CAJ | 학술논문

锁相环(phase-locked loop，PLL)技术的性能直接影响大规模并网系统的运行效果。为实现精确并网逆变控制，提出一种基于特定谐波消除(selective harmonic elimination， SHE)的锁相环技术。利用SHE能消除特定低次谐波的特性，将方波与SHE相结合，组成一种新颖的鉴相器；基于傅里叶分析，验证了该鉴相器的可行性。与常规 PLL 相比，该锁相技术大幅简化计算、便于数字化实现；且能保证在非理想电网环境下有效跟踪基波信号。Matlab仿真及DSP实验结果验证了该新颖锁相技术具有良好的动静态跟踪性能，且能同时适用于单相和三相并网系统。
쇄상배(phase-locked loop，PLL)기술적성능직접영향대규모병망계통적운행효과。위실현정학병망역변공제，제출일충기우특정해파소제(selective harmonic elimination， SHE)적쇄상배기술。이용SHE능소제특정저차해파적특성，장방파여SHE상결합，조성일충신영적감상기；기우부리협분석，험증료해감상기적가행성。여상규 PLL 상비，해쇄상기술대폭간화계산、편우수자화실현；차능보증재비이상전망배경하유효근종기파신호。Matlab방진급DSP실험결과험증료해신영쇄상기술구유량호적동정태근종성능，차능동시괄용우단상화삼상병망계통。
The performance of phase-locked loop (PLL) technology has a direct impact on the large-scale grid-connecting system. A new PLL method based on the selective harmonic elimination (SHE) theory was proposed to realize the precise grid-connecting inverter control. With the characteristics of eliminating selective harmonic components, the SHE theory combined with square wave has been adopted to form a novel phase detector, and whose feasibility was proved by the Fourier analysis. Compared to the classical PLL, this kind of PLL method could achieve a simplified calculation, an easy digital implementation and also make sure an effective fundamental signals tracking under non-ideal grid environment. MATLAB simulation and DSP experimental results verify the dynamic and steady tracking performance of this new kind of PLL, and which is both suitable for the single and three phases.