LCL型有源滤波器电流指令补偿方法  

Reference Current Compensation Method for LCL Type Active Power Filter

作　　者：聂程[1] 雷万钧[1] 王跃[1] 尹诗媛 曹穆 NIE Cheng;LEI Wanjun;WANG Yue;YIN Shiyuan;CAO Mu(State Key Laboratory of Electrical Insulation and Power Equipment （Xi＇an Jiaotong University）, Xi＇an 710049, Shaanxi Province, China;Marine Design ＆ Research Institute of China, Huangpu District, Shanghai 200011, China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049 [2]中国船舶及海洋工程设计研究院,上海市黄浦区200011

出　　处：《电网技术》2018年第6期1929-1935,共7页Power System Technology

基　　金：国家自然科学基金项目(51207126)~~

摘　　要：虚拟电阻技术广泛的应用于变流器的控制中,可以有效抑制LCL型变流器输出电流的放大。现有的虚拟电阻阻尼技术主要是针对变流器只需要控制输出电流基波成分的应用场合。变流器输出的谐波电流会受到虚拟电阻阻尼控制的影响。当变流器用于补偿负载谐波电流时,其输出的谐波电流成分难以得到有效的控制,使得负载谐波电流的补偿效果变差。首先建立了虚拟电阻阻尼控制下变流器的模型,通过与二阶低通滤波器模型的近似关系,得到虚拟电阻的优化取值。随后,基于变流器的二阶低通滤波模型,通过对指令电流进行预调制,保证输出谐波电流的控制效果。最后,仿真和实验结果证明了建模及指令电流补偿方法的有效性,实现了对有源滤波器滤波性能的改善。To suppress output current amplification, virtual resistor damping strategy is widely used in LCL type inverter control. Existing virtual resistor is mainly used in application of fundamental harmonic energy transformation, ignoring its influence on output harmonic current control. This will adversely affect output harmonic current control. For application in active power filter（APF）, load harmonic current compensation performance is hardly guaranteed. Based on comparison between inverter model with virtual resistor damping and 2 nd order low-pass filter, the method of optimizing virtual resistance is found. And based on the approximate 2 nd order low-pass filter model, reference current compensation method is presented. The output current control performance is guaranteed. Simulation and experiment results are provided to validate correctness of the modeling and effectiveness of the virtual resistor control and phase compensation control.

关 键 词：LCL型滤波器 电流控制 优化虚拟电阻 指令电流补偿 

分 类 号：TM721[电气工程—电力系统及自动化]