Abstract
Current-source converter (CSC) is more attractive and increasingly used to occasions with higher requirements for reliability due to inherent anti-short circuit ability. This paper combines the CSC with DC/DC converter to adapt to lower input voltage applications. However, rational allocation of the duty cycle for each switch to achieve the target voltage output and the increase of overall switching times brought by DC/DC converter are major problems. Proposed coordinated control strategy can reasonably take full advantage of degrees of freedom based on the adjustment variable to achieve accurately control of grid-side current and load voltage. In addition, dc-link current pulses according to 6 times grid angular frequency which avoids using the zero-vector to reduce the switching times. Experimental results show the proposed scheme can not only guarantees the power quality at grid side and precise voltage output, but also avoids using zero-vector.
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