| 摘要: | 隨著能源成本的提高，各國紛紛祭出新能源政策，尋求替代能源，促使具有分散式電源的微電網系統逐漸受到重視。雖然分散式電源減低了在電力系統中新能源成本上的投資、提供虛功補償、調節頻率變化、增加系統備轉容量、改善電網之穩定度，同時也導致一些對系統負面的影響如：不平衡、電壓調節、諧波與間諧波、電壓閃爍等電力品質問題。 為了有效地評估出該系統造成的電力品質，一套簡易與準確的分析方法是十分重要的。自1960年代以降，由於有效計算離散傅立葉轉換(Discrete Fourier Transform, DFT)演算法─快速傅立葉轉換(Fast Fourier Transform, FFT)的開發，促使數位量測技術大幅提升。因而，國內外於通訊、語音、影像、控制等各研究領域逐漸大受採用。然而，由於FFT的直接使用受限於諸多限制，促使分析與量測電力設備造成之電力品質干擾時，將造成可觀的誤差。 由於文獻常用的電力品質分析演算法各異，對不同的電力訊號有各自的使用限制，無經驗的系統分析工程師容易誤用，以致無法有效正確地進行訊號處理。因此，本計畫將就目前常見之電力品質分析方法進行回顧，並提出完善的整合型監測系統與相關系統模擬，以強化核能研究所交流微電網電力品質的管控及改善策略。 綜合上述，本計畫未來之主要研究內容包括：(1)針對現行之電力品質信號處理方法進行回顧與比較；(2)實作各項分析技術與比較其優劣；(3)針對所提出之設計準則研擬符合IEC規範之交流微電網電力監測與保護系統設計與實作；(4)以實現之微電網電力監測與保護系統進行實際量測與分析；(5)設計與建立相關之電力品質信號量測資料庫；(6)提出改善策略，強化該微電網系統之電力品質。 ;With the raise of energy cost, every country proposes many strategies to search for alternative energy. This trend makes the microgrid system with distributed energy sources more attractive. Distributed energy resources can reduce the investment cost of building new fossil-fuel based power plant, mitigate the carbon oxide reduction, provide reactive power compensation and frequency regulation, increase the spin reserve, and enhance the system stability. However, some undesired effects are accompanied with their installations and operations, such as imbalance, voltage regulation, voltage fluctuation, and harmonics, as well as interharmonics. To effectively estimate the power quality of systems, a simple and accurate analysis method is important. Due to the development of fast Fourier transform (FFT) for efficient computation of discrete Fourier transform (DFT), digital measuring techniques have been greatly promoted since 1960s. Therefore, FFT has been widely used in the fields of communication, acoustics, videos, and control. However, since there are several limitations in FFT, direct usage of this technique would lead to significant estimation errors. Because those power quality analysis methods are quite different and have different limitations for different power signals, inexperienced engineers may not be able to effectively and correctly apply these techniques. Hence, several commonly used methods will be reviewed and compared in this project, and a suitable combined measuring system and system simulations will also be proposed to enhance power quality control and provide some strategies for remedy of power quality in AC microgrid of Institute of Nuclear Energy Research (INER). From above, the main tasks of this project can be summarized, which include: (1) Review and compare the recent power quality signal processing methods; (2) Implement reviewed methods and make comparisons of performance; (3)Design and implement the power monitoring and protection system based on INER microgrid according to the proposed designing rules and IEC standards; (4) Make the measurements and analysis for the actual disturbance sources with the developed microgrid power monitoring and protection system; (5) Establish and design the related database for the power quality signal measurements; (6) Propose the remedial strategies to enhance the power quality of INER microgrid. |
