Abstract
Several control strategies have been proposed with the aim to get a desired behavior in the power converter variables. The most employed control techniques are linear control, nonlinear control based on linear and nonlinear feedback, and predictive control. The controllers associated with linear and nonlinear algorithms usually have a fixed switching frequency, featuring a defined spectrum given by the pulse width modulation (PWM) or space vector modulation (SVM) time period. On the other hand, finite set model predictive control (FS-MPC) is known to present a variable switching frequency that results too high for high power applications, increasing losses, reducing the switches lifetime and, therefore, limiting its application. This paper proposes a predictive control approach using a very low sampling frequency, allowing the use of predictive control in high power applications. The proposed method is straightforward to understand, is simple to implement, and can be computed with off-the-shelf digital systems. The main advantage of the proposed control algorithm comes from the combination of the model predictive control and the SVM technique, drawing the principal benefits of both methods. The provided experimental results are satisfactory, displaying the nature of space vector-based schemes but at the same time the fast response as expected in predictive control.
Highlights
Controlled power converters have achieved important acceptance to manage voltages and currents
To address the aforementioned problem, and based on the principle of deadbeat control [26], this paper proposes a model predictive controller in combination with an space vector modulation (SVM) technique applied to an active front-end rectifier (AFE) achieving reduced switching and sampling frequencies (Figure 1)
The results show that the model predictive control (MPC) proposal based on the dead-beat control principle in combination with SVM has a good behavior suitable for high-power applications under low switching frequency
Summary
Controlled power converters have achieved important acceptance to manage voltages and currents. (iii) STATCOMs to reduce the harmonic distortion and increase the power; (iv) inverters in general as active front end rectifier (AFE), neutral point clamped (NPC), etc., to transform dc to ac energy, used in photovoltaic farms, and motor drives applications [7,8,9]. These topologies have become popular, with the increment of renewable energy penetration into the power grid, which requires more reliable and robust system control in order to maintain the power injection to the distribution grid. The pulses are selected to reach a given reference through the minimization of a cost function, obtaining a fast dynamic response [3], but with a variable switching frequency
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