Large capacity cascade multi-phase multi-level power converter without transformer
A power converter and large-capacity technology, which is applied in the direction of conversion equipment, electrical components, and AC motor control for intermediate conversion to DC, can solve the problems of large volume, weight, and high cost, and achieve significant economic benefits and cost reduction. , the effect of volume reduction
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[0030] The circuit structure of the new multi-phase converter is as follows: the H-type PWM rectifier bridge and the inverter are connected back to back through the DC bus capacitor to form a basic power conversion unit (Figure 2). The input side of multiple basic power conversion units is connected to the power grid in a cascaded form (see image 3 ). Three same circuits can be connected to the three phases of the three-phase AC grid, and the connection method can be delta or star ( Figure 4~7 ).
[0031] The output level of the basic power conversion unit can be two levels or three levels, which depends on the needs of the overall design of the system. The number of bridge arms of the power conversion unit can be 2, 3, 5, or others, forming a single-phase, three-phase, five-phase or other phase inverter. Therefore, for a large-capacity drag system based on this topology, the number of power supply phases q and the number of motor phases m 1 , Phase number of power conve...
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