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Clamping five level variable frequency driving device utilizing internal and external ring double-group rectifier bridge

A variable frequency drive, rectifier bridge technology, applied in the direction of AC motor control, electrical components, control systems, etc., to achieve the effect of reducing the number and reducing the cost

Inactive Publication Date: 2007-08-22
TSINGHUA UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to design a topology of an AC-DC-AC voltage type multi-level variable frequency speed control device. The present invention solves the problem of voltage balance of each floating capacitor on the DC bus of a diode-clamped five-level inverter , which realizes the stable and controllable output of the frequency conversion device in the full load range, and the frequency conversion device can be applied to the field of medium and high voltage speed regulation

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  • Clamping five level variable frequency driving device utilizing internal and external ring double-group rectifier bridge
  • Clamping five level variable frequency driving device utilizing internal and external ring double-group rectifier bridge
  • Clamping five level variable frequency driving device utilizing internal and external ring double-group rectifier bridge

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Embodiment Construction

[0034] The structure of the present invention is shown in Figure 4. Two groups of rectifier bridges are respectively connected to the DC bus and the internal floating capacitors to control the voltage balance of each capacitor on the bus, thereby controlling the diode-clamped five-level inverter in the whole Stable output over load range:

[0035] The two groups of rectifier bridges are referred to below as the outer ring rectifier bridge and the inner ring rectifier bridge respectively. Both the inner and outer ring rectifier bridges are uncontrollable rectifier bridges, and the output DC voltage ratio is 1:2, that is, it is assumed that the output of the outer ring rectifier bridge is voltage is V dc , then the output voltage of the inner ring rectifier bridge is V dc / 2, so that the inner ring capacitor voltage can be guaranteed to be 1 / 2 of the total bus voltage value, which is equivalent to reducing the degrees of freedom of the bus voltage in the original five-level str...

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Abstract

A clamp five level frequency conversion driving device with internal and external double-set of rectification bridge is prepared as forming master circuit by two sets of non-controllable rectification bridges and clamp five level inverter, selecting intermediate DC clamp capacity according system voltage level, using diode clamp five level structure as inverter and semiconductor switching component as master switch as well as using controller to generate PWM control signal by applying digital signal microprocessor as kernel.

Description

technical field [0001] The invention relates to a multi-level topology structure of power electronics, in particular to a topology of a five-level frequency conversion speed regulating device. Background technique [0002] The existing AC motors below 200kW in my country are low-voltage 380V, and the voltage levels of motors above 200kW are mostly 6kV and 10kV. Due to the limitation of the withstand voltage level and current carrying capacity of power devices, the conversion device of the traditional two-level inverter is difficult to meet the requirements of high-voltage and high-power electric energy conversion. In contrast, multilevel converters and related technologies have many significant advantages, and are considered by the industry to have broad application prospects in the field of high voltage and large capacity. Therefore, the study of high-voltage and large-capacity motor speed regulation technology has strategic significance for reducing energy consumption and...

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Application Information

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IPC IPC(8): H02P27/06H02P27/08
Inventor 李永东高跃饶建业
Owner TSINGHUA UNIV
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