一种基于双环LADRC的混合储能变换器控制方法

A control method for hybrid energy storage converter based on dual⁃loop LADRC

混合储能变换器可以帮助提升光伏发电系统的动态响应能力和稳定性,但传统线性控制器在执行双向DC-DC变换器控制时表现不足。针对直流母线电压易受变换器非线性噪声、光伏输出功率和负载扰动影响的问题,设计了一种基于双环LADRC的混合储能变换器控制策略。通过分析混合储能变换器主电路的工作原理,建立了主电路的扰动模型。基于扰动模型完成了对电压-电流双环LADRC控制器的设计,并结合功率分频实现了混合储能变换器的整体控制策略。仿真结果表明,与传统比例积分控制器相比,基于双环LADRC的混合储能变换器控制策略使母线电压幅值波动减小了39.4%,调节时间减少了25.0%,在功率响应和直流母线电压支撑方面表现出优越的动态响应和抗扰能力。

Hybrid energy storage converter can help improve the dynamic response and stability of photovoltaic power generation system,but traditional linear controllers are inadequate when performing the control of bidirectional DC-DC converters.Aiming at the problem that DC bus voltage is easily affected by nonlinear noise of the converter,photovoltaic output power and load disturbance,a hybrid energy storage converter control strategy based on dual⁃loop LADRC is designed.By analyzing the working principle of the main circuit of the hybrid energy storage converter,the disturbance model of the main circuit is established.Based on the disturbance model,the voltage⁃current dual⁃loop LADRC controller is designed,and the overall control strategy of the hybrid energy storage converter is realized by combining power frequency division.The simulation results show that the control strategy of hybrid energy storage converter based on dual⁃loop LADRC reduces the amplitude fluctuation of bus voltage by 39.4%and the adjustment time by 25.0%compared with the traditional proportional integral controller.It shows superior dynamic response and anti⁃interference ability in power response and DC bus voltage support.