Abstract
A new controlling method of three level inverters is proposed in this paper. Three-level T inverters are widely used in industry for high-power, medium-voltage power conversion and drives. Topics related to power losses due to commutation and quality of the output current is relevant issues in this power range. The neutral-point balancing problem in this topology is another subject that has been studied in recent years. Among the most common control methods for this converter, the literature states are non linear techniques, like hysteresis control, and linear methods, like the use of PI controllers in conjunction with pulse width modulation. The general predictive control scheme is applied here to the inverter. The behavior of the system is predicted for each possible switching state of this kind of inverter. The switching state that minimizes a given cost function is selected to be applied during the next sampling interval following the same strategy.
Highlights
The three-level T-type inverter has been proposed for high-efficiency systems in low-voltage applications such as photovoltaic (PV) inverter, power factor corrector (PFC) rectifier, and automotive inverter systems [1]
The finite control-set model predictive control (FCS-MPC) is a class of controllers that are most suitable for the power electronic converters.This controller is intuitive, easy to implement and it can be applied to variety of systems with easy inclusion of constraints and/or nonlinearities
The predictive current control method presented does not require any kind of linear controller or modulation technique
Summary
The three-level T-type inverter has been proposed for high-efficiency systems in low-voltage applications such as photovoltaic (PV) inverter, power factor corrector (PFC) rectifier, and automotive inverter systems [1]. The neutral-point clamped (NPC) inverter uses the two switches connected in series to block the full dc-link voltage. The total losses in a T-type inverter are the lowest among those of the two-level, NPC, and T-type inverters in medium switching frequencies (4–30 kHz) The finite control-set model predictive control (FCS-MPC) is a class of controllers that are most suitable for the power electronic converters.This controller is intuitive, easy to implement and it can be applied to variety of systems with easy inclusion of constraints and/or nonlinearities. A discrete-time model of the load is needed to predict the behaviour of the variables evaluated by the cost function, that is, the grid currents
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