摘要
针对模块化多电平换流器环流抑制策略的研究主要集中在三相,为此提出了一种基于微分平坦理论的单相MMC新型环流抑制策略。首先由二阶广义积分器提取二倍频环流量,然后经全通滤波器构造虚拟正交量,再由前馈控制和动态误差反馈两部分组成环流控制器,前馈控制作为主导控制量由输入变量和状态变量及系统期望平坦输出参考轨迹之间的函数关系构成;误差反馈控制用于消除期望值与实际值误差和内外部扰动的影响,增强控制器动态响应速度。最后在PSCAD/EMTDC中搭建仿真模型,验证所提环流控制策略的有效性。
The existing research of circulating current suppressing controller for modular multilevel converter(MMC)are mainly focused on three-phase system.A novel circulating current reducing method based on differential flatness theory is proposed for single-phase MMC.Firstly,the second-order generalized integrator is used to obtain the double frequency circulating current component.Secondly,all pass filter(APF)is introduced to produce the orthogonal virtual vector.The proposed controller is composed of feed-forward control and dynamic error feed-back control.Feedforward control,as the dominant control variable,consists of the functional relationship between input variables,and state variables and the desired flat output reference trajectory of the system.The feed-back error control is used to eliminate errors between desired and actual outputs,and impact of internal and external disturbances.As a result,the controller dynamic response speed is enhanced.Finally,a simulation model is built on PSCAD/EMTDC and simulation results verify the effectiveness of the proposed circulating current control strategy.
作者
宋平岗
周鹏辉
江志强
肖丹
SONG Pinggang;ZHOU Penghui;JIANG Zhiqiang;XIAO Dan(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)
出处
《现代电力》
北大核心
2019年第6期23-28,共6页
Modern Electric Power
基金
国家自然科学基金项目(51367008)
关键词
模块化多电平换流器
单相
微分平坦
环流抑制
误差补偿
modular multilevel converter
single-phase
differential flatness
circulating current reduction
error compensation
