T型三电平储能变流器直流母线电压改进自抗扰控制  

DC bus voltage improved active disturbance rejection control of a T-type three-level energy storage converter

作　　者：周杰 皇金锋[1] 黄红杰 王嘉力 傅作超 ZHOU Jie;HUANG Jinfeng;HUANG Hongjie;WANG Jiali;FU Zuochao(School of Electrical Engineering,Shaanxi University of Technology,Hanzhong 723001,China;Xi’an Xingyuan Bo Rui New Energy Technology Co.,Ltd.,Xi’an 710000,China)

机构地区：[1]陕西理工大学电气工程学院,陕西汉中723001 [2]西安星源博锐新能源技术有限公司,陕西西安710000

出　　处：《电力系统保护与控制》2024年第21期81-91,共11页Power System Protection and Control

基　　金：陕西省自然科学研究项目资助(2023-JC-YB-442)。

摘　　要：针对T型三电平储能变流器在受到扰动时直流母线电压容易波动的问题,提出了一种改进的线性自抗扰控制(linear active disturbance rejection control,LADRC)方法以增强直流母线电压的控制稳定性。该方法对线性扩张状态观测器(linear extended state observer,LESO)进行了改进。首先,引入总扰动微分状态变量以提升扰动观测能力。其次,对观测器进行降阶处理,一方面降低观测器设计复杂度,另一方面降低相位滞后,提升扰动估计速度。最后,在总扰动通道上增加一个滞后补偿环节减弱噪声放大影响。通过上述改进实现了对系统总扰动的精确快速估计。基于频域分析,得出改进后的LADRC相比传统LADRC具有更优秀的抗扰性能。多组实验结果均表明,与PI控制和传统LADRC相比,在有功功率突变、无功功率突变以及电网电压跌落情况下,所提控制策略的直流母线电压超调量更小,暂态时间更短,验证了所提方法的有效性,保证了储能变流器的正常平稳运行。To address the issue of DC bus voltage fluctuation in a T-type three-level power conversion system when subjected to disturbance,an improved linear active disturbance rejection control(LADRC)method is proposed to enhance the control stability.This method improves the linear extended state observer(LESO)by first introducing a total disturbance differential state variable to enhance disturbance observation capability.Secondly,the observer is reduced to reduce both design complexity and phase lag,thereby improving disturbance estimation speed.Finally,a lag compensation loop is added on the total disturbance channel to attenuate noise amplification effects,achieving accurate and fast estimation of system total disturbances.Based on frequency domain analysis,it is found that the improved LADRC has better disturbance rejection performance than traditional LADRC.Multiple sets of experimental results demonstrate that compared with PI control and traditional LADRC,this strategy exhibits smaller overshoot and shorter transient time for DC bus voltage during active power transients,reactive power transients,and grid voltage drops.This validates the effectiveness of the proposed method and ensures normal and stable operation of the energy storage converter.

关 键 词：T型三电平储能变流器 母线电压波动 自抗扰控制 观测器 频域分析 

分 类 号：TM46[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]