基于前馈自抗扰的光伏微电网混合储能控制策略

针对光伏微电网混合储能系统中储能设备间的功率分频分配有效性差和抗干扰能力较弱等问题,提出一种基于前馈自抗扰控制(feedforward linear active disturbance rejection control,FF-LADRC)的光伏微电网混合储能控制策略。首先,搭建混合储能系统中蓄电池和超级电容的双向DC-DC数学模型,通过在电压环控制中引入前馈自抗扰控制,以提高混合储能系统的动态响应速度和抗干扰性能,并通过设置低通滤波,进而实现不同储能设备之间的功率分频分配。同时,将线性自抗扰控制分别引入蓄电池电流环控制和超级电容电流环控制,以实现不同储能设备间的协调控制,进而提高并网侧功率稳定性。频域分析结果证明了所提控制策略的有效性和稳定性。仿真结果表明,所提控制策略能够快速进行功率分频分配,同时协调光伏微电网有效运行。

Control Strategy of Hybrid Energy Storage for Photovolatic Microgrid Applying Feedforward Active Disturbance Rejection

Aiming at the problems of poor efficiency and weak anti-interference ability of energy-storage devices in the hybrid energy storage system of photovoltaic microgrid, this paper proposes an energy storage control strategy for hybrid photovoltaic microgrid applying the technology of feedforward linear active disturbance rejection control (FF-LADRC). Firstly, a bi-directional DC-DC mathematical model of the battery and super capacitor in the hybrid energy storage system is built. By introducing feedforward active disturbance control in the voltage loop control, the dynamic response speed and anti-jamming performance of the hybrid energy storage system are improved. A low-pass filter is set up to achieve power frequency division between different energy storage devices. At the same time, linear active disturbance rejection control is introduced into battery current loop and super capacitor current loop control to achieve coordinated control between different energy storage devices, thereby improving the power stability of the grid-connected side. The results of frequency domain analysis prove the effectiveness and stability of the proposed control strategy. The simulation results show that the proposed control strategy can quickly perform power frequency division distribution and coordinate the effective operation of the photovoltaic microgrid.