Papers by Ricardo P . Aguilera
2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia), May 15, 2022
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IEEE Transactions on Power Electronics, Sep 1, 2019
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IEEE open journal of the Industrial Electronics Society, 2023
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IEEE Transactions on Industrial Electronics, 2023
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IEEE Transactions on Power Electronics, 2023
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IEEE Transactions on Industrial Electronics, 2021
Cascaded H-bridge (CHB) converters are attractive candidates for next generation photovoltaic (PV... more Cascaded H-bridge (CHB) converters are attractive candidates for next generation photovoltaic (PV) inverters. CHB converters present a reduced voltage stress per power switch and a high modularity. Therefore, the plant can be divided in several PV strings that can be connected to each H-bridge cell. However, due to variability on solar irradiance conditions, each PV string may present different maximum available power levels, which difficult the overall converter operation. To address this issue, this article presents a model predictive control (MPC) strategy, which works along with a phase-shifted pulsewidth modulation (PS-PWM) stage; hence, its name phase-shifted MPC (PS-MPC). The novelty of this proposal is the way both interbridge and interphase power imbalance are directly considered into the optimal control problem by a suitable system reference design. Thus, the interphase imbalance power is tackled by enforcing the converter to operate with a proper zero-sequence voltage component. Then, by exploiting the PS-PWM working principle, PS-MPC is able to handle each H-bridge cell independently. This allows the predictive controller to also deal with an interbridge power imbalance using the same control structure. Experimental results on a 3-kW prototype are provided to verify the effectiveness of the proposed PS-MPC strategy.
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IEEE Transactions on Power Electronics, 2021
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IEEE Transactions on Power Electronics, 2021
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IEEE Journal of Emerging and Selected Topics in Power Electronics, 2021
Common-ground (CG) string inverters with a transformerless (TL) circuit configuration have been b... more Common-ground (CG) string inverters with a transformerless (TL) circuit configuration have been broadly popular in grid-connected photovoltaic (PV) applications. The most important feature of a PV string TL inverter with a CG circuit connection is the elimination of leakage current concerns. Having the voltage boosting property within a single power processing stage can also be propitious to further facilitate the integration of low-scale PV string panels with higher efficiency. An efficient topology of such converters is presented in this study, which is able to produce a five-level stair-case output voltage waveform using an integrated switched-boost (SB) cell with only seven power switches. The proposed SB common grounded five-level (SBCG5L)-TL inverter can also be extended for the three-phase CG-based applications with the contribution of the same integrated SB cell. As for the single-phase configuration, it needs two dc-link capacitors and two power diodes along with two small inductors. A quasi-soft charging operation of the involved capacitors is also achieved. To control the injected current under the grid-connected condition, a single-step model predictive control (MPC) technique with a fixed switching frequency operation has also been presented. The proposed circuit description, the theoretical analysis of the applied MPC principles, and the comparative study with associated experimental results are also presented to ascertain the correctness and feasibility of the proposed SBCG5L-TL inverter.
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IEEE Transactions on Industrial Electronics, 2019
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IEEE Transactions on Power Electronics, 2019
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2018 IEEE 27th International Symposium on Industrial Electronics (ISIE), 2018
This paper proposes a sequential Phase-Shifted Model Predictive Control (PS-MPC) strategy for thr... more This paper proposes a sequential Phase-Shifted Model Predictive Control (PS-MPC) strategy for three-level Active Neutral Point Clamped (3L-ANPC) converter. The proposed predictive control strategy is formulated to fully exploit a phase-shifted pulse width modulation (PS-PWM) stage. By means of an appropriate choice of synchronized average models for each carrier, the proposed predictive controller obtains independent optimal duty cycles for each carrier in a sequential manner. This allows one to formulate the optimal control problem not only to govern the output current but also to balance the dc-link capacitor voltages, similarly to the finite-control-set MPC (FCS-MPC) case. As evidenced by the simulation results, the 3L-ANPC converter governed by the proposed sequential PS-MPC can attain a faster dc-link voltage balancing dynamic when compared to a standard PS-PWM implementation. Moreover, it generates an output voltage with fix-spectrum in the steady state with a constant commutation rate and evenly distributed power losses, which outperforms a standard FCS-MPC strategy.
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Studies in computational intelligence, 2014
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This paper proposes a sequential Phase-Shifted Model Predictive Control (PS-MPC) strategy for a s... more This paper proposes a sequential Phase-Shifted Model Predictive Control (PS-MPC) strategy for a single-phase five-level H-bridge flying capacitor converter. The optimal control problem is formulated to regulate the output current and both of the internal floating capacitor voltages. The proposed sequential PS-MPC strategy achieves a fixed switching frequency, which is beneficial in terms semiconductor loss distribution, and also to ensure that a high-bandwidth is achieved that compares favorably to the finite-control-set MPC (FCS-MPC) case. Simulation results of the proposed sequential PS-MPC strategy, providing current tracking control for a passive load, are presented to verify the transient and steady-state performance that can be achieved.
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2017 20th International Conference on Electrical Machines and Systems (ICEMS)
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IEEE Journal of Emerging and Selected Topics in Power Electronics, 2022
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2021 31st Australasian Universities Power Engineering Conference (AUPEC), 2021
Several battery balancing strategies have been reviewed in this work, along with their benefits a... more Several battery balancing strategies have been reviewed in this work, along with their benefits and drawbacks. Dissipative, non-dissipative, and hybrid techniques are the most common. It has been highlighted how they have been compared to one another. A detailed comparative view of battery balancing topologies of equalizers has been performed by a tree diagram associated with a comparison table. After that, equalizers are also classed according to their control methods.
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2017 20th International Conference on Electrical Machines and Systems (ICEMS), 2017
The combination of residential photovoltaic (PV) panels and battery energy storage system (BESS) ... more The combination of residential photovoltaic (PV) panels and battery energy storage system (BESS) is a promising solution in a building's microgrid. This paper presents an optimal energy management system (EMS) to minimize the electricity bill of residential buildings. The objective is to achieve peak shaving and electrical energy cost minimization for the owner, making use of a dynamic energy pricing model. Due to variability of PV generation and limitations of BESS, the optimization method should account for the utilisation of PV power generation and the conversion losses of power electronics converters. To deal with non-linearities involved, a particle swarm optimization (PSO) algorithm has been developed for minimization of the cost function. Simulation results show that the PSO-based EMS can achieve, as compared to standard schedule for a 24 hour period, a significant saving of daily electricity cost, which prompts for a suitable on-line control strategy.
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2019 IEEE International Conference on Industrial Technology (ICIT), 2019
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2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia), 2021
Model predictive control (MPC) has emerged as a promising approach to govern modular multilevel c... more Model predictive control (MPC) has emerged as a promising approach to govern modular multilevel converters (MMCs) due to its flexibility to include multiple control objectives and its simple design process. However, this control scheme presents relevant issues, such as high computational complexity and the proper references design requirement. This work proposes a phase-shifted model predictive control (PS-MPC) for MMCs with an optimal circulating currents reference governor based on a quadratic programming MPC (QP-MPC). The PS-MPC is formulated to fully exploit a phase-shifted pulsewidth modulation technique by obtaining independent optimal modulating signals for each carrier sequentially, with reduced computational effort independent of the number of submodules. Moreover, the proposed QP-MPC reference governor improves the overall dynamic performance of the MMC and brings flexibility for prioritizing the capacitor voltage ripples reduction or the MMC efficiency by changing the weighting factors of its cost function. Simulation results are provided to verify the proposed control scheme’s effectiveness when governing a three-phase MMC with four half-bridges per arm.
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Papers by Ricardo P . Aguilera