基于分数阶滑模的混合微电网接口变换器电压稳定控制

Voltage Stability Control of Interface Converter in Hybrid Microgrid Based on Fractional-order Sliding Mode

针对并网型交直流混合微电网直流侧母线电压波动问题,提出一种基于分数阶滑模控制的交直流混合微电网互联接口变换器电压稳定控制策略。首先,基于交直流混合微电网互联接口变换器的数学模型,设计控制参数并推导出可控标准型状态空间表达式。然后,针对控制目标选取状态变量并设计电压变结构和电流分数阶滑模控制器。最后,通过MATLAB/Simulink仿真和RT-LAB半实物平台验证了该控制策略与传统PI控制、传统单环滑模控制相比具有更好的追踪性能及鲁棒性。

Aimed at the problem of DC-side bus voltage fluctuations in grid-connected AC/DC hybrid microgrid,a voltage stability control strategy for interlinking interface converter(IIC)in AC/DC hybrid microgrid based on fractional-order sliding mode control is proposed.First,based on the mathematical model of IIC in AC/DC hybrid microgrid,the control parameters are designed,and the controllable standard state space expression is derived.Then,the state variables are selected for the control target,and a voltage variable structure sliding mode controller and a current fractional-order sliding mode controller are designed,respectively.Finally,through the MATLAB/Simulink simulations and RT-LAB semi-physical platform,it is verified that compared with the traditional PI control and single-loop sliding mode control,the proposed control strategy has a better tracking performance and a better robustness.