| 摘要 |
<p>The present invention relates to an on-load tap changer control method for a power transformer (5) in a power system, where the power transformer has a primary side for a connection to a first grid in which electric power is generated (3), and a secondary side for connection to a second grid (9) in which electrical power is consumed, the power transformer (5) being equipped with an on-load tap changer (7), said method comprising the following steps: measuring the voltage and current at least on the primary side ( u1; i1 ) or on the secondary side (u2; i2 ) of the power transformer, processing said measured voltages (u1; u2) and currents (i1; i 2) in order to derive prospective reactive power at the output of the power transformer (5) after prospective tap-change, - compare prospective reactive power to a predefined set-point, - initiate tap-change of on-load tap changer (7) if prospective reactive power is closer to said predefined set-point than actual reactive power.</p> |
