Abstract
This paper proposes a balanced current control strategy for the current source rectifier (CSR) stage of an indirect matrix converter (IMC) under unbalanced grid voltage conditions. If the three-phase grid connected to the voltage source inverter (VSI) of the IMC has unbalanced voltage conditions, it affects the currents of the CSR stage and VSI stage, and the currents are distorted. Above all, the distorted currents of the CSR stage cause instability in the overall system, which can affect the life span of the system. Therefore, in this paper, a control strategy for balanced currents in the CSR stage is proposed. To achieve balanced currents in the CSR stage, the VSI stage should receive DC power without ripple components from the CSR stage. This is implemented by controlling the currents in the VSI stage. Therefore, the proposed control strategy decouples the positive and negative phase-sequence components existing in the unbalanced voltages and currents of the VSI stage. Using the proposed control strategy under unbalanced grid voltage conditions, the stability and life span of the overall system can be improved. The effectiveness of the proposed control strategy is verified by simulation and experimental results.
Highlights
AC-AC power conversion systems are widely used in various applications such as renewable energy conversion systems, adjustable speed drives, and AC-AC transmission [1,2,3,4,5]
This paper proposed a control strategy for balanced currents of the current source rectifier (CSR) stage in an indirect matrix converter (IMC)
Unlike other researches, which dealt with modulation strategies under unbalanced voltage conditions of the three-phase grid connected to the CSR stage and, this paper dealt the control strategy under unbalanced voltage conditions of the three-phase grid connected to the voltage source inverter (VSI) stage
Summary
AC-AC power conversion systems are widely used in various applications such as renewable energy conversion systems, adjustable speed drives, and AC-AC transmission [1,2,3,4,5]. A power conversion three-phase grid has unbalanced voltage conditions, the input and output currents are affected by such as a B2B converter or an IMC. If the of three-phase output stages increase the torque ripple of the generator in the GS and degrade the power quality of has unbalanced voltage conditions, the input and output currents are affected by the unbalanced grid the grid This results in the instability of the overall system, and affects the life span of the system. Distortion of the VSI to calculate new reference currents for balanced input currents, and the power quality of the grid can currents caused by the unbalanced voltage conditions decreases because of the proposed be improved using the proposed control strategy. The suitable operation and effectiveness of the proposed control strategy is demonstrated by simulation and experimental results
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