Negative-sequence governing device and method for test wire of motor train unit
A technology for test lines and EMUs, which is used in flexible AC transmission systems, reduction of asymmetry in multi-phase networks, and reactive power adjustment/elimination/compensation to ensure power supply quality and eliminate negative sequence effects.
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[0059] A specific embodiment of a negative sequence control method for an EMU test line, the method comprises the following steps:
[0060] S101: Installing a first thyristor-controlled reactor between phase A and phase B of the three-phase grid bus;
[0061] S102: setting the second thyristor control reactor 4 and the thyristor switching capacitor combination 5 between phase B and phase C of the three-phase grid bus;
[0062] S103: The control device 3 detects the A-phase or C-phase current of the primary side of the transformer in real time, so that the lagging inductive reactive current I output by the adjustable reactor L =I Am =I Cm ; Make the leading capacitive reactive current I output by the adjustable capacitor 2 C =I Am =I Cm ; where, I Am is the current of A-phase line on the 10KV side of the three-phase power grid on the primary side of the traction transformer; I Cm is the C-phase line current on the 10KV side of the three-phase power grid on the primary side...
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