CAJ | 학술논문

快速准确地检测基波正序有功电流，对电能质量控制非常重要。许多传统方法都需使用锁相环、低通滤波器或进行αβ和dq坐标变换。为此，提出了一种新型检测方法。首先通过扇合矢量变换，将三相系统的电压和电流归一化为单相系统；然后通过构造级联延时信号消除模块对基波正序电压和电流进行快速提取；最后通过简单的数学计算，得到基波正序有功电流。该方法既不需要锁相环，也不需要低通滤波器，还能够省略使用αβ和dq坐标变换时的复杂计算。仿真结果验证了所提方法的有效性。
쾌속준학지검측기파정서유공전류，대전능질량공제비상중요。허다전통방법도수사용쇄상배、저통려파기혹진행αβ화dq좌표변환。위차，제출료일충신형검측방법。수선통과선합시량변환，장삼상계통적전압화전류귀일화위단상계통；연후통과구조급련연시신호소제모괴대기파정서전압화전류진행쾌속제취；최후통과간단적수학계산，득도기파정서유공전류。해방법기불수요쇄상배，야불수요저통려파기，환능구성략사용αβ화dq좌표변환시적복잡계산。방진결과험증료소제방법적유효성。
It is very important for power quality control to detect fundamental positive-sequence active current rapidly and accurately. In traditional detection approaches many techniques such as phase locked loop (PLL), low pass filter (LPF) or αβand dq coordinate transforms are often integrated, however there are certain limitations in these approaches, for this reason, a novel detection method is proposed. Firstly, by means of fan-in vector transformation a three-phase system is normalized into single-phase system; then through constructing cascaded-delayed signal cancellation module, the fundamental positive-sequence voltage and current are extracted rapidly;finally, positive-sequence active current can be obtained by simple calculation. In the proposed method nor PLL neither LPF are needed, besides the complex computation during αβand dq coordinate transformation can be omitted. The effectiveness of the proposed detection method is validated by simulation results.