{"title":"变速风扇系统中的谐波","authors":"A. El-Koubysi, M. Morcos, A. Heber, J. Li","doi":"10.1109/NAPS.1990.151357","DOIUrl":null,"url":null,"abstract":"The characteristics of harmonics generated by variable speed fan systems used for ventilation of agricultural buildings are reported. The fan system is controlled with a variable speed, triac-based fan controller and is fitted with a three-bladed, 30 degrees pitch polypropylene propeller. A test is conducted to evaluate voltage and current harmonics produced as a result of the triac's presence in the fan system circuit. The triac introduced harmonics into the current waveform which reduced the motor efficiency. The fan system is not a significant source of voltage harmonics for the utility. Current harmonics are at significant levels with the third current harmonic being the highest at 100% of the fundamental.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Harmonics in variable speed fan systems\",\"authors\":\"A. El-Koubysi, M. Morcos, A. Heber, J. Li\",\"doi\":\"10.1109/NAPS.1990.151357\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The characteristics of harmonics generated by variable speed fan systems used for ventilation of agricultural buildings are reported. The fan system is controlled with a variable speed, triac-based fan controller and is fitted with a three-bladed, 30 degrees pitch polypropylene propeller. A test is conducted to evaluate voltage and current harmonics produced as a result of the triac's presence in the fan system circuit. The triac introduced harmonics into the current waveform which reduced the motor efficiency. The fan system is not a significant source of voltage harmonics for the utility. Current harmonics are at significant levels with the third current harmonic being the highest at 100% of the fundamental.<<ETX>>\",\"PeriodicalId\":330083,\"journal\":{\"name\":\"Proceedings of the Twenty-Second Annual North American Power Symposium\",\"volume\":\"1 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1990-10-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings of the Twenty-Second Annual North American Power Symposium\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/NAPS.1990.151357\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Twenty-Second Annual North American Power Symposium","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/NAPS.1990.151357","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
The characteristics of harmonics generated by variable speed fan systems used for ventilation of agricultural buildings are reported. The fan system is controlled with a variable speed, triac-based fan controller and is fitted with a three-bladed, 30 degrees pitch polypropylene propeller. A test is conducted to evaluate voltage and current harmonics produced as a result of the triac's presence in the fan system circuit. The triac introduced harmonics into the current waveform which reduced the motor efficiency. The fan system is not a significant source of voltage harmonics for the utility. Current harmonics are at significant levels with the third current harmonic being the highest at 100% of the fundamental.<>
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