由于混合微电网中的交直流子网具有不同的动态特性,当系统发生负荷突变时,会在双向接口变换器(bidirectional interface converter,BIC)两侧子网间产生功率波动,使交流母线频率和直流母线电压动态响应变差,为此提出了基于分数阶滑模控制器(fractional order sliding mode controller,FOSMC)的双向下垂控制策略.将具有鲁棒性强、响应速度快和抗干扰能力强的滑模变结构控制引入到BIC的控制中,得到改进型的分数阶滑模控制器,以改善系统的暂态响应过程.通过Matlab/Simulink平台搭建了仿真模型,在多种工况下验证了该控制策略的有效性.与传统双向下垂控制相比,该控制算法可以在保证系统原有稳态特性的同时,加快整个系统的响应速度,抑制暂态过程中BIC传输功率的瞬间波动,减小功率波动对交直流子网母线的反作用,提高整个系统的动态性能和抗扰动性能.
Bidirectional Droop Control of Hybrid Microgrid Interface Converter Based on Sliding Mode Control
Due to the different dynamic characteristics of AC-DC subnets in hybrid microgrids,power fluctuations will occur between subnets on both sides of the bidirectional interface converter(BIC)when the system's load changes,and the dynamic response of AC bus frequency and DC bus voltage will become poor.Therefore,a bidirectional droop control strategy based on fractional order sliding mode controller(FOSMC)is proposed.By introducing the sliding mode variable structure control with strong robustness,fast response speed and strong anti-interference ability into the BIC control,an improved fraction-order sliding mode controller is obtained,which can improve the transient response process of the system.The simulation model is built by Matlab/Simulink platform,and the effectiveness of the control strategy is verified under various working conditions.Compared with the traditional bidirectional droop control,the proposed control algorithm can not only guarantee the original steady-state characteristics of the system,but also accelerate the response speed of the whole system,suppress the instantaneous fluctuation of BIC transmission power in the transient process,reduce the reaction of power fluctuation on the AC and DC subnets bus,and improve the dynamic performance and anti-disturbance performance of the whole system.
hybrid AC-DC microgridbidirectional interface converter(BIC)microgrid inertiasliding mode controlbidirectional droop control
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