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JPE, Vol. 19, No. 2, March 2019
Research on Carried-Based PWM with Zero-Sequence Component Injection for Vienna Type Rectifiers
Hui Ma, Mao Feng, Yu Tian, and Xi Chen
Area Analysis, Modeling and Control
Abstract This paper studies the inherent relationship between currents and zero-sequence components. Then a precise algorithm is proposed to calculate the injected zero-sequence component to control the DC-Link neutral-point voltage balance, which can result in a more efficient and flexible neutral point voltage balance with a desirable performance. In addition, it is shown that carried-based PWM with the calculated zero-sequence component scheme can be equivalent to space-vector pulse-width modulation (SVPWM). Based on the proposed method, the optimal zero-sequence component of the feasible modulation indices is analyzed. In addition, the unbalanced load limitation of the DC-Link neutral-point voltage balance control is also revealed. Simulation and experimental results are shown to verify the validity and practicality of the proposed algorithm.
Keyword DC-link neutral-point voltage balance,Carried-based PWM,Vienna-type rectifier,Zero-sequence component
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