充电模式下飞轮储能单元的协调无源控制器设计

Design of a coordinated control unit for the charge process of a flywheel energy storage unit based on passivity and backstepping methods

针对非线性因素在飞轮储能单元之中产生的不利影响,文章基于双输入的飞轮储能系统提出了一种分步设计方法;通过Backstepping控制和无源性设计思想的有效结合,使系统转速和电流达到稳定输出。首先,基于双输入飞轮储能单元的充电模型,由Backstepping方法设计飞轮储能系统的q轴控制器;再者,利用协调无源性设计系统的d轴控制器,使得整个系统达到反馈无源,保证了系统的渐近稳定性。整个设计过程没有采用任何线性化处理,保证了整个控制律在非线性系统中的适用性,有效地提高了系统的稳定性能。通过仿真结果的对比可知,所提控制策略的有效性和正确性。

A step-by-step design method based on dual-input is proposed to address issues associated with non-linear factors in the control of a flywheel energy storage unit. This was based on an effective combination of the Backstepping control and passivity methods, enabling the flywheel system speed and current output stabilized. First, the Backstepping method was used to design the q-axis controller of the flywheel during charge. The d-axis controller of the system was designed by coordinating the passivity, making the whole system passive and hence ensuing the asymptotic stability of the system. The whole design process did not use any linearization treatment, ensuring the applicability of the whole control model in the non-linear system and hence an improved stability performance of the system. Simulations were then performed and the results validated the proposed control strategy.