REACTIVE POWER COMPENSATION APPARATUS AND POWER SYSTEM VOLTAGE CONTROL METHOD USING THE SAME

摘要

PROBLEM TO BE SOLVED: To address the problem that: a lot of distributed power sources, the output of which greatly fluctuates according to the weather, are linked in a power distribution system, and the system voltage suddenly fluctuates in many cases; such a voltage fluctuation has a short fluctuation cycle, and thus, is difficult to suppress with an existing voltage adjustment apparatus; accordingly, a reactive power compensation apparatus is provided to suppress the voltage fluctuation; a conventional reactive power compensation apparatus suppresses a voltage fluctuation caused by operation of an existing voltage adjustment device; and as a result, in the worst case, output of the reactive power compensation apparatus is fixed to a compensable upper/lower limit value so that a voltage fluctuation the fluctuation cycle of which is short cannot be suppressed.SOLUTION: A filter for extracting a short-period fluctuation component of system voltage and a compensator having no integration function are used in a control device of a reactive power compensation apparatus (STATCOM). Accordingly, for a voltage fluctuation caused by operation of an existing voltage adjustment apparatus, reactive power output can be regularly made substantially zero. As a result of this, a voltage fluctuation the fluctuation cycle of which is short can be suppressed.SELECTED DRAWING: Figure 1