Ivan Andrade

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Predictive control of a multi-drive solar pumping system

2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe), 2019

In this paper, a multiple drives solar-pumping system is presented. The system is based on a sing... more In this paper, a multiple drives solar-pumping system is presented. The system is based on a single-stage photovoltaic (PV) topology where an array of solar panels is connected to multiple inverters supplying equal centrifugal pumps. The inverters are operated to extract the maximum power from the PV system and a predictive control strategy for the machines currents is proposed. The performance of the system is verified via simulations.

Control of an asymmetric alternate arm converter for HVDC

2017 CHILEAN Conference on Electrical, Electronics Engineering, Information and Communication Technologies (CHILECON), 2017

The Modular Multilevel Converter (MMC) has become the choice topology for integration of renewabl... more The Modular Multilevel Converter (MMC) has become the choice topology for integration of renewable energy power plants into the grid, through submarine HVDC cables and HVDC lines. Nevertheless, the MMC requires significant large DC storage capacitors to mitigate for the large power pulsations that result from the single-phase like AC to DC conversion process that takes place in the arms. This work addresses a converter topology which uses modular multilevel arms only on the lower side of the MMC converter whereas the upper side uses only standard ON-OFF valves. This corresponds to a limit case of the Alternate Arm Converter (AAC) with no module on the upper side and no director switch on the lower side, i.e. an Asymmetrical ACC. Like the AAC, the Asymmetric AAC offers a significant reduction in DC energy storage requirements. In addition, the Asymmetric AAC offers a less restricted operation than the AAC, in terms of operating over a wide range of AC to DC voltage ratio, and the pos...

Droop Control Strategy for Voltage Source Converters Containing Renewable Power Sources

This paper presents a strategy to control the active and reactive power in the point of common co... more This paper presents a strategy to control the active and reactive power in the point of common connection (PCC) of a wind generation system operating in islanded mode. A full back-to-back voltage source converter (VSC) is connected between each wind generator and the PCC. The control scheme considers voltage and frequency regulation for each VSC. The voltage and frequency references are obtained from P-V and Q-f droop characteristics of the generators, where Q and P are the reactive and active power supplied by each VSC to the PCC. Proportional-integral (PI) controllers process the voltage and frequency errors and set reference currents (in d-q frame) to be imposed by the converter. The strategy has been validated by mean of simulations, and results are presented showing the performance of the control strategy proposed.

An HVDC inverter based on the Asymmetric Alternate Arm Converter with thyristor valves

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society, 2021

The current research expounds numerical investigation of key parameters effects, namely porosity ... more The current research expounds numerical investigation of key parameters effects, namely porosity (H 0.4, 0.6, 0.7 and 0.8), Reynolds number (Re = 100, 200, 400 and 600) and Eckert number (Ec= 0, 1, 5 and 10) on the forced convective laminar flow and heat transfer through a horizontal porous channel filled with a metal foam structure impregnated with paraffin as a phase change material (PCM). The Darcy-Brinkman-Forchheimer model under the local thermal non-equilibrium (LTNE) condition is deemed at the representative elementary volume (REV) scale. The fully coupled equations of Navier-Stokes, Poisson's equation, energy equations, and continuity equation were handled numerically via a thermal single relaxation time lattice Boltzmann method (TSRT-LBM). To facilitate implementation, all LB equations are based on the same speed discretization scheme (D2Q9). Three-population distribution functions were applied to simulate the fluid flow, and temperatures of the fluid and solid phases. Previously, the numerical model was validated by available cases. Then, a comprehensive investigation has been performed to investigate the influence of the aforementioned dimensionless numbers. All LBM results are found to be highly consistent with other numerical works. The outcomes reported that at lower porosities, the energy and exergy efficiencies increased with increasing Re and Ec. However, for large porosity values, the efficiencies were optimum for a critical Re ~ 400. To sum up, it can be stated that the implemented thermal lattice Boltzmann method has been demonstrated as a suitable approach study the thermal sensible energy storage.

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Alternate Arm Converter with Thyristor-based Director Switches

2018 IEEE International Conference on Automation/XXIII Congress of the Chilean Association of Automatic Control (ICA-ACCA), 2018

The Modular Multilevel Converter (MMC) is the choice topology for integration of renewable energy... more The Modular Multilevel Converter (MMC) is the choice topology for integration of renewable energy power plants into the grid, through submarine HVDC cables and HVDC lines. Notwithstanding, the MMC requires significant large DC storage capacitors to mitigate for the large power pulsations that result from the single-phase AC to DC conversion process in their arms. The Alternate Arm Converter (AAC), which combines MMC arms with conventional valves (Director Switch), has the potential to cut the number of modules to half of that of the conventional MMC. Further, it is capable of blocking DC faults, an appealing feature for future DC networks. However, the AAC incurs higher power losses than conventional MMC. This work proposes the use of thyristors, instead of IGBTs, to implement the DSs of the AAC. This reduces conduction losses in DSs by approximately a half and makes the AAC more comparable to the conventional MMC, in terms of power losses, but with the advantage of reduced DC energy storage requirements. The principle of operation of the AAC, considering thyristor based DSs, is revisited here and a suitable control strategy to demonstrate its basic operation is developed. Proposals are verified through simulation studies using a switching converter model. Results confirm feasibility of proposed thyristor based DS and good performance of the proposed AAC.

