基于自抗扰控制的直流微电网双向Buck-Boost变换器控制策略研究
摘要：为了降低直流微电网母线电压的波动，提出基于自抗扰控制的双向Buck-Boost变换器控制策略。运用直流母线电压外环、直流变换器电感电流内环的控制方法实现直流微电网与储能系统之间的能量双向流动。进一步提出基于扩张状态观测器观测输出总扰动，包括负载电流和母线电压的变化，在负载扰动电流影响系统的直流母线电压最终输出前，主动从外环被控对象的输入信号电感电流或输出信号母线电压中提取扰动信息，然后尽快用控制信号将其消除，从而大大降低其对被控量的影响，以有效抑制暂态直流母线的电压波动和冲击，在母线电压产生波动时能够快速恢复到正常的工作状态。仿真验证表明：储能系统可以通过控制策略实现能量的双向传递，并且当母线产生功率波动和电流冲击时，储能系统可以使直流母线电压稳定，提高了系统的可靠性。
Abstract:In order to reduce the fluctuation of DC microgrid bus voltage, a bidirectional Buck-Boost converter control strategy based on active disturbance rejection control (ADRC) was proposed. The control method of DC bus voltage outer loop and DC converter inductance current inner loop was used to realize the bidirectional flow of energy between the DC microgrid and the energy storage system. It was further proposed to observe the total output disturbance based on the extended state observer (ESO), including the change of load current and bus voltage. Before the load disturbance current affects the final output of the DC bus voltage of the system, the disturbance information was actively extract from the input signal inductance current or the output signal bus voltage of the controlled object in the outer loop. Then, the control signal was used to eliminate the disturbance information as soon as possible, which reduces the influence on the controlled quantity, and further suppresses the voltage fluctuation and impact of the transient DC bus. Therefore, the bus voltage can quickly recover to the normal working state when the bus voltage fluctuates. The correctness of the proposed control strategy was verified by simulation. The simulation results show that the energy storage system can achieve bidirectional energy transfer through the control strategy. In addition, when the bus generates power fluctuations and current shocks, the energy storage system can stabilize the DC bus voltage and improve the system the reliability.
标题：基于自抗扰控制的直流微电网双向Buck-Boost变换器控制策略研究
title:Research on Control Strategy of Bidirectional Buck-Boost Converter in DC Microgrid Based on Active Disturbance Rejection Control
作者：卢昕, 陈众励, 李辉
authors:Xin LU, Zhongli CHEN, Hui LI
关键词：直流微电网,双向Buck-Boost变换器,母线电压波动,自抗扰控制(ADRC),
keywords:DC microgrid,bidirectional Buck-Boost converter,bus voltage fluctuation,active disturbance rejection controller (ADRC),
发表日期：2021-04-30
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