全功率风电系统网侧变流器多次采样的并网电流谐波抑制策略  

Grid-Connected Current Harmonic Suppression Strategy Based on Multi-sampling Control for Full Power Wind Converter System

作　　者：王成悦[1] 汪令祥[1] 谢震[2] WANG Chengyue;WANG Lingxiang;XIE Zhen(Sungrow Power Supply Co. , Ltd. , Hefei 230088, China;School of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]阳光电源股份有限公司,安徽合肥230088 [2]合肥工业大学电气与自动化工程学院,安徽合肥230009

出　　处：《电器与能效管理技术》2018年第8期70-78,共9页Electrical & Energy Management Technology

基　　金："十二五"国家科技支撑计划项目(2012BAA01B04)

摘　　要：为改善全功率变流器系统的输出电能质量,分析了基于PIR控制器的并网电流谐波抑制策略的局限性,提出了一种基于滤波电容电流检测和多次采样的并网电流谐波抑制策略。通过滤波电容电流检测提取并网电流的谐波分量,并通过谐振控制器进行调节,谐振控制器的输出与基波电流PI调节器输出叠加,从而实现网侧变流器并网电流的谐波抑制。与常规的基于单次采样的电流控制方案相比,多次采样的电流控制策略可以实现并网电流基波和谐波分量的无静差控制,消除因电网电压谐波扰动造成的并网电流谐波,在电网背景谐波环境下提升系统持续运行能力,同时实现较高质量的并网电流输出。最后,通过仿真和试验验证了所提方案的有效性。Low subharmonic grid-voltage and nonlinear power electronic devices may cause full-power wind converter generate many harmonic currents. The limitation of existing grid-connected current harmonic suppression strategy based on PIR regulator was analyzed,and one new harmonic control method based on filter capacitor current detection was proposed. In order to eliminate the grid-connected current harmonic,current harmonic component is firstly extracted,then it is adjusted by resonant controller,and the output quantity of resonant controller and PI adjuster are added up. The influence of multi-sampling factor on current harmonic control was also researched.Compared with the conventional control strategy based on single sampling technique,multi-sampling based current control scheme could achieve the none-static-error control of grid current fundamental and harmonic component.Under the background of high harmonic content of grid voltage,wind converter system could make high quality output current,while ensuring the lasting and stable operation. At last,the effectiveness of the proposed scheme was verified by simulation and experiment.

关 键 词：风力发电 网侧变流器 LCL滤波器 谐波电流 谐振调节器 多次采样 

分 类 号：TM614[电气工程—电力系统及自动化]