基于模糊控制的变斜率VDCOL控制器设计  

Design of Variable Slope VDCOL Controller Based on Fuzzy Control

作　　者：刘磊[1] 王渝红[1] 李兴源[1] 张彪[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065

出　　处：《电网技术》2015年第7期1814-1818,共5页Power System Technology

基　　金：国家重点基础研究发展计划(973计划)(2013CB228204);国家电网公司大电网重大专项资助项目课题(SGCC-MPLG027-2012)~~

摘　　要：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(voltage dependent current order limiter,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。When commutation failure happens in HVDC system, it may cause subsequent commutation failure. In order to restrain subsequent commutation failure and accelerate system＇s recovery, a variable slope VDCOL（Voltage Dependent Current Order Limiter） controller based on fuzzy control is proposed in this paper. This VDCOL controller not only changes the linear static recovery characteristics of ordinary VDCOL to variable slope recovery characteristics, but also adopts fuzzy control theory to build a fuzzy VDCOL which treats the voltage level and its change rate as inputs. After fuzzification, fuzzy inference operation and deblurring, output instruction is obtained which can adjust the current effectively and dynamically. An HVDC system model is built and simulated in PSCAD which is connected with Matlab. The results of simulation demonstrate that the fuzzy VDCOL controller can restrain system＇s subsequent commutation failure and accelerate system＇s recovery speed effectively.

关 键 词：VDCOL 变斜率 模糊理论 PSCAD MATLAB 

分 类 号：TM721[电气工程—电力系统及自动化]