Single-Sensor Control of LCL-Filtered Grid-Connected Inverters

被引:32
作者
Su, Mei [1 ,2 ]
Cheng, Bin [1 ,2 ]
Sun, Yao [1 ,2 ]
Tang, Zhongting [1 ,2 ]
Guo, Bin [1 ,2 ]
Yang, Yongheng [3 ]
Blaabjerg, Frede [3 ]
Wang, Hui [1 ,2 ]
机构
[1] Cent South Univ, Sch Automat, Changsha 410083, Hunan, Peoples R China
[2] Hunan Prov Key Lab Power Elect Equipment & Grid, Changsha 410083, Hunan, Peoples R China
[3] Aalborg Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark
基金
中国国家自然科学基金;
关键词
Active damping; linear quadratic regulator; multi-resonant controller; reduced-order observer; state-space control; MODEL-PREDICTIVE CONTROL; SPACE CURRENT CONTROL; PWM CONVERTERS; RESONANCE; DESIGN;
D O I
10.1109/ACCESS.2019.2906239
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Owing to the filter resonance and background harmonics, the current control for the LCL-filtered grid-connected inverter should be carefully designed to ensure stable operation. Prior-art current control methods normally require extra sensors to achieve the damping of the resonance, or sophisticated active damping should be employed. Both increase the overall system cost and complexity. In this context, an improved control strategy is proposed for LCL-filtered inverters. The proposed control method utilizes a novel reduced-order observer in a way that only one current sensor is required for stable operation (i.e., resonance and harmonics are effectively attenuated). More specifically, the reduced-order observer embeds the dynamics of the grid voltage, where the estimated grid information is used for synchronization in a phase-locked loop. The estimated state variables of the observer are then used for the controller design. Furthermore, to achieve active damping and suppress the influence of grid voltage distortions on the current quality, a multi-resonant state-space controller is proposed, where a linear quadratic regulator method is employed to obtain the optimal gain. The simulations and experimental tests are performed on a 3-kW grid-connected inverter system with an LCL filter. The results demonstrate the effectiveness of the proposed method in terms of robust active damping and strong harmonic attenuation, and thus the inverter achieves a good power quality with only one current sensor.
引用
收藏
页码:38481 / 38494
页数:14
相关论文
共 40 条
  • [1] Sensorless Current Control of Three-Phase Inverter-Based Distributed Generation
    Ahmed, Khaled H.
    Massoud, Ahmed M.
    Finney, Stephen J.
    Williams, Barry W.
    [J]. IEEE TRANSACTIONS ON POWER DELIVERY, 2009, 24 (02) : 919 - 929
  • [2] Arruda LN, 2001, IEEE IND APPLIC SOC, P2655, DOI 10.1109/IAS.2001.955993
  • [3] Step-by-Step Controller Design for LCL-Type Grid-Connected Inverter with Capacitor-Current-Feedback Active-Damping
    Bao, Chenlei
    Ruan, Xinbo
    Wang, Xuehua
    Li, Weiwei
    Pan, Donghua
    Weng, Kailei
    [J]. IEEE TRANSACTIONS ON POWER ELECTRONICS, 2014, 29 (03) : 1239 - 1253
  • [4] Simplified Feedback Linearization Control of Three-Phase Photovoltaic Inverter With an LCL Filter
    Bao, Xianwen
    Zhuo, Fang
    Tian, Yuan
    Tan, Peixuan
    [J]. IEEE TRANSACTIONS ON POWER ELECTRONICS, 2013, 28 (06) : 2739 - 2752
  • [5] A novel control to actively damp resonance in input LC filter of a three-phase voltage source converter
    Blasko, V
    Kaura, V
    [J]. IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, 1997, 33 (02) : 542 - 550
  • [6] Model-based generation of low distortion currents in grid-coupled PWM-Inverters using an LCL output filter
    Bolsens, Bruno
    De Brabandere, Karel
    Van den Keybus, Jeroen
    Driesen, Johan
    Belmans, Ronnie
    [J]. IEEE TRANSACTIONS ON POWER ELECTRONICS, 2006, 21 (04) : 1032 - 1040
  • [7] Filter-Based Active Damping of Voltage Source Converters With LCL Filter
    Dannehl, Joerg
    Liserre, Marco
    Fuchs, Friedrich Wilhelm
    [J]. IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 2011, 58 (08) : 3623 - 3633
  • [8] PI State Space Current Control of Grid-Connected PWM Converters With LCL Filters
    Dannehl, Joerg
    Fuchs, Friedrich Wilhelm
    Thogersen, Paul Bach
    [J]. IEEE TRANSACTIONS ON POWER ELECTRONICS, 2010, 25 (09) : 2320 - 2330
  • [9] Observer-Based Grid-Voltage Sensorless Synchronization and Control of a VSI-LCL Tied to an Unbalanced Grid
    Fantino, Roberto A.
    Busada, Claudio A.
    Solsona, Jorge A.
    [J]. IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 2019, 66 (07) : 4972 - 4981
  • [10] DSP-Based Implementation of an LQR With Integral Action for a Three-Phase Three-Wire Shunt Active Power Filter
    Kedjar, Bachir
    Al-Haddad, Kamal
    [J]. IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 2009, 56 (08) : 2821 - 2828