Exposition (ECCE), 2014 [18] High-Dynamic Single-Phase Hilbert-Based PLL for Improved Phase-Jump Ride-Through in Grid-Connected Inverters, G. Buticchi, D. Barater, L. Tarisciotti, P. Zanchetta, IEEE Energy Conversion Congress and Exposition (ECCE), 2014 Figure 6.17 AC Current, Current reference, AC Voltage and Current Harmonic content for unbalanced DC loads .
................................................................................................................................................................ - 99 - Figure 6.19 Seven Level CHB converter used for experimental verification........................................................... - 101 - Figure 6.20 DCM: modulated voltage waveforms and current for 50 Hz modulating signal in open-loop configuration.
.............................................................................................................................................................. - 102 - Figure 6.21 DCM: AC current, AC voltage and modulated voltage waveform for 50 Hz modulating signal in closed-loop configuration. ....................................................................................................................................... - 103 - Figure 6.22 Modulated voltage waveforms and AC current for 50 Hz modulating signal in closed-loop configuration.
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