Browsing by Author "Ibanez-Hidalgo, Irati"
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Item DC-Link Neutral Point Control for 3L-NPC Converters Utilizing Selective Harmonic Elimination-PWM(2022-09-01) Sanchez-Ruiz, Alain; Mazuela, Mikel; Fernandez-Rebolleda, Hector; Ceballos, Salvador; Perez-Basante, Angel; Ibanez-Hidalgo, Irati; Zubiaga, Markel; Pou, Josep; Beniwal, Neha; Konstantinou, Georgios; POWER ELECTRONICS AND SYSTEM EQUIPMENTSelective harmonic elimination-pulsewidth modulation (SHE-PWM) is a modulation technique widely used to improve the efficiency and harmonic content in medium-voltage high-power converters. Among these converters, the three-level neutral-point-clamped (3L-NPC) converter is one of the most utilized topologies. However, the 3L-NPC converter requires a proper balancing of dc-link capacitor voltages. This article presents a control technique, based on pulse shifting method, to regulate the neutral point voltage when SHE-PWM is utilized. The proposed technique performs well with any power factor and it can also be directly applied to T-type converters and easily extrapolated to other multilevel topologies. The proposed method is experimentally validated in a scaled-down power converter and a full-scale medium-voltage 3L-NPC converter.Item Error Tolerance Analysis for SHE-PWM Calculation in a 3L-NPC Converter(IEEE Computer Society, 2021-10-13) Ibanez-Hidalgo, Irati; Sanchez-Ruiz, Alain; Perez-Basante, Angel; Ceballos, Salvador; Zubizarreta, Asier; Li, Yunwei; Quan, Zhongyi; POWER ELECTRONICS AND SYSTEM EQUIPMENTMedium-voltage high-power converters are usually modulated using low switching frequency techniques such as Selective Harmonic Elimination-Pulse Width Modulation (SHE-PWM) in order to improve their efficiency. To calculate the firing angles, SHE-PWM transcendental equations are usually solved by offline calculation methods, whose computational burden depends on the number of firing angles or eliminated harmonics and the required accuracy in the solutions. Consequently, with the aim of reducing this computational burden, this paper presents an analysis that estimates the maximum accuracy required in the calculated SHE-PWM solutions considering the main non-idealities of the converter. In this sense, a systematic methodology to evaluate the error in the harmonic amplitudes due to control and dead time effects has been developed, providing an optimal error tolerance for the calculation methods that solve the SHE-PWM problem.Item Methodology to Compare Meta-heuristic Algorithms to Solve Selective Harmonic Elimination-PWM and Optimal Pulse Pattern Formulations(IEEE Computer Society, 2021-10-13) Ibanez-Hidalgo, Irati; Oregi, Izaskun; Gil-Lopez, Sergio; Perez-Basante, Angel; Sanchez-Ruiz, Alain; Pujana, Ainhoa; Zubizarreta, Asier; Ceballos, Salvador; POWER ELECTRONICS AND SYSTEM EQUIPMENT; Quantum; IA; DIGITAL ENERGYLow switching frequency modulation techniques such as Selective Harmonic Elimination-Pulse Width Modulation (SHE-PWM) or Optimal Pulse Pattern (OPP) are commonly used in medium voltage-high power multilevel converters to improve their efficiency. These techniques require solving non-linear equations in order to calculate the firing angles. These equations can be solved by meta-heuristic optimization algorithms, which depend on a set of hyperparameters that must be properly adjusted to ensure their effectiveness. This paper presents a methodology to tune different meta-heuristic algorithms to fairly compare them and select the best algorithm to solve SHE-PWM/OPP formulation. The methodology is applied considering different meta-heuristic algorithms such as genetic algorithm, differential evolution, harmony search and simulated annealing. It has been validated in SHE-PWM and OPP techniques with different number of firing angles.Item Real Time Selective Harmonic Control - PWM Based on Artificial Neural Networks(2024-01-01) Ibanez-Hidalgo, Irati; Sanchez-Ruiz, Alain; Perez-Basante, Angel; Zubizarreta, Asier; Ceballos, Salvador; Gil-Lopez, Sergio; Aguilera, Ricardo P.; POWER ELECTRONICS AND SYSTEM EQUIPMENT; IASelective harmonic elimination-pulse width modulation (SHE-PWM) is a widely used low switching frequency modulation technique for medium-voltage high-power converters. This approach is able to adjust the converter fundamental component while eliminating low-order harmonics. However, some applications such as active power filters (APFs) require regulating simultaneously, both the fundamental and low-order harmonics in amplitude and phase. This article presents a novel selective harmonic control-PWM (SHC-PWM) modulator, valid for APFs, based on artificial neural networks (ANNs) and sequential quadratic programming (SQP). A new offline search methodology, based on a hybrid metaheuristic-numerical algorithm, is defined to calculate the solution space when both the fundamental and a low-order harmonic are controlled in phase and amplitude. The solutions obtained are used to train the ANNs offline. Afterwards, the ANN + SQP calculation method is used to solve the SHC-PWM problem in real-time (RT). Experimental results are provided for a three-level converter to verify the effectiveness of the proposed RT control method.