With a large-scale use of high-proportion renewable energy, the impact of its volatility on load power quality has attracted attention. In this paper, a multi-port converter structure based on port interconnection is proposed. On the one hand, this structure can achieve the stability of the port voltage when renewable energy sources fluctuate. On the other hand, combined with the load control method, this structure can enhance the power quality at the load port, especially in terms of improving load imbalance and suppressing harmonics. The test results demonstrate the effectiveness of this structure in improving power quality.