基于协同控制的串联超级电容电压均衡策略

超级电容作为储能式轻轨的动力源,其性能非常重要,为此提出一种分布式协同控制策略来实现串联超级电容的电压均衡.在信息层将串联超级电容单体视为智能体,均压问题可建模成多智能体系统协同跟踪问题;将串联超级电容单体之间分散的通信网络利用有向图来描述;借助有界的S型饱和函数,基于最近邻原则,设计了有界的控制增益可调节的协同均压控制律;在假定有向图含有生成树的前提下,利用李亚谱诺夫函数,结合拉塞尔不变集原则,证明了整个闭环系统的渐近稳定性;利用仿真验证了所提出的协同控制策略的有效性和可行性.

Voltage equalization strategy for series-connected ultracapacitors based on cooperative control

This paper proposes a distributed cooperative control strategy to balance the voltages of the series-connected ultracapacitors which are the power supply of energy storage light rail vehicles, and their performance is of great significant. Taking each ultracapacitor cell as an agent in the cyber layer, the voltage equalization problem can be formulated as the cooperative tracking problem of multi-agent systems. The sparse communication network among the series-connected ultracapacitors can be modeled by a directed graph. Based on the nearest neighborhood rule, a bounded distributed control law is designed with the aid of a S-like saturation function and the control gains can be tuned according to the system performance. Assuming that the digraph has a directed spanning tree, the asymptotically stability of the overall close-loop system is rigorously proved by the Lyapunov function integrating the Lasalle invariant principle. Simulations verify the effectiveness and feasibility of the proposed cooperative control strategy.