基于有限时间观测器的光储系统母线电压互补滑模控制

Finite-time Observer-based Sliding Mode Control of Bus Voltage Complementarity in Optical Storage Systems

针对光储直流微网混合储能系统易受能源间歇性输入、负载随机性扰动以及功率流向切换等干扰,会造成母线电压波动、系统功率失稳等问题,提出一种基于有限时间观测器的互补滑模控制(FTESO+CSMC)策略.首先,根据混合储能元件的高低频特性,对系统差额功率进行电流等效分配.然后,设计有限时间扩张状态观测器,对系统受到的总扰动进行观测,并将扰动观测值作为前馈项输入互补滑模控制器中,对系统扰动进行补偿,保证系统状态在有限时间内达到收敛,提高了系统的快速性和抗扰性,并根据Lyapunov理论证明了控制系统的稳定性.最后,基于MATLAB仿真平台,对多种模拟工况进行仿真,仿真结果表明,相较于传统控制策略,本文所提控制具有更快的响应速度以及更好的抗扰性能.

In view of the fact that the hybrid energy storage systems of optical storage and DC microgrids are susceptible to intermittent energy input,random load perturbations,and power flow switching,which may cause the problems of bus voltage fluctuations and system power instability,a complementary sliding mode control strategy based on a finite-time observer is proposed.First,according to the high-low frequency characteristics of the hybrid energy storage elements,the current equivalent distribution of the system differential power is carried out.Then,a finite-time dilated state observer is designed to observe the total disturbance to the system,and the disturbance observations are fed into the complementary sliding-mode controller as feedforward terms to compensate for the system disturbance,ensuring that the system state reaches convergence in finite time,improving the fast and anti-disturbance performance of the system,and proving the stability of the control system according to Lyapunov theory.Finally,based on the MATLAB simulation platform,the simulation results show that the proposed control has faster response speed and better immunity to disturbances than the traditional control strategy.