交流變頻調速以其可靠、節能、調速性能好等原因正在生產和生活各個領域得到廣泛應用。但是變頻器自身的原理和線路特點，也帶來了由諧波引起的種種問題。本文以交直交型的變頻器為例分析了交流變頻調速裝置主電路產生諧波的原因，分析了其整流電路、逆變電路的諧波的特點，并指出了諧波對于電網、其他用電設備、拖動系統自身的影響。最后指出抑制諧波干擾的幾個重要措施。本文對于變頻器的設計與應用，具有一定的現實指導意義。
關鍵詞：變頻裝置 主回路 諧波
Abstract: For the excellent performance on reliability, energy saving and features of driving machines, frequency converter drive systems have been widely applied in areas of production and daily life. However, the theories and circuits of frequency converter results in the vital problems of harmonics. This paper analyzed the reasons of harmonics happening and the features of harmonics in AC-DC-AC frequency converter drive system’s main circuit. The affections of harmonics to the electricity power net, other devices of electricity consumption and the drive system itself were pointed out. At last, methods of restraining harmonics interference were suggested. This paper is practical for frequency converter design and application.
Keywords: Frequency converter, Main circuit, Harmonics