現代電子設備的使用常常導致諧波產生,例如大量使用個人電腦、不斷電系統(UPS)、變頻器或是整流器。非線性負載所產生的諧波污染將導致原本平滑的正弦電流波形產生畸變失真。 本文將針對諧波定義、來源、影響範圍及諧波改善方法作初步介紹,然後利用實測得知之諧波電流,透過NEPLAN軟體加以模擬分析,分析之結果可提供工廠之電力系統操作及維護人員推算出配電系統中可能發生之諧波問題點,進而採取預防措施,避免電力諧波造成系統危害,防止事故之發生。 另外,本文針對濾波器裝設位置的不同,進行系統可靠度分析,期望在抑制諧波的過程中,不會因此導致系統可靠度下降。
Harmonics are the by-products of modern electronics. They occur frequently when there are large numbers of personal computers (single phase loads), uninterruptible power supplies (UPSs), variable frequency drives (AC and DC) or any electronic device using solid state power switching supplies. Non-linear loads produce harmonics cause distorted current. In this thesis, the definition of harmonic, sources, impact and improvements were provided. The measured harmonic current data through software package NEPLAN were used for simulation. The simulation results could give the technicians and maintainers for reference in the power system where the harmonics may happen. Therefore, they could prevent the power system from damage and accidents. On the other hand, the reliability in a power system was analyzed by considering different placement of passive filters. It is expected that the reliability will not decrease due to harmonic reduction.