基于统一坐标变换的三电平有源电力滤波器研究.pdfVIP

学兔兔 第53卷 第1期 电测与仪表 Vo1．53 No．1 2016年 1月lO日 Ekctrical Measurement＆ Instrumentation Jan．10，2016 基于统一坐标变换的三电平有源电力滤波器研究 李新兵 (扬州大学水利与能源动力工程学院，江苏扬州225127) 摘要：为实现有源电力滤波器电流的无静差控制，以三电平并联型有源电力滤波器(SAPF)为研究对象，将统一 坐标变换(UFP—CT)应用到三电平SAPF电流控制中。详细推导出了三电平SAPF在三相静止abc、两相静止、 统一坐标坐标系下的数学模型；采用常规的电压前馈电流解耦控制策略，同时对由坐标变换带来的自干扰和耦 合干扰进行前馈以克服其对输出的影响，控制器采用PI控制器，即可实现谐波电流的无静差跟踪。采用Simu— link进行了仿真，并和dq坐标系下控制方法进行了对比。仿真结果表明：基于统一坐标变换设计的电流控制 器可以实现对谐波电流指令的无静差跟踪，且具有更优的动态特性。 关键词：三电平；并联型有源滤波器；统一坐标变换；无静差；动态特性 中图分类号：TM744 文献标识码：B 文章编号：1001—1390(2016)01一O117—05 Research on three-level active power filter based on unified coordinate transfolrmation Li Xinbing (School ofHydraulic，Energy and Power Engineering，Yangzhou University，Yangzhou 225127，Jiangsu，China) Abstract：To realize the zero steady-state error current control of active power filter，taking three—level shunt active power filter(SAPF)as the object of study，the unified fixed point coordinate~ansformation(UFP·CT)was applied to three—level SAPF current control in this paper．The concept of a unified fixed point coordinate transformation was in一 ~oduced，and the mathematical model of three-level SAPF in the three—phase stmionary abc，two—phase stationary and unified fixed 一 point coordinate system was deduced in detail．It used the conventional vohage feed—forward cur— rent decoupling control strategy，the feed-forward was also introduced to overcome the impact of sel~interference and coupled interference brought by UFP—CT on output，and PI controller was utilized to achieve the zero steady—state error current contro1．Simulink is used to carry on the simulation，and the control method has carried on the contrast with control str