基于内模控制器的MMC-HVDC稳态控制  

Steady State Control of MMC-HVDC System Based on Internal Model Controller

作　　者：褚衍超 黄守道[1] 孔凡蓬 廖武[1] 

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082 [2]南车株洲电力机车研究所有限公司,湖南省株洲市412001

出　　处：《电网技术》2015年第8期2223-2229,共7页Power System Technology

基　　金：国家自然科学基金项目(51377050);国际科技合作项目(2011DFA62240)~~

摘　　要：模块化多电平高压直流输电系统(modular multilevel converter-high voltage direct current,MMC-HVDC)通常采用基于比例积分(proportional integral,PI)的双闭环矢量控制,而PI调节存在响应速度慢、dq电流需要旋转解耦等问题。为此文章提出在两相静止坐标下基于内模控制的MMCHVDC稳态控制方案。首先分析了两相静止坐标下的MMCHVDC数学模型,然后结合内模控制的特性,对电流内环的控制结构和参数进行设计,并将内模内环与PI外环结合构造出双闭环控制结构。最后在Matlab/Simulink中搭建了MMC-HVDC系统模型,对多种工况进行仿真。仿真结果表明,所设计的控制器能够有效抑制母线电压波动,并能对负荷变化快速响应,提高了系统的鲁棒性。Modular multilevel converter based HVDC（MMC-HVDC） transmission usually adopts double closed-loop vector control with PI, which has several problems such as slow response to disturbance and needs decoupling control under rotating coordinate. Therefore a new steady state control scheme of MMC-HVDC based on internal model controller is proposed under two-phase stationary coordinate. Firstly the mathematical model of MMC-HVDC system under two-phase stationary coordinate is introduced. By analyzing features of internal model control method, the control structure and parameters of the current cycle are designed,and a double closed-loop control system based on IMC inner-cycle and PI outer-cycle is built. The steady-state and dynamic performance of the proposed controllers under different operation conditions are shown with simulation of MMC-HVDC system in Matlab/Simulink. Simulation results show that the proposed controller really can suppress bus voltage fluctuations effectively, and respond quickly to load changes, greatly improving the robustness of the system.

关 键 词：模块化多电平换流器 高压直流 内模控制 两相静止坐标系 

分 类 号：TM73[电气工程—电力系统及自动化]