| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 98 === It is an important work for Taiwan Power Company dispatchers to keep the system voltage around normal values. There are a lot of substations which have been controlled by the reactive power device controller (RPDC) set in control centers. The shunt capacitor (SC) or on-load tap changer (OLTC) will be operated when the state of substations satisfies the setting of RPDC. Thus, the substation voltage can be kept in normal values to reduce the loss of transmission lines. However, it used to depend on the experience of dispatcher to operate devices when the substation is in manual mode. This is not reliable. Therefore, this paper is used to study the nine-area diagram and sensitivity matrix to devise a mechanism of voltage and reactive power control in the primary substation. By using this method, dispatchers can make a judgment and conjecture the control effect quickly. This paper has studied the effect of voltage and reactive control in substations by using ASPEN and measurement data. Besides, the sensitivity parameters have been got from the effect study. The measurement data of voltage control in the Banciao Primary Substation and the Jhongli Primary Substation were used to investigate the sensitivity matrix. Finally, the integrated sensitivity matrix and nine-diagram is illustrated for the voltage and reactive power control pattern in primary substations.
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