Decentralised Optimal Controller Design of Variable Frequency Three-Phase Power Electronic Networks Accounting for Sub-System Interactions

Dewar, David; Rohten, Jaime; Formentini, Andrea; Zanchetta, Pericle

doi:10.1109/ojia.2020.3044810

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…In converter control applications, MPC controllers solve an optimization problem every sampling period for determining the best switching sequence of the converter [4]. Compared to applications with a lower sampling frequency [7,8], MPC for power converters require a high computational load, which often results in tradeoffs when designing the optimization problem [9]. The controller can be implemented using either a continuous control set (CCS) or a finite control set (FCS).…”

Section: Introductionmentioning

confidence: 99%

Impact of Linear-PWM and MPC controllers on the power device losses in a grid-tied two-level inverter

Gonzalez

Pérez-Estévez

et al. 2021

2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)

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This paper presents a comparative analysis of the estimated power losses and device junction temperatures in a two-level grid-tied converter commanded by a linear current controller with a pulsewith-modulator (PWM) or a finite-control-set (FCS) model predictive controller (MPC). This analysis is performed for two points of operation: (a) converter delivering only active power to the grid, (b) exchanging capacitive-reactive power with the grid (STATCOM). Using an electrothermal model based on the firing signals and measured converter currents, the simulation results show the important role of the operating point and control methodology of the converter losses and device junction temperature excursions. The results show that using the MPC controller improves the converter performance when the converter delivers only active power to the grid. In the case of STATCOM operation the total losses are similar, but there is a relative increase of the losses on the diodes. The use of SiC Schottky diodes has been evaluated, with an improvement of the converter performance for both controllers.

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Section: Introductionmentioning

confidence: 99%

Impact of Linear-PWM and MPC controllers on the power device losses in a grid-tied two-level inverter

Gonzalez

Pérez-Estévez

et al. 2021

2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)

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A Model Predictive Current Controller With Improved Robustness Against Measurement Noise and Plant Model Variations

Pérez-Estévez

Doval-Gandoy

2021

IEEE Open J. Ind. Applicat.

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This article improves the robustness of a finite control set (FCS)-model predictive controller (MPC) for grid-tied inverters and motor drives applications to plant parameter variations and noise, without reducing its bandwidth or affecting its excellent transient response to disturbances and reference commands. The proposed modification adds an observer to the MPC controller structure, which does not significantly increase the computational burden on the embedded controller. Traditionally, observers are employed to estimate unmeasured variables and cancel the effect of disturbances, but this article employs the observer to estimate a measured variable, the converter output current. This solution leverages the benefits of observers from linear controller theory in order to remove undesired components in the measured current and improve the robustness of the controller; hence it is a valuable solution for practicing power-electronic engineers and researchers in the field of grid-tied inverters and motor drives due to its simplicity compared to some advanced techniques often required in more complex MPC designs. Index Terms-Current controller, L filter, finite control set (FCS) model predictive controller (MPC), voltage source converter (VSC), inverter, observer.

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Stability Analysis of Two Power Converters Control Algorithms Connected to Micro-Grids with Wide Frequency Variation

Rohten

Villarroel

Pulido

et al. 2022

Sensors

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Distributed power generation, micro-grids, and networks working in islanding mode have strong deviations in voltage quantities. These deviations can be divided into amplitude and frequency. Amplitude deviations are well-known and studied, as they are common in small and big grids. However, deviations on the ac mains frequency have not been widely studied. The literature shows control schemes capable of bearing these variations, but no systematic analysis has been performed to ensure stability. As the majority of power converters are designed for big grids, their analysis and design neglect frequency disturbances, therefore those devices allow a very small frequency operating window. For instance, in power converters that need to be synchronized to the grid, the standard deviation does not go beyond 0.5 Hz, and for grid-tied inverters it does not go beyond 1 Hz, whereas variations of around 8 Hz can be expected in micro-grids. This work presents a comprehensive analysis of the control system’s stability, where two different control schemes for a back-to-back static converter topology are implemented and studied under a wide variable grid frequency. Because the behavior of power converters is nonlinear and coupled, dynamic and static decouplers are usually introduced in the controller, being a key element on the scheme according to the findings. The results show that using just a static decoupler does not guarantee stability under frequency variations; meanwhile, when a dynamic decoupler is used, the operating window can be greatly extended. The procedure shown in this paper can also be extended to other control algorithms, making it possible to carefully choose the control system for a variable frequency condition. Simulated and experimental results confirm the theoretical approach.

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Decentralised Optimal Controller Design of Variable Frequency Three-Phase Power Electronic Networks Accounting for Sub-System Interactions

Cited by 3 publications

References 34 publications

Impact of Linear-PWM and MPC controllers on the power device losses in a grid-tied two-level inverter

Impact of Linear-PWM and MPC controllers on the power device losses in a grid-tied two-level inverter

A Model Predictive Current Controller With Improved Robustness Against Measurement Noise and Plant Model Variations

Stability Analysis of Two Power Converters Control Algorithms Connected to Micro-Grids with Wide Frequency Variation

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