Grid-side main circuit of industrial transmission system, transformer and control method
A transmission system and grid-side converter technology, applied in AC network circuits, transformer/inductor coils/windings/connections, circuit devices, etc. Wave size and other problems, to achieve the effect of reducing secondary current harmonics, reducing volume and cost
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[0040] Example one
[0041] figure 1 It is a structural diagram of a transformer provided by the present invention. The transformer is used for the grid-side main circuit of the industrial transmission system, connected to the AC bus, and includes: at least two primary windings 10 and at least two secondary windings 11 corresponding to the primary windings 10, the primary The windings 10 are connected in series, and the secondary windings 11 are independent and have a predetermined phase difference between two adjacent secondary windings 11.
[0042] Such as figure 1 As shown, the transformer includes N primary windings 10 and N secondary windings 11, the N primary windings 10 are in series, and the N secondary windings 11 are independent, and two adjacent secondary windings 11 It has a predetermined phase difference, that is, the secondary windings 11 are connected to the respective primary windings 10 in a phase-staggered manner. When N=2, that is, the transformer has 2 seconda...
Example Embodiment
[0052] Example two
[0053] image 3 It is a structural diagram of the main circuit on the grid side of an industrial transmission system provided by the present invention. The grid-side main circuit of the industrial transmission system includes: the transformer 30 as described in the first embodiment, and further includes: at least two grid-side converters 31 connected to the transformer 30, one of the grid-side converters 31 is connected to one of the secondary windings;
[0054] A control device 32 connected to the high-voltage side of the transformer 30 and the grid-side converter 31, wherein the control device 32 is connected to the high-voltage side and is used to obtain a synchronization signal on the high-voltage side of the transformer 30 e a,b,c , The control device 32 is connected to the current input end of the grid-side converter 31, and is used to collect the input current I of the grid-side converter 31 abc(1) ~I abc(N) The control device 32 is connected to the ...
Example Embodiment
[0060] As a preferred embodiment, the three-level diode midpoint clamp converter includes 12 switching devices and 18 diodes;
[0061] Wherein, the control device sends 12 pulse control signals to each of the three-level diode midpoint clamp converters to control the on-off of the 12 switching devices.
[0062] As a preferred embodiment, the switching device is an insulated gate bipolar transistor IGBT, an electron injection enhanced gate transistor IEGT or an integrated gate commutated thyristor IGCT.
[0063] Figure 4 It is a structural diagram of the main circuit on the grid side of another industrial transmission system provided by the present invention. As a preferred embodiment, the control device 32 includes:
[0064] A phase-locked loop 40 connected to the high-voltage side of the transformer 30, a voltage loop regulator 41 connected to the output end of the grid-side converter 31, and an active current regulator 42 connected to the voltage loop regulator 41 , A first coordi...
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