直流微网母线电压纹波集中补偿自寻优策略

为抑制直流微网母线电压二次纹波,文中提出了一种直流有源滤波器集中补偿自寻优策略。在双向DC/DC变换器电压/电流双闭环控制的基础上,加入直流母线电压纹波控制,通过引入带通滤波器消除了传统控制方法中采用低通滤波器提取纹波时所产生的相位滞后问题。采用迭代自寻优方法获取重要控制参数阻抗系数K,实现直流有源滤波器对直流母线电压纹波变化的实时跟踪和集中补偿。在MATLAB/Simulink中搭建了含互联接口变流器、分布式电源、直流负荷、由DC/AC变流器接入的交流负荷以及直流有源滤波器的直流微网模型,建立了相应的实验平台。仿真和实验结果均验证了所提控制策略的有效性。

Centralized Compensation Self-Optimization Strategy of Bus Voltage Ripple in DC Microgrid

In order to suppress the secondary ripple of DC microgrid bus voltage, a centralized compensation self-optimization strategy of DC active power filter is proposed in this study. Based on the voltage/current double closed-loop control of bi-directional DC/DC converter, the DC bus voltage ripple control is added. A band-pass filter is introduced to eliminate the phase lag problem when the low-pass filter is used to extract the ripple in the traditional control method. The impedance coefficient K which is an important control parameter, is obtained by iterative self-optimization method to realize the real-time tracking and centralized compensation of DC bus voltage ripple by DC active power filter. In MATLAB/Simulink, simulation model of DC microgrid including an interlinking converter, two distributed generations, a DC load, a single-phase AC load and a DC-APF is built, and the corresponding experimental platform is established. Simulation and experimental results validate the effectiveness of the proposed control strategy.