Model predictive control with a fixed switching frequency for a 5-level flying capacitor converter

Abstract

This paper presents a novel finite-set model pre dictive control technique with a fixed switching frequency for a 5-level FCC converter. Standard implementations of finite-set model predictive control (FS-MPC) are typically characterised by a variable switching frequency, a high noise floor and a large voltage and current ripple. A method is proposed by selecting a fixed switching period and dividing it into smaller evaluation steps. The switching behaviour is obtained by using the analogy of PWM with triangular carriers to define regions during which only specific switching transitions are allowed. To account for the repetitive nature of the desired switching waveform, an average receding horizon prediction method is used. An anticipated prediction is made by calculating the average value for one switching period ahead, according to the position and state in the current switching period. The control method was practically implemented and evaluated, proved to be feasible and provided satisfactory results.

Space Vector Modulation based on Model Predictive Control to Reduce Current Ripples with Subdivided Space Voltage Vectors

“…따라서 샘플링 주기 동안 스위치는 on 또는 off 상태만을 유지한다. 그 결과 낮은 스위칭 주파 수로 인해 출력 전류의 큰 리플 성분이 존재한다 [15], [16] . 높은 스위칭 주파수를 보장하여 출력의 리플 성분을 저감시키기 위해서 공간벡터변조기법(Space vector modulation, SVM)기반의 방법들이 연구되었다 [22], [23] .…”

Modulated model predictive current control of an indirect matrix converter with active damping

“…MPC is an optimization algorithm where a model of the MC system is considered in order to predict its future behavior over a horizon in time, and a sequence of future actions is then obtained by minimizing a cost function representing the desired behavior of the MC system. However due to the lack of modulation, one of the main drawbacks of MPC is that the control algorithm only selects and applies one switching state for the whole sampling instant which generates noise as well as large current and voltage ripples, the variable switching frequency leads to a spread spectrum, decreasing the performance of the system in terms of power quality [14]- [18].…”