适用于非线性负载的逆变器多电压谐波控制策略  

Multi-Voltage Harmonics Control Strategy of Inverter Suitable for Nonlinear Loads

作　　者：董德智 周松林 朱云国 杨洪深 张涛 DONG Dezhi;ZHOU Songlin;ZHU Yunguo;YANG Hongshen;ZHANG Tao(Department of Electrical Engineering,Tongling College,Tongling,Anhui 244000,China;Research Center for Photovoltaic System Engineering of Ministry of Education,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]铜陵学院电气工程学院,安徽铜陵244000 [2]合肥工业大学教育部光伏系统工程研究中心,合肥230009

出　　处：《南方电网技术》2024年第8期152-166,共15页Southern Power System Technology

基　　金：国家重点研发计划资助项目(2021YFB2601402);安徽省高等学校自然科学研究重点资助项目(KJ2021A1059,KJ2018A0483);安徽省高校协同创新资助项目(GXXT-2022-022,GXXT-2022-021)。

摘　　要：针对非线性负载下逆变器输出电压质量差、动态性能不足的问题,在传统双环控制的基础上提出了多电压谐波控制策略。首先,揭示了双环控制三相四线制逆变器非线性负载下输出电压畸变的机理,并分析了逆变输出电压谐波分布的特点。其次,对每相逆变器提出在各低次电压谐波频率的同步坐标系下实现谐波抑制的多电压谐波控制方法,根据不同电压谐波的特点提出基于解耦双同步坐标系的3次电压谐波dq分量构造以及解耦多同步坐标系的5、7次电压谐波dq分量构造的方法,以消除各dq轴信号的交流成分,提高电压谐波控制的性能。进而,在静止坐标系下建立各电压谐波控制环路统一数学模型,阐述了多电压谐波控制器参数的设计方法,并讨论了所提逆变器控制系统的输出阻抗特性和鲁棒性。最后,搭建200 kVA的T形三电平逆变器平台,用实验验证所提多电压谐波控制策略的正确性和有效性。To address the poor output issues of voltage quality and dynamic performance of inverters under nonlinear loads,a multivoltage harmonics(MVH)control strategy is proposed based on traditional dual-loop control.Firstly,the mechanism of output volt⁃age distortion in a three-phase four-wire inverter with dual-loop control under nonlinear loads is revealed,and the distribution characteristics of the output voltage harmonics in the inverter are analyzed.Secondly,a MVH control method is proposed for each phase inverter,in which each low order voltage harmonic is independently controlled in the corresponding synchronous coordinate system.Based on the characteristics of different voltage harmonics,a method for constructing the 3rd harmonic dq component of volt⁃age based on the decoupled dual synchronous coordinate system and the 5th and 7th harmonic dq components of voltage based on the decoupled multi synchronous coordinate system are proposed to eliminate the AC component of each dq axis signal and improve the performance of voltage harmonic control.Then,a unified mathematical model of each voltage harmonic control loop is established in the static coordinate system,and the design method of the MVH controller parameters is analyzed.The output impedance characteristics and robustness of the proposed inverter control system are discussed.Finally,a 200 kVA T-type three-level inverter platform is built to verify the correctness and effectiveness of the proposed MVH control strategy by experimental results.

关 键 词：逆变器 多电压谐波控制 非线性负载 电压畸变 

分 类 号：TM464[电气工程—电器]