An Active/Reactive Power Control Strategy for Renewable Generation Systems

Electronics, 2021

The development of distributed generation, mainly based on renewable energies, requires the desig... more The development of distributed generation, mainly based on renewable energies, requires the design of control strategies to allow the regulation of electrical variables, such as power, voltage (V), and frequency (f), and the coordination of multiple generation units in microgrids or islanded systems. This paper presents a strategy to control the active and reactive power flow in the Point of Common Connection (PCC) of a renewable generation system operating in islanded mode. Voltage Source Converters (VSCs) are connected between individual generation units and the PCC to control the voltage and frequency. The voltage and frequency reference values are obtained from the P–V and Q–f droop characteristics curves, where P and Q are the active and reactive power supplied to the load, respectively. Proportional–Integral (PI) controllers process the voltage and frequency errors and set the reference currents (in the dq frame) to be imposed by each VSC. Simulation results considering high-p...

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Power control of a grid-connected PV system during asymmetrical voltage faults

Electrical Engineering, 2019

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Active and reactive power control during unbalanced grid voltage in PV systems

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society, 2016

This paper presents a control strategy for a grid connected photovoltaic (PV) system aiming to re... more This paper presents a control strategy for a grid connected photovoltaic (PV) system aiming to regulate the active and reactive power injected to the electric system during asymmetrical voltage faults. The active power reference is obtained from a Maximum Power Point Tracking (MPPT) algorithm. The proposed control strategy generates the required reference currents to be imposed by the grid-tied inverter from the desired active and reactive power and the measured supply voltage. The scheme is validated for a single stage PV system where the inverter currents are regulated via predictive control. Results showing the performance of the strategy are presented during unbalanced voltage sags and swells.

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A DC-DC Converter Based On Modified Flyback Converter Topology

IEEE Latin America Transactions, 2016

This paper proposes a DC-DC power converter topology based on a modified Flyback Converter (FC). ... more This paper proposes a DC-DC power converter topology based on a modified Flyback Converter (FC). The aim of the proposed topology is to increase the voltage gain by connecting the inputs of N isolated FCs in parallel and the N secondary inductances in series. This scheme reduces the current in each switch then reducing the associated losses. A single diode and an output capacitance complete the power converter circuit. A Proportional+Integral (PI) controller is used to control the output voltage with the converter operating in discontinuous current mode. The proposed converter can handle more power than the standard FC with a low number of active power devices. The system is modeled using PSIM platform and experimental results are presented considering a 1kW prototype.

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Modulation strategies for an open-end winding induction machine fed by a two-output indirect matrix converter

Mathematics and Computers in Simulation, 2016

(2016) Modulation strategies for an open-end winding induction machine fed by a two-output indire... more

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Power control of an AFE rectifier during unbalanced grid voltage using predictive current control

2015 IEEE 24th International Symposium on Industrial Electronics (ISIE), 2015

This paper presents a predictive current control strategy for Active Front End (AFE) rectifier su... more This paper presents a predictive current control strategy for Active Front End (AFE) rectifier supplying active and reactive power to the electric system during unsymmetrical voltage fault conditions without the use of a Phase Locked Loop (PLL) or Frequency Locked Loop (FLL). For a given active and reactive power and supply voltage, the strategy generates the required reference currents. A predictive current control strategy is used to impose those currents by the AFE rectifier. It is shown that the amount of active and reactive power that can be injected into the grid will depend on voltage unbalanced level. Simulations and experimental results showing the performance of the strategy are presented during unbalanced voltage sag and swells.

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Predictive control of a multi-drive solar pumping system

2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe), 2019

Control of an asymmetric alternate arm converter for HVDC

2017 CHILEAN Conference on Electrical, Electronics Engineering, Information and Communication Technologies (CHILECON), 2017

Droop Control Strategy for Voltage Source Converters Containing Renewable Power Sources

An HVDC inverter based on the Asymmetric Alternate Arm Converter with thyristor valves

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society, 2021

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Alternate Arm Converter with Thyristor-based Director Switches

2018 IEEE International Conference on Automation/XXIII Congress of the Chilean Association of Automatic Control (ICA-ACCA), 2018

An Active/Reactive Power Control Strategy for Renewable Generation Systems

Electronics, 2021

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Power control of a grid-connected PV system during asymmetrical voltage faults

Electrical Engineering, 2019

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Active and reactive power control during unbalanced grid voltage in PV systems

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society, 2016

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A DC-DC Converter Based On Modified Flyback Converter Topology

IEEE Latin America Transactions, 2016

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Modulation strategies for an open-end winding induction machine fed by a two-output indirect matrix converter

Mathematics and Computers in Simulation, 2016

(2016) Modulation strategies for an open-end winding induction machine fed by a two-output indire... more

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Power control of an AFE rectifier during unbalanced grid voltage using predictive current control

2015 IEEE 24th International Symposium on Industrial Electronics (ISIE), 2015

Cartel de São Paulo

Sala Preta, 2005

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