Energy feedback type power unit cascaded high voltage frequency converter
A high-voltage frequency converter and power unit technology, applied in the direction of converting AC power input to AC power output, converting irreversible DC power input into AC power output, and output power conversion devices, etc., can solve complex structures, processes, and inability Problems such as coordinated actions and complicated circuits can achieve the effect of reducing volume and weight, perfect and feasible scheme, and eliminating low-frequency pulsation
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[0055] The product of the present invention will be described in further detail below in conjunction with the accompanying drawings and the embodiments of the present invention.
[0056] Here is an example of an energy feedback type high-voltage inverter with three power units connected in series for each phase. Figure 2A Shown is the schematic diagram of its main circuit wiring, Figure 2B It is composed of the circuit of its power unit. The shown high-voltage frequency converter includes a main transformer 1 , 9 reactors (eg 2AU), 9 power units (eg 3AU), a main controller 4 and a sensor circuit 5 .
[0057] The main transformer 1 shown is a three-phase multi-secondary winding transformer, its primary winding 11 is connected to the three-phase high-voltage power grid 7, and all the secondary windings (such as 12AU) are used as a group, including the same three-way (such as 12AU / 12BV / 12CW) ), each secondary winding (such as 12AU / 12BV / 12CW) also includes three windings with ...
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