Examinando por Autor "Arau, Jaime"

Mostrando 1 - 3 de 3

Asynchronous and Decoupled HIL Simulation of a DC Nanogrid
(MDPI, 2022-06-29) Estrada, Leonel; Vaquero López, Joaquín; Rodríguez Lorente, Alba; Arau, Jaime; de Castro, Ángel; Sánchez, Alberto; Vazquez, Nimrod
In this paper, an asynchronous and decoupled Hardware-In-the-Loop simulation of a DC nanogrid is presented. The DC nanogrid is a recent way to solve problems presented in traditional power generation, such as low efficiency, pollution, and cost increase. The complexity of this kind of system is high due to the interconnection of all the composing elements, making the use of HIL simulation attractive due to its advantages regarding computational power and low solution time. However, when a nanogrid is simulated in commercial and personalized platforms, all the elements presented are solved at the same integration time, even if some elements could be solved at smaller integration times, causing a slowdown of the system solution. The results of the asynchronous HIL simulation are compared with a synchronous HIL simulation with an integration time of 425 ns, and also with an offline simulation performed in PSIM software. The proposal achieves an integration time of 200 ns for the fastest element and 425 ns for the slowest, with an error of less than 0.2 A for current signals and less than 2 V for voltage signals. These results prove that the asynchronous and decoupled solution of an HIL simulation for nanogrid is possible, allowing each element to be solved as fast as possible without affecting the accuracy of the result, as well as simplifying programming.
Finite Control Set – Model Predictive Control Based On Sliding Mode For Bidirectional Power Inverter
(IEEE, 2021-12) Estrada, Leonel; Vázquez, Nimrod; Vaquero López, Joaquín; Hernández, Claudia; Arau, Jaime; Huerta, Héctor
This paper presents a different Finite Control Set – Model Predictive Control (FCS-MPC) for grid-connected threephase bidirectional power inverters. These are typically used in dc or ac renewable-based microgrids (MGs), where bidirectional operation and fast dynamic response is required. The bidirectional grid-connected inverters are an essential part of MG, which inject energy into the ac grid or demand energy from it. The dynamic behavior of the system is a major concern since the current can suddenly change depending on the hierarchical controller. This paper proposes a different cost function using sliding mode theory, which offers a good dynamic response, reduced computational burden, and a parameter-free control model. The operation principle of the proposed controller is given and evaluated using a Hardware-In-the-Loop (HIL) system, but also experimentally with a 1kW laboratory prototype. The final results demonstrate the advantages of using this approach in grid-connected three-phase bidirectional power inverters in terms of dynamic response and reduced computational burden, making this solution technically attractive and viable.
Real-Time Hardware in the Loop Simulation Methodology for Power Converters Using LabVIEW FPGA
(MDPI, 2020-01-07) Estrada, Leonel; Vázquez, Nimrod; Vaquero López, Joaquín; de Castro, Ángel; Arau, Jaime
Nowadays, the use of the hardware in the loop (HIL) simulation has gained popularity among researchers all over the world. One of its main applications is the simulation of power electronics converters. However, the equipment designed for this purpose is di cult to acquire for some universities or research centers, so ad-hoc solutions for the implementation of HIL simulation in low-cost hardware for power electronics converters is a novel research topic. However, the information regarding implementation is written at a high technical level and in a specific language that is not easy for non-expert users to understand. In this paper, a systematic methodology using LabVIEW software (LabVIEW 2018) for HIL simulation is shown. A fast and easy implementation of power converter topologies is obtained by means of the di erential equations that define each state of the power converter. Five simple steps are considered: designing the converter, modeling the converter, solving the model using a numerical method, programming an o -line simulation of the model using fixed-point representation, and implementing the solution of the model in a Field-Programmable Gate Array (FPGA). This methodology is intended for people with no experience in the use of languages as Very High-Speed Integrated Circuit Hardware Description Language (VHDL) for Real-Time Simulation (RTS) and HIL simulation. In order to prove the methodology’s e ectiveness and easiness, two converters were simulated—a buck converter and a three-phase Voltage Source Inverter (VSI)—and compared with the simulation of commercial software (PSIM® v9.0) and a real power converter.