一种适用于新能源船舶的多功能并网逆变器

Multi-functional grid-connected inverter suitable for new energy ship

船舶电网电能质量不仅会影响设备的使用效率和可靠性,还会降低船舶运行的经济性和安全裕度,甚至威胁到船舶的安全性。随着船舶新能源技术的不断发展,各种新能源在船舶平台上的使用也给船舶电网电能质量带来一些新问题。文章分析了船舶电网电能质量的三个重要影响因素。基于改进型i_p-i_q法的谐波无功检测的思想,提出一种多功能并网逆变器控制策略——既能够充分利用逆变器的剩余容量,在完成并网的同时,还能够提供无功补偿、谐波抑制等多目标控制的一体化装置,对船舶电网电能质量进行分散式补偿和控制,不仅有效提高逆变器的利用效益,还节省宝贵的船舶空间,降低投资成本。该控制策略省去了低通滤波器,提高检测速度和精度,能在无中性线的船舶三相三线制系统中无需改变传统逆变器拓扑结构便能实现不平衡电流的补偿,最后通过仿真验证了该方法的正确性和有效性。

The power quality of the ship electric network will affect the efficiency and reliability of the equipment, and reduce the economy and safety margin of the ship operation, as well as seriously threaten the ship safety. With the increasing development of the new marine energy, the application of the new energy on ships brings out new problems of power quality. This paper analyzes the three important factors that affect the power quality of the ship electric network , including the harmonic wave produced by the distributed power, the fluctuation of voltage and frequency, and the network fault. Based on the modified ip-iq harmonic reactive power detection method, it proposes a multi-functional grid-connected inverter control strategy, which can fully utilize the residual capacity of the inverter. While the grid connection is completed, it can provide the multi-objective control integrated devices, such as the reactive power compensation and harmonic suppression, for the distributed compensation and control of the power quality of the ship electric network. It can also improve the availability of the inverter, save the valuable ship space and reduce the investment cost. This control strategy eliminates the low-pass filter, and improves the detection speed and accuracy. Moreover, the unbalanced current compensation can be realized without changing the traditional inverter topology in a marine three-phase three-wire system without neutral line. Finally, the correctness and effectiveness of this method are validated by simulation.