基于无源性与滑模变结构的独立直流微电网控制

Control of Independent DC Micro Grid Based on Passivity and Sliding Mode Structure

针对独立直流微电网稳定性问题,提出了一种基于滑模变结构的电流无源双闭环控制策略,提高了系统的响应速度和抗干扰能力。首先,建立独立直流微电网系统数学模型,针对该模型应用无源性理论设计系统的控制输入,得到系统的端口受控耗散Hamilton(port-controlled hamiltonian with dissipation,PCH-D)模型。然后,针对系统的直流母线电压的稳定性问题,应用滑模变结构方法,当系统用电负荷、分布式能源和参数突变时,母线电压仍能稳定在其期望值上,并得到燃料电池电流的参考值。最后,通过Matlab仿真进行验证,对比本文控制策略与传统单一的无源控制策略,说明所提出的控制方法具有更好的动态特性和稳态特性。

In view of stability issue of independent DC micro grid,a kind of current passive double closed-loop control strategy based on sliding mode variable structure is proposed,which improves the response speed and anti-interference ability of the system.First,the mathematical model of the independent DC micro grid system is set up.For the model,the control input of the system is designed by passivity theory and the port-controlled dissipation Hamiltonian with distribution(PCH-D)model of the system is obtained.Then,as for the stability of DC bus voltage of the system,the sliding mode variable structure method is used.In case of sudden variation of electrical load,distributed energy and parameters,the busbar voltage can still stable at its expected value and the reference value of fuel cell current is obtained.Finally,the verification is performed through Matlab simulation.The comparison of the control strategy in this paper and the traditional single reactive power control shows that the proposed control method has better dynamic and steady-state characteristics.