A Minimum Current Harmonic Pulse Width Modulation System Based on Stator Flux Linkage
A pulse width modulation, current harmonic technology, applied in torque ripple control, electrical components, output power conversion devices, etc., can solve the switching loss torque ripple optimization effect is limited, the current harmonic reduction effect is not large, etc. problems, to achieve the effect of improving motor control performance, reducing current stress, reducing current harmonics and torque ripple
Active Publication Date: 2021-06-08
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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[0004] Existing special synchronous modulation technologies such as over-modulation and intermediate 60-degree synchronous modulation can effectively reduce voltage harmonics, but have little effect on reducing current harmonics, and thus have limited optimization effects on switching loss and torque ripple
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[0030] refer to figure 1 , the traction system includes a traction inverter, a motor, etc., and the traction inverter includes a DC module, an inverter module, and a control unit. Iv), after internal processing and calculation, a PWM pulse signal (chopper control and inverter control) is sent out, and then the IGBT is turned on and off to realize chopper control and inverter control. The modulation system of the present invention is actually a part of the traction inverter control system (motor control system), mainly including an inverter module and a control unit, which can realize precise control of the motor under vehicle traction and braking conditions.
[0031] refer to figure 2 , is a multi-mode pulse width modulation control technology diagram commonly used in traction systems. The horizontal axis is the frequency of the motor stator (unit Hz), and the vertical axis is the IGBT switching frequency (unit Hz). Asynchronous modulation is used at low frequencies (the swi...
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A minimum current harmonic pulse width modulation system based on stator flux linkage, including an inverter module and a control unit, wherein the processor module of the control unit includes a signal filtering module, a modulation degree calculation module, a frequency and angle calculation module, a mode selection and Switching module, switching angle calculation module, selection and update module, and pulse generation module, through the connection of mode selection and switching module, switching angle calculation module and selection and update module, the switching loss of IGBT in the inverter module can be reduced, and the switching loss of the switch tube can be reduced. Current stress, thereby contributing to improved motor control performance; reducing current harmonics and torque ripple by selecting and updating the connection of modules to pulse production modules to minimize the overall harmonic components of the motor current.
Description
technical field [0001] The invention relates to a pulse width modulation control technology, in particular to a minimum current harmonic pulse width modulation control system. Background technique [0002] The subway is very important in urban rail transit, and the traction system of the subway vehicle is the key core component of the subway vehicle. The traction system of subway vehicles has high power, low switching frequency and wide speed operation range, which leads to large switching loss of IGBT in the system, high current harmonic content, large torque ripple and poor running stability. In order to make the subway vehicle traction system have low switching loss, low current harmonic content, small torque ripple, and smooth operation in the entire speed range, the traction system usually adopts multi-mode pulse width modulation control technology ( figure 2 Shown), used to reduce switching loss, reduce current harmonic content, reduce torque ripple, and improve contr...
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IPC IPC(8): H02M1/088H02M7/537H02P6/10
CPCH02M1/088H02M7/537H02P6/10
Inventor 康成伟张硕丛培城
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD