计及转矩振荡的双PWM交流调速系统谐波阻抗模型及电网低频振荡机理研究  

Harmonic Impedance Model of Dual-PWM Adjustable Speed Drives Under Torque Oscillation and the Mechanism of Low-frequency Oscillation in Distribution Grid

作　　者：杨迪瑞 姜建国[1] 钱侃 YANG Dirui;JIANG Jianguo;QIAN Kan(Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education(Shanghai Jiao Tong University),Minhang District,Shanghai 200240,China;Tongsheng Electricity Power Company Ltd.,Pudong District,Shanghai 200122,China)

机构地区：[1]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市闵行区200240 [2]上海同盛电力有限公司,上海市浦东新区200122

出　　处：《中国电机工程学报》2022年第3期980-991,共12页Proceedings of the CSEE

摘　　要：双脉宽调制(pulse width modulation,PWM)交流调速系统(adjustable speed drives,ASDs)耦合了电力系统与机械系统,使得机械系统振荡的能量通过其调制注入电网。文中首先分析谐波分量与调制波被载波共调制的机理,并在此基础上得到基于Bessel函数的2-D傅里叶级数开关函数。之后利用该开关函数建立包含电机、两侧变流器的双PWM ASDs谐波阻抗模型,特别是模型计及了电机转矩振荡对双PWMASDs稳态阻抗的改变,定量地将转矩振荡等效为谐波非线性阻抗。之后,通过研制的双PWMASD及电机与机械负载,验证所推导的谐波阻抗模型的准确性。最后,应用得出的模型与结论,结合上海洋山深水港区四期自动化码头配电网的实测数据,分析电网低频振荡的特征和机理,证明模型及结论的正确性和有效性。The dual-pulse width modulation(PWM)adjustable speed drives(ASDs)couple the power system and the mechanical system.Through its modulation,the energy of the mechanical oscillation is injected into the grid.This article first analyzed the mechanism of common-modulation of harmonics and fundamental.On this basis,a 2-D Fourier series switching function derived from the Bessel function was obtained.After that,the switching function was used to derive the harmonic impedance models of DC link and grid side of the dual PWM ASD,including the motor and the inverter.In particular,the model considered the change of the steady-state impedance of the dual PWM ASDs due to the motor torque oscillation,and quantitatively expressed the mechanical oscillation as the harmonic nonlinear impedance.The accuracy of the harmonic impedance model was verified by the developed dual PWM ASD,motor and mechanical load.Finally,the application of the model and developed theoretical analysis,combined with the measured data in the distribution grid of the Shanghai Yangshan deep-water port area,analyzed the characteristics and mechanism of the low-frequency oscillation events,and proved the accuracy and validity of the model and the conclusions.

关 键 词：双脉宽调制调速系统 谐波 阻抗模型 转矩振荡 电网低频振荡 

分 类 号：TM71[电气工程—电力系统及自动化]