High-voltage motor parallel connection chopping and double-inversion speed-governing energy-saving controller

Abstract

The invention discloses a high voltage motor parallel wave chopping and double inversion speed regulation energy-saving controller, which is applied to the stepless speed regulation of a wound rotor type motor loaded on blowers and pumps, and the like in the industries of electric power, cement and metallurgy, and the like. The controller comprises a parallel wave chopper and a double inverter, wherein, the parallel wave chopper comprises flat wave reactors L1 and L2, isolated gate bipolar transistors S1 and S2, fast recovery diodes D1 and D2, and capacitors C1 and C2; the double inverter comprises two independent inverters Q1 and Q2 and a double inversion three winding transformer T, the inverter Q1 comprises six thyristors Q11 to Q16 and a reactor L3, the inverter Q2 comprises six thyristors Q21 to Q26 and a reactor L4, the double inversion three winding transformer T is provided with three sets of windings, wherein, one set of the winding is arranged at the high voltage side and connected into Y-shape by three phases, two sets of the windings are arranged at the low voltage side, wherein, one set of the winding Tq1 is connected into the Y-shape by three phases, and the other setof the winding Tq2 is connected into triangular shape by three phases. The controller can guarantee that the current of the isolated gate bipolar transistors of the parallel loop of each path are basically consistent.

Description

(1) Technical field [0001] The invention relates to a high-voltage motor insulated gate bipolar transistor (IGBT) parallel chopper type double inverter speed regulation technology. Widely used in electric power, cement and metallurgical industries such as fans and pumps for stepless speed regulation of winding motors, especially suitable for speed regulation technical transformation projects of winding motors. It belongs to the field of electromechanical technology. (2) Background technology [0002] Fans and water pumps are widely used, and their annual electricity consumption accounts for about 43% of the total electricity consumption. At present, most of this kind of equipment cannot be adjusted in speed, and only valves or windshields can be used to adjust the flow to meet the requirements of load changes. In the low-voltage system, the frequency conversion speed regulation technology is quite mature, which can fully meet the needs of the domestic speed regulation mark...

AI Technical Summary

Problems solved by technology

[0007] The first purpose of the present invention is to overcome the current sharing problem when IGBTs are connected in parallel in the original cascaded speed regulation circuit, and provide a high-voltage motor that can ensure that the currents of IGBTs in each parallel circuit are basically the same Parallel chopper and double inverter speed regulation energy-saving controller

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