Optimization and modulation method of duty ratios of five-bridge-arm voltage source inverter

A technology of voltage source inverter and modulation method, which is applied in the direction of motor generator control, control of electromechanical brake, electronic commutation motor control, etc.

Active Publication Date: 2014-02-19
TIANJIN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of voltage utilization rate and speed regulation range in the five-arm inverter driving two motor systems, and propose a duty-cycle optimization modulation method of the voltage source inverter to ensure that the common bridge arm can be Simult

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  • Optimization and modulation method of duty ratios of five-bridge-arm voltage source inverter
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  • Optimization and modulation method of duty ratios of five-bridge-arm voltage source inverter

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[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0030] The present invention is a new modulation strategy proposed for the five-arm inverter two-motor drive system, which can realize the independent decoupling control of the two motors, improve the dynamic and static performance of the two-motor system, and increase the DC bus voltage The utilization rate of the system expands the speed regulation range of the system.

[0031] The overall control block diagram of the system is as follows figure 1 shown. The current loop and the speed loop of the two motors respectively adopt the traditional PI controller, and the output of the controller is the reference value u of the d and q axis voltage of the two motors respectively. d1_ref , u q1_ref and u d2_ref , u q2_ref , after dq / αβ transformation, it is input to the space vector pulse width modulation (SVPWM) module, and the duty cycle of th...

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Abstract

The invention relates to the field of power converters of drive motors, in particular to an optimization and modulation method of duty ratios of a five-bridge-arm voltage source inverter. The method includes the steps that three-phase stator currents of two motors are converted into dq axial current components under a two-phase rotating coordinate system through abc coordinates and dq coordinates respectively; PI controllers are adopted in rotating speed loops and current loops; required duty ratio reference values of drive signals of the two motors are generated by using voltage reference values of direct current bus voltages under a two-phase static coordinate system and through space vector pulse width modulation; the duty ratios are optimized and modulated in each sampling period. By the adoption of the optimization and modulation method, it is guaranteed that a common bridge arm can control the two motors at the same time in the modulation period, the control decoupling problem of the two motors is solved, the time of the two motors for being controlled by zero voltage vectors is effectively shortened, the utilization rate of the direct current bus voltages is improved, and the speed regulating range of a system is expanded.

Description

Technical field [0001] The invention relates to the field of power converter control for driving motors, in particular to a modulation method for a five-bridge arm inverter driving two motor systems. Background technique [0002] In recent years, with economic transformation and industrial upgrading, industrial production such as rail transit, papermaking, textiles, and metallurgy urgently needs multi-motor high-performance coordinated control technology, and multi-motor drive and control technology has also become a research hotspot in the scientific research community. [0003] At present, for two three-phase motors, a dual voltage source inverter is usually required to control them, and the modulation strategy generally adopts space vector pulse width modulation. With the development of modern power electronics technology on multi-phase voltage source inverters, a new way has been opened up for the drive of multi-motors. Among them, the five-arm voltage source inverter (...

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Application Information

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IPC IPC(8): H02P5/74H02P21/00
Inventor 史婷娜张必军夏长亮
Owner TIANJIN UNIV
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