船舶并联气电混合动力系统动态特性研究与能量效率分析

Dynamic Characteristics Research and Energy Efficiency Analysis of Marine Parallel Gas-Electric Hybrid Power System

关键词:  天然气发动机  混合动力  船舶  动态特性  能量效率

Key words:  Natural gas engine  Hybrid power  Marine  Dynamic characteristics  Energy efficiency

摘要:

针对天然气发动机单独使用动力性能较差、动态响应较慢的缺陷问题，提出新型船舶并联气电混合动力系统解决方案，通过电机快速响应特性来提升船舶动力整体效率；设计相关试验，利用上升时间、峰值时间和超调量三个参数对新型动力系统的动态特性进行定量分析，研究不同工况下能量效率提升程度和最优工作模式。研究表明：可逆电机的加入将船舶混合推进系统的动态响应上升时间缩短至1/10，峰值时间缩短至1/2，超调量稳定在5.5%；充分说明可逆电机有效弥补天然气发动机的动态响应差的问题，进一步验证新型动力系统的可行性和有效性；通过能效分析给出不同工况下的最优工作模式，为能量匹配优化、能量管理策略设计等提供理论支撑。

Abstract:

The solution of the new marine parallel gas-electric hybrid power system was proposed for the defects of poor power and slow dynamic response of natural gas engines alone. The overall efficiency of ship power was enhanced by the rapid response characteristics of the motor. The dynamic characteristics of the new power system were quantitatively analyzed by design-related tests using the three parameters of rising time， peak time and overshoot. The degree of energy efficiency improvement and the optimal working mode were studied under different operating conditions. The results show that the rise time of dynamic response of marine hybrid propulsion system can be reduced to 1/10 with the addition of a reversible motor. The peak time is shortened to 1/2. The overshoot is stable at 5.5%. It fully shows that the reversible motor can effectively make up for the poor dynamic response of natural gas engine and further verifies the feasibility and effectiveness of the new hybrid power system. Through energy efficiency analysis， the optimal working mode under different working conditions is obtained. It provides theoretical support for energy matching optimization and energy management strategy design.