河海大学学报(自然科学版)
河海大學學報(自然科學版)
하해대학학보(자연과학판)
JOURNAL OF HOHAI UNIVERSITY (NATURAL SCIENCES)
2010年
2期
231-235
,共5页
相海涛%戴卫力%蒋海江%严仰光
相海濤%戴衛力%蔣海江%嚴仰光
상해도%대위력%장해강%엄앙광
谐振频率%孤岛效应检测%主动频率偏移%检测盲区
諧振頻率%孤島效應檢測%主動頻率偏移%檢測盲區
해진빈솔%고도효응검측%주동빈솔편이%검측맹구
resonant frequency%islanding detection%active frequency drift%non-detection zone
采用间歇性扰动和加大频率扰动周期的方法提高并网逆变器主动频率偏移法孤岛效应检测的性能,减小其检测盲区.在间歇性扰动方法中,插入不施加扰动的时段,孤岛效应情况下该时段内系统工作频率为负载的谐振频率,根据谐振频率来确定扰动的方向,可获得相应扰动幅度下最小的检测盲区;加大频率扰动周期的方法可以相对较小的频率扰动幅度,在保证电流波形质量基础上进一步提高孤岛效应检测的性能.
採用間歇性擾動和加大頻率擾動週期的方法提高併網逆變器主動頻率偏移法孤島效應檢測的性能,減小其檢測盲區.在間歇性擾動方法中,插入不施加擾動的時段,孤島效應情況下該時段內繫統工作頻率為負載的諧振頻率,根據諧振頻率來確定擾動的方嚮,可穫得相應擾動幅度下最小的檢測盲區;加大頻率擾動週期的方法可以相對較小的頻率擾動幅度,在保證電流波形質量基礎上進一步提高孤島效應檢測的性能.
채용간헐성우동화가대빈솔우동주기적방법제고병망역변기주동빈솔편이법고도효응검측적성능,감소기검측맹구.재간헐성우동방법중,삽입불시가우동적시단,고도효응정황하해시단내계통공작빈솔위부재적해진빈솔,근거해진빈솔래학정우동적방향,가획득상응우동폭도하최소적검측맹구;가대빈솔우동주기적방법가이상대교소적빈솔우동폭도,재보증전류파형질량기출상진일보제고고도효응검측적성능.
Two methods, the intermittent frequency drift and the increase of the period of frequency disturbance, were employed to raise the islanding dection performance of active frequency drift methods for grid-connected inverters and to reduce the non-detection zone of traditional active frequency drift methods. As for the intermittent frequency drift method, a no-disturbing interval was inserted into the continous disturbing process. The operating frequency during this interval was the resonant frequency of the resonant load. The system decided the disturbing direction based on the sampled resonant frequencies of the load, and the non-detection zone might be minimized under the corresponding distubing steps. The method of increase of the period of frequency disturbance might improve the islanding detection performance with smaller frequency distubing steps based on the guarantee of quality of current waveform.