Multi-level frequency conversion driving apparatus with energy conservation unit

A technology of variable frequency drive and energy storage unit, which is applied in the direction of output power conversion device, AC motor control, electrical components, etc., to achieve the effects of reducing harmonics, improving performance, and increasing the number of levels

Inactive Publication Date: 2009-07-29
TSINGHUA UNIV
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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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  • Multi-level frequency conversion driving apparatus with energy conservation unit
  • Multi-level frequency conversion driving apparatus with energy conservation unit
  • Multi-level frequency conversion driving apparatus with energy conservation unit

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Embodiment Construction

[0045] To achieve the above object, the present invention adopts the following scheme:

[0046] The topology of the present invention consists of a multi-winding secondary phase-shifting isolation transformer, a plurality of two-level H-bridge power conversion units (hereinafter referred to as two-level H-bridge power units), a group of energy storage inverter devices and a full digital controller. See Figure 4a shown.

[0047] The multi-winding secondary phase-shifting isolation transformer (hereinafter referred to as phase-shifting isolation transformer), its secondary windings are multiple sets of three-phase windings, and the output line voltage phases of each three sets of windings are sequentially shifted through the same phase angle; each output three-phase The windings are connected to a two-level H-bridge power unit, and the outputs of the two-level H-bridge power units connected to the three-phase windings with different phase shifts are connected in series.

[00...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/04H02M7/527
Inventor 李永东饶建业
Owner TSINGHUA UNIV
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