基于分数阶PIλ的MMC并网控制策略  

MMC grid-connected control strategy based on fractional order PIλ

作　　者：张晓 周康 吴凡 Zhang Xiao;Zhou Kang;Wu Fan(School of Electrical and Power Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)

机构地区：[1]中国矿业大学电气与动力工程学院,江苏徐州221116

出　　处：《电测与仪表》2020年第18期115-121,共7页Electrical Measurement & Instrumentation

摘　　要：模块化多电平变换器(Modular Multilevel Converter,MMC)由于其具有输出电平数目多、输出电能质量高等优点被广泛应用到并网逆变系统中,文中针对MMC并网控制提出了基于分数阶PIλ的前馈电流解耦控制策略,在满足系统稳态性能的同时,进一步提高系统的动态性能与鲁棒性。PIλ控制器的参数设计主要结合向量法与ITAE准则,并采用改进的Oustaloup近似算法与Tustin离散化方法实现控制器的数字化应用。通过仿真与实验比较分数阶PIλ控制器与传统PI控制器的控制效果,证明分数阶PIλ控制器具有更好的跟踪性能,更快的响应速度,得到的网侧电流谐波畸变率(THD)更低,更好地实现了MMC并网运行。Due to its advantages of high output level and high output power quality,the modular multilevel converter(MMC)is widely used in grid-connected inverter systems.In this paper,a feedforward current decoupling control strategy based on fractional order PIλis proposed for MMC grid-connected control.This strategy further improves the dynamic performance and robustness of the system while satisfying the steady state performance of the system.The parameter design of the PIλcontroller is mainly combined with the vector method and the ITAE criterion.Meanwhile,the improved Oustaloup approximation algorithm and the Tustin discretization method are used to realize digital application of the controller.By comparing the control effects of simulations and experiments using PIλcontroller and PI controller which have demonstrated that the fractional order PIλcontroller has better tracking performance,faster response speed,lower THD of grid-connected current,and better MMC grid-connected operation.

关 键 词：模块化多电平变换器 分数阶 并网电流 谐波畸变率 

分 类 号：TM46[电气工程—电器]