直流组网船舶供电变流器运行与控制策略研究

Research on the Operation and Control Strategy of Onboard Power Supply Converter in DC-grid Hybrid Ship

通过采用电力电子变换技术和储能技术,直流组网电力推进系统成为混合动力船舶提高燃油效率、减少碳排放及增强冗余性能的最佳选择。文章介绍了直流组网型混合动力船舶推进变流系统的构成及其工作原理。针对其日用负载供电变流器的多运行模式及其控制策略,提出一种基于正、负dq同步旋转坐标系的分序控制方法,以保证三相供电变流器带单相负荷时输出电压的平衡;并通过坐标变换构造负序指令,从而无须依赖数字低通滤波器。仿真和实验结果显示,对比传统的单独正序控制,采用该控制策略后,正序、负序分序控制电压波形不平衡度由12%降为小于0.5%,验证了所提控制策略的正确性和有效性。

Through power electric converter and energy storage technology,DC-grid hybrid propulsion plants are becoming an optimal alternative for hybrid ship to improve fuel efficiency,reduce emissions as well as enhance redundancy.This paper introduces the basic structure and operation principle of electric propulsion converter system for a DC-grid hybrid ship.Aiming at multi-operation-mode and control strategy of the onboard daily load power supply converter,a method of positive and negative sequence-dividing control under dq synchronous rotating coordinate is proposed which can ensure that output voltage of the three-phase power supply converter is balanced even with single-phase load,the negative sequence reference is constructed through coordinate transformation without digital low-pass filter.Simulation and experimental results show that compared with the traditional single positive sequence control,the unbalance of the positive and negative sequence-dividing control waveform is from 12%to less than 0.5%,which verifies the correctness and effectiveness of the proposed control strategy.