| 摘要 |
PROBLEM TO BE SOLVED: To control voltage regulation of a load center point to an allowable value. SOLUTION: An SVR(step voltage control unit) and an SVC (series type voltage control unit) are installed in a distribution line. The SVC makes the voltage regulationεof a voltage VL of a load center point (a) viewed from a primary voltage V1 the starting condition. In order to avoid the start of the SVC due to gentle voltage change and surely compensate sharp voltage change only,εis obtained by setting the magnitude of the load center point voltage beforeΔT seconds (changing value reference time) obtained by moving average processing of the voltage VL as a reference voltage VLref. Concerning a voltage V2' of the point (a) viewed from a secondary voltage V2, a voltage regulationε' to VLref is obtained. A generating voltage VC of the SVC is so controlled thatε' becomes the allowable valueα. When a load L changes quickly andεis larger thanα, the SVC starts and controls to obtain a relation ofε'=α. After that, the SVR starts late, and steps up or down one tap. In the case ofε<α, the SVC stops.
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