Abstract
Conventional single-phase Vienna rectifiers employ proportional-integral (PI) controllers which are appropriate for controlling DC components, to regulate their line currents. However, in the regions close to the line current’s zero-crossing point, the dynamics of PI controllers are too slow to respond to the reference current, which has an AC component. Hence, the power factor (PF) of the device is degenerated, and total harmonic distortion (THD) increases. A controller with a fast dynamic response is thus required to solve this problem. In this paper, we investigate the use of a model-based predictive controller (MPC), which has a faster dynamic response than a PI controller, to improve the line current quality of a single-phase Vienna rectifier. With this method, the average current in both the continuous current mode (CCM) and the discontinuous current mode (DCM) of operation are controlled using a mode detection method. Moreover, we calculate the optimized duty cycle for the single-phase Vienna rectifier, by predicting the next current state. We verify the operation of the proposed algorithm using a PSIM simulation, and a practical experiment conducted with a 1-kW-rated single-phase Vienna rectifier prototype. With the proposed method, the quality of the line current near the zero-crossing point is improved, and the PF is controlled to unity.
Highlights
There has been a growing interest in eco-friendly electric vehicle (EV) systems, because of the depletion of fossil-fuels, and in order to reduce greenhouse gas emissions [1]
We propose a model-based predictive control algorithm for a single-phase Vienna rectifier, to to improve improve the the quality quality of of its its line line current
The optimal duty cycle for discontinuous current mode (DCM) operation can be deduced by applying a similar method to that used for continuous current mode (CCM)
Summary
There has been a growing interest in eco-friendly electric vehicle (EV) systems, because of the depletion of fossil-fuels, and in order to reduce greenhouse gas emissions [1]. Vienna rectifiers apply apply proportional-integral (PI) controllers to the line current control control loop.devices. These devices are optimized for regulating andcomponents not AC components [17],dynamic as their loop. We propose a model-based predictive control algorithm for a single-phase Vienna rectifier, to to improve improve the the quality quality of of its its line line current. Different optimized duty cycles for controlling the line current in CCM adopted. Different optimized duty cycles for controlling the line current in CCM and DCM are and DCMIn arespite deduced. Spite of this, the algorithm is capable ofthe controlling the current, average even line current, deduced.
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