隨著電力線網路在綠能產業引起很大的關注，許多常用的有線或無線的通訊系統對電磁干擾(EMI)的影響也創造了許多發展的可能性。目前，頻率在數百至數千的電力線網路被視為是自動讀表系統(AMI)的另一種替代品。
這篇論文分成兩個主要的部分：耦合器電路的實作跟低電壓電力線的負載測量。我們首先設計了一種適用於窄頻電力線系統的耦合器電路，同時擷取通訊訊息的頻率也滿足系統的要求。在實作的時候考慮了包括繞(捲)線在內的許多參數。也提出了在不同種類的繞線及鐵芯方法下，保護通訊設備及耦合電路的做法。為避免訊號衰減，調整傳送端耦合器跟接收器使得在阻抗上不會相互影響。事實上阻抗在電力線通道模型中扮演了很重要的角色。考慮到這點我們做出了在主動式傳送端耦合器電路和被動式傳送端耦合器以及主動接收端耦合器並在電力線上測量。
其次，在耦合電路的幫助下我們可以去測量不同電力負載的雜訊進而分析其對窄頻電力線通訊的影響。首先我們展示對獨立負載下雜訊的測量架構，並針對負載對於訊號的影響做量測；接著對於一些大學實驗室的電力配置所產生的雜訊做評估及分析。

As the significance of the power line networks is attracting a lot of attention in green energy industry, so are the impacts on other popular wired or wireless communications systems for the electro-magnetic interference (EMI) emitted upon the availability of vast deployment. Currently, narrowband power line communications (PLC) networks, whose frequency ranges from a few hundred hertz to several hundred kilo-hertz, have been considered as alternative for advanced metering infrastructure (AMI).
This thesis is partitioned into two major parts; the implementation of coupling circuit and measurement of the load on low-voltage power line. We first devise a coupling circuit suitable for narrowband PLC systems for injection as well as extraction of communications signaling such as its frequency response can meet system’s requirement. Indeed, several factors, including the winding core, are taken into account for the realization. Besides, protection on the coupling circuit subject to different wiring methods on power line is enforced. Impedance matching between transmitter’s and receiver’s couplers is achieved to avoid signal attenuation. Essentially, impedance of transmitter’s and receiver’s couplers plays an important role on the power line channel modeling. In view of this, we conduct the measurement of our realized couplers in terms of active and passive circuits, respectively.Secondly, with the aid of our devised coupling circuit, we can measure the noise from a variety of electrical appliances and subsequently analyze the deterioration on narrowband PLC systems. A framework for noise measurement on individual load is first illustrated, followed by assessment from arbitrary power outlets at certain university’s laboratory, where personal computers are commonly seen and frequently used.

[1] M. Katayama , T. Yamazato, H Okada, ” A mathematical model of noise in
narrowband power line communication systems,” IEEE J. Selected Areas in
Communications., vol. 24, no. 7, pp. 1267- 1276, July 2006.

[2] M. Kumar and V. Agarwal, “ Power line filter design for conducted
electromagnetic interference using time-domain measurement,”IEEE Trans.
Electromagn. Compatibility.,vol. 48, no. 1, pp. 178-186, Feb. 2006.

[3] Takatoshi MAENOU , Masaaki KATAYAMA, ”Study on Signal Attenuation
Characteristics in Power Line Communications,”IEEE Power Line\
Communications and Its Applications, pp. 217-221 , 2006.

[4] Araneo, R.; Celozzi, S.; Lovat, G. ,“Design of impedance matching couplers for
power line communications,”IEEE Electromagnetic Compatibility,pp.64-69,2009.

[5] Mloyiswa P.Sibanda,Petrus A.Janse van Rensburg,Hendrik C.Ferreira,“Passive,
Transformerless Coupling Circuitry for Narrow-BanPower-LineCommunications,
”Power Line Communications and Its Applications, 2009.ISPLC 2009. IEEE
International Symposium on,pp. 125-130 , 2009

[6] David Cooper,”Narrowband,Low Data Rate Communications on th Low-Voltage
Mains in the CENELEC Frequencies-Part I:Noise and Atenuation,”IEEE Trans. ,
vol.17,no.3,pp718-723,July. 2002.

[7] Daisuke Umehara ,Shinji Hirata ,Satoshi Denno and Yoshiteru Morihiro,
”Modeling of Impulse Noise for Indoor Broadband Power Line Communicatons,”
ISITA,pp195-200,October 29-November 1,2006.

[8] Petrus A.Janse van Rensburg and Hendrik C. Ferreira,”Coupler Winding Ratio
Selection for Effective Narrowband Power-Line Communications,”,IEEE Trans.
on power delivery ,vol. 23,no.1,pp140-149,Jan. 2008.

[9] Petrus A.Janse van Rensburg and Hendrik C. Ferreira,”Design of a Bidirectional
Impedance-Adapting Transformer Coupling Circuit for Low-Voltage Power-Line
Communications,”IEEE Trans. Power delivery ,vol. 20,no.1,pp64-70,Jan. 2005

[10] Application Note:”Ask Power Line Modem”,Philips Semiconductors

[11] Phil Sutterlin and Walter “Power Line communication Applications” Downey,Echelon Corporation,2005.

[12] Thomas L.Floyd ”Electronic Devices Conventional Current Version” 7th
ed.,pearson Education,Inc,Prentice Hall,2005

[13] 李永勳,蕭松欣,”電力線通訊系統之模擬與實測分析”第二十六屆電力工程研
討會, pp.255-259,Dec.2005

[14]稻葉保 著 白中和 譯,”類比電路技術提升101招”，建興文化事業有限公司

[15]柯宗圻,”身心障礙者家庭自動化系統之低速電力線通訊技術之研製”國立成功大學碩士論文，民國94 年7 月