直流微网变增益专家自抗扰控制

直流微网在分布式发电的有效利用中发挥重大作用。为解决直流微网中存在的实时扰动影响双向DC-DC变换器控制效果从而恶化电能质量的问题，提出了一种变增益专家自抗扰稳压控制。首先，在状态观测器理论下设计专家系统，将其与扩张状态观测器有机结合，并且引入动态调节因子实现观测器增益的在线优化。其次，利用系统在抗扰过程中的观测绝对误差与控制强度需求制定专家规则与变增益自抗扰控制策略，给出动态调节因子取值范围。并且在观测跟踪性能、抗扰频域特性、噪声抑制、时变增益对系统抗扰性的影响等方面进行了理论分析，表明所提出的控制策略能够有效提升系统性能。最后，经过仿真和实验验证，使用变增益专家自抗扰控制在多种工况下的性能均优于传统双闭环PI与LADRC控制。

Expert system-changeable gain ADRC for a DC microgrid

The DC microgrid plays an important role in the effective utilization of distributed generation. To solve the problem that the real-time disturbance in a DC microgrid affects the control of the bidirectional DC-DC converter and worsens power quality, an expert system-changeable gain active disturbance rejection voltage stabilization control is proposed. First, the expert system is designed using state observer theory, and is organical combined with the ESO. A dynamic adjustment factor is introduced to realize the online optimization of the observer gain. Second, expert rules and changeable gain active disturbance rejection control strategies are formulated based on the observation absolute observation error and control strength demand of the system in the process of anti-interference, and the value range of the dynamic adjustment factor is given. In addition, the effects of observation tracking performance, disturbance rejection frequency domain characteristics, noise suppression and time varying gain on system immunily are analyzed theoretically. The analysis shows that the proposed control strategy can effectively improve the performance of the system. Finally, the simulation and physical experiment results show that the performance of ES-CGADRC is better than that of traditional double closed-loop PI and LADRC control in a variety of conditions.