模型信息联合校正型自抗扰控制策略

MODEL INFORMATION COMBINED CORRECTION ACTIVE DISTURBANCE REJECTION VOLTAGE STABILIZING CONTROL STRATEGY

为解决微电网受到不确定扰动时,会对直-直变换器输出的电能质量产生严重影响的问题,该文提出一种模型信息联合校正型自抗扰控制技术(ADRC-MIR)。在该控制策略中,首先借助串联超前校正的思想,以比例微分校正环节对线性扩张状态观测器的扰动观测传递函数进行修正,使其可实现对总和扰动更精确的跟踪;然后,根据状态空间平均法从被控系统中提取部分模型信息,将其写入修正后的线性扩张状态观测器的系数矩阵并最终构建出ADRC-MIR;随后基于理论推导,给出改进控制器的参数整定公式及其物理意义,并从噪声抑制、扰动抑制及其频域特性等方面指出改进后的控制器可提升控制品质的原因。最后通过对比不同工况下的数值仿真验证所提控制策略的可行性与正确性。

In order to solve the problem that the uncertain disturbance of microgrid will seriously affect the output power quality of direct-to-direct converter,this paper proposes an active disturbance rejection control technology based on joint correction of model information(ADRC-MIR).In this control strategy,the disturbance observation transfer function of the linear extended state observer is modified by proportional differential correction based on the idea of series advance correction,so that the total disturbance can be tracked more accurately.Then,part of the model information is extracted from the controlled system according to the state space average method,and written into the coefficient matrix of the modified linear expanded state observer,and finally ADRC-MIR is constructed.Then,based on the theoretical derivation,the parameter setting formula of the improved controller and its physical significance are given,and the reason why the improved controller can improve the control quality is pointed out from the aspects of noise suppression,disturbance suppression and frequency domain characteristics.Finally,the feasibility and correctness of the proposed control strategy are verified by comparing the numerical simulation under different working conditions.