直流母线小电容永磁同步电机驱动系统网侧电流谐波抑制策略  

Harmonic Suppression Strategy of Grid Side Current for DC-Link Small Capacitor Permanent Magnet Synchronous Motor Drive System

作　　者：宋健 宋文祥[1] 张钦清 Song Jian;Song Wenxiang;Zhang Qinqing(School of Mechatronic Engineering and Automation Shanghai University,Shanghai 200444 China)

机构地区：[1]上海大学机电工程与自动化学院,上海200444

出　　处：《电工技术学报》2024年第18期5668-5679,共12页Transactions of China Electrotechnical Society

摘　　要：直流母线采用小电容永磁同步电机驱动系统具有降低成本和延长运行寿命的优势。但在系统运行时网侧电流中存在大量的谐波,这将会影响网侧电流质量。为了改善小电容永磁同步电机(PMSM)驱动系统的网侧电能质量,该文提出一种基于阻抗重塑的有源阻尼控制方法,以抑制网侧电流谐波。通过对驱动系统进行建模,分析影响网侧电流谐波的因素,建立母线电流与网侧电流的数学关系。采用有源阻尼控制方法,提取母线电压谐波信号,以最优电压补偿的方式构建反馈回路,重塑驱动系统的特定频率处的等效阻抗,以实现网侧电流谐波的改善。同时,为了抑制电压补偿模块对电流内环扰动的影响,设计电流环级联双频陷波器,并通过系统极点图进行了稳定性分析。仿真结果和实验分析验证了所提控制方法的有效性。Traditional permanent magnet synchronous motor(PMSM)drive systems often use large-capacity electrolytic capacitors to keep the dc-link voltage constant.However,DC-link electrolytic capacitors have disadvantages of short life and large volume,leading to drive system failure.The small-capacity film capacitor instead of the dc-link large electrolytic capacitor is a trend to reduce the size and enhance system reliability.However,due to the substantial reduction of the dc-link capacitance,the energy coupling between the input side of the grid and the output side of the inverter is severe.When the system operates normally,the grid-side current generates a large number of harmonics,affecting the power quality of the grid side.This paper proposes an active damping control method based on impedance reshaping to suppress grid-side current harmonics.Firstly,the small-capacity PMSM drive system is modeled,and the factors affecting the grid-side current are obtained by analyzing the drive system impedance.Secondly,the harmonic characteristics of the grid-side current are analyzed,and the mathematical relationship between the dc-link current and the grid-side current is established.Then,an active damping control method based on virtual impedance is adopted,and a band-pass filter is used to extract the harmonic signal of the DC-link voltage.The feedback loop is constructed as optimal voltage compensation,the equivalent impedance at a specific frequency of the drive system is reshaped,and the grid-side current harmonics are improved.Finally,a cascaded dual-frequency notch filter for the current loop is designed to suppress the voltage compensation module’s influence on current inner loop disturbances.The simulation analysis shows that when the motor runs at 270 Hz and the load torque is 20 N•m,the grid side current THD decreases from 52.2%to 36.6%,finally decreasing to 32.7%.At the same time,the dc-link voltage ripple is reduced by 58.3%.The performance of the proposed control strategy is still good when the speed and load t

关 键 词：小电容电机驱动 网侧电流谐波 阻抗重塑 双频陷波器 电流环 

分 类 号：TM351[电气工程—电机]