摘要
随着模块化多电平高压直流输电（modular multilevel converter based high voltage direct current,MMC-HVDC）工程的不断推广应用,与MMC-HVDC所连交流电网呈现多样化趋势。为提高MMC-HVDC应对复杂交流电网的能力,提出基于无差拍控制和重复控制复合控制结构的桥臂电流控制策略。给出了无差拍-重复控制器的设计思路、参数设计方法,并对其稳定性进行了深入分析。详细分析了采样频率与电网频率之比为非整数时对控制性能的影响,提出采用三阶拉格朗日插值法逼近非整周期延时,并与传统的线性插值法的性能进行对比分析。所提无差拍-重复控制器能在谐波和不对称电网电压及电网频率变化等非理想工况下均取得良好的控制效果。仿真结果验证了所提控制策略的正确性和有效性。
With popularization and application of modular multilevel converter based HVDC（MMC-HVDC） project, AC power grids connected with MMC-HVDC show a trend of diversification. In order to enhance adaption of MMC-HVDC to AC power grid, arm current control strategy based on deadbeat and repetitive control is proposed in this paper. Design idea and parameter design method of arm current controller are described and stability of arm current controller is analyzed in depth. The effect of non-integral ratio of sampling frequency to grid frequency on control performance is analyzed. Three-order Lagrange interpolation method is adopted to approximate the non-integral cycle delay, and then its performance is compared with that of traditional linear interpolation method. The proposed control strategy works well under various non-ideal grid conditions, e.g. harmonic and unbalanced grid voltages, and grid frequency variation. Simulation results verify correctness and effectiveness of the proposed control strategy.
作者
梁营玉
刘建政
LIANG Yingyu;LIU Jianzheng(School of Mechanical Electronic and Information Engineering,China University of Mining and Technology（Beij ing）,Haidian District,Beijing 100083,China;State Key Lab of Control and Simulation of Power Systems and Generation Equipments（Tisinghua University）,Haidian District,Beijing 100084,China)
出处
《电网技术》
EI
CSCD
北大核心
2018年第8期2494-2502,共9页
Power System Technology
基金
国家自然科学基金项目(51707193,61703405)
教育部中央高校基本科研业务费专项资金资助项目(2017QJ05)~~
关键词
谐波及不对称电网电压
模块化多电平换流器
无差拍控制
重复控制
harmonic and unbalanced grid voltages
modular multilevel converter （MMC）
deadbeat control
repetitive control
