A variable frequency transformer fault ride-through control method and circuit
A technology of transformer fault and control method, which is applied to control generators, control electromechanical brakes, control electromechanical transmission devices, etc., can solve the problems of fluctuation and high cost of fault ride-through circuit, and achieve the effect of reducing system cost
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Embodiment 1
[0072] The purpose of this application is to provide a variable frequency transformer fault ride-through circuit without a parallel three-phase converter, and propose a fault ride-through control method to achieve "use the left series three-phase converter to solve the unbalance problem on the left, and use the right The series three-phase converter solves the unbalance problem on the right”, and can maintain the stability of the DC bus voltage and maintain the control ability of reactive power without parallel three-phase converters.
[0073] The specific idea is: by controlling the output voltage of the three-phase converter connected in series on the stator side, the following effects can be achieved: (1) maintaining the stability of the DC bus voltage; (2) maintaining the ability to control reactive power; (3) suppressing the negative sequence voltage of the stator .
[0074] The negative sequence voltage of the rotor is suppressed by controlling the output voltage of the ...
Embodiment 2
[0109] This embodiment provides a variable frequency transformer fault ride-through circuit, such as Figure 5 As shown, it includes: stator-side power grid 1, stator-side series three-phase transformer 31, stator-side series three-phase converter 41, control circuit, H-bridge converter 6, rotor-side series three-phase converter 42, rotor-side series three-phase Transformer 32, rotor side grid 2;
[0110] The stator side grid 1 is connected to one end of the AC output end of the stator side series three-phase transformer 31;
[0111] The other end of the AC output end of the three-phase series transformer 31 on the stator side is connected to the stator winding of the variable frequency transformer 9;
[0112] The AC input terminal of the stator-side three-phase series transformer 31 is connected to the AC terminal of the stator-side series three-phase converter 41;
[0113] The rotor side grid 2 is connected to one end of the AC output end of the rotor side series three-pha...
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