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Pulse width modulation control of a matrix converter

A matrix converter and modulation function technology, which is applied in the direction of converting AC power input to AC power output, converting equipment to DC without intermediate conversion, converting device of output power, etc., which can solve the complex control algorithm and increase the system Cost, consumption of processor resources, etc.

Inactive Publication Date: 2010-03-17
OTIS ELEVATOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many of the control algorithms used to transform the input signal into a suitable output signal are very complex and consume a lot of processor resources
In addition, incorporating a matrix converter into a motor control system usually requires complex control hardware, which increases the cost of the system

Method used

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  • Pulse width modulation control of a matrix converter
  • Pulse width modulation control of a matrix converter
  • Pulse width modulation control of a matrix converter

Examples

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Embodiment Construction

[0013] figure 1 is a schematic view of a power system 10 that receives multi-phase alternating current (AC) power at an input frequency from a power source 12 and provides the multi-phase AC power to a load at an output frequency. Power system 10 includes LC filter 20 , matrix converter 22 and matrix converter (MxC) controller 24 . In the illustrated embodiment, the power supply 12 is a three-phase power supply (comprising input phases R, S, and T) that provides an input voltage v at the input of a matrix converter 22 1 , v 2 and v 3 and provides an input current i 1 i 2 and i 3 . Also in this illustrated embodiment, the matrix converter 22 supplies the induction motor 14 with an output voltage v 1 o , v 2 o and v 3 o and output current i 1 o i 2 o and i 3 o Three-phase electricity (including U, V and W phases).

[0014] LC filter 20 includes inductors 26a, 26b, and 26c, and capacitors 28a, 28b, and 28c. The inductor 26a is connected in series with the inpu...

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Abstract

A matrix converter includes a plurality of switching elements and is adapted to receive a multi-phase alternating current (AC) input signal having an input frequency and to generate a multi-phase AC output signal having an output frequency. The phases of the input signal are sorted as a function of their instantaneous voltage amplitude (60). A reference signal is generated from output reference voltages that correspond to each phase of the output signal (56). Duty cycles are calculated for each phase of the output signal based on the sorted input signal phases and the reference signal (62). Switching functions, which each control one of the switching elements, are then generated based on the duty cycles for each phase of the output signal (64, 66).

Description

【Technical field】 [0001] The present invention relates to power systems. More specifically, the present invention relates to a pulse width modulation control method for a matrix converter or a direct frequency converter. 【Background technique】 [0002] A matrix converter is an electronic device that converts an AC voltage of one frequency at its input to an AC voltage of a different frequency at its output. Matrix converters can also change the phase amplitude and number of phases between the input and output signals. A matrix converter includes a plurality of switching devices controlled by pulse width modulation (PWM) to provide voltages at the output of the matrix converter in a single-phase or multi-phase manner. The number of switching devices in a matrix converter is a function of the number of phases in the input and output lines. PWM changes the connection of switches between the input and output of the matrix converter so that the locally averaged output voltage ...

Claims

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Application Information

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IPC IPC(8): H02M5/297H02M5/27H02M5/275
CPCH02M5/271H02M5/297H02M5/275
Inventor V·布拉斯科
Owner OTIS ELEVATOR CO
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