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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2021, Vol. 55 Issue (7): 1279-1288    DOI: 10.3785/j.issn.1008-973X.2021.07.007
    
Linear active disturbance rejection control with adjustable compensation factor applied for outer voltage control of inverter
Yang LI(),Rong QI*(),Ming-guang DAI
School of Automation, Northwestern Polytechnical University, Xi’an 710129, China
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Abstract  

In order to improve the transient performance of the microgrid inverter output voltage under reference voltage changes and load disturbances, a linear active disturbance rejection control (LADRC) strategy was proposed, in which the compensation factor was regarded as an adjustable parameter. The inverter model in the synchronous rotating frame was established, and the second-order LADRC with the output voltage as the state variable was designed under the proportional regulator in the current loop. The influence of the compensation factor on the system stability, dynamic performance, and anti-disturbance ability were analyzed by the root locus and frequency domain characteristics respectively, which provided a theoretical basis for the adjustment of compensation factor. On this basis, the design process of the control parameters in the LADRC and current regulator was given, and the compared simulation and experiment was carried out. Simulation analysis and experimental results show that by appropriately reducing the compensation factor, the voltage response speed can be accelerated, the overshoot can be reduced, and the system's anti-load disturbance ability can be improved.

Key words： microgrid inverter      linear active disturbance rejection control (LADRC)      compensation factor      root locus      frequency domain characteristics      anti-load disturbance     
Received: 20 May 2020      Published: 05 July 2021
CLC:  TM 464  
Fund:  陕西省重点研发计划资助项目（2018ZDCXL-GY-05-07-01）
Corresponding Authors: Rong QI     E-mail: liyangxgd@163.com;lhqr@nwpu.edu.cn
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Yang LI
Rong QI
Ming-guang DAI
Cite this article:

Yang LI,Rong QI,Ming-guang DAI. Linear active disturbance rejection control with adjustable compensation factor applied for outer voltage control of inverter. Journal of ZheJiang University (Engineering Science), 2021, 55(7): 1279-1288.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.07.007     OR     https://www.zjujournals.com/eng/Y2021/V55/I7/1279


补偿因子可调逆变器电压外环线性自抗扰控制

为了提高微电网逆变器在参考电压变化和负载扰动下输出电压的暂态性能，提出将补偿因子视为可调参数的线性自抗扰控制（LADRC）策略. 通过建立同步旋转坐标系下的微电网逆变器模型，结合电流环比例调节器，设计以输出电压为状态变量的二阶LADRC；利用根轨迹和频域特性曲线分析补偿因子对系统稳定性、动态性能和抗干扰能力的影响，为补偿因子的调节提供理论依据；在此基础上给出LADRC和电流调节器控制参数的设计过程；并进行对比仿真和实验. 仿真分析和实验结果表明：通过适当减小补偿因子可以加快电压响应速度，减小超调，提高系统抗负载扰动能力.


关键词： 微电网逆变器,  线性自抗扰控制（LADRC）,  补偿因子,  根轨迹,  频域特性,  抗负载扰动 
Fig.1 Overall control structure of microgrid inverter
Fig.2 Dual closed-loop voltage controller structure
Fig.3 Structure of second order LADRC
Fig.4 Simplified structure of second order LADRC
Fig.5 Root locus of the system
ωc/（rad·s?1） ωo/ωc ωo/（rad·s?1） ρ
2094 2 4188 0.247~4.10
2094 5 10470 0.195~5.87
2094 8 16752 0.171~7.87
Tab.1 Stable range of ρ under different ωc and ωo
Fig.6 Frequency domain characteristics of transfer function under disturbance
参数 符号 数值 单位
直流电压 Vdc 300 V
滤波电感 Ls 3 mH
等效串联电阻 Rs 0.16 Ω
开关频率 fsw 10 kHz
死区时间 Td 2.6 μs
滤波电容 Cf 4.7 μF
线电压有效值 Vrms 154.3 V
额定频率 fn 50 Hz
采样频率 fs 10 kHz
电流环系数 Kpi 18.85
控制器带宽 ωc 2 094 rad/s
观测器带宽 ωo 6 283 rad/s
Tab.2 Parameters in the simulation and experiment
Fig.7 Simulation results of voltage tracking under different compensation factors
Fig.8 Simulation results of load disturbance under different compensation factors
Fig.9 Three-phase microgrid inverters experimental platform
Fig.10 Output voltage of inverter after reference changed
Fig.11 Changes of output voltage amplitude after reference changed
Fig.12 Output voltage of inverter after load switching
Fig.13 Changes of output voltage amplitude after load switching
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