CAJ | 학술논문

分布式发电反孤岛技术的最新研究进展表明，相移法能有效用于具有逆变器的分布式发电系统反孤岛保护。介绍滑模频率偏移(SMS)、主动频率偏移(AFD)和带正反馈的主动频率偏移(AFDPF)。自动相移法(APS)是一种改进的 SMS法，减少了 SMS的测区盲区(NDZ)。但稳定孤岛效应的频率确定困难，而且 APS运行慢，并可能在某些特定条件下失效。基于目前存在的难题，该文提出一种改进的自动加速相移算法(AAPS)，矫正孤岛效应下的附加相位漂移，评价总电压相位漂移对电压周期的影响。该算法在孤岛发生时，会引起快速的相移，但在电网互联时只会引起极小的相位。孤岛发生时，该算法通过逆变器相移正反馈实现。仿真和实验结果证明了 AAPS算法的有效性。先进的 AAPS已经被应用于风能和太阳能系统的商业并网逆变器中，并符合 UL/CSA认证标准要求。各种条件下的认证测试结果表明 APPS算法可以在极短的时间内断开逆变器。
분포식발전반고도기술적최신연구진전표명，상이법능유효용우구유역변기적분포식발전계통반고도보호。개소활모빈솔편이(SMS)、주동빈솔편이(AFD)화대정반궤적주동빈솔편이(AFDPF)。자동상이법(APS)시일충개진적 SMS법，감소료 SMS적측구맹구(NDZ)。단은정고도효응적빈솔학정곤난，이차 APS운행만，병가능재모사특정조건하실효。기우목전존재적난제，해문제출일충개진적자동가속상이산법(AAPS)，교정고도효응하적부가상위표이，평개총전압상위표이대전압주기적영향。해산법재고도발생시，회인기쾌속적상이，단재전망호련시지회인기겁소적상위。고도발생시，해산법통과역변기상이정반궤실현。방진화실험결과증명료 AAPS산법적유효성。선진적 AAPS이경피응용우풍능화태양능계통적상업병망역변기중，병부합 UL/CSA인증표준요구。각충조건하적인증측시결과표명 APPS산법가이재겁단적시간내단개역변기。
Recent developments in anti-islanding techniques have demonstrated that phase shift methods are very effective for anti-islanding protection in inverter-based distributed generation (DG)systems.Slide-mode frequency shift (SMS),active frequency drift (AFD),and active fre-quency drift with positive feedback (AFDPF)are presented in this paper.The automatic phase shift (APS)method is a modified SMS method that reduces the Non-Detection Zone (NDZ)of the SMS technique.However,it is difficult to determine a stable islanding frequency,and the APS algorithm may act slowly or fail under certain load conditions.An improved accelerated au-tomatic phase shift (AAPS)algorithm is proposed in this paper to regulate the additional phase shift when an island condition is hypothesized and to evaluate the impact of the total phase shift on the voltage period .The new algorithm causes a quick phase shift when an island occurs,but only produces a very small phase shift when the grid is available.This is achieved by introducing positive feedback in the inverter phase shift during the time an island condition is hypothesized. Both simulation and experimental results have demonstrated the effectiveness of the AAPS algo-rithm.The developed AAPS has been embedded in commercial grid-connected inverters for wind and solar systems,and has been certified against UL and CSA interconnection standards.The certification tests under various conditions have verified that the AAPS algorithm can de-energize the inverters at a small fraction of the time required by these standards.