Neutral-point voltage control system and method for parameter on-line tuning
A technology of DC bus voltage and DC bus midpoint, which is applied in the field of midpoint voltage control system, can solve problems such as midpoint voltage fluctuation, achieve the effects of reducing output voltage, improving output waveform quality, and facilitating digital realization
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[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0036] The mid-point voltage control system and method for parameter online setting of the present invention collects the DC bus voltage and the mid-point voltage signal of the DC bus in real time to obtain the three-phase reference phase voltage V through the PI controller. a , V b , V cThe adjustment amount; the new three-phase reference phase voltage V after superimposing the adjustment amount a ', V b ', V c 'After the SVPWM vector control operation, the pulse width modulation control signal capable of suppressing the midpoint voltage DC bias and the midpoint voltage fluctuation is obtained, so as to realize the balanced control of the midpoint voltage.
[0037] combine figure 1 , the mid-point voltage control system for parameter online tuning of the present invention includes a three-level inverter and a digital processing ...
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