12-pulse VSI用於串聯型動態電壓調整器之研究

Abstract

科技產業的蓬勃發展下，工業界也隨著對產品的需求與日劇增，進而擴廠或添加精密度更高的負載設備用以提高產能或提升產品良率，相形之下電力品質也就相對重要。已有很多的研究是在針對在電壓驟降下，如何來減少對敏感性設備的傷害，進而節省成本，減少損失;其中動態電壓調整器(Dynamic Voltage Regulator，DVR)為近年來被運用解決電壓變動的方法之一。 本論文之目的在設計十二脈波串聯型動態電壓調整器，以連接一直流電容器提供電壓，再搭配使用十二脈波技術完成三相電壓源型變流器(Voltage Source Inverter，VSI)之設計，另外會與脈寬調變(Pulse Wide Modulated，PWM)切換之VSI做比較。 論文中主要針對兩種動態電壓調整器在穩態及暫態兩方面之特性進行研究與比較，間接說明十二脈波電壓源變流器的優點，包括補償能力以及功率損失，目標為藉由較小值直流電容電壓來提供較PWM切換VSI更佳之補償能力。模擬方面使用MATLAB 軟體來評估系統補償效果；實驗方面以個人電腦為基礎，配合資料擷取卡透過C語言來達成電壓補償控制，最後由模擬搭配實驗結果來驗證十二脈波動態電壓調整器在配電系統中之應用及其優越性。

With the development of high technology industries, the proliferation of voltage-sensitive load equipment has made industrial processes much more vulnerable to degradation in the quality of power supply. Among the several novel custom power devices, the dynamic voltage restorer (DVR) for application in distribution systems is a recent invention. The purpose of this thesis is to design a 12-pulse series-type Dynamic Voltage Regulator . A direct current capacitor is employed as the storage device for the DVR and the 12 - pulse control technique is used to adjust the output voltage of the three-phase voltage-source inverter (VSI). The 12-pulse VSI is compared with the Pulse Wide Modulated (PWM) VSI. Both steady-state performance and transient characteristic of the DVR are investigated in the thesis. To show the advantage of the proposed 12-pulse VSI, compensation capability and power loss are investignted. The purpose is use a lower direct current capacitor voltage than the PWM VSI to achieve voltage compensation. The effectiveness of the designed DVR is first investigated by digital simulations using the MATLAB software. Then, in the experiment, the control kernel of the digital system for the DVR is based on a personal computer with data acquisition cards. Voltage compensation is achieved through the computer coder written in C language. Finally, it is concluded from results of simulations and experiments that load bus voltage can be effectively and superiorly regulated by the designed 12-pulse VSI DVR.