Multivariable Deadbeat Control of Power Electronics Converters with Fast Dynamic Response and Fixed Switching Frequency

Abstract

Power converters have turned into a critical and every-day solution for electric power systems. In fact, the incorporation of renewable energies has led towards the constant improvement of power converter topologies and their controls. In this context, over the last 10 years, model predictive control (MPC) is positioned as one the most studied and promising alternatives for power converter control. In voltage source inverters (VSI), MPC has only been applied in the inner current control loop, accelerating and improving its dynamic response, but as mentioned, has been limited only to the current control loop. The fastest of the MPC techniques is the Deadbeat (DB) control, and in this paper, it is proposed to employ DB control on the entire system, therefore accelerating the time response not only for the current loops, but also for voltage loops. At the same time, this avoids overshoots and overpower in order to protect the power converter, leading to the fastest dynamic response according to VSI capabilities. For renewable energies, fast-dynamics entails fast maximum power tracking and therefore, maximizes energy harvesting, or in other words, reduces the losses due to the control dynamics. Thus, this paper gives a clear procedure and key points for designing a DB control for all the variables based on a mathematical model, which is corroborated by simulations and the experimental results.

A review on the state of the art of dynamic voltage restorer: topologies, operational modes, compensation methods, and control algorithms

“…As a result, many strategies have been devised utilizing the deadbeat control method, i.e., a method with a computational delay for quick system response, but it lacks the potential to handle dynamic response of other variables. A strategy for multi-loop response employing conventional state feedback linearization has developed for voltage and current management of the system [139].…”

Deadbeat Current Control in Grid-Connected Inverters: A Comprehensive Discussion

“…However, this method needs to be investigated further using a higher-order output filter to achieve a better output current. In [56], the authors proposed a multivariable deadbeat control of power electronics converters with fast dynamic response and fixed switching frequency, This research work employed DBC for the entire system, therefore accelerating the time response not only for the current loops, but also for voltage loops. Good results were obtained based on simulation from this research.…”