Control Method of Energy Feedback Elevator Traction Drive System Based on Matrix Converter

Abstract

The present invention discloses an energy feedback elevator traction driving system control method based on a matrix converter. Based on the power balance active damping inhibition resonance method and a model prediction control method, according to the motor side power requirement, the power grid side reference input current is obtained, current high-frequency components corresponding to the high-frequency components in the input voltage are added into the reference input current to obtain the active damping control of the grid-connected current with high sine degree, the interlace control advantage of a two-channel circuit itself is added to effectively inhibit the grid-connected current harmonic wave and improve the input current sine degree. The model prediction control is performed at the motor side to derive and establish the mathematical model of the system and take two-channel three-level permanent magnet motor torque and linkage as control objects, the required variable is subjected to sampling according to the system requirement to predict the value of the next moment under all the actions of all the switch states, and a value function through human construction is employed to select a switch state which is the most suitable for the requirement so as to allow the system to obtain superior input / output performances.

Description

technical field [0001] The invention relates to a high-performance control method for an energy feedback type multi-phase elevator traction drive system based on a matrix converter, and belongs to the technical fields of electrician, motor and power electronics. Background technique [0002] At present, the energy saving and consumption reduction of elevators has attracted great attention of the industry. The dv / dt of the traditional elevator drive system based on the two-level inverter is large, resulting in a large common-mode voltage of the elevator motor, a poor voltage output waveform, and a large harmonic distortion rate. The rectification method is not controlled, so the drive system only has one-way power transmission capability, and the energy of the motor cannot be fed back to the grid during the deceleration and braking process of the elevator, but is wasted through energy-consuming components such as resistors. In the practical application of elevator energy sav...

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Problems solved by technology

[0003] Energy feedback multi-phase elevator traction drive system based on matrix converter, multi-level inverter has the advantages of high equivalent switching frequency, small dv / dt, good output waveform, and small harmonic content, but the indirect The grid-connected current of the matrix converter has harmonics of the resonant frequency of the LC filter, which will undoubtedly cause harmonic pollution to the power grid, affect the quality of power supply, and cause serious harm to the power system and users. Suppressing this resonance is an indirect matrix converter Preconditions for commissioning

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