Multi-level frequency conversion driving apparatus with energy conservation unit

Abstract

The present invention belongs to the field of high voltage multilevel frequency conversion technology, characterized in that the main circuit composes of a H bridge series connection type frequency converter and a group of storage energy inverter devices. The H bridge series connection type frequency converter is powered by a multiple winding isolation transformer, the storage energy inverter device is connected with a passive power energy storage capacitor, the energy storage capacitor can be selected according to the corresponding system power level. The main switch device of the three-phase bridge arm of the frequency conversion driving device can choose the corresponding power semiconductor switch device according to the output voltage level and the different passing currents. The controller whose core is a high performance digital signal microprocessor forms the PWM control signal. The structure is added with a group of storage energy inverter devices in the base of the traditional H bridge series connection type frequency converter, so as to not only realize the purpose of using energy storage capacitor to store energy dynamically, but make the voltage harmonic content decrease, the present invention improves the efficiency and the performance of the frequency conversion driving device.

Description

technical field [0001] The invention relates to a power electronic multi-level topology structure, in particular to a topology of a multi-level frequency conversion speed regulating device with an energy storage unit. Background technique [0002] Energy shortage and environmental pollution are common century-old problems faced by mankind. my country's energy production and consumption ranks among the top in the world, but it is still far from meeting the needs of industrial production and the development of people's lives. At present, most of the high-voltage and large-capacity AC motors used in my country's industry are directly driven at a constant speed, which causes a lot of energy waste every year. If the frequency conversion speed regulation technology can be used to achieve variable speed operation, the energy saving effect will be obvious. Therefore, the development of high-performance and high-efficiency large-capacity AC motor frequency conversion speed regulatio...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to design a topology structure of a high-efficiency and energy-saving multi-level frequency conversion speed control device. Under the premise of the power supply, the increase in the number of output voltage levels can be realized, and the reliability of the system can also be improved. The frequency conversion device can be applied to the field of medium and high voltage speed regulation

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