Abstract
This paper proposes grid voltage sensorless model predictive control for a single-phase T-type rectifier with an active power decoupling circuit. The proposed sensorless technique is based on a model reference adaptive system (MRAS) and tested under distorted grid conditions. This study also examines the relationship among the ripple energy, the dc-link capacitor, and the active power decoupling circuit capacitor. The developed control technique is proposed to ensure the following objectives; (1) sensorless grid voltage estimation; (2) the second-order ripple power elimination; (3) reference current generation based on power equilibrium; (4) ensuring unity power factor under all operating conditions; and (5) capacitor voltage balance. The developed control structure offers simplicity and it is cost-effective due to the absence of a grid voltage sensor. An experimental prototype is established, and the main results, including the steady-state and dynamic performances, are presented to validate the effectiveness of the proposed control.
Highlights
In the last few decades, there has been a dramatic increase in using pulse-width modulated (PWM) rectifiers in single-phase systems as they play a pivotal role in various applications e.g., battery chargers, uninterruptible power supply (UPS), and light-emitting-diodes (LED)
The proposed control technique consists of four main parts, including sensorless grid voltage estimation, reference current generation based on power equilibrium, model predictive control (MPC) for the main converter, and MPC for the power decoupling circuit based on instantaneous ripple power control
In (31), the grid voltage Vs is estimated from (29), the dc-link voltage Vdc is measured by the voltage sensor, and the internal resistance rs value can be identified by LC meter
Summary
In the last few decades, there has been a dramatic increase in using pulse-width modulated (PWM) rectifiers in single-phase systems as they play a pivotal role in various applications e.g., battery chargers, uninterruptible power supply (UPS), and light-emitting-diodes (LED). The control system of T-type single-phase PWM rectifier requires one grid voltage sensor, one line current sensor, and two voltage sensors for the dc-link capacitors [13]. These sensors are relatively expensive compared to the total cost of the control system and decrease the system reliability. The MPC based control technique is proposed to regulate the line current as well as the dc-link voltage of the single-phase NPC rectifier [24].
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