一种双电船舶混合发电单元的有限时间控制器设计

超级电容/锂动力双电船舶中存在着众多级联的电力电子装置和闭环控制的负载变换器，它们都可被视为恒功率负载，其负阻抗特性会放大系统的不稳定，甚至导致整个系统无法正常工作。针对这一问题，提出一种新型有限时间控制器。首先，构建双电船舶直流电力推进系统的数学模型，介绍用于混合发电单元的比例/积分下垂控制。然后，基于有限时间控制理论设计了含双曲正切函数的新型有限时间控制器，通过所设计的有限时间观测器对各类扰动进行观测，并由控制器进行补偿。最后，搭建仿真模型及实验平台，其结果表明，所提控制器可以在保证混合发电单元对母线电压波动分频响应的同时，提高系统带恒功率负载时的大信号稳定性。

A finite-time controller design for a dual-electric ship hybrid power generation unit

There are many cascaded power electronic devices and closed-loop control load converters in supercapacitor/lithium powered ships. They can all be regarded as constant power load (CPL). Their negative impedance characteristics will amplify the instability of the system and even make the entire system unable to work normally. To solve the problem, this paper proposes a novel finite-time controller. First, a mathematical model of the dual-electric ship''s DC electric propulsion system is constructed and the proportional/integral droop control method for hybrid power generation units is introduced. Then, based on finite-time control theory, a new finite-time controller with hyperbolic tangent function is designed, in which various disturbances are observed through the designed finite-time observer, and compensated for by the controller. Finally, simulation models and experimental platforms are built. Their results show that the proposed controller can improve the large-signal stability of the system with CPL while ensuring the frequency division response of the hybrid power generation unit to bus voltage fluctuations. This work is supported by the National Natural Science Foundation of China (No. 51709028 and No. 51979021).