Control method of variable frequency transformer fault ride-through circuit, and related circuit
A transformer failure and control method technology, applied to a single AC network with different frequencies, circuit devices, AC network circuits, etc., can solve problems such as noise pollution, variable frequency transformer torque fluctuations, and limited effect of short-circuit current limitation
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no. 1 example
[0108] Please refer to Figure 4 , Figure 4 It is a schematic structural diagram of a variable frequency transformer fault ride-through circuit provided by the embodiment of the present application.
[0109] This embodiment provides a variable frequency transformer fault ride-through circuit, which can increase the circuit voltage and reduce the short-circuit current by compensating reactive power, and prevent the voltage drop from falling to the other side of the power grid. This embodiment may include:
[0110] The first power grid 1, the second power grid 2, the variable frequency transformer 3, the first three-phase rectifier 6, the motor drive converter 4, the first compensation circuit 5 and the control circuit 7;
[0111] The first grid 1 is connected to one end of the input end of the first three-phase rectifier 6 and the output end of the first compensation circuit 5;
[0112] The other end of the output end of the first compensation circuit 5 is connected with the...
no. 2 example
[0135] Please refer to Figure 6 , Figure 6 It is a schematic structural diagram of another variable frequency transformer fault ride-through circuit provided by the embodiment of the present application.
[0136] The first voltage compensation circuit provided by the embodiment of the present application is one-sided compensation, which cannot solve the voltage drop problem on the other side. Therefore, based on the first voltage compensation circuit embodiment, this implementation aims at the voltage drop problem that occurs on both sides. , as a supplementary note, the other parts are substantially the same as the previous embodiment, and the same parts can refer to the previous embodiment, and will not be repeated here.
[0137] Based on the first embodiment, this embodiment may further include a second three-phase rectifier 8 and a second compensation circuit 9;
[0138] The second grid 2 is connected to one end of the input end of the second three-phase rectifier 8 an...
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