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电网技术  2015 

基于模糊控制的变斜率VDCOL控制器设计

DOI: 10.13335/j.1000-3673.pst.2015.07.008, PP. 1814-1818

Keywords: VDCOL,变斜率,模糊理论,PSCAD,MATLAB

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Abstract:

高压直流输电系统发生换相失败时,可能引起系统后续的换相失败。为抑制后续换相失败的发生并加快系统的恢复速度,提出一种基于模糊控制理论的变斜率低压限流控制器(voltagedependentcurrentorderlimiter,VDCOL)设计方案。该VDCOL控制器将常规VDCOL线性关系的静态恢复特性改变为变斜率的静态恢复特性,并且采用模糊控制理论构建了模糊VDCOL,将电压水平及其变化率作为输入量,经过模糊化、模糊推理运算、去模糊化得到输出指令,对电流进行有效的动态调节。在PSCAD软件中搭建两端直流输电系统模型,并与Matlab软件互联进行了仿真。仿真结果验证了该模糊VDCOL控制器在抑制系统后续换相失败及加快系统恢复速度方面的有效性。

